Texas Instruments ADS1261EVM, ADS1235EVM User Manual

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User's Guide

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ADS1261 and ADS1235 Evaluation Module

ADS1261, ADS1235 Evaluation Module (ADS1261EVM Shown)

The ADS1261EVM and ADS1235EVM are evaluation module kits providing hardware and software support for evaluation of the ADS1261, or ADS1235, delta-sigma analog-to-digital converter (ADC). The kit utilizes the TM4C1294NCPDT processor to communicate with the ADC via SPI and provide communication with a PC over USB interface. The kit also includes a software application that runs on a PC allowing for register manipulation and data collection from the ADC. The ADS1261 and ADS1235 EVM kit include the ADS12xx device along with a USB micro cable and downloadable supporting software (SW).

This document includes a detailed description of the hardware (HW), software, bill of materials, and schematic for the EVM.

Throughout this document, the term EVM is synonymous with ADS1261EVM and ADS1235EVM, demonstration kit, and evaluation module. The term EVM applies to both the ADS1261EVM and ADS1235EVM. The term GUI is synonymous with Delta-Sigma ADC EvaluaTIon Software, core application, and EVM software. The use of Tiva™ is synonymous with the TM4C1294NCPDT microcontroller.

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Table 1. Related Documentation

Device Literature Number

ADS1261 SBAS760 ADS1235 SBAS824

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Contents

1 EVM Overview ............................................................................................................... 3

1.1 Description........................................................................................................... 3

1.2 Requirements ....................................................................................................... 3

1.3 Software Reference ................................................................................................ 3

1.4 Supported Functionality............................................................................................ 3

2 Quick Start.................................................................................................................... 4

2.1 Default Jumper and Switch Configuration ....................................................................... 4

2.2 Powering the EVM.................................................................................................. 4

2.3 Software Installation and Hardware Connection Procedure .................................................. 5

3 Hardware Reference ........................................................................................................ 6

3.1 Jumper and Switch Configuration Reference ................................................................... 6

3.2 Header, Connector, and Test Point Reference ................................................................. 7

4 Software Details ............................................................................................................ 11

4.1 Installing the Software ............................................................................................ 11

4.2 Connecting to the EVM Hardware .............................................................................. 13

4.3 Using the Software With the EVM .............................................................................. 13

5 EVM Bill of Materials, PCB Layouts, and Schematics................................................................. 15

5.1 Bill of Materials .................................................................................................... 15

5.2 PCB Layouts....................................................................................................... 20

5.3 Schematic .......................................................................................................... 22

List of Figures

1 Default Configurations for ADS1261 and ADS1235 EVM.............................................................. 4

2 Input Terminal Blocks ....................................................................................................... 7

3 Delta-Sigma Evaluation Engine Installation Instructions .............................................................. 11

4 Device Package Installation Instructions................................................................................ 12

5 GUI View Before Connecting ............................................................................................. 13

6 GUI View After Connecting EVM......................................................................................... 13

7 Top Silkscreen.............................................................................................................. 20

8 Top Layer (Positive) ....................................................................................................... 20

9 Ground Layer (Negative).................................................................................................. 20

10 Power Layer (Negative) ................................................................................................... 21

11 Bottom Layer (Positive).................................................................................................... 21

12 Bottom Silkscreen.......................................................................................................... 21

13 ADS1261EVM Block Diagram Schematic .............................................................................. 22

14 ADS1261EVM Analog Inputs Schematic................................................................................ 23

15 ADS1261EVM ADC Main Schematic.................................................................................... 24

16 ADS1261EVM Digital Header Schematic ............................................................................... 25

17 ADS1261EVM USB and Peripherals Schematic....................................................................... 26

18 ADS1261EVM Processor Main Schematic ............................................................................. 27

19 ADS1261EVM USB Power Schematic .................................................................................. 28

20 ADS1261EVM External Power Schematic.............................................................................. 29

Trademarks

Tiva is a trademark of Texas Instruments, Incorporated. Microsoft, Windows are registered trademarks of Microsoft Corporation. All other trademarks are the property of their respective owners.

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1 EVM Overview

1.1 Description

This user guide describes the operation and use of the ADS1261 and ADS1235 evaluation module. The EVM platform is intended for evaluating the ADS1261 or ADS1235 performance and functionality.

1.2 Requirements

1.2.1 Software Requirements

PC with Microsoft®Windows®7 or higher operating system.

1.2.2 Hardware Requirements

PC with available USB 2.0 or greater connection.

1.2.2.1 Power Supply

USB powered.

1.3 Software Reference

For the core software documentation, see the Delta-Sigma ADC EvaluaTIon Software User Manual or navigate to the File -> About option from within the GUI, then click on the Software user guide icon.

EVM Overview

1.4 Supported Functionality

1.4.1 Hardware Functionality

The EVM features the following hardware capabilities:

• 5-V unipolar or bipolar AVDD and AVSS supply operation

• Unipolar (5 V) and bipolar (±2.5 V) AVDD and AVSS supply operation

• 3.3-V DVDD

• Digital header for external processor or controller configuration

• Configurable for direct sensor inputs

• Onboard or external ADC clock operation

• Onboard (not installed) or external ADC voltage reference

• Fault LED for STATUS or CRC error notification

1.4.2 Software Functionality

The EVM features the following software functions:

• Device conversion control

• Device software reset

• Device power down

• Register read and write

• Conversion result readback

• Self offset and system input calibration

• Error detection through device status information

• CRC of data and SPI communication (for error prevention or detection of data transmission)

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Quick Start

2 Quick Start

This section provides a guide to quickly begin using the EVM.

2.1 Default Jumper and Switch Configuration

The EVM is configured with the settings listed in Table 2 and illustrated in Figure 1.

Table 2. Default Settings

Jumper Position Function

JP1 (Not Installed) Use onboard processor JP2 (Not Installed) USB-derived supplies ON JP3 (Not Installed) DVDD from USB power (1-2 connection via R94) JP4 (Not Installed) AVDD from USB power (1-2 connection via R95) JP5 (Not Installed) N/A

Jumper Position Function

S1 Right Unipolar analog supply (AVDD = 5 V, AVSS = 0 V)

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Figure 1. Default Configurations for ADS1261 and ADS1235 EVM

2.2 Powering the EVM

The EVM is powered through the USB interface with the PC. Follow the installation and connection procedure in Section 2.3 before connecting the EVM to the PC. Sections Section 2.2.1 and Section 2.2.2 provide additional details about the analog and digital power supply configurations of the ADC.

2.2.1 Analog Supply Configuration of the ADC'

The ADS1261 (or ADS1235) analog supply requires a 5-V source connected between the AVDD and AVSS pins. The EVM provides onboard 5-V, 2.5-V and –2.5-V supply rails to allow for both unipolar and bipolar supply polarities, respectively. The analog supply polarity can be selected by S1. When switching S1, TI recommends disconnecting the USB cable from the EVM, toggling the switch, and then reconnecting the USB cable.

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Use R33 to measure the AVDD supply current, by measuring the voltage drop across this resistor or by removing the resistor and connecting a dc current meter between the "A+" and "A–" test points.

2.2.2 Digital Supply Configuration of the ADC

The ADS1261 (or ADS1235) digital supply requires a 2.7- to 5.25-V source connected between DVDD and DGND. The EVM provides a (typical) 3.3-V onboard digital supply for the digital supply of the ADC.

R38 can be use to measure the DVDD supply current, by measuring the voltage drop across this resistor or by removing the resistor and connecting a dc current meter between the "D+" and "D–" test points.

2.3 Software Installation and Hardware Connection Procedure

Use the following steps at startup:

1. Install the GUI software on the PC.

2. Install the device package software on the PC. (ADS1261 Device Package for the ADS1261EVM and ADS1235 Device Package for the ADS1235EVM.)

3. Ensure all jumpers and switches are configured in the default configuration per Table 2 and Figure 1.

4. Connect the EVM to the PC using a USB cable to power the board.

5. If prompted, install any required drivers.

6. Start the GUI application on your PC. The GUI should automatically detect the connected EVM.

NOTE: After powering the EVM, the green D2, D3, and “+5V” LEDS will be lit.

Quick Start

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Hardware Reference

3 Hardware Reference

3.1 Jumper and Switch Configuration Reference

Table 3 provides all jumper and switch configuration settings for the EVM.

Table 3. Jumper and Switch Options

Jumper Position Description

JP1 Operation of EVM with external digital signals

Installed (ON) Hold Tiva processor (U9) in reset and disable level shifters to allow external digital

Uninstalled (OFF) Normal operation with onboard Tiva processor (default)

JP2 Power down USB power supplies

Installed (ON) USB-derived power supplies disabled and powered down Uninstalled (OFF) USB-derived power supplies enabled and ON (default)

JP3 Digital supply source

1–2 shorted Digital supply (U19) powered from USB power (default using R94 as the short) 2–3 shorted Digital supply (U19) powered from external supply source Open No digital system power provided

JP4 5-V supply source

Installed (ON) 5-V supply powered from USB (default using R95 as the short) Uninstalled (OFF) No analog supply powering AVDD

JP5 EXT_5V supply power down

Installed (ON) External supply regulator (U18-not installed) disabled Uninstalled (OFF) External supply regulator (U18-not installed) enabled (default)

Switch Position Description

(1)

S2 Tiva reset (U1 RST) button

S3 Reset FAULT button

S4 BSL button for Device Firmware Update (DFU) mode

(1)

Switch is DPDT. Pin 1 is identified with a dot on the PCB silkscreen.

AVDD and AVSS supply polarity switch Right (pin connections:

5–6, 2–3) Left (pin connections: 5–4,

2–1)

Closed (depressed) Tiva held in RESET, level shifters (U6, U7, and U8) tri-stated Open (normally) Normal operation

Closed (depressed) Clears FAULT indicator and writes 0x00 to the STATUS register of the ADC Open (normally) Normal operation

Closed (depressed on RESET)

Open (normally) Normal operation

signals

Unipolar supply (AVDD = 5 V, AVSS = GND) (default)

Bipolar supply (AVDD = 2.55 V, AVSS = –2.5 V)

Total Tiva FLASH erasure (on reset Tiva enumerates as a DFU device)

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Pin 1 Pin 2

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

Pin 7

Pin 8

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3.2 Header, Connector, and Test Point Reference

This section provides the connection information and details for all of the connectors and test points utilized on the EVM.

3.2.1 Analog Input Terminal Blocks

Analog input to the EVM can be connected at the terminal blocks located on the left side of the board (see

Figure 2) to provide external analog signal input to the EVM for evaluation purposes. The functions for

these terminal blocks are listed in Table 4. At no time should a voltage be applied that exceeds the absolute maximum ratings for the input of the ADS1261 or ADS1235.

Hardware Reference

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Figure 2. Input Terminal Blocks

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Table 4. Analog Input Terminal Blocks, J1–J4

Pin Function Test Point ADS1261 Input Pin ADS1235 Input Pin

(1)

1 (ADS1261EVM) Analog input 2 (ADS1261EVM) Analog input

1 Analog input 2 Analog input 3 Analog input 4 Analog input 5 Analog input 6 Analog input 7 Analog input 8 Analog input

(2)

1 (ADS1261EVM) Analog input 2 (ADS1261EVM) Reference output – REFOUT –

1 GND – DGND DGND 2 AVSS – AVSS AVSS

(1)

J1 and J3 are not populated on the ADS1235EVM.

(2)

Analog inputs are pinned out to terminal blocks through RC filters. Refer to Figure 14 for additional connection details.

(2)

A9 AIN9 – A8 AIN8 –

A7 AIN7 AIN5 A6 AIN6 AIN4 A5 AIN5 AIN3 A4 AIN4 AIN2 A3 AIN3 AIN1 A2 AIN2 AIN0 A1 AIN1 REFN0 A0 AIN0 REFP0

(1)

(2)

A10 AINCOM –

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3.2.2 External Clock

By default, a clock is supplied by the internal oscillator of the ADC when the CLKIN pin is pulled low. However, the EVM also provides the capability to connect an external clock directly to the ADC using the J6 connector (see Figure 16.) When connecting to J6, a direct connection can be made between pins 42 (CLKIN) and 40 (GND). A typical clock source of 7.3728 MHz (or 10.24 MHz for 40 kSPS mode, on the ADS1261) will track with all timing shown in ADS126x Precision, 5-Channel and 10-Channel, 40-kSPS,

24-Bit, Delta-Sigma ADCs With PGA and Voltage Reference or ADS1235 High-Resolution, 24-Bit, 7200SPS, Delta-Sigma, Analog-to-Digital Converter With Programmable Gain Amplifier for Bridge Sensors.

NOTE: The CLKIN pin connects to the Tiva microcontroller. The microcontroller holds the CLKIN pin

low in order to enable the internal oscillator of the ADC. Before applying an external clock, be sure to disable the GPIO output on this pin by sending the "HOLDCLOCK 0" command, described in Table 7.

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3.2.3 Digital Interface Header

Table 5 lists the functions and pin numbers for all signals used on the digital interface.

Function ADC Side Processor Side

External voltage input GND 56 55 EXT_5V Bank3 level-shifter voltage DVDD 54 53 LVDD1 GPIO for ADC FAULT_LED 52 51 PD7

Bank2 level-shifter voltage DVDD 36 35 LVDD2 ADC GPIO ADC_nPWDN 34 33 PA0 SPI0 ADC_nDRDY 32 31 PA1

ADC GPIOs ADC_START 22 21 PA6

Bank1 level-shifter voltage DVDD 18 17 LVDD3 (Unused)

(1)

Even-numbered pins not included in this list are connected to GND.

(2)

Odd-numbered pins not included are connected to the Tiva microcontroller (after passing through level shifters) but the functionality is not used for this EVM. For connection details, see Figure 16.

(3)

Signals connected to the Tiva microcontroller are named according to their respective processor pin connections. For connection details, see Figure 16.

Hardware Reference

Table 5. Digital Interface, J6

Signal Name Pin Number

(1)

Pin Number

EXT_CLK 42 41 PD3 (Unused)

ADC_SCLK 30 29 PA2 (SSI0CLK) ADC_nCS 28 27 PA3 ADC_MOSI (DIN) 26 25 PA4 (SSI0XDAT0) ADC_MISO (DOUT) 24 23 PA5 (SSI0XDAT1)

ADC_nRESET 20 19 PA7

(2)

Signal Name , Tiva Connection

(3)

3.2.4 Test Points

The test points listed in Table 6 may be used to probe onboard voltage supplies and signals.

Function Signal Name Restrictions

Analog input (ADS1261EVM: AIN9) A9 Probe only Analog input (ADS1261EVM: AIN8) A8 Probe only Analog input (ADS1261EVM: AIN7, ADS1235EVM: AIN5) A7 Probe only Analog input (ADS1261EVM: AIN6, ADS1235EVM: AIN4) A6 Probe only Analog input (ADS1261EVM: AIN5, ADS1235EVM: AIN3) A5 Probe only Analog input (ADS1261EVM: AIN4, ADS1235EVM: AIN2) A4 Probe only Analog input (ADS1261EVM: AIN3, ADS1235EVM: AIN1) A3 Probe only Analog input (ADS1261EVM: AIN2, ADS1235EVM: AIN0) A2 Probe only Analog input (ADS1261EVM: AIN1, ADS1235EVM: REFN0) A1 Probe only Analog input (ADS1261EVM: AIN0, ADS1235EVM, REFP0) A0 Probe only Analog input (ADS1261EVM: AINCOM) A10 Probe only External Bridge Supply (EXC+ positive supply) AVDD/EXC+ Remove R6 before connecting to an external

External Bridge Supply (AVSS "ground" reference) AVDD For external supply ground reference only. Do

External Bridge Supply (EXC– negative supply) AVSS/EXC– Remove R25 before connecting to external

Table 6. Useful Test Points

ADC side

supply, consider the common mode voltage of

the ADC when selecting EXC+ voltage

not apply a voltage to this testpoint.

supply, consider the common mode voltage of

the ADC when selecting EXC– voltage

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Function Signal Name Restrictions

External reference source VIN U2–1 (VIN) Remove R27 before connecting to external

Analog supply of the ADC (useful for current measurement) AVDD (A+) Probe only Analog supply of the ADC (useful for current measurement) U3–4 (A–) Probe only Digital supply of the ADC (useful for current measurement) DVDD (D+) Probe only Digital supply of the ADC (useful for current measurement) U3–17 (D–) Probe only 5-V supply +5V Probe only

3.3-V supply +3.3V Probe only

2.5-V supply +2.5V Probe only Ground GND Probe only –2.5-V supply –2.5V Probe only

USB-sourced supply USB_VBUS

USB sourced supply USB_VBUSP

5.5-V output (U15) USB_BOOST

1.8-V output (U17) +1.8V Probe only

5.0-V output (U16) +5V Probe only Ground GND Probe only

3.3-V output (U19) +3.3V Probe only Step-up dc/dc converter output (U23 - not populated) HVBoost Probe only High-voltage linear regulator output (U24 - not populated) +HVDD Probe only Inverting dc/dc converter output (U25 - not populated) HVInvert Probe only Negative high-voltage linear regulator (U26 - not populated) –HVSS Probe only

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Table 6. Useful Test Points (continued)

supply. Reference external supply source to

AVSS. Do not violate absolute maximum

ratings of U2.

Processor Side

Probe only

(VBUS+)

Probe only

(VBUS–)

Probe only

(+5.5V)

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4 Software Details

4.1 Installing the Software

4.1.1 Delta-Sigma ADC EvaluaTIon Software

Download the Delta-Sigma ADC EvaluaTIon Software installer from the DELTASIGMAEVAL-GUI page and save to a known folder. Run the installer and follow the on-screen prompts. Note that future software versions may show slightly different screens.

Software Details

Figure 3. Delta-Sigma Evaluation Engine Installation Instructions

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STEP 3 STEP 4

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Software Details

4.1.2 ADS1261 and ADS1235 EVM Device Package

Download the ADS1261 Device Package installer from the ADS1261EVM tool page for the ADS1261EVM (or the ADS1235 Device Package installer from the ADS1235EVM tool page for the ADS1235EVM) and save it to a known folder. Run the appropriate device package installer and follow the on-screen prompts. Note that future software versions may show slightly different screens.

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Figure 4. Device Package Installation Instructions

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4.2 Connecting to the EVM Hardware

After the Delta-Sigma ADC EvaluaTIon Software and the ADS1261 Device Package (or ADS1235 Device Package) are installed, connect the hardware with the provided USB micro cable, and start the DeltaSigma ADC EvaluaTIon Software. The GUI automatically detects the connected hardware and displays the device register map under the Device tab as Figure 5 and Figure 6 show.

Figure 5. GUI View Before Connecting Figure 6. GUI View After Connecting EVM

Software Details

4.3 Using the Software With the EVM

The Delta-Sigma ADC EvaluaTIon Software User Manual provides an overview of the GUI, an explanation of how to modify device register settings, how to collect and analyze data, and control device operations with scripts. For a list of commands that are supported on the ADS1261 and ADS1235 EVM, see

ADS1261 and ADS1235 EVM Commands.

4.3.1 ADS1261 and ADS1235 EVM Commands

The EVM commands are given in Table 7. These commands are available for use within the Scripts and Console tabs of the Delta-Sigma ADC EvaluaTIon software. Many of these commands are SPI commands

that are defined in the device data sheet. All other command functions are provided by the EVM firmware. In general, most device commands that communicate with the ADC via SPI will require the /PWDN pin to

be set high, prior to issuing the command. When the /PWDN pin is low, the device is in hardware powerdown mode and all device functions are disabled (only the internal LDO remains powered). Returning the /PWDN pin resumes normal ADC operations and preserves the registers settings.

The ADC may also be placed into a software power-down mode by setting the PWDN bit high, in the MODE3 register. In this mode the internal LDO, internal reference, and serial interface remain enabled. SPI commands can be sent while the device is in software power-down mode; however, these actions may or may not take effect in this mode.

Note that some of the commands shown in Table 7 may wake the ADC prior to taking effect, particularly for EVM commands that are utilized by the GUI. Refer to the "Wakes Device?" column in Table 7 to determine the intended behavior of the EVM firmware.

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Table 7. ADS1261 and ADS1235 EVM Software Commands 1

Command

COMMANDLIST Returns a list of all commands supported by the EVM firmware. N

COLLECT <# Samples>

REGMAP This command is used by the GUI to read the values of all registers. Y

NOP Issues the NOP device command to the ADC (via SPI). N RESET Issues the RESET device command to the ADC (via SPI). N START Sets the START pin low and issues the START device command to the ADC (via SPI). N

STOP Sets the START pin low and issues the STOP device command to the ADC (via SPI). N

RDATA Starts a single conversion, waits for /DRDY to go low, and prints the conversion result to the console. N

SYOCAL Issues the system-offset calibration device command to the ADC (via SPI). N SYGCAL Issues the system-gain calibration device command to the ADC (via SPI). N SFOCAL Issues the self-offset calibration device command to the ADC (via SPI). N

RREG <ADDRESS>

READSINGLE <ADDRESS>

HOLDCLOCK <"0" or "1">

WREG

WRITESINGLE

LOCK

UNLOCK

HOLDPWDN <"0" or "1">

HOLDSTART <"0" or "1">

HWRESET This command toggles the /RESET GPIO pin. N

CLEAR

STATUS

CRC

DONTCARE <VALUE>

SPISEND

(1)

Returns device to previous state after completion.

(2)

Resetting will wake the device from software-power down mode.

(3)

Setting the /PDWN pin high exits hardware power-down mode; however, the previous software power-down mode will remain unchanged.

Command

Arguments

<DATA>

<DATA>

<BYTE1>

<BYTE2> ...

Description

Returns EVM ID string: "<DEVICE> <DATE> <TIME>", where "<DEVICE>" is either "ADS1261" or "ADS1235", and "<DATE> <TIME>" indicates when the EVM firmware was complied.

Collects a number of ADC samples equal to "<# Samples>", where "<# Samples>" is an unsigned integer. During this operation, all other commands will be ignored and the BUSY LED will blink until all samples have been collected.

Issues a read register device command to the ADC (via SPI), where "<ADDRESS>" is the starting register address in hexadecimal (without the "0x" prefix or "h" postfix).

This command is used by the GUI. It provides the same function as RREG, but wakes the device from power down and returns to previous power-down mode after completion.

This command disables the Tiva GPIO output connected to "EXT CLK" to allow for external clocks to be applied to J6. Refer to Section 3.2.2.

Issues a write register device command to the ADC (via SPI), where "<ADDRESS>" is the starting register address in hex, and "<DATA>" is the value to write to the register in hex (without the "0x" prefix or "h" postfix).

This command is used by the GUI. It provides the same function as WREG, but wakes the device from power down and returns to previous power-down mode after completion.

Sends the lock register device command to the ADC (via SPI). While in this mode, all write register commands will be ignored until the device is unlocked.

Sends the unlock register device command to the ADC (via SPI). This command unlocks the device register to allow write commands to take effect.

This command controls the state of the /PWDN GPIO pin. An argument of "1" sets the /PWDN pin high, while a "0" argument sets the /PWDN pin low.

This command controls the state of the START GPIO pin. An argument of "1" sets the START pin high, while a "0" argument sets the START pin low.

Clears the software fault flag, writes "0x00" to the STATS register (to clear the CRC_ERR and RESET bits), and turns off the FAULT LED. NOTE: Pressing S3 will perform the same action as the CLEAR command.

Reads the STATUS register (to check for any new fault conditions) and prints (to the console) a description of each fault type that has occurred since last clearing the software fault flag (with S3 or the CLEAR command).

Computes the CRC-n of the data bytes given in "<DATA1>" through "<DATA4>", where "<LENGTH>" is the number of bytes to be used in the CRC-n calculation. If the number of data bytes provided is greater than "<LENGTH>", the extra data bytes will be ignored.

Sets the "Don't care" byte value that is used for all SPI commands that include a "Don't care" byte. Changing the value of this byte only has the effect of modifying the resulting CRC byte that is used with CRC-mode.

Sends a user-specified SPI command sequence to the ADC. /CS will remain low until all bytes have been sent. After issuing this command the firmware will read the STATUS register to check for an CRC errors. This command allows for testing of the CRC command validation of the ADC, for example, since it allows the user to provide invalid CRC bytes with the various SPI commands.

Wakes

Device?

(1)

(2)

(1)

(3)

(2)

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EVM Bill of Materials, PCB Layouts, and Schematics

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5 EVM Bill of Materials, PCB Layouts, and Schematics

The bill of materials and schematics are shown for the ADS1261EVM only. The main difference between the ADS1261EVM and the ADS1235EVM is with respect to which device is populated, as well as additional components which are not installed on the ADS1235EVM. Components that are not populated on the ADS1235EVM are noted in Table 8.

5.1 Bill of Materials

NOTE: All components should be compliant with the European Union Restriction on Use of Hazardous Substances (RoHS) directive. Some part

numbers may be either leaded or RoHS. Verify that purchased components are RoHS-compliant. (For more information about TI's position on RoHS compliance, see http://www.ti.com.)

Table 8. EVM Bill of Materials

Designator Qty Value Description Package Reference Part Number Manufacturer

!PCB1 1 Printed Circuit Board PA044 Any C1, C3, C4, C6, C7, C9, C10,

C12, C15, C17

10 1000pF CAP, CERM, 1000 pF, 50 V, ±10%, C0G/NP0, 0603 0603 06035A102KAT2A AVX

C2, C5, C8, C11, C16, C18 6 0.01uF CAP, CERM, 0.01 uF, 25 V, ±5%, C0G/NP0, 0603 0603 CL10C103JA8NNNC Samsung Electro-

Mechanics C13, C35, C36 3 2.2uF CAP, CERM, 2.2 uF, 10 V, ±10%, X7R, 0603 0603 LMK107B7225KA-T Taiyo Yuden C14 1 220pF CAP, CERM, 220 pF, 50 V, ±5%, C0G/NP0, 0603 0603 06035A221JAT2A AVX C22, C24, C25, C27, C31, C37,

C38, C39, C40, C43, C44, C48, C49, C50, C51, C52, C53, C54, C59, C60, C61, C62, C63, C65, C67, C72, C78

27 0.1uF CAP, CERM, 0.1 uF,50 V, ±5%, X7R, 0603 0603 C0603C104J5RACTU Kemet

C28 1 4700pF CAP, CERM, 4700 pF, 100 V, ±5%, C0G/NP0, 0603 0603 C0603C472J1GAC7867 Kemet C29 1 10uF CAP, CERM, 10 uF, 10 V, ±10%, X7R, 0805 0805 CL21B106KPQNFNE Samsung Electro-

Mechanics C32, C34 2 4.7uF CAP, CERM, 4.7 uF, 25 V, ±10%, X7R, 0805 0805 C2012X7R1E475K125AB TDK C23, C26, C30, C33, C58, C74,

C75, C76, C79, C80

10 1uF CAP, CERM, 1 uF, 50 V, ±10%, X7R, 0603 0603 UMK107AB7105KA-T Taiyo Yuden

C45, C46 2 12pF CAP, CERM, 12 pF, 50 V, ±5%, C0G/NP0, 0603 0603 C0603C120J5GACTU Kemet C47, C57 2 2.2uF CAP, CERM, 2.2 uF, 35 V, ±10%, X5R, 0603 0603 GRM188R6YA225KA12D Murata C55, C56 2 6.8pF CAP, CERM, 6.8 pF, 50 V, ±4%, C0G/NP0, 0603 0603 06035A6R8CAT2A AVX C68 1 4.7uF CAP, CERM, 4.7 uF, 50 V, ±10%, X7R, 1206 1206 UMK316AB7475KL-T Taiyo Yuden C69 1 100pF CAP, CERM, 100 pF, 50 V, ±5%, C0G/NP0, 0603 0603 C0603C101J5GACTU Kemet C70 1 22uF CAP, CERM, 22 uF, 16 V, ±10%, X7R, 1210 1210 GRM32ER71C226KE18L Murata C71 1 10uF CAP, CERM, 10 uF, 35 V, ±10%, X7R, 1206 1206 GMK316AB7106KL Taiyo Yuden C73 1 47uF CAP, CERM, 47 uF, 10 V, ±20%, X5R, 1206 1206 LMK316BJ476ML-T Taiyo Yuden C77, C81 2 1000pF CAP, CERM, 1000 pF, 100 V, ±5%, X7R, 0603 0603 06031C102JAT2A AVX D1 1 Orange LED, Orange, SMD LED_0603 LTST-C191KFKT Lite-On

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Table 8. EVM Bill of Materials (continued)

Designator Qty Value Description Package Reference Part Number Manufacturer

(1)

Component is not populated on the ADS1235EVM.

D2, D3, D5 3 Green LED, Green, SMD LED_0603 LTST-C191TGKT Lite-On D4 1 Red LED, Red, SMD LED_0603 LTST-C191KRKT Lite-On H1, H2, H3, H4 4 Bumpon, Cylindrical, 0.312 X 0.200, Black Black Bumpon SJ61A1 3M J1

(1)

, J3

(1)

, J4, J5 4 Terminal Block, 3.5mm Pitch, 2x1, TH 7.0x8.2x6.5mm ED555/2DS On-Shore Technology

J2 1 Terminal Block, 3.5mm, 8-Pos, TH Terminal Block, 3.5mm, 8-Pos,THED555/8DS On-Shore Technology

J8 1 Connector, Receptacle, Micro-USB Type B, R/A, Bottom Mount

SMT

7.5x2.45x5mm 473460001 Molex

L1 1 1uH Inductor, Wirewound, Ferrite, 1 uH, 2.05 A, 0.054 ohm, SMD 1210 LQH32PH1R0NN0L Murata R1, R2, R3, R4, R5, R7, R10,

R15, R18, R24, R26, R63, R72, R74

14 100 RES, 100, 1%, 0.1 W, 0603 0603 RC0603FR-07100RL Yageo America

R6, R25 2 0 RES, 0, 5%, 0.25 W, 1206 1206 RC1206JR-070RL R9, R12, R14, R17, R19, R23,

R49, R52, R65, R87, R90, R94, R95

13 0 RES, 0, 5%, 0.1 W, 0603 0603 RC0603JR-070RL Yageo America

R21, R22, R34, R35, R36, R37, R48, R57, R58, R84

10 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America

R33, R38, R82 3 0.1 RES, 0.1, 1%, 0.1 W, 0603 0603 ERJ-L03KF10CV Panasonic R39, R40, R41, R42, R43, R44,

R45, R46, R47

9 47 RES, 47, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060347R0JNEA Vishay-Dale

R50 1 1.69k RES, 1.69 k, 1%, 0.1 W, 0603 0603 RC0603FR-071K69L Yageo America R53 1 604k RES, 604 k, 0.5%, 0.1 W, 0603 0603 RT0603DRE07604KL Yageo America R54 1 549k RES, 549 k, 1%, 0.1 W, 0603 0603 RC0603FR-07549KL Yageo America R55 1 511k RES, 511 k, 0.5%, 0.1 W, 0603 0603 RT0603DRE07511KL Yageo America R56 1 536k RES, 536 k, 1%, 0.1 W, 0603 0603 RC0603FR-07536KL Yageo America R60, R67, R70, R71, R73 5 10.0k RES, 10.0 k, 5%, 0.1 W, 0603 0603 RC0603JR-0710KL Yageo America R61 1 1.0Meg RES, 1.0 M, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06031M00JNEA Vishay-Dale R62 1 51 RES, 51, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060351R0JNEA Vishay-Dale R64 1 2.00k RES, 2.00 k, 1%, 0.1 W, 0603 0603 RC0603FR-072KL Yageo America R66 1 4.87k RES, 4.87 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06034K87FKEA Vishay-Dale R68, R77, R93 3 1.00k RES, 1.00 k, 5%, 0.1 W, 0603 0603 RC0603JR-071KL Yageo America R69 1 8.06k RES, 8.06 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06038K06FKEA Vishay-Dale R78, R79 2 2.94k RES, 2.94 k, 1%, 0.1 W, 0603 0603 RC0603FR-072K94L Yageo America R83 1 768k RES, 768 k, 1%, 0.1 W, 0603 0603 RC0603FR-07768KL Yageo America R85 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0720KL Yageo America R86 1 215k RES, 215 k, 1%, 0.1 W, 0603 0603 RC0603FR-07215KL Yageo America S1 1 SLIDE SWITCH DPDT .1A, SMT SWITCH, 5.4x2.5x3.9mm CAS-220TA Copal Electronics

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Table 8. EVM Bill of Materials (continued)

Designator Qty Value Description Package Reference Part Number Manufacturer

(2)

For the ADS1235EVM, U3 is replaced with the ADS1235IRHBR.

S2, S3, S4 3 Switch, Tactile, SPST-NO, 0.05A, 12V, SMT Switch, 4.4x2x2.9 mm TL1015AF160QG E-Switch U1 1 Dual, 5A, High-Speed Low-Side Power MOSFET Driver, D0008A

(SOIC-8)

D0008A UCC27524DR Texas Instruments

(2)

1 6- and 11-Channel, 40-kSPS, 24-Bit, Delta-Sigma ADC with PGA

and Voltage Reference, RHB0032E (VQFN-32)

RHB0032E ADS1261IRHBR TexasInstruments

U4 1 DCK0005A SN74LVC1G06DCKT Texas Instruments U5 1 Low-Noise Positive- and Negative-Output Charge Pump With

Integrated LDO, DSS0012B (WSON-12)

DSS0012B LM27762DSSR Texas Instruments

U6, U7 2 8-Bit Bidirectional Voltage-Level Shifter For Open-Drain And

Push-Pull Application, RGY0020A (VQFN-20)

RGY0020A TXS0108ERGYR Texas Instruments

U9 1 Tiva C Series Microcontroller, 1024 KB Flash, 256 KB SRAM, 12

Bit, 20 Channels, -40 to 85 degC, 128-Pin TQFP (PDT), Green (RoHS & no Sb/Br), Tape and Reel

PDT0128A TM4C1294NCPDTI3R Texas Instruments

U10 1 Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI

Transceiver, QFN-32

5x5 QFN-32 USB3320C-EZK Microchip

U11 1 High-Speed USB 2.0 (480 Mbps) 1:2 Multiplexer / Demultiplexer

Switch with Single Enable, 6 ohm RON, 2.5 to 3.3V, -40 to 85 degC, 10-Pin UQFN (RSE), Green (RoHS & no Sb/Br)

RSE0010A TS3USB221ERSER Texas Instruments

U12 1 USB ESD Solution with Power Clamp, 4 Channels, -40 to +85

degC, 6-pin SON (DRY), Green (RoHS & no Sb/Br)

DRY0006A TPD4S012DRYR Texas Instruments

U13 1 Triple Inverter Buffer/Driver with Open-Drain Output, DCU0008A,

SMALL T&R

DCU0008A SN74LVC3G06DCUT Texas Instruments

U15 1 3.5MHz, 1.5A, 92% Efficient Boost Converter with Adjustable

Input Current Limit, DSG0008A (WSON-8)

DSG0008A TPS61252DSGR Texas Instruments

U16 1 36-V, 1-A, 4.17-uVRMS, RF LDO Voltage Regulator, RGW0020A

(VQFN-20)

RGW0020A TPS7A4700RGWR Texas Instruments

U17 1 Single Output High PSRR LDO, 150 mA, Fixed 1.8 V Output, 2.5

to 6.5 V Input, with Low IQ, 5-pin SC70 (DCK), -40 to 85 degC, Green (RoHS & no Sb/Br)

DCK0005A TPS71718DCKR Texas Instruments

U18 1 Voltage Supervisor with Active-Low, Open Drain Reset, 1 Supply

Monitored, -40 to 125 degC, 3-pin SOT-23 (DBZ), Green (RoHS & no Sb/Br)

DBZ0003A TLV803MDBZR Texas Instruments

U19 1 Single Output LDO, 1A, Adj. (1.2 to 5.0V), Reverse Current

Protection, DRV0006A (WSON-6)

DRV0006A TPS73733DRVR Texas Instruments

Y1 1 Crystal, 25 MHz, 18 pF, SMD ABM3 ABM3-25.000MHZ-D2Y-T Abracon Corporation Y2 1 CRYSTAL, 32.768KHz, 7PF, SMD 1.5x1.4x6.7mm SSPT7F-7PF20-R Seiko Instruments C19 0 22uF CAP, CERM, 22 uF, 10 V, ±10%, X7R, 1206 1206 LMK316AB7226KL-TR Taiyo Yuden C20 0 2.2uF CAP, CERM, 2.2 uF, 10 V, ±10%, X7R, 0603 0603 GRM188R71A225KE15D Murata C21 0 1uF CAP, CERM, 1 uF, 50 V, ±10%, X7R, 0603 0603 UMK107AB7105KA-T Taiyo Yuden C41, C42, C64, C66, C83, C92,

C94, C102, C105

0 0.1uF CAP, CERM, 0.1 uF, 25 V, ±5%, X7R, 0603 0603 06033C104JAT2A AVX

C82, C84, C86, C89, C90, C91, C96, C100, C101

0 10uF CAP, CERM, 10 uF, 35 V, ±10%, X7R, 1206 1206 GMK316AB7106KL Taiyo Yuden

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Table 8. EVM Bill of Materials (continued)

Designator Qty Value Description Package Reference Part Number Manufacturer

C85, C88, C93, C97, C103 0 0.01uF CAP, CERM, 0.01 uF, 25 V, ±10%, X7R, 0603 0603 GRM188R71E103KA01D Murata C87 0 1uF CAP, CERM, 1 uF, 25 V, ±10%, X7R, 0603 0603 GRM188R71E105KA12D Murata C98 0 4700pF CAP, CERM, 4700 pF, 100 V, ±10%, X7R, 0603 0603 06031C472KAT2A AVX C99 0 10pF CAP, CERM, 10 pF, 50 V, ±5%, C0G/NP0, 0603 0603 06035A100JAT2A AVX D6 0 12V Diode, TVS, Uni, 12 V, 19.9 Vc, SMB SMB SMBJ12A-13-F Diodes Inc. D7 0 Green LED, Green, SMD LED_0603 LTST-C191TGKT Lite-On D8 0 20V Diode, Schottky, 20 V, 1 A, SOD-123F SOD-123F PMEG2010AEH,115 Nexperia D9 0 20V Diode, Schottky, 20 V, 1.1 A, DO-219AB DO-219AB SL02-GS08 Vishay-Semiconductor F1 0 Fuse, 2 A, 125VAC/VDC, SMD SMD, 2-Leads, Body

9.73x5.03mm

0154002.DRT Littelfuse

FID1, FID2, FID3, FID4, FID5, FID6

0 Fiducial mark. There is nothing to buy or mount. N/A N/A N/A

H5 0 CABLE USB-A TO MICRO USB-B 1M Used in PnP output and some

BOM reports

102-1092-BL-00100 CNC Tech

J6 0 Header, 2.54 mm, 28x2, Gold, TH Header, 2.54 mm, 28x2, TH TSW-128-07-S-D Samtec J7 0 Header, 100mil, 7x1, Gold, TH 7x1 Header TSW-107-07-G-S Samtec J9 0 Terminal Block, 3.5mm Pitch, 2x1, TH 7.0x8.2x6.5mm ED555/2DS On-Shore Technology J10 0 Connector, DC Jack 2.1X5.5 mm, TH POWER JACK, 14.4x11x9mm PJ-102A CUI Inc. JP1, JP2, JP5 0 Header, 100mil, 2x1, Gold, TH 2x1 Header TSW-102-07-G-S Samtec JP3, JP4 0 Header, 100mil, 3x1, Gold, SMT Samtec_TSM-103-01-X-SV TSM-103-01-L-SV Samtec L2 0 3.3uH Inductor, Shielded Drum Core, Ferrite, 3.3 uH, 1.5 A, 0.033 ohm,

SMD

CDPH4D19F CDPH4D19FNP-3R3MC Sumida

L3 0 10uH Inductor, Shielded Drum Core, Ferrite, 10 uH, 1.2 A, 0.124 ohm,

SMD

CDRH5D18 CDRH5D18NP-100NC Sumida

R8, R59 0 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America R11, R16 0 0 RES, 0, 5%, 0.1 W, 0603 0603 ERJ-3GEY0R00V Panasonic R13, R20, R76 0 100 RES, 100, 1%, 0.1 W, 0603 0603 RC0603FR-07100RL Yageo America R27, R28, R29, R31, R32, R51 0 0 RES, 0, 5%, 0.1 W, 0603 0603 RC0603JR-070RL Yageo America R30 0 0.005 RES, 0.005, 1%, 0.25 W, 1206 1206 WSL12065L000FEA Vishay-Dale R75, R80, R81, R97, R109 0 10.0k RES, 10.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060310K0FKEA Vishay-Dale R88, R89, R91, R92 0 0 RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW06030000Z0EA Vishay-Dale R96 0 1.00k RES, 1.00 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06031K00FKEA Vishay-Dale R98 0 9.31k RES, 9.31 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06039K31FKEA Vishay-Dale R99 0 3.01k RES, 3.01 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06033K01FKEA Vishay-Dale R100 0 158k RES, 158 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW0603158KFKEA Vishay-Dale R101 0 453k RES, 453 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW0603453KFKEA Vishay-Dale R102 0 15.0k RES, 15.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060315K0FKEA Vishay-Dale R103 0 51.1k RES, 51.1 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060351K1FKEA Vishay-Dale

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Table 8. EVM Bill of Materials (continued)

Designator Qty Value Description Package Reference Part Number Manufacturer

R104 0 49.9k RES, 49.9 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060349K9FKEA Vishay-Dale R105 0 1.30Meg RES, 1.30 M, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW06031M30FKEA Vishay-Dale R106 0 100k RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW0603100KFKEA Vishay-Dale R107 0 93.1k RES, 93.1 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060393K1FKEA Vishay-Dale R108 0 121k RES, 121 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW0603121KFKEA Vishay-Dale R110 0 10.0 RES, 10.0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 CRCW060310R0FKEA Vishay-Dale S5 0 Switch, Tactile, SPST-NO, 0.05A, 12V, SMT Switch, 4.4x2x2.9 mm TL1015AF160QG E-Switch TP7, TP10, TP12, TP15, TP32,

TP33, TP34

0 Terminal, Turret, TH, Double Keystone1573-2 1573-2 Keystone

U2 0 High-Precision Voltage Reference with Integrated High-

Bandwidth Buffer, DGK0008A (VSSOP-8)

DGK0008A REF6225IDGKR Texas Instruments

U8 0 8-Bit Bidirectional Voltage-Level Shifter For Open-Drain And

Push-Pull Application, RGY0020A (VQFN-20)

RGY0020A TXS0108ERGYR Texas Instruments

U14 0 256K I2C™ CMOS Serial EEPROM, TSSOP-8 TSSOP-8 24AA256-I/ST Microchip U20 0 Single Output Fast Transient Response LDO, 1.5 A, Adjustable

1.21 to 20 V Output, 2.1 to 20 V Input, 6-pin SOT-223 (DCQ),

-40 to 125 degC, Green (RoHS & no Sb/Br)

DCQ0006A TL1963ADCQR Texas Instruments

U21 0 3-Pin Supply Voltage Supervisors for Automotive, DBV0003A

(SOT-23-3)

DBV0003A TPS3809I50QDBVRQ1 Texas Instruments

U22 0 Single Inverter Buffer/Driver With Open-Drain Output,

DCK0005A, SMALL T&R

DCK0005A SN74LVC1G06DCKT Texas Instruments

U23 0 Step-Up DC-DC Converter with Forced PWM Mode, 2.3 to 6 V,

-40 to 105 degC, 8-pin SOP (PW8), Green (RoHS & no Sb/Br)

PW0008A TPS61085TPWR Texas Instruments

U24 0 Single Output High PSRR LDO, 150 mA, Adjustable 1.2 to 33 V

Output, 3 to 36 V Input, with Ultra-Low Noise, 8-pin MSOP (DGN), -40 to 125 degC, Green (RoHS & no Sb/Br)

DGN0008D TPS7A4901DGNR Texas Instruments

U25 0 Inverting Buck-Boost Adjustable Converter with 2.7 to 5.5 V Input

and -15 to -2 V Output, -40 to 85 degC, 10-Pin SON (DRC), Green (RoHS & no Sb/Br)

DRC0010J TPS63700DRCR Texas Instruments

U26 0 Single Output High PSRR LDO, 200 mA, Adjustable -1.18 to -33

V Output, -3 to -36 V Input, with Ultra-Low Noise, 8-pin MSOP (DGN), -40 to 125 degC, Green (RoHS & no Sb/Br)

DGN0008D TPS7A3001DGNR Texas Instruments

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EVM Bill of Materials, PCB Layouts, and Schematics

5.2 PCB Layouts

Figure 7 through Figure 12 illustrate the PCB layout. The same PCB is used for both the ADS1261EVM

and ADS1235EVM.

Figure 7. Top Silkscreen

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Figure 8. Top Layer (Positive)

Figure 9. Ground Layer (Negative)

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Figure 10. Power Layer (Negative)

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Figure 11. Bottom Layer (Positive)

Figure 12. Bottom Silkscreen

ADS1261 and ADS1235 Evaluation Module

Micro-USB

(Type B)

Connector

USB (1:2) MUX (TS3USB221E)

Data

3.3V

High-Speed USB

2.0 tranceiver (USB3320C)

TIVA MCU

(TM4C1294NCPDT)

ULPI

Standard-speed USB 2.0

1.8V3.3V

ButtonsLEDs

3.3V

256K EEPROM

(Not Installed)

I2C

SPI / I2C / UART / GPIO

USB Power

ADC

3.3V

Analog Inputs

+ RC Filters

Voltage reference

(Not Installed)

Analog Supply Switch

+/-2.5V

Bridge Driver

Fault LED

Bipolar Power

Supplies

3.3V

Analog Headers

Power Jack

(Not Installed)

Level-shifters

(TXS0108E)

Analog side Digital side

SPI / GPIO

Power Management

3.3V

1.8V

+/-2.5V

JTAG Header (Not Installed)

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5.3 Schematic

Figure 13 through Figure 20 illustrate the ADS1261EVM schematics.

Figure 13. ADS1261EVM Block Diagram Schematic

AVSS

A10

GND

AVSS

1 2

R14

R17

R23

100R1

100

R10

100

R15

R13

DNP

100

R18

100

R24

R20

DNP

Input Filtering

Differential cutoff frequency: 60.6 kHz Common-mode cutoff frequency:1.32 MHz

ADS1261

ADS1235 Pinout

Pinout

AVSS

100R26

DNP

Cutoff frequency: 159.1kHz

AVSS

AVDD

DNP

AVSS

AVDD

DNP

Bridge Driver (OPTIONAL)

1 2

J5EXC+_OUT

EXC-_OUT

AVSS

DNP

AVSS/EXC-

AVDD/EXC+

UCC27524DR

ENA

INA

GND

INB

OUTB

VDD

OUTA

ENB

Control the UCC27524DR (Dual non-inverting) driver using ACX1/ACX2 connected to INA/INB,respectively. Set the ADS1261 to 4-wireACX mode, but ONLY enable the ACX1/ACX2 GPIOs.

ALTERNATIVE 2-WIRE AC EXCITATION MODE(SHOWN):

NORMAL 2-WIRE AC EXCITATION MODE:

Replace UCC27524DRwith the UCC27523DR (Dual invert ing) driver and useACX1/ACX2 to control INA/INB, respectively. Set theADS1261 to 2-wire ACX mode, and enable the ACX1/ACX2 GPIOs.

De-populate 0-Ohmresistors before connecting exter nal excitation voltagesources to input terminals!

ENBA and ENBB are internally pulled-up.

Populate R8 instead ofR22 to activate positive bridge excitationwithout requiring the GPIO control signals.

(ACX1)

(ACX2)

2.2uF

C13

220pF

C14

100k

R21

100k

R22

100k

DNP

REF6225IDGKR

VIN

FILT

OUT_S

OUT_F

GND_F

GND_S

DNP

AVSS AVSSAVSS

AVDD

R27

DNP

External Reference (OPTIONAL)

REF6225IDGKRmay be substituted with the REF6250IDGKR

0R28

DNP

0R29

DNP

0R31

DNP

0R32

DNP

REFP0

REFN0

REFP1

REFN1

2.2uF

C20

DNP

22uF

C19

DNP

0.005

R30

DNP

1uF

C21

DNP

REFP0

REFN0

REFP1

REFN1

AINCOM

REFP0

REFN0

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AIN8

AIN9

1 2

1 2 3

6 7 8

DNP

Reference supply input to support 5V external reference

(ON)

(OFF)

ADS1261 Pinout

ADS1235 Pinout

(ADS1261 Only)

1000pF

C10

1000pF

C12

1000pF

C15

1000pF

C17

0.01uF

C11

0.01uF

C16

0.01uF

C18

REFOUT

R25

External excitation source inputs

0R11

DNP

R12

0R16

DNP

R19

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Figure 14. ADS1261EVM Analog Inputs Schematic

ADC_START ADC_nPWDN ADC_nRESET ADC_SCLK ADC_MOSI ADC_MISO ADC_nDRDY ADC_nCS

FAULT_LED

EXT_CLK

ADS1261_DIGITAL

GND

47R46

R44

R41

R40

47R43

R45

R39

R42

External Clock Input

GND

-2.5V +2.5V

+5V

GND

Analog Supply

A) Unipolar (Shown)

B) Bipolar

GND

AVDD

AVSS

4700pF

C28

10uF

C29

C1+

VIN

OUT-

FB-

EN+

CPOUT

C1-

GND

PAD

EN-

OUT+

FB+

PGOOD

LM27762DSSR

1uF

C33

GND

2.2uF

C36

2.2uF

C35

+2.5V

-2.5V

4.7uF

C32

4.7uF

C34

Bipolar Supply Source (OPTIONAL)

A0 A1

A6 A7 A8 A9

A10

A2 A3 A4 A5

REFOUT (ADS1261 Only)

(ADS1261 Only)

(ADS1261 Only) (ADS1261 Only)

GND

GNDGND

0.1uF

C27

100k

R36

100k

R35

100k

R37

100k

R34

The orange LED will lightup to indicate when a STATUS byte error flag isset OR if a CRC mismatch occurred inthe SPI communication.

0.1uF

C24

0.1uF

C25

0.1uF

C22

AVSS

DVDD

AVDD

DVDD

A+DNP

A-DNPD+DNP

D-DNP

0.1

R33

0.1

R38

511k

R55

536k

R56

604k

R53

47R47

Pull-down enablesinternal oscillator when no external clock sourceis provided

DVDD+3.3V

R49

R520R51

DNP

+3.3V+5V

ADC

FAULT LED

DNP DNP

DNP

100k

R48

DNP DNP

DNP

GND

AINCOM

CAPP

CAPN

AVDD

AVSS

REFOUT

PWDN

RESET

START

SCLK

DIN

DRDY

DOUT/DRDY

BYPASS

DGND

DVDD

CLKIN

AIN9

AIN8

AIN7

AIN6

AIN5

AIN4

AIN3

AIN2

AIN1

AIN0

PAD

ADS1261IRHBR

Depopulate 0-Ohm resistor before applying external supplyto DVDD

GND

VCC

SN74LVC1G06DCKT

+3.3V

0.1uF

C31

GND

+5V

1.69k

R50

Orange

FAULT?

549k

R54

1uF

C26

1uF

C30

1uF

C23

EVM Bill of Materials, PCB Layouts, and Schematics

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ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 15. ADS1261EVM ADC Main Schematic

(Connectionto 'ADC_Main' page)

ADS1261_DIGITAL

910

1112

1314

4142

4344

4546

4748

4950

5152

5354

5556

DNP

NT6 NT7 NT8 NT9 NT10

NT12

NT11

NT13

EXT_5V

GND

+3.3V

0.1uF

C38

0.1uF

C37

GNDGND

BANK_ENABLE

SSI2CLK

SSI2XDAT0_TX

SSI2XDAT1_RX

SSI2FSS

UART7RX

UART7TX

SSI2XDAT2

SSI2XDAT3

BANK3_DIGITAL

VCCA

GND

VCCB

PAD

TXS0108ERGY

GND

LVDD1

GND

0.1uF

C41

DNP

0.1uF

C42

DNP

GNDGND

BANK1_DIGITAL

+3.3V

VCCA

GND

VCCB

PAD

TXS0108ERGY

DNP

GND

BANK_ENABLE

I2C4SCL

I2C4SDA

SSI3CLK

SSI3XDAT0_TX

SSI3XDAT1_RX

SSI3FSS

I2C1SDA

I2C1SCL

BANK1_DIGITAL

GND

0.1uF

C40

0.1uF

C39

GNDGND

BANK2_DIGITAL

+3.3V

VCCA

GND

VCCB

PAD

TXS0108ERGY

GND

BANK_ENABLE

UART2TX

UART2RX

SSI0CLK

SSI0XDAT0_TX SSI0XDAT1_RX

SSI0FSS

I2C9SCL I2C9SDA

BANK2_DIGITAL

(Connectionto 'TM4C_Main' page)

LVDD1

NT2 NT3

NT1

DVDD

LVDD2

LVDD3

ADC_MISO

ADC_MOSI

ADC_nCS

ADC_SCLK

ADC_nDRDY

ADC_START

ADC_nRESET

ADC_nPWDN

FAULT_LED

EXT_CLK

ADS1261_DIGITAL

LVDD2

LVDD3

GND

NT4 NT5

100k

R57

100k

R58

100k

R59

DNP

B8→

B3→

B8→ B7→ B6→ B5→ B4→ B3→ B2→ B1→

PD7→

PD3→

PH1→

PA0→ PA1→ PA2→ PA3→ PA4→ PA5→ PA6→ PA7→

PH2→

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EVM Bill of Materials, PCB Layouts, and Schematics

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ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 16. ADS1261EVM Digital Header Schematic

TPD4S012DRYR

D+

D-

GND4NC

VBUS

U12

CLKOUT

NXT

DATA[0]

DATA[1]

DATA[2]

DATA[3]

DATA[4]

REFSEL[0]

DATA[5]

DATA[6]

REFSEL[1]

DATA[7]

REFSEL[2]

SPK_L

SPK_R

CPEN

VDD33

VBAT

VBUS

RBIAS

REFCLK

RESET

VDD18

STP

VDD18

DIR

VDDIO

PAD

U10

USB3320

+1.8V+3.3V +3.3V

+3.3V

8.06k

R69

10.0k

R71

0.1uF

C62

S5 DNP

10.0k

R75

DNP

0.1uF

C64

DNP

GND

1.00kR68

10.0k

R70

GND

0.1uF

C60

GND

USB_VBUS

ULPI_DIGITAL_BUS

USBD0 USBD1 USBD2 USBD3 USBD4 USBD5 USBD6 USBD7

USBSTP USBNXT USBDIR USBCLK USBRST

ULPI_DIGITAL

TS3USB221ERSER

1D+

1D-

2D+

2D-

GND

D-

D+

VCC

U11

+3.3V

0.1uF

C61

GND

10.0k

R67

10.0k

R73

0.1uF

C63

GND

+3.3V

BSL

+3.3V

FAULT_RST

Pressing S1 clears the fault indicator and correspondingLED.

100R72

100R76

DNP

100R74

VSS4SDA

SCL

VCC

U14

DNP

+3.3V

Green

Red

BUSY

1.00k

R77

Green

START

LEDs

EEPROM

10.0k

R80

DNP

10.0k

R81

DNP

+3.3V

WP Pin Connection:

- GND: Writing enabled

- VCC: Writing disabled

0.1uF

C66

DNP

GND

+3.3V

0.1uF

C65

GND GND

2.94k

R79

2.94k

R78

GND

(Connection to 'TM4C_Main' page)

ULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUSULPI_DIGITAL_BUS

BUTTONS

MISC_DIGITAL_BUS

BUTTON1 BSL_BUTTON BUTTON2

LED1_GREEN LED2_GREEN LED3_RED

EEPROM.SCL EEPROM.SDA

MISC_DIGITAL

(Connection to 'TM4C_Main' page)

MISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUSMISC_DIGITAL_BUS

VBUS

D-

D+

GND

678

11109

Micro USB, Type-B, Recepticle

USB

USB_DIGITAL_BUS

USB_FS_DP

USB_FS_DM

USB_MUX_SEL

USB_DIGITAL

(Connection to 'TM4C_Main' page)

USB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUSUSB_DIGITAL_BUS

NOTE: Pins 1 and 2 are equivalent and swapped for simplifiedlayout

7 1

U13A

5 3

U13B

2 6

U13C

VCC8GND

SN74LVC3G06DCUT

U13D

+5V

EVM Bill of Materials, PCB Layouts, and Schematics

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ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 17. ADS1261EVM USB and Peripherals Schematic

5 4

DNP

JTAG header

BANK2_DIGITAL_BUS.UART2RX BANK2_DIGITAL_BUS.UART2TX

BANK1_DIGITAL_BUS.I2C1SCL BANK1_DIGITAL_BUS.I2C1SDA

BANK1_DIGITAL_BUS.SSI3XDAT1_RX BANK1_DIGITAL_BUS.SSI3XDAT0_TX BANK1_DIGITAL_BUS.SSI3FSS BANK1_DIGITAL_BUS.SSI3CLK

BANK2_DIGITAL_BUS.SSI0CLK BANK2_DIGITAL_BUS.SSI0FSS BANK2_DIGITAL_BUS.SSI0XDAT0_TX BANK2_DIGITAL_BUS.SSI0XDAT1_RX

BANK3_DIGITAL_BUS.SSI2XDAT1_RX BANK3_DIGITAL_BUS.SSI2XDAT0_TX BANK3_DIGITAL_BUS.SSI2FSS BANK3_DIGITAL_BUS.SSI2CLK

BANK3_DIGITAL_BUS.SSI2XDAT3 BANK3_DIGITAL_BUS.SSI2XDAT2

ULPI_DIGITAL_BUS.USBRST

USB_DIGITAL_BUS.USB_MUX_SEL MISC_DIGITAL_BUS.BSL_BUTTON

MISC_DIGITAL_BUS.BUTTON2

MISC_DIGITAL_BUS.BUTTON1

BANK1_DIGITAL_BUS.I2C4SDA

BANK1_DIGITAL_BUS.I2C4SCL

BANK2_DIGITAL_BUS.BANK_ENABLE

BANK2_DIGITAL_BUS.I2C9SCL BANK2_DIGITAL_BUS.I2C9SDA

BANK3_DIGITAL_BUS.BANK_ENABLE

BANK1_DIGITAL_BUS.BANK_ENABLE

MISC_DIGITAL_BUS.LED1_GREEN

MISC_DIGITAL_BUS.LED2_GREEN

MISC_DIGITAL_BUS.LED3_RED

ULPI_DIGITAL_BUS.USBSTP ULPI_DIGITAL_BUS.USBCLK MISC_DIGITAL_BUS.EEPROM.SCL MISC_DIGITAL_BUS.EEPROM.SDA

UART1RX

UART1TX

BANK3_DIGITAL_BUS.UART7RX BANK3_DIGITAL_BUS.UART7TX

ULPI_DIGITAL_BUS.USBD5

ULPI_DIGITAL_BUS.USBD4

ULPI_DIGITAL_BUS.USBD3

ULPI_DIGITAL_BUS.USBD2

ULPI_DIGITAL_BUS.USBD1

ULPI_DIGITAL_BUS.USBD0

USB_DIGITAL_BUS.USB_FS_DP USB_DIGITAL_BUS.USB_FS_DM

ULPI_DIGITAL_BUS.USBD6

ULPI_DIGITAL_BUS.USBD7

ULPI_DIGITAL_BUS.USBDIR

ULPI_DIGITAL_BUS.USBNXT

0.1uF

C59

2.2uF

C57

GND

+3.3V

0.1uF

C54

0.1uF

C53

0.1uF

C51

GND

0.1uF

C52

1uF

C58

GND

0.1uF

C43

R62

+3.3V

4 3

12pF

C45

12pF

C46

6.8pF

C56

6.8pF

C55

10.0k

R60

0.1uF

C44

4.87kR66

GND

GND GND

GND

JP1

TIVA RST

DNP

External Controller Select

This jumper is used to holdTIVA in reset and disable level shifters whenusing external microprocessor/microcontroller

+3.3V

RESET

100R63

1.0M

R61

2.00kR64

2.2uF

C47

GND

0.1uF

C48

0.1uF

C49

0.1uF

C50

GND GND

+3.3V +1.8V+3.3V

VBAT VDDIO VDD18

(Connection to 'Digital_Header'page)

BANK1_DIGITAL_BUS

BANK2_DIGITAL

BANK2_DIGITAL_BUS

BANK3_DIGITAL

BANK3_DIGITAL_BUS

BANK1_DIGITAL

BANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUSBANK1_DIGITAL_BUS

JTAG_RESET

(Connection to'USB_Misc page)

