National Semiconductor ADC121C021, ADC101C021, ADC081C021, ADC121C027, ADC101C027 User Manual

National Semiconductor

Evaluation Board User's Guide

I2C-Compatible, 12-Bit, 10-Bit, or 8-Bit

January 3, 2008

Rev – 1.1/CC

RoHS Compliant

Analog-to-Digital Converter (ADC) with Alert Function

ALERT Option

ADDRESS Option

12-bit 10-bit 8-bit

ADC121C021 ADC101C021 ADC081C021

ADC121C027 ADC101C027 ADC081C027

NOTE: The Evaluation Board is shipped with the Alert Option of the ADC. To
evaluate the Address Option, please order samples from www.national.com

.

Table of Contents

1.0 Introduction ............................................................................................................................3

2.0 Board Assembly .....................................................................................................................4

3.0 Quick Start .............................................................................................................................5

3.1 Stand Alone Mode.....................................................................................................5

3.2 Computer Mode ........................................................................................................5

4.0 Functