Texas Instruments ADS1626 EVM User Manual

ADS1625 and ADS1626 EVM

User’s G uide

December 2003 Data Acquistion

SLAU123

IMPORTANT NOTICE

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

Copyright  2003, Texas Instruments Incorporated

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER W ARRANTIES, EXPRESSED,
IMPLIED, OR S TATUTOR Y, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 8 V to 40 V and the output
voltage range of 0 V and 5 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User ’s 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, some circuit components may have case temperatures greater than
70°C. The EVM is designed to operate properly with certain components above 0°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2003, Texas Instruments Incorporated

About This Manual

Information About Cautions and Warnings

Preface

Read This First

This user’s guide describes the characteristics, operation, and use of the
ADS1625/26 EVM 18-bit Analog-to-Digital Evaluation Board. A complete cir­cuit description as well as schematic diagram and bill of materials are included.
Contact the Product Information Center or e-mail [e-mail]
for questions regarding this EVM.

How to Use This Manual

This document contains the following chapters:

- Chapter 1 – EVM Overview

- Chapter 2 – Digital Interface

- Chapter 3 – Power Distribution

- Chapter 4 – Getting the Most From Your EVM

- Chapter 5 − EVM BOM, ADS1625/26EVM Layouts and

Schematics

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.
A caution statement describes a situation that could potentially

damage your software or equipment.

This is an example of a warning statement.
A warning statement describes a situation that could potentially

cause harm to you.

iii

Trademarks

The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.

Related Documentation From Texas Instruments

To obtain a copy of any of the following TI documents, call the Texas
Instruments Literature Response Center at [phone] or the Product
Information Center (PIC) at [phone]. When ordering, please identify
this booklet by its title and literature number. Updated documents can also be
obtained through our website at www.ti.com.

Data Sheets: Literature Number:

ADS1625/ADS1626 SBAS280
REF02 SBVS003A
OPA2822 SBOS188A

FCC Warning

This equipment is intended for use in a laboratory test environment only. It ge n­erates, uses, and can radiate radio frequency energy and has not been tested
for compliance with the limits of computing devices pursuant to subpart J of
part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other en­vironments may cause interference with radio communications, in which case
the user at his own expense will be required to take whatever measures may
be required to correct this interference.

Trademarks

TI Logo, TMS320C2000, TMS320C5000, TMS320C6000, and Code
Composer Studio are trademarks of Texas Instruments.

iv

Contents

Contents

1 EVM Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Analog Input 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 External Reference 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Modulator Clock 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Digital Interface 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Board-Level Control 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.1 DIP Switch Options 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Jumper Options 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.3 Resetting the ADS1625 and ADS1626 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.4 Out of Range Indication 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.5 Interrupt Source 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.6 Base Address 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.7 Base Address and Chip Select 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 External Interface 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Data Connector Pinout 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.1 Control Connector Pinout 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Power Distribution 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Getting the Most From Y our EVM 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Stand-Alone EVM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 DSP Interface 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2.1 TMS320C6711 Interface 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 EVM BOM, ADS1625/26 EVM Layouts and Schematics 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 EVM Bill of Materials 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 ADS1625/26 EVM Layout Details 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 ADS1625/26 EVM Schematics 5-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v

Contents

Figures

1−1 Default Configuration Used by the EVM 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−2 Block Diagram 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−1 Arrangement of DSK, Interface Card and EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−1 Jumper Settings for J13 and J14 on the 5−6K Interface Card 4-3. . . . . . . . . . . . . . . . . . . . . . .

4−2 CCS Project Menu 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−3 CCS Project Open Dialog 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−4 CCS Project View 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−5 CCS Context Menu 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−6 CCS Graph Property Windows 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−7 CCS Window With Graph 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−1 Top Tracking Layer 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−2 Internal Power and Ground Layers 5-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−3 Bottom Tracking Layer 5-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1−1 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−2 Selection Between Internal/External Reference 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−3 External Reference 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−4 Modulator Clock Settings 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−1 Switch Function Control 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−2 FIFO Settings 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−3 Jumper Options 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−4 Memory Space Address 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−5 Assignment and Function at J2/P2 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−6 Assignment and Function at J3/P3 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−1 Power Connector P4/J4 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−1 Jumper Settings for J13 and J14 on the 5−6K Interface Card 4-3. . . . . . . . . . . . . . . . . . . . . . .

5−1 ADS1625 Bill of Materials 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−2 ADS1626 Bill of Materials 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

Chapter 1

EVM Overview

Topic Page

1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Analog Input 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 External Reference 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Modulator Clock 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EVM Overview

1-1

Features

1.1 Features

1.2 Introduction

- Evaluation Board featuring the ADS1625 ADC (order ADS1625 EVM) or

ADS1626 (order ADS1626 EVM)

- Onboard reference, with recommended buffer circuitry

- Onboard signal conditioning.

- Basic system-level logic decoding.

The ADS1625 EVM is a high speed, high-resolution, delta sigma (∆Σ)
analog-to- digital converter. It features a data rate of 1.25 MSPS, a bandwidth
(−3 dB) of 615 kHz and a passband ripple of less than ±0.0025 dB.

The evaluation module (EVM) is a stand-alone, full-featured system that offers
data sheet performance. Additionally, the EVM conforms to a common
electrical and mechanical pinout for analog I/O, digital I/O, and power,
enabling the EVM to be quickly adapted to various host platforms.

1.3 Analog Interface

The analog interface consists of the following subsections:

- Analog input

- External reference

- Modulator clock

Each portion of the analog interface can be adapted to some extent. The
modifications are summarized in Table 1−1 and discussed in detail in the
appropriate subsection of this chapter.

Table 1−1.Analog Interface

Reference

Designator

Analog Input options

W1 Selects AIN_N source Installed Not installed
W2 Selects AIN source Installed Not installed

Reference voltage options

W3 Selects VREFN source Installed Not installed
W4 Selects VCOM source Installed Not installed
W5 Selects VREFP source Installed Not installed
W6 Connects VCM for on board reference Installed

Modulator clock options

W7 Modulator clock source Installed Not installed

Description

Factory Set Condition

1−2 2−3

1-2

1.4 Analog Input

Various options are available to deliver the signal to the ADC:

- Single-ended via SMA connector at J6.

- Single-ended via socket strip/header at J1/P1 connector.

- Differentially via socket strip/header at J1/P1 connector.

The default configuration used by the EVM is shown in Figure 1−1. It provides
a convenient method to convert a single-ended bipolar signal into a differential
signal. The signal is centered on a common mode voltage derived from the
reference section of the EVM.

Figure 1−1.Default Configuration Used by the EVM

Common Mode Voltage

Gain = 1

Gain = −1

Analog Input

To W1 and W5

Common Mode Voltage

The differential signal is routed via W1 and W5, which enables the user to
provide an external signal.

1.5 External Reference

The selection between the device’s internal reference and an external
reference is made by SW1. 8−9

Table 1−2.Selection Between Internal/External Reference

Reference Designator Voltage Reference Selection

SW1 8−9 Internal External

0 Not selected Selected
1 Selected Not selected

To use the external reference voltage, the user must apply an input voltage via
J7, the voltage supplied must be between 8 V and 40 V.

The external reference voltage is generated differentially and can be adjusted
by three potentiometers, detailed in Table 1−3.

Table 1−3.External Reference

Reference Designator Function

RV2 Adjusts main +5 V
RV1 Adjusts REF+ voltage
RV3 Adjusts REF− voltage

EVM Overview

1-3

Modulator Clock

Figure 1−2 shows a block diagram of the configuration.

Figure 1−2.Block Diagram

8 V − 40 V

5-V

Reference

1.6 Modulator Clock

The ADS1625 and ADS1626 partition the modulator clock as part of the analog
section. Two options are available. The clock can either be supplied via the
onboard 40-MHz oscillator, or externally via J5. This option is useful for
low-jitter coherent sampling during testing.

Table 1−4.Modulator Clock Settings

Reference

Designator

W7 Modulator Clock Source Installed Not installed

Gain = 1

Gain = 1

Gain = 1

Gain = 1

REF+

V

Description 1−2

(REF+) + (REF−)

=

MID

REF−

V

CM

2

Factory-Set Condition

Clock .40 MHz

To ADC

To Analog Input

2−3

Clock .J5

1-4

Chapter 2

Digital Interface

This chapter describes the EVM digital interface consists of the following
subsections:

Topic Page

2.1 Board-Level Control 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 External Interface 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Data Connector Pinout 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital Interface

2-1

Board-Level Control

2.1 Board-Level Control

2.1.1 DIP Switch Options

The optional settings for the ADS1625/26 are set and controlled manually via
a DIP switch – SW1. The functions controlled by this switch are summarized
below.

Table 2−1.Switch Function Control

Switch Factory-Set Condition

Position Function 1 0

8 External reference External reference is selected Internal reference is selected
7 Power down Device is not powered down Device is powered down
6 Reserved
5 Reserved
4 Reserved
3 FIFO 0 Only applicable to ADS1626, See Table 2−2
2 FIFO 1
1 FIFO 2

Table 2−2.FIFO Settings

FIFO 2 FIFO 1 FIFO 0 FIFO Buffer Level

0 0 0 0
0 0 1 2
0 1 0 4
0 1 1 6
1 0 0 8
1 0 1 10
1 1 0 12
1 1 1 14

More information on the operation and use of the FIFO can be found in the
ADS1625/26 data sheet.

2.1.2 Jumper Options

There are 5 jumpers associated with the digital control section. Their functions
are detailed in Table 2−3.

Table 2−3.Jumper Options

Reference

Reference

Designator

W9 Select RESET source Derived from W10 Directly from J3 pin 3
W10 Select WR source Derived from digital interface Manual, via SW2
W11 Select DRDY source Falling edge interrupt Rising edge interrupt
J8 1−2 Address line A2 High
J8 3−4 Address line A3 High

Description

Factory-Set Condition

1−2 2−3

2-2

2.1.3 Resetting the ADS1625 and ADS1626

The ADS1625 and ADS1626 are synchronously reset on the EVM when the
RESET pin is asserted LOW. This can be accomplished by issuing a write
command (WR) via the host system or momentarily depressing switch SW2.
Whichever option is chosen, the reset signal is then synchronized with the
modulator clock and is available for application to the RESET pin of the device.
Alternatively, the user can apply the RESET signal directly via W9.

2.1.4 Out of Range Indication

LED D1 indicates if an out of range (OTR) event has occurred. This LED does
not affect the device’s performance. To clear the LED, the device has to be
reset either manually or via SW2.

2.1.5 Interrupt Source

Some microprocessors only recognize falling edge interrupts; others only
recognize rising edge interrupts whereas others may be programmed to
recognize either. By using W11, the user can choose either rising edge
interrupts or falling edge interrupts.

Board-Level Control

2.1.6 Base Address

The EVM can be mapped into a memory location by setting one of four
possible base addresses. The base address is set by J8. When the logic state
of the two external address signals matches the logic state setup by the two
jumpers on J8 and the access is a valid memory access, the EVM generates
a CS signal for the ADC. This can then be further qualified as a read cycle or
a write (RESET) cycle.

2.1.7 Base Address and Chip Select

An installed jumper is equivalent to logic 0 on the corresponding address line.
An uninstalled jumper is equivalent to logic 1 on the corresponding address
line.

The TMS320C6711 DSK provides two memory spaces for daughter boards.
The two memory-space enables (CE2 and CE3) are buffered versions of the
DSP outputs and are not generated by decode logic on the DSK. The 5−6K
EVM uses CE2 to indicate that the access is valid. This places the daughter
card at an address space beginning at A0000000.

Digital Interface

2-3

External Interface

Table 2−4.Memory Space Address

J8

1−2 3−4

0 0 0xA0000000
0 1 0xA0000004
1 0 0xA0000008
1 1 0xA000000C

Address Selected

2.2 External Interface

The pinout for the EVM has been arranged to easily mate with a growing range
of interface adapters. The premise of this arrangement is to ensure a high
degree of modularity without committing the EVM to be used in only one
particular platform. The interface card that is available at this time is the 5−6K
interface card http://focus.ti.com/lit/ug/slau104/slau104.pdf. This card
enables any TMS320C5000 DSP Platform or TMS320C6000 DSP
Platform-based DSK with standard expansion connectors to connect to the
EVM. Figure 2−1 shows the arrangement of DSK, interface card, and EVM.

Figure 2−1.Arrangement of DSK, Interface Card and EVM

ADS1625/26 EVM

5−6K Interface Card

DSK Platform

For interfaces to other platforms, such as C2000 DSP and programmable
logic systems, contact the PIC.

2-4

2.3 Data Connector Pinout

The data from the ADC is available at J2/P2. The assignment and function of
each pin is given in Table 2−5.

Table 2−5.Assignment and Function at J2/P2

Pin Number Function Pin Number Function

1 D00 2 IO Ground
3 D01 4 IO Ground
5 D02 6 IO Ground
7 D03 8 IO Ground
9 D04 10 IO Ground
11 D05 12 IO Ground
13 D06 14 IO Ground
15 D07 16 IO Ground
17 D08 18 IO Ground
19 D09 20 IO Ground
21 D10 22 IO Ground
23 D11 24 IO Ground
25 D12 26 IO Ground
27 D13 28 IO Ground
29 D14 30 IO Ground
31 D15 32 IO Ground
33 D16 34 IO Ground
35 D17 36 IO Ground
37 Not Connected 38 IO Ground
39 Not Connected 40 IO Ground

Data Connector Pinout

2.3.1 Control Connector Pinout

The ADC is controlled by the signals that originate from J3/P3. The assignment
and function of each pin is given in Table 2−6.

Table 2−6.Assignment and Function at J3/P3

Pin Number Function Pin Number Function

1 CS 2 IO Ground
3 WR 4 IO Ground
5 RD 6 IO Ground
7 Not Connected 8 IO Ground
9 Not Connected 10 IO Ground
11 A2 12 IO Ground
13 A3 14 IO Ground
15 Not Connected 16 IO Ground
17 Not Connected 18 IO Ground
19 DRDY_OUT 20 IO Ground

Digital Interface

2-5

2-6

The ADS1625/26EVM board requires various power sources for operation.

- A dual ±6-V dc supply

- Two 5-V dc supply

- A single 3-V dc supply

- A single 8-V – 40-V dc supply

The simplest way to provide these voltages is to use the power connector
P4/J4 and derive the voltages elsewhere, preferably via linear supplies.

The pinout for this connector is shown in Table 3−1.

Table 3−1.Power Connector P4/J4

Chapter 3

Power Distribution

Signal P4/J4 Pin Number Signal

+VA 1 2 −VA

+5VA 3 4 −5VA

AGND 5 6 DGND
+1.8VD 7 8 VD1
+3.3VD 9 10 +5VD

Should the user decide to use a TI DSK, the digital requirements can be
supplied by the DSK.

Power Distribution

3-1

3-2

Chapter 4

Getting the Most From Your EVM

Generally, the user can take two hardware directions with the EVM.

Topic Page

4.1 Stand-Alone EVM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 DSP Interface 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting the Most From Your EVM

4-1

Stand-Alone EVM

4.1 Stand-Alone EVM

The EVM can be used on its own. Using the EVM in this manner obliges the
user to provide a custom digital interface between the EVM and a host system.
Users are responsible for ensuring that proper timing requirements are met in
addition to providing any glue logic necessary. Users must also provide the
necessary analog interface and supply power to the EVM.

4.2 DSP Interface

Depending on the DSP that the user chooses, a number of TI DSKs are
available. DSKs are DSP Starter Kits, and provide users with a DSP starter
system. They contain all the necessary hardware and software to quickly
begin prototype construction.

4.2.1 TMS320C6711 Interface

4.2.1.1 Example Program

This section is a step-by-step description of how to use one of the example
programs supplied. The goal of the program is to display the digitized analog
input of the ADS1625 on the PC, as shown in Figure 4−7.

The hardware is setup as follows:

- TMS320C6711 DSK

- 5−6K Interface card

- ADS1625 EVM

Given this configuration, the hardware is assembled as shown in Figure 2.1.
The example program uses the driver files created with the Data Converter

Plug-in of Code Composer Studio, which can be downloaded from the TI
website at http://www.ti.com/sc/dcplug−in . For the example programs
available with the ADS1625 EVM, the plug-in is not needed, as all the files are
provided.

The program itself performs the following steps:

- Initialization of global variables by calling the function dc_configure() with

the settings of the ADS1625. These settings are stored in the Ads1605_1
data structure (defined in the file t1625_fn.h) which contains the
information about the physical address of the converter, the interrupt in
use and its polarity and other settings used by the driver. If the initialization
fails for any reason, an error message appears in the stdout window of
Code Composer Studio.

- Enabling of the interrupts of the DSP.

- Reading a block of data from the ADS1625 by calling the dc_rblock()

function (residing in the file t1625_ob.c) with the settings of the ADS1625,
the address of the memory block where the date should be written to and
the block size. Once the transfer is complete, the semaphore
Ads1625_1.xferInProgress is reset and a new transfer is initiated.

4-2

In order to get the expected result, the following steps need to be performed.

- Make sure that the jumpers on the 5−6K interface card are set according

to the following Table 4−1 and Figure 4−1.

Table 4−1.Jumper Settings for J13 and J14 on the 5−6K Interface Card

DSP Interface

Reference Designator

W1 Installed
W2 Not Installed Installed
W3 Not Installed Installed
W4 Not Installed Installed
W5 Not Installed Installed
W6 Installed Not Installed

1−2 2−3

Position

Figure 4−1.Jumper Settings for J13 and J14 on the 5 −6K Interface Card

J14

J13

- Make sure that all jumpers on the ADS1625/1626 EVM are set to the

factory defaults, as described in the Chapters 1 and 2 of this User’s Guide.
Additionally, set the jumper W11 to position 2−3 to configure the interrupt

for the rising edge. As described in Chapter 2, paragraph 2.1.5.

- Apply power to the DSP starter kit and also to the EVM, as described in

Chapter 3.

- Apply an analog signal on either J6 or pin 4 of J1. For example, apply a

10-kHz sine wave with 1 Vpp and 0-V offset.

- Start Code Composer Studio (CCS).

- In Code Composer Studio, open the project for your DSP hardware plat-

form by clicking on Project −> Open on Code Composer Studios menu bar
and loading the respective project for your hardware/ starter kit from the
path, where you copied the example projects to:

J For the TMS320VC5510 DSK: Open ADS1625−C5510.pjt
J For the TMS320C6711 DSK: Open ADS1625−C6711.pjt
J For the TMS320C6713 DSK: Open ADS1625−C6713.pjt
J For the TMS320C6416 DSK: Open ADS1625−C6414.pjt

Getting the Most From Your EVM

4-3

DSP Interface

Figure 4−2.CCS Project Menu

Figure 4−3.CCS Project Open Dialog

- Once the project is open, expand the project tree by clicking on the (+) in

front of it and expand the source files as well. The project window should
look like the one in Figure 4−4.

4-4

Figure 4−4.CCS Project View

- Next, load the executable program provided into the DSP by clicking on

File " Load Program and selecting the file ADS1625−CXXXX.out from

the Debug submenu, where the XXXX in the filename stands for the plat­form you use (5510, 6711, 6713, 6416).

DSP Interface

- Now open the main.c source file by double-clicking on the file name in the

project view and scroll down to the line, where the read command for the
ADS1625 is issued (dc_rblock() function). This line reads:

/* issue a read block command to the converter */

dc_rblock(&Ads1625_1, /* data converter object */

r_buffer, /* address of the target buffer */

BUFFER_SIZE, /* size of the target buffer */

0); /* no callback function */

- Set the cursor in front of the dc_rblock() command and right click in this

line. A new pop-up menu opens; select Insert Graph.

Getting the Most From Your EVM

4-5

DSP Interface

Figure 4−5.CCS Context Menu

4-6

- With this done, a new dialog window with the properties of the graph

appears. Here, a few values must be entered, whereas most of the
settings can be left in the default position:

J Start Address: This is the starting location of the acquisition buffer

containing the data to be graphed. When the graph is updated, the ac­quisition buffer, starting at this location, is fetched from the target
board. This acquisition buffer then updates the display buffer, which is
graphed. In the case of the sample program, set it to r_buffer.

J Acquisition Buffer Size: This is the size of the acquisition buffer you

are using on your target board. In the case of the sample program, the
size of the r_buffer is defined with the symbol BUFFER_SIZE in the
main.c file and should be set to 1024 in the dialog window.

J Display Data Size: This is the size of the display buffer that you use.

The contents of the display buffer are graphed on your screen. The
display buffer resides on the host, so a history of your signal can be
displayed even though it no longer exists on the target board. When
using the sample program, set it to 1024 as well.

J DSP Data Type: Select 16−bit signed integer from the drop-down list.

J Sampling Rate (Hz): This field contains the sampling frequen-

cy for acquisition buffer samples, such as for analog to digital
conversion. The sampling rate is used to calculate the time and
frequency values displayed on the graph. For a time domain
graph, this field calculates the values for the time axis. The axis
is labeled from 0 to (Display Data Size × 1/Sampling Rate). For
the sample program, set it to 5000000 (5 MHz).

More information on the different settings can be found in the help file
of Code Composer Studio.

Once all settings are entered, click on the OK button to close the dialog.
The graph window appears, currently with no useful values, as the
program has not started yet.

Figure 4−6.CCS Graph Property Windows

DSP Interface

- Start the program by pressing the <F5> key on your keyboard. After a

short time, the graph window should be updated to show the waveform of
the analog signal (see Figure 4−7).

Getting the Most From Your EVM

4-7

DSP Interface

Figure 4−7.CCS Window With Graph

4-8

Chapter 5

EVM BOM, ADS1625/26 EVM Layouts, and

Schematics

This chapter contains the bill of material, EVM layouts, and the schematics for
the ADS1625/26.

Topic Page

5.1 EVM Bill of Materials 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 ADS1625/26 EVM Layout Details 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 ADS1625/26 EVM Schematics 5-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-1

EVM Bill of Materials

C73, C75

5.1 EVM Bill of Materials

The following tables contains a complete Bill of Materials for the
ADS1625 and ADS1626 EVM.

Table 5−1.ADS1625 Bill of Materials

Qty Value Ref Des Description Vendor Part number

5 0.001 µF C6, C9, C16,

4 0.01 µF C1, C22, C28,

6 0.01 µF C8, C10, C21,

4 0.1 µF C39, C40,

1 0.01 µF C56 Capacitor 0.01 µF 25 V

32 0.1 µF C12, C14

C17, C66

C58

C23, C25,
C64

C41, C53

C15, C38

C15, C38
C44, C46

C44, C46
C49, C50C49, C50
C57, C65C57, C65
C67, C70C67, C70
C73, C75
C76, C78
C80, C81
C89, C93
C95, C97
C98, C100
C102, C103
C104, C105
C106, C107
C108, C112

Capacitor ceramic 1000 pF
5% 50 V NP0 0603

Capacitor 10000 pF 50 V
ceramic X7R 0603

Capacitor 10000 pF 200 V
ceramic X7R 0805

Capacitor 0.1 µF 10 V
ceramic X5R 0402

ceramic X7R 0402
Capacitor 0.1 µF 25 V

ceramic X7R 0603

ceramic X7R 0603

AVX Corporation 06035A102JAT2A

Kemet C0603C103J5RACTU

Panasonic ECJ-2YB2D103K

Panasonic ECJ-0EB1A104K

Panasonic ECJ-0EB1E103K

Panasonic ECJ-1VB1E104K

5 0 R R5, R11, R34,

R35, R40

2 1 K R38, R39 Resistor 1.00 kΩ 1/10W 1%

10 1 µF C45, C47,

C51, C52,
C79, C86,
C87, C90,
C94, C101

15 1 µF C5, C7, C20,

C24, C32,
C34, C37,
C61, C62,
C88, C91,
C99, C109,
C110, C111

1 1 µF C54 Capacitor 1 µF 50 V ceramic

1 2.2 R R44 Resistor 2.2 Ω 1/4W 5%

5-2

Resistor 0 Ω 1/16W 5%
0402 SMD

0805 SMD
Capacitor 1.0 µF 16 V

ceramic X5R 0603

Capacitor 1 µF 16 V ceramic
0805 X5R

X5R 1210

1206

Panasonic - ECG ERJ-2GE0R00X

Panasonic ERJ-6ENF1001V

Panasonic ECJ-1VB1C105K

Panasonic ECJ-2FB1C105K

Panasonic ECJ-4YB1H105K

Panasonic ERJ-8GEYJ2R2V

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

1 2.2 µF C3 Capacitor ceramic 2.2 µF

1 W6 2 Position jumper _ 0.1”

2 3.01 K R2, R19 SMD thin film chip resistor

10 W1, W2, W3,

W4, W5, W7,
W8, W9, W10,
W11

3 4.7 µF C42, C48,

C85

2 4.12 K R3, R18 Thin film chip resistor, 0805

2 5 K RV1, RV3 Trimpot 5 kΩ 4 MM top adj

1 J4 2 x 5 x 0.1 SMT square post

1 P4 5 x 2 x 0.1 SMT connector Samtec SSW-105-22-F-D-VS-K
1 9.09 K R1 0805 SMD thin film chip

1 10 K RP6 Resnet 16 pos isolat 10 kΩ

7 10 K R4, R20, R36,

R43, R45,
R48, R49

1 10 K RV2 Trimpot 10 kΩ 4 MM top adj

9 10 µF C11, C18,

C27, C30,
C59, C60,
C71, C72,
C84

4 10 µF C2, C4, C29,

C31

1 10 µF C55 Capacitor 10 µF 50 V

1 10 µF C43 Capacitor TANT 10 µF 10 V

1 12.1 K R24 0805 SMD thin film chip

2 22 pF C13, C19 Capacitor ceramic 22 pF

3 22 µF C26, C82,

C83

1 22 µF C68 Capacitor TANT 22 µF

5 33 R RP1, RP2,

RP3, RP4,
RP5

10 V X5R 080

spacing

0805 3.01 K 0.1% 25 PPM
3-position jumper Samtec TSW-103-07-L-S

Capacitor 4.7 µF/10 V
TEH SER SMD

4.12 K 0.1% 25 PPM

SMD

header

resistor 9.09 K 0.1% 25 PPM

SOIC
Resistor 10 kΩ 1/8 W 5%

0805 SMD

SMD
Capacitor 10 µF 10 V

ceramic F 0805

Capacitor 10 µF 16 V
ceramic X5R 1206

ceramic F 1210

20% SMT

resistor 12.1K 0.1% 25 PPM

50 V NP0 0805
Capaciator 22 µF 6.3 V

ceramic X5R 1206

10 V 20% SMD
Resistor array 33 Ω

8-terminal 4-resistor SMD

Panasonic ECJ-2FB1A225K

Samtec TSW-102-07-L-S

KOA Speer RN732ALTD3011B25

Panasonic ECS-H1AX475R

KOA Speer RN732ALTD4121B25

Bourns 3224W-1-502E

Samtec TSM-105-01-T-DV-P

KOA Speer RN732ALTD9091B25

Bourns 2NBS16-TJ1-103

Panasonic ERJ-6GEYJ103V

Bourns Inc 3224W-1-103E

Panasonic ECJ-2FF1A106Z

Panasonic ECJ-3YB1C106M

Panasonic ECJ-4YF1H106Z

Kemet T494B106M010AS

KOA Speer RN732ALTD1212B25

BC Components 0805N220J500NT

Panasonic ECJ-3YB0J226M

Kemet T494A226M010AS

CTS Corporation 742C083330JTR

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-3

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

1 36.5 K R33 Resistor 36.5 kΩ 1/10W 1%

1 J2 2 x 20 x 0.1 SMT square

1 P2 2 x 20 x 0.1 SMT Samtec SSW-120-22-F-D-VS-K
6 47 µF C63, C69,

C74, C77,
C92, C96

4 49.9 R R14, R31,

R32, R42

1 100 R R50 Resistor 100 Ω 1/10W 5%

2 100 pF C33, C35 Capacitor ceramic 100 pF

1 130 K R47 Resistor 130 kΩ 1/8W 5%

1 169 K R46 Resistor 169 kΩ 1/10W 1%

4 220 µH L1, L2, L3, L4 Inductor 220 µH 10% SA

1 390 pF C36 Capacitor ceramic 390 pF

17 392 R R6, R7, R8,

R9, R10, R12,
R13, R17,
R21, R22,
R23, R25,
R26, R27,
R28, R29,

R30
1 ADS1625 PWB 6455115
1 U6 IC 16 Bit 1.25 MSPS ADC

1 SW1 Switch dip 8 pos halh pitch

2 J1, J3 2 x 10 x 0.1 SMT Samtec SSW-110-22-F-D-VS-K
2 P1, P3 2 x 10 x 0.1 SMT square

1 J8 2 x 2 x 0.1 SMT square post

2 R15, R16 Resistor 0 Ω 1/16W 5%

3 U2, U3, U4 IC dual wdband op amp

1 X1 Oscillator, 40 MHz low jitter Vapley Fisher

1 U1 IC +5 V voltage reference

1 J7 2-pole screw terminal

0805 SMD

post header

Capacitor 47 µF 16 V
tantalum TE SMD

Resistor 49.9 Ω 1/10W 1%
SMD 0603

0603 SMD

50V NP0 0805

0805 SMD

0805 SMD

Type SMD

50V NP0 0805
0805 Resistor 0.1%

tolerance 10 PPM 392 R

64-TQFP

SMT

post header

header

0402 SMD

8-VSSOP

8-SOIC

3,5 mm pitch black

Panasonic ERJ-6ENF3652V

Samtec TSM-120-01-T-DV

Panasonic ECS-T1CD476R

Yageo America 9T06031A49R9FBHFT

Panasonic ERJ-3GEYJ101V

BC Components 0805N101J500NT

Panasonic ERJ-6GEYJ134V

Panasonic ERJ-6ENF1693V

Panasonic - ECG ELJ-SA221KF

BC Components 0805N391J500NT

Holsworthy 279-RN73CA-392R

Texas Instruments ADS1625IPAPT

ITT Industries TDA08H0SK1

Samtec TSM-110-01-T-DV-P

Samtec TSM-102-01-T-DV

Panasonic-ECG ERJ-2GE0R00X

Texas Instruments OPA2822U

Corporation
Texas Instruments REF02BU

On Shore
Technology

VF3 SH-40

ED-555-2-BK

5-4

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

2 J5, J6 Right angle SMA connector Johnson

1 D1 Red LED, SMT 1206 Chicago Miniature

2 U10, U15 IC single inverter gate

1 U5 IC SGL 2 in pos-or gate

2 U7, U9 IC SGL 2 in ex-or gate

1 U11 IC quad 2-in pos-or gate

1 U8 IC dual edg-trg DTYP F-F

3 U12, U13,

U14

1 SW2 Switch LT touch 6 X 3.5

2 AIN, TP1,

TP2, TP3,
TP4, VREF

2 AGND

IO_GND

1 U16 Silicon transistor NPN Infineon SMBT3906INCT-ND

SOT23-5

SOT23-5

SOT23-5

14TSSOP

14TSSOP
Octal buffers/drivers with

3-state outputs

240GF SMD
SMT test point Keystone

Turret terminal test point Cambion 180-7337-02-05

Components Inc.

Lamp Co.
Texas Instruments SN74AHC1G04DBVR

Texas Instruments SN74AHC1G32DBVR

Texas Instruments SN74AHC1G86DBVR

Texas Instruments SN74AHC32PWR

Texas Instruments SN74AHC74PWR

Texas Instruments SN74AHC541PWR

Panasonic EVQ-PJU04K

Electronics

142-0701-301

CMD15-21VRC/TR8

5015

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-5

EVM Bill of Materials

C73, C75

Table 5−2.ADS1626 Bill of Materials

Qty Value Ref Des Description Vendor Part number

5 0.001 µF C6, C9, C16,

4 0.01 µF C1, C22, C28,

6 0.01 µF C8, C10, C21,

4 0.1 µF C39, C40,

1 0.01 µF C56 Capacitor 0.01 µF 25 V

32 0.1 µF C12, C14

C17, C66

C58

C23, C25,

C64

C41, C53

C15, C38

C15, C38

C44, C46

C44, C46

C49, C50C49, C50

C57, C65C57, C65

C67, C70C67, C70

C73, C75

C76, C78

C80, C81

C89, C93

C95, C97

C98, C100

C102, C103

C104, C105

C106, C107

C108, C112

Capacitor ceramic 1000 pF
5% 50 V NP0 0603

Capacitor 10000 pF 50 V
ceramic X7R 0603

Capacitor 10000 pF 200 V
ceramic X7R 0805

Capacitor 0.1 µF 10 V
ceramic X5R 0402

ceramic X7R 0402
Capacitor 0.1 µF 25 V

ceramic X7R 0603

ceramic X7R 0603

AVX Corporation 06035A102JAT2A

Kemet C0603C103J5RACTU

Panasonic ECJ-2YB2D103K

Panasonic ECJ-0EB1A104K

Panasonic ECJ-0EB1E103K

Panasonic ECJ-1VB1E104K

5 0 R R5, R11, R34,

R35, R40
2 1 K R38, R39 Resistor 1.00 kΩ 1/10W 1%

10 1 µF C45, C47,

C51, C52,

C79, C86,

C87, C90,

C94, C101
15 1 µF C5, C7, C20,

C24, C32,

C34, C37,

C61, C62,

C88, C91,

C99, C109,

C110, C111
1 1 µF C54 Capacitor 1 µF 50 V ceramic

1 2.2 R R44 Resistor 2.2 Ω 1/4W 5%

1 2.2 µF C3 Capacitor ceramic 2.2 µF

1 W6 2 Position jumper _ 0.1”

2 3.01 K R2, R19 SMD thin film chip resistor

Resistor 0 Ω 1/16W 5%
0402 SMD

0805 SMD
Capacitor 1.0 µF 16 V

ceramic X5R 0603

Capacitor 1 µF 16 V ceramic
0805 X5R

X5R 1210

1206

10 V X5R 080

spacing

0805 3.01 K 0.1% 25 PPM

Panasonic - ECG ERJ-2GE0R00X

Panasonic ERJ-6ENF1001V

Panasonic ECJ-1VB1C105K

Panasonic ECJ-2FB1C105K

Panasonic ECJ-4YB1H105K

Panasonic ERJ-8GEYJ2R2V

Panasonic ECJ-2FB1A225K

Samtec TSW-102-07-L-S

KOA Speer RN732ALTD3011B25

5-6

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

10 W1, W2, W3,

W4, W5, W7,
W8, W9, W10,
W11

3 4.7 µF C42, C48,

C85

2 4.12 K R3, R18 Thin film chip resistor, 0805

2 5 K RV1, RV3 Trimpot 5 kΩ 4 MM top adj

1 J4 2 x 5 x 0.1 SMT square post

1 P4 5 x 2 x 0.1 SMT connector Samtec SSW-105-22-F-D-VS-K
1 9.09 K R1 0805 SMD thin film chip

1 10 K RP6 Resnet 16 pos isolat 10 kΩ

7 10 K R4, R20, R36,

R43, R45,
R48, R49

1 10 K RV2 Trimpot 10 kΩ 4 MM top adj

9 10 µF C11, C18,

C27, C30,
C59, C60,
C71, C72,
C84

4 10 µF C2, C4, C29,

C31

1 10 µF C55 Capacitor 10 µF 50 V

1 10 µF C43 Capacitor TANT 10 µF 10 V

1 12.1 K R24 0805 SMD thin film chip

2 22 pF C13, C19 Capacitor ceramic 22 pF

3 22 µF C26, C82,

C83

1 22 µF C68 Capacitor TANT 22 µF

5 33 R RP1, RP2,

RP3, RP4,
RP5

1 36.5 K R33 Resistor 36.5 kΩ 1/10W 1%

1 J2 2 x 20 x 0.1 SMT square

1 P2 2 x 20 x 0.1 SMT Samtec SSW-120-22-F-D-VS-K

3-position jumper Samtec TSW-103-07-L-S

Capacitor 4.7 µF/10 V
TEH SER SMD

4.12 K 0.1% 25 PPM

SMD

header

resistor 9.09 K 0.1% 25 PPM

SOIC
Resistor 10 kΩ 1/8 W 5%

0805 SMD

SMD
Capacitor 10 µF 10 V

ceramic F 0805

Capacitor 10 µF 16 V
ceramic X5R 1206

ceramic F 1210

20% SMT

resistor 12.1K 0.1% 25 PPM

50 V NP0 0805
Capaciator 22 µF 6.3 V

ceramic X5R 1206

10 V 20% SMD
Resistor array 33 Ω

8-terminal 4-resistor SMD

0805 SMD

post header

Panasonic ECS-H1AX475R

KOA Speer RN732ALTD4121B25

Bourns 3224W-1-502E

Samtec TSM-105-01-T-DV-P

KOA Speer RN732ALTD9091B25

Bourns 2NBS16-TJ1-103

Panasonic ERJ-6GEYJ103V

Bourns Inc 3224W-1-103E

Panasonic ECJ-2FF1A106Z

Panasonic ECJ-3YB1C106M

Panasonic ECJ-4YF1H106Z

Kemet T494B106M010AS

KOA Speer RN732ALTD1212B25

BC Components 0805N220J500NT

Panasonic ECJ-3YB0J226M

Kemet T494A226M010AS

CTS Corporation 742C083330JTR

Panasonic ERJ-6ENF3652V

Samtec TSM-120-01-T-DV

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-7

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

6 47 µF C63, C69,

C74, C77,

C92, C96
4 49.9 R R14, R31,

R32, R42
1 100 R R50 Resistor 100 Ω 1/10W 5%

2 100 pF C33, C35 Capacitor ceramic 100 pF

1 130 K R47 Resistor 130 kΩ 1/8W 5%

1 169 K R46 Resistor 169 kΩ 1/10W 1%

4 220 µH L1, L2, L3, L4 Inductor 220 µH 10% SA

1 390 pF C36 Capacitor ceramic 390 pF

17 392 R R6, R7, R8,

R9, R10, R12,

R13, R17,

R21, R22,

R23, R25,

R26, R27,

R28, R29,

R30
1 ADS1626 PWB 6455115
1 U6 IC 16 Bit 1.25 MSPS ADC

1 SW1 Switch dip 8 pos halh pitch

2 J1, J3 2 x 10 x 0.1 SMT Samtec SSW-110-22-F-D-VS-K
2 P1, P3 2 x 10 x 0.1 SMT square

1 J8 2 x 2 x 0.1 SMT square post

2 R15, R16 Resistor 0 Ω 1/16W 5%

3 U2, U3, U4 IC dual wdband op amp

1 X1 Oscillator, 40 MHz low jitter Vapley Fisher

1 U1 IC +5 V voltage reference

1 J7 2-pole screw terminal

2 J5, J6 Right angle SMA connector Johnson

1 D1 Red LED, SMT 1206 Chicago Miniature

2 U10, U15 IC single inverter gate

Capacitor 47 µF 16 V
tantalum TE SMD

Resistor 49.9 Ω 1/10W 1%
SMD 0603

0603 SMD

50V NP0 0805

0805 SMD

0805 SMD

Type SMD

50V NP0 0805
0805 Resistor 0.1%

tolerance 10 PPM 392 R

64-TQFP W FIFO

SMT

post header

header

0402 SMD

8-VSSOP

8-SOIC

3,5 mm pitch black

SOT23-5

Panasonic ECS-T1CD476R

Yageo America 9T06031A49R9FBHFT

Panasonic ERJ-3GEYJ101V

BC Components 0805N101J500NT

Panasonic ERJ-6GEYJ134V

Panasonic ERJ-6ENF1693V

Panasonic - ECG ELJ-SA221KF

BC Components 0805N391J500NT

Holsworthy 279-RN73CA-392R

Texas Instruments ADS1626IPAPT

ITT Industries TDA08H0SK1

Samtec TSM-110-01-T-DV-P

Samtec TSM-102-01-T-DV

Panasonic-ECG ERJ-2GE0R00X

Texas Instruments OPA2822U

Corporation
Texas Instruments REF02BU

On Shore
Technology

Components Inc.

Lamp Co.
Texas Instruments SN74AHC1G04DBVR

VF3 SH-40

ED-555-2-BK

142-0701-301

CMD15-21VRC/TR8

5-8

EVM Bill of Materials

Qty Part numberVendorDescriptionRef DesValue

1 U5 IC SGL 2 in pos-or gate

2 U7, U9 IC SGL 2 in ex-or gate

1 U11 IC quad 2-in pos-or gate

1 U8 IC dual edg-trg DTYP F-F

3 U12, U13,

U14

1 SW2 Switch LT touch 6 X 3.5

2 AIN, TP1,

TP2, TP3,
TP4, VREF

2 AGND

IO_GND

1 U16 Silicon transistor NPN Infineon SMBT3906INCT-ND

SOT23-5

SOT23-5

14TSSOP

14TSSOP
Octal buffers/drivers with

3-state outputs

240GF SMD
SMT test point Keystone

Turret terminal test point Cambion 180-7337-02-05

Texas Instruments SN74AHC1G32DBVR

Texas Instruments SN74AHC1G86DBVR

Texas Instruments SN74AHC32PWR

Texas Instruments SN74AHC74PWR

Texas Instruments SN74AHC541PWR

Panasonic EVQ-PJU04K

5015

Electronics

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-9

ADS1625/26 EVM Layout Details

5.2 ADS1625/26 EVM Layout Details

Figure 5−1.Top Tracking Layer

5-10

Figure 5−2.Internal Power and Ground Layers

ADS1625/26 EVM Layout Details

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-11

ADS1625/26 EVM Layout Details

Figure 5−3.Bottom Tracking Layer

5-12

5.3 ADS1625/26 EVM Schematics

The schematics are shown on the following pages.

ADS1625/26 EVM Schematics

EVM BOM, ADS1625/26 EVM Layouts, and Schematics

5-13

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

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Block Diagram.Sch

DOCUMENTCONTROL #

1
3
5
7
9
11
13

17
19

2
4
6

8
10
12
14
16
18
20

15

J3/P3

HEADER 10 X 2

AIN

AIN_N

AINN

VCM

AINP

Analog Input

EXT_CLK

AINP

AINN

B00
B01
B02
B03
B04

B17

B16

B15

B05
B06
B07
B08
B09
B10
B11
B12
B13
B14

VREFN

VMID

VREFP

B_OTR

B_DRDY

REFEN*

RD*

BDSEL*

RESET*

PD*

SEL_FIFO(0)
SEL_FIFO(1)
SEL_FIFO(2)

CLK

ADS1605_CS*

ADS1625_26

+12v

VCM

VMID

VREFN

VREFP

Voltage Reference

D09

D08

D11

D10

D12
D13

D15

D14

D16
D17

B00
B01
B02
B03
B04
B05
B06
B07
B08
B09
B10
B11
B12
B13
B14
B15
B16
B17

B_OTR

B_DRDY

OTR

DRDY

D00
D01
D02
D03
D04
D05
D06
D07

Data bus buffers

REFEN*

PD*

RESET*

BDSEL*

RD*

SEL_FIFO(2)

SEL_FIFO(1)

SEL_FIFO(0)

CLK

ADS1605_CS*

Interface (2 of 2)

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40

J2/P2

40-PIN HEADER

Power

1

2 3 4 5

J5

IO_GND

IO_GND

1

2

J7

DRDY
OTR

HOST_A2
HOST_A3

DRDY_OUT

HOST_RD*

HOST_CSa*
HOST_WR*

Interface (1 of 2)

IO_GND

1
3
5
7
9
11
13

17
19

2
4
6

8
10
12
14
16
18
20

15

J1 / P1

W3

W4

W2

VCOM

REF­REF+

REF-

REF+

VCOM

R16

NI

R15

NI

AGND

AGND

R5

0R

R11

0R

ADS1625 / 26 Block Diagram
Joe Purvis
Joe Purvis

6455116 A

1 7

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

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ADS1625_26.Sch

DOCUMENTCONTROL #

MOD_AGND

VREFP

VREFN

R42

49.9R

AINN
AINP

MOD_AVDD

REFEN*

R33

36.5K

PD*

RESET*

ADS1605_CS*

RD*

1 8
2 7
3 6
4 5

RP5

33R

1 8
2 7
3 6
4 5

RP4

33R

1 8
2 7
3 6
4 5

RP3

33R

1 8
2 7
3 6
4 5

RP2

33R

1 8
2 7
3 6
4 5

RP1

33R

B00

B01

B02

B03

B04

B05

B06

B07

B08

B09

B10

B11

B12

B13

B14

B15

B16

B17

SEL_FIFO(0)

B_DRDY

B_OTR

SEL_FIFO(1)

SEL_FIFO(2)

DVDD3.0V

DVDD3.0V

IO_GND

VMID

IOVDD

IO_GND

AVDD

EXT_CLK

W7

CLK

4

2

3

1

X1

R48
10K

C80

0.1uF

C90

1uF

C78

0.1uF

C79

1uF

C81

0.1uF

C86

1uF

C89

0.1uF

C87

1uF

AVDD

AVDD

AVDD

C95

0.1uF
C94

1uF

DVDD3.0V

C44

0.1uF
C45

1uF

OTR

DRDY

OTR

DRDY

C46

0.1uF

C47

1uF

C49

0.1uF

C51

1uF

C50

0.1uF

C52

1uF

C72

10uF

C76

0.1uF

C84

10uF

C73

0.1uF

C67

0.1uF

C75

0.1uF

C38

0.1uF

L4
220uH

R44

2.2R

C98

0.1uF

C26
22uF

C82

22uF

C83
22uF

C71

10uF

IO_GND

IO_GND

IOVDD

IOVDD

C101
1uF

IO_GND

DGND DGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

1

AVDD

2

AGND

3

AINN

4

AINP

5

AGND

6

AVDD

7

RBIAS

8

AGND

9

AVDD

10

AGND

11

AVDD

12

REFEN

13

IOVDD

14

DGND

15

NC

16

PD17DVDD18DGND19RESET20CS21RD22OTR23DRDY24DGND25DVDD26DOUT[00]27DOUT[01]28DOUT[02]29DOUT[03]30DOUT[04]31DOUT[05]

32

DOUT[06]

33

DOUT[07]

34

DOUT[08]

35

DOUT[09]

36

DOUT[10]

37

DOUT[11]

38

DOUT[12]

39

DOUT[13]

40

DOUT[14]

41

DOUT[15]

42

DOUT[16]

43

DOUT[17]

44

FIFO_LEV[0]

46

FIFO_LEV[1]

47

FIFO_[LEV2]

48

N/C49N/C

50

N/C

45

DGND51DVDD

52

IOVDD

53

DGND54AGND

55

CLK

56

AGND57AVDD

58

VCAP

59

VREFN60VREFN

61

VMID

62

VREFP63VREFP

64

U6

ADS1625 / 26

AGND

IOVDD

IO_GND

ADS1625 / 26
Joe Purvis
Joe Purvis

6455116 A

2 7

1 2 3 4 5 6

A

B

C

D

654321

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C

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A

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DOCUMENTCONTROL #

3

2

1

8

4

U4A

OPA2822U

6
5

7

U4B

OPA2822U

C13

22pF

C15

0.1uF

+6V

C64

.01uF

-6V

C14

0.1uF

C19

22pF

AINP

AINN

C36

390pF

R38
1K

R39
1K

+

C68
22uF

C65

0.1uF

VCM

R31

49.9R

R32

49.9R

C35

100pF

C33

100pF

AIN

R12
392

R17
392

R22
392

R13
392

R28

392

AIN

1

2 3 4 5

J6

C11

10uF

C18

10uF

R14

49.9R

W1

W5

AIN

AIN_N

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

C25

.01uF

ADS1625 / 26 Analog Input
Joe Purvis
Joe Purvis

6455116 A

3 7

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

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DOCUMENTCONTROL #

VIN

2

GND

4

OUT

6

TRIM

5

TEMP

3

N/C

1

N/C7N/C

8

U1

REF02

C3

2.2uF

C54

1uF

C57

0.1uF

C56

0.01uF

C12

0.1uF

R3

4.12K

R4
10K

RV1
5K

RV3
5K

R1

9.09K

R2

3.01K

R18

4.12K

R6
392

R8
392

C62

1uF

C58

.01uF

C20

1uF

R7
392

+6V

-6V

C5

1uF

C29
10uF

R21
392

R9
392

C9

.001uF

C24

1uF

R10
392

+6V

-6V

R23
392

R29
392

VREFP

VREFN

C60
10uF

6
5

7

U3B

OPA2822U

6
5

7

U2B

OPA2822U

R24

12.1K

R19

3.01K

R25

392

R30

392

TO ANALOG INPUT CIRCUIT

VMID

3

2

1

8

4

U3A

OPA2822U

3

2

1

8

4

U2A

OPA2822U

RV2
10K

VCM

W6

+12v

C61

1uF

C59
10uF

C34

1uF

C30
10uF

C32

1uF

C27
10uF

C4
10uF

C7

1uF

C16

.001uF

R26
392

C1

.01uF

C28

.01uF

C22

.01uF

C6

.001uF

C17

.001uF

R27

392

C55

10uF

C31

10uF

C2

10uF

R20
10K

VREF

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

C23
.01uF

C21

.01uF

C8

.01uF

C10
.01uF

ADS1625 / 26 Voltage Reference
Joe Purvis
Joe Purvis

6455116 A

4 7

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

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DOCUMENTCONTROL #

C111
1uF

B_OTR

B_DRDY

B01

B02

B03

B04

B05

B06

B07

B08

B09

B10

B11

B12

B13

B14

B15

B16

B17

OE1

1

A1

2

A2

3

A3

4

A4

5

A5

6

A6

7

A7

8

A8

9

GND10Y8

11

Y7

12

Y6

13

Y5

14

Y4

15

Y3

16

Y2

17

Y1

18

OE2

19

VCC

20

U12

SN74AHC541

OE1

1

A1

2

A2

3

A3

4

A4

5

A5

6

A6

7

A7

8

A8

9

GND10Y8

11

Y7

12

Y6

13

Y5

14

Y4

15

Y3

16

Y2

17

Y1

18

OE2

19

VCC

20

U13

SN74AHC541

OE1

1

A1

2

A2

3

A3

4

A4

5

A5

6

A6

7

A7

8

A8

9

GND10Y8

11

Y7

12

Y6

13

Y5

14

Y4

15

Y3

16

Y2

17

Y1

18

OE2

19

VCC

20

U14

SN74AHC541

D08

D09

D10

D11

D12

D13

D14

D15

D16

D17

OTR

DRDY

D06

D07

D04

D05

D02

D03

D00

D01

C108

0.1uF

C107

0.1uF

C110
1uF

C109
1uF

C106

0.1uF

IO_GND

IO_GND

IO_GND

IO_GND

IO_GND

IO_GND

IOVDD

IOVDD

IOVDD

B00

ADS1625 / 26 Data Bus Buffers
Joe Purvis
Joe Purvis

6455116 A

5 7

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

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DOCUMENTCONTROL #

HOST_A2

REFEN*
PD*

RESET*

ADDR_VALID*

RD*

SEL_FIFO(2)

SEL_FIFO(1)

SEL_FIFO(0)

HOST_RD*

HOST_A3

R43
10K

R45
10K

IO_GND

12
34

J8

IO_GND

1 16

2 15

3 14

4 13

5

9

12

6

8

10

11

7

RP6
10K

W10

HOST_CSa*

R36
10K

CLK

HOST_WR*

2 4

A Y

U10A

SN74AHC1G04

W9

SW2

R47

130K

C104

0.1uF

R46

169K

IO_GND

HOST_WR*

OTR

DRDY

DRDY_OUT

GND

3

Vcc

5

U9B

SN74AHC1G86

GND

3

Vcc

5

U7B

SN74AHC1G86

C100

0.1uF

C103

0.1uF

1
2

4

A
B

Y

U9A

SN74AHC1G86

1
2

4

A
B

Y

U7A

SN74AHC1G86

IOVDD

1

1

3

3

5

5

7

7

9

9

11

11

13

13

15

15

16

16

14

14

12

12

10

10

8

8

6

6

4

4

2

2

SW1

DIP_SWITCH_8POS

HOST_CSa*

ADDR_VALID*

ADDR_VALID*

GND

3

Vcc

5

U10B

SN74AHC1G04

C97

0.1uF

9

10

8

A
B

Y

U11C

SN74AHC32

4
5

6

A
B

Y

U11B

SN74AHC32

12

13

11

A
B

Y

U11D

SN74AHC32

GND

7

VCC

14

U11E

SN74AHC32

IO_GND IO_GND IO_GND

C105

0.1uF

IO_GND

GND

3

Vcc

5

U5B

SN74AHC1G32

C102

0.1uF

IO_GND

IOVDD IOVDD

IOVDD

IOVDD

IOVDD IOVDD IOVDDIOVDD IOVDD

1
2

4

A
B

Y

U5A

SN74AHC1G32

C93

0.1uF

IO_GND

IOVDD

1
2

3

A
B

Y

U11A

SN74AHC32

ADS1605_CS*

2 4

A Y

U15A

SN74AHC1G04

GND

3

Vcc

5

U15B

SN74AHC1G04

C112

0.1uF

IO_GND

IOVDD

W11

PRE

10

CLK

11

D

12

CLR

13

Q

9

Q

8

U8B

SN74AHC74

PRE

4

CLK

3

D

2

CLR

1

Q

5

Q

6

U8A

SN74AHC74

VCC

14

GND

7

U8C

SN74AHC74

TP2

TP1

TP3

B

1

C

3

E

2

U16

D1

R50

100R

IOVDD

IO_GND

R49
10K

IOVDD

TP4

ADS1625 / 26 Digital Interface
Joe Purvis
Joe Purvis

6455116 A

6 7

1 2 3 4 5 6

A

B

C

D

654321

D

C

B

A

ti

12500 TI Boulevard. Dallas, Texas 75243

Title:

SHEET: OF:

FILE: SIZE:DATE:

REV:

17-Nov-2003

Drawn By:

Engineer:

Revision History

REV ECN Number Approved

Power.Sch

DOCUMENTCONTROL #

DVDD3.0V

+

C43

10uF

C88

1uF

+

C92

47uF

IOVDD

+

C48

4.7uF

C99

1uF

+

C96

47uF

IO_GND

C40

0.1uF

+

C69

47uF

+

C63

47uF

C70

0.1uF

-6V

+6V

+VA

L2
220uH

L1
220uH

W8

+5VD

-VA

12345678910

J4/P4

+VA

-VA

+5VD

IO_GND1

R35
0R

DGND

IO_GND

MOD_AGND

R40
0R

AGND1

AVDD

DVDD3.0V

L3
220uH

MOD_AVDD

IO_GND

IO_GND

AGND

AGND

C66
.001uF

C53

0.1uF

AGND

+

C42

4.7uF

C91

1uF

+

C74

47uF

C39

0.1uF

+

C85

4.7uF

C37

1uF

+

C77

47uF

C41

0.1uF

MOD_AGND

AGND

R34
0R

ADS1625 / 26 Power
Joe Purvis
Joe Purvis

6455116 A

7 7

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