ULPI_DIGITAL_BUS

ULPI_DIGITAL

MISC_DIGITAL_BUS

MISC_DIGITAL

USB_DIGITAL_BUS

USB_DIGITAL

PD0/AIN15/C0O/I2C7SCL/SSI2XDAT1/T0CCP0

PD1/AIN14/C1O/I2C7SDA/SSI2XDAT0/T0CCP1

PD2/AIN13/C2O/I2C8SCL/SSI2FSS/T1CCP0

PD3/AIN12/I2C8SDA/SSI2CLK/T1CCP1

PE3/AIN0/U1DTR

PE2/AIN1/U1DCD

PE1/AIN2/U1DSR

PE0/AIN3/U1RTS

PC7/C0-/EPI0S4/U5TX

PC6/C0+/EPI0S5/U5RX

PC5/C1+/EPI0S6/RTCCLK/U7TX

PC4/C1-/EPI0S7/U7RX

PH0/EPI0S0/U0RTS

PH1/EPI0S1/U0CTS

PH2/EPI0S2/U0DCD

PH3/EPI0S3/U0DSR

PA0/CAN0RX/I2C9SCL/T0CCP0/U0RX

PA1/CAN0TX/I2C9SDA/T0CCP1/U0TX

PA2/I2C8SCL/SSI0CLK/T1CCP0/U4RX

PA3/I2C8SDA/SSI0FSS/T1CCP1/U4TX

PA4/I2C7SCL/SSI0XDAT0/T2CCP0/U3RX

PA5/I2C7SDA/SSI0XDAT1/T2CCP1/U3TX

PA6/EPI0S8/I2C6SCL/SSI0XDAT2/T3CCP0/U2RX/USB0EPEN

PA7/EPI0S9/I2C6SDA/SSI0XDAT3/T3CCP1/U2TX/USB0EPEN/USB0PFLT

PF0/EN0LED0/M0PWM0/SSI3XDAT1/TRD2

PF1/EN0LED2/M0PWM1/SSI3XDAT0/TRD1

PF2/M0PWM2/SSI3FSS/TRD0

PF3/M0PWM3/SSI3CLK/TRCLK

PF4/EN0LED1/M0FAULT0/SSI3XDAT2/TRD3

PG0/EN0PPS/EPI0S11/I2C1SCL/M0PWM4

PG1/EPI0S10/I2C1SDA/M0PWM5

PB2/EPI0S27/I2C0SCL/T5CCP0/USB0STP

PB3/EPI0S28/I2C0SDA/T5CCP1/USB0CLK

PB0/CAN1RX/I2C5SCL/T4CCP0/U1RX/USB0ID

PB1/CAN1TX/I2C5SDA/T4CCP1/U1TX/USB0VBUS

PC3/SWO/TDO

PC2/TDI

PC1/SWDIO/TMS

PC0/SWCLK/TCK

100

PB5/AIN11/I2C5SDA/SSI1CLK/U0RTS

120

PB4/AIN10/I2C5SCL/SSI1FSS/U0CTS

121

PE4/AIN9/SSI1XDAT0/U1RI

123

PE5/AIN8/SSI1XDAT1

124

PD4/AIN7/SSI1XDAT2/T3CCP0/U2RX

125

PD5/AIN6/SSI1XDAT3/T3CCP1/U2TX

126

PD6/AIN5/SSI2XDAT3/T4CCP0/U2RTS/USB0EPEN

127

PD7/AIN4/NMI/SSI2XDAT2/T4CCP1/U2CTS/USB0PFLT

128

PQ0/EPI0S20/SSI3CLK

PQ1/EPI0S21/SSI3FSS

PQ2/EPI0S22/SSI3XDAT0

PK0/AIN16/EPI0S0/U4RX

PK1/AIN17/EPI0S1/U4TX

PK2/AIN18/EPI0S2/U4RTS

PK3/AIN19/EPI0S3/U4CTS

PQ3/EPI0S23/SSI3XDAT1

PK7/EPI0S24/I2C4SDA/M0FAULT2/RTCCLK/U0RI

PK6/EN0LED1/EPI0S25/I2C4SCL/M0FAULT1

PK5/EN0LED2/EPI0S31/I2C3SDA/M0PWM7

PK4/EN0LED0/EPI0S32/I2C3SCL/M0PWM6

PM7/T5CCP1/TMPR0/U0RI

PM6/T5CCP0/TMPR1/U0DSR

PM5/T4CCP1/TMPR2/U0DCD

PM4/T4CCP0/TMPR3/U0CTS

PM3/EPI0S12/T3CCP1

PM2/EPI0S13/T3CCP0

PM1/EPI0S14/T2CCP1

PM0/EPI0S15/T2CCP0

PL0/EPI0S16/I2C2SDA/M0FAULT3/USB0D0

PL1/EPI0S17/I2C2SCL/PHA0/USB0D1

PL2/C0O/EPI0S18/PHB0/USB0D2

PL3/C1O/EPI0S19/IDX0/USB0D3

PL4/EPI0S26/T0CCP0/USB0D4

PL5/EPI0S33/T0CCP1/USB0D5

PL7/T1CCP1/USB0DM

PL6/T1CCP0/USB0DP

PQ4/DIVSCLK/U1RX

102

PP2/EPI0S29/U0DTR/USB0NXT

103

PP3/EPI0S30/RTCCLK/U0DCD/U1CTS/USB0DIR

104

PP4/U0DSR/U3RTS/USB0D7

105

PP5/I2C2SCL/U3CTS/USB0D6

106

PN0/U1RTS

107

PN1/U1CTS

108

PN2/EPI0S29/U1DCD/U2RTS

109

PN3/EPI0S30/U1DSR/U2CTS

110

PN4/EPI0S34/I2C2SDA/U1DTR/U3RTS

111

PN5/EPI0S35/I2C2SCL/U1RI/U3CTS

112

PJ0/EN0PPS/U3RX

116

PJ1/U3TX

117

PP0/C2+/SSI3XDAT2/U6RX

118

PP1/C2-/SSI3XDAT3/U6TX

119

TM4C1294NCPDTI3R

U9A

WAKE

HIB

XOSC0

XOSC1

RST

OSC0

OSC1

EN0RXIN

EN0RXIP

EN0TXON

EN0TXOP

VREFA+

RBIAS

TM4C1294NCPDTI3R

U9B

VDD

VDDA8GNDA

VDD

GND

VDD

GND

VDD

GND

VBAT

VDD

GND

VDDC

VDD

101

VDD

113

GND

114

VDDC

115

VDD

122

TM4C1294NCPDTI3R

U9C

0R65

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EVM Bill of Materials, PCB Layouts, and Schematics

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ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 18. ADS1261EVM Processor Main Schematic

USB_REG

0.1uF

C72

GND

VOUT

ILIM

VIN

PAD

U15

TPS61252

1uH

215k

R86

768k

R83

20.0k

R85

USB 5.0V to regulated 5.0V

0.1uF

C67

GND

JP2

DNP

GND

1000pF

C81

GNDGND

GND

OUT

NR/FB

GND

PAD

U19

TPS737xxDRV

+1.8V

0.1

R82

TLV803MDBZR

GND

RESET

VDD

U18

1.00k

R93

GND

Green

LED

GND

USB_VBUSP

GND

USB_VBUS

GND

DNP

GND

DNP

GND

DNP

GND

TPS71718DCKR

EN3NR

OUT

GND

U17

1000pF

C77

GND

USB_BOOST

10uF

C71

GND

Vout (V)

Programmable LDO Configuration(U13)

3P2V 1P6V 0P8V 0P4V 0P2V 0P1V

1.4

1.5

1.8

2.5

3.0

3.3

4.5

5.0 INSTALLED

INSTALLEDINSTALLED INSTALLED

INSTALLEDINSTALLED

INSTALLED

DNI = Do not install

DNI

DNIDNI

DNI

DNI DNI

DNI

INSTALLED DNI

INSTALLED

DNI

INSTALLED

INSTALLED = install 0 Ohm jumperor short pads together

4.7uF

C68

EXT_5V

Jumper Position DVDD (JP3) AVDD (JP10)

1-2

2-3

USB 5V

EXT 5V

USB 5V

EXT 5V

USB_BOOST

1 2 3

JP3

DNP

1 2 3

JP4

DNP

+5V

USB_REG

+3.3V

USB PWDN

GNDGND

22uF

C70

100pF

C69

OUT

SENSE

6P4V2

6P4V1

3P2V

GND

1P6V

0P8V

0P4V

0P2V

0P1V

OUT

PAD

U16

TPS7A4700RGW

0.1uF

C78

GND

Threshold: 4.38V

1uF

C75

1uF

C76

1uF

C79

1uF

C80

100k

R84

VBUS+

DNP

VBUS-

DNP

+5.5V

DNP

1uF

C74

47uF

C73

R870R88

DNP

R89

DNP

R900R91

DNP

R92

DNP

R94

R95

Remove/Install 0 ohm resistors as need to achieve desired output voltage

EVM Bill of Materials, PCB Layouts, and Schematics

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SBAU293–March 2018

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ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 19. ADS1261EVM USB Power Schematic

TPS7A4901DGNR

OUT

NR/SS6DNC

EP GND

U24

DNP

TPS7A3001DGNR

EP GND

OUT

NR/SS

DNC

U26

DNP

12V

D6 Diode_TVS_Uni

DNP

EXT_5V

10uF

C82

DNP

10uF

C84

DNP

0.1uF

C83

DNP

Green

EXT 5V OK?

DNP

1.00k

R96

DNP

TPS3809I50QDBVRQ1

GND

RESET

VDD

U21

DNP

0.01uF

C85

DNP

3.01k

R99

DNP

9.31k

R98

DNP

10.0k

R97

DNP

3 2

J10

DNP

10uF

C100

DNP

0.01uF

C103

DNP

-HVSS

0.01uF

C97

DNP

93.1k

R107

DNP

10.0k

R109

DNP

10uF

C90

DNP

0.01uF

C93

DNP

0.01uF

C88

DNP

453k

R101

DNP

49.9k

R104

DNP

Fuse

DNP

100k

R106

DNP

10uF

C86

DNP

1uF

C87

DNP

0.1uF

C94

DNP

EXT_5V

10uF

C89

DNP

1100pF

C95

DNP

51.1k

R103

DNP

158k

R100

DNP

15.0k

R102

DNP

3.3uH

DNP

DCV_WALL

HVBoost

GND

GNDGND

GND

GNDGND

GND

GND GND

GND

GNDGND

GND

10uF

C101

DNP

10uF

C91

DNP

0.1uF

C102

DNP

0.1uF

C92

DNP

12V/50mA

-12V/50mA

Replacement Fuse

Littlefuse P/N 0453002. (Fast Acting) Littlefuse P/N 0454002. (Slow acting)*Installed

1 2

DNP

GND

EXT 5V PWDN

HVInvert

TL1963ADCQR

GND

SHDN

OUT

ADJ

U20

DNP

TPS63700DRCR

COMP

GND

VIN

PS_GND

OUT

VREF

U25

DNP

TPS61085TPWR

COMP

PGND

FREQ

U23

DNP

+HVDD

JP5

DNP

10.0

R110

DNP

0.1uF

C105

DNP

EXT_5V

4700pF

C98

DNP

GND

DNP

1.30M

R105

DNP

121k

R108

DNP

10pF

C99

DNP

GND

10uH

DNP

0.22uF

C104

DNP

10uF

C96

DNP

GND

DNP

GND

VCC

SN74LVC1G06DCKT

U22

DNP

GND

Wall supply and terminal block Input voltage = 5 - 12V

www.ti.com

EVM Bill of Materials, PCB Layouts, and Schematics

SBAU293–March 2018

Submit Documentation Feedback

ADS1261 and ADS1235 Evaluation Module

ADVANCE INFORMATION

Figure 20. ADS1261EVM External Power Schematic

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned, or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production system.

2 Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM. User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10) business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day warranty period.

3 Regulatory Notices:

3.1 United States

3.1.1 Notice applicable to EVMs not FCC-Approved:

FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference. Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.

3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:

CAUTION

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

FCC Interference Statement for Class A EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

3.2 Canada

3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247

Concerning EVMs Including Radio Transmitters:

This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may

cause undesired operation of the device.

Concernant les EVMs avec appareils radio:

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concerning EVMs Including Detachable Antennas:

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur

3.3 Japan

3.3.1 Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に

輸入される評価用キット、ボードについては、次のところをご覧ください。

http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page

3.3.2 Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified by TI as conforming to Technical Regulations of Radio Law of Japan.

If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required to follow the instructions set forth by Radio Law of Japan, which includes, but is not limited to, the instructions below with respect to EVMs (which for the avoidance of doubt are stated strictly for convenience and should be verified by User):

1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of Japan,

2. Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or

3. Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan.

【無線電波を送信する製品の開発キットをお使いになる際の注意事項】開発キットの中には技術基準適合証明を受けていないものがあります。技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。

1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。

2. 実験局の免許を取得後ご使用いただく。

3. 技術基準適合証明を取得後ご使用いただく。

なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。日本テキサス・インスツルメンツ株式会社東京都新宿区西新宿６丁目２４番１号西新宿三井ビル

3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page

電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧ください。http:/

/www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page

3.4 European Union

3.4.1 For EVMs subject to EU Directive 2014/30/EU (Electromagnetic Compatibility Directive): This is a class A product intended for use in environments other than domestic environments that are connected to a

low-voltage power-supply network that supplies buildings used for domestic purposes. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

4 EVM Use Restrictions and Warnings:

4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.

4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices. The notices contain important safety information related to, for example, temperatures and voltages.

4.3 Safety-Related Warnings and Restrictions:

4.3.1 User shall operate the EVM within TI’s recommended specifications and environmental considerations stated in the user guide, other available documentation provided by TI, and any other applicable requirements and employ reasonable and customary safeguards. Exceeding the specified performance ratings and specifications (including but not limited to input and output voltage, current, power, and environmental ranges) for the EVM may cause personal injury or death, or property damage. If there are questions concerning performance ratings and specifications, User should contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may also result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the EVM user guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, even with the inputs and outputs kept within the specified allowable ranges, some circuit components may have elevated case temperatures. These components include but are not limited to linear regulators, switching transistors, pass transistors, current sense resistors, and heat sinks, which can be identified using the information in the associated documentation. When working with the EVM, please be aware that the EVM may become very warm.

4.3.2 EVMs are intended solely for use by technically qualified, professional electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems, and subsystems. User assumes all responsibility and liability for proper and safe handling and use of the EVM by User or its employees, affiliates, contractors or designees. User assumes all responsibility and liability to ensure that any interfaces (electronic and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard. User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees, affiliates, contractors or designees.

4.4 User assumes all responsibility and liability to determine whether the EVM is subject to any applicable international, federal, state, or local laws and regulations related to User’s handling and use of the EVM and, if applicable, User assumes all responsibility and liability for compliance in all respects with such laws and regulations. User assumes all responsibility and liability for proper disposal and recycling of the EVM consistent with all applicable international, federal, state, and local requirements.

5. Accuracy of Information: To the extent TI provides information on the availability and function of EVMs, TI attempts to be as accurate as possible. However, TI does not warrant the accuracy of EVM descriptions, EVM availability or other information on its websites as accurate, complete, reliable, current, or error-free.

6. Disclaimers:

6.1 EXCEPT AS SET FORTH ABOVE, EVMS AND ANY MATERIALS PROVIDED WITH THE EVM (INCLUDING, BUT NOT LIMITED TO, REFERENCE DESIGNS AND THE DESIGN OF THE EVM ITSELF) ARE PROVIDED "AS IS" AND "WITH ALL FAULTS." TI DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, REGARDING SUCH ITEMS, INCLUDING BUT NOT LIMITED TO ANY EPIDEMIC FAILURE WARRANTY OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADE SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS.

6.2 EXCEPT FOR THE LIMITED RIGHT TO USE THE EVM SET FORTH HEREIN, NOTHING IN THESE TERMS SHALL BE CONSTRUED AS GRANTING OR CONFERRING ANY RIGHTS BY LICENSE, PATENT, OR ANY OTHER INDUSTRIAL OR INTELLECTUAL PROPERTY RIGHT OF TI, ITS SUPPLIERS/LICENSORS OR ANY OTHER THIRD PARTY, TO USE THE EVM IN ANY FINISHED END-USER OR READY-TO-USE FINAL PRODUCT, OR FOR ANY INVENTION, DISCOVERY OR IMPROVEMENT, REGARDLESS OF WHEN MADE, CONCEIVED OR ACQUIRED.

7. USER'S INDEMNITY OBLIGATIONS AND REPRESENTATIONS. USER WILL DEFEND, INDEMNIFY AND HOLD TI, ITS LICENSORS AND THEIR REPRESENTATIVES HARMLESS FROM AND AGAINST ANY AND ALL CLAIMS, DAMAGES, LOSSES, EXPENSES, COSTS AND LIABILITIES (COLLECTIVELY, "CLAIMS") ARISING OUT OF OR IN CONNECTION WITH ANY HANDLING OR USE OF THE EVM THAT IS NOT IN ACCORDANCE WITH THESE TERMS. THIS OBLIGATION SHALL APPLY WHETHER CLAIMS ARISE UNDER STATUTE, REGULATION, OR THE LAW OF TORT, CONTRACT OR ANY OTHER LEGAL THEORY, AND EVEN IF THE EVM FAILS TO PERFORM AS DESCRIBED OR EXPECTED.

8. Limitations on Damages and Liability:

8.1 General Limitations. IN NO EVENT SHALL TI BE LIABLE FOR ANY SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES IN CONNECTION WITH OR ARISING OUT OF THESE TERMS OR THE USE OF THE EVMS , REGARDLESS OF WHETHER TI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. EXCLUDED DAMAGES INCLUDE, BUT ARE NOT LIMITED TO, COST OF REMOVAL OR REINSTALLATION, ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, RETESTING, OUTSIDE COMPUTER TIME, LABOR COSTS, LOSS OF GOODWILL, LOSS OF PROFITS, LOSS OF SAVINGS, LOSS OF USE, LOSS OF DATA, OR BUSINESS INTERRUPTION. NO CLAIM, SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN TWELVE (12) MONTHS AFTER THE EVENT THAT GAVE RISE TO THE CAUSE OF ACTION HAS OCCURRED.

8.2 Specific Limitations. IN NO EVENT SHALL TI'S AGGREGATE LIABILITY FROM ANY USE OF AN EVM PROVIDED HEREUNDER, INCLUDING FROM ANY WARRANTY, INDEMITY OR OTHER OBLIGATION ARISING OUT OF OR IN CONNECTION WITH THESE TERMS, , EXCEED THE TOTAL AMOUNT PAID TO TI BY USER FOR THE PARTICULAR EVM(S) AT ISSUE DURING THE PRIOR TWELVE (12) MONTHS WITH RESPECT TO WHICH LOSSES OR DAMAGES ARE CLAIMED. THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT.

9. Return Policy. Except as otherwise provided, TI does not offer any refunds, returns, or exchanges. Furthermore, no return of EVM(s) will be accepted if the package has been opened and no return of the EVM(s) will be accepted if they are damaged or otherwise not in a resalable condition. If User feels it has been incorrectly charged for the EVM(s) it ordered or that delivery violates the applicable order, User should contact TI. All refunds will be made in full within thirty (30) working days from the return of the components(s), excluding any postage or packaging costs.

10. Governing Law: These terms and conditions shall be governed by and interpreted in accordance with the laws of the State of Texas, without reference to conflict-of-laws principles. User agrees that non-exclusive jurisdiction for any dispute arising out of or relating to these terms and conditions lies within courts located in the State of Texas and consents to venue in Dallas County, Texas. Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES

Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products; by downloading, accessing or using any particular TI Resource in any way, you (individually or, if you are acting on behalf of a company, your company) agree to use it solely for this purpose and subject to the terms of this Notice.

TI’s provision of TI Resources does not expand or otherwise alter TI’s applicable published warranties or warranty disclaimers for TI products, and no additional obligations or liabilities arise from TI providing such TI Resources. TI reserves the right to make corrections, enhancements, improvements and other changes to its TI Resources.

You understand and agree that you remain responsible for using your independent analysis, evaluation and judgment in designing your applications and that you have full and exclusive responsibility to assure the safety of your applications and compliance of your applications (and of all TI products used in or for your applications) with all applicable regulations, laws and other applicable requirements. You represent that, with respect to your applications, you have all the necessary expertise to create and implement safeguards that (1) anticipate dangerous consequences of failures, (2) monitor failures and their consequences, and (3) lessen the likelihood of failures that might cause harm and take appropriate actions. You agree that prior to using or distributing any applications that include TI products, you will thoroughly test such applications and the functionality of such TI products as used in such applications. TI has not conducted any testing other than that specifically described in the published documentation for a particular TI Resource.

You are authorized to use, copy and modify any individual TI Resource only in connection with the development of applications that include the TI product(s) identified in such TI Resource. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT, AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN, including but not limited to any patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information regarding or referencing third-party products or services does not constitute a license to use such products or services, or a warranty or endorsement thereof. Use of TI Resources may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.

TI RESOURCES ARE PROVIDED “AS IS” AND WITH ALL FAULTS. TI DISCLAIMS ALL OTHER WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED, REGARDING TI RESOURCES OR USE THEREOF, INCLUDING BUT NOT LIMITED TO ACCURACY OR COMPLETENESS, TITLE, ANY EPIDEMIC FAILURE WARRANTY AND ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.

TI SHALL NOT BE LIABLE FOR AND SHALL NOT DEFEND OR INDEMNIFY YOU AGAINST ANY CLAIM, INCLUDING BUT NOT LIMITED TO ANY INFRINGEMENT CLAIM THAT RELATES TO OR IS BASED ON ANY COMBINATION OF PRODUCTS EVEN IF DESCRIBED IN TI RESOURCES OR OTHERWISE. IN NO EVENT SHALL TI BE LIABLE FOR ANY ACTUAL, DIRECT, SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES IN CONNECTION WITH OR ARISING OUT OF TI RESOURCES OR USE THEREOF, AND REGARDLESS OF WHETHER TI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

You agree to fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of your noncompliance with the terms and provisions of this Notice.

This Notice applies to TI Resources. Additional terms apply to the use and purchase of certain types of materials, TI products and services. These include; without limitation, TI’s standard terms for semiconductor products http://www.ti.com/sc/docs/stdterms.htm), evaluation

modules, and samples (http://www.ti.com/sc/docs/sampterms.htm).

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Texas Instruments ADS1261EVM, ADS1235EVM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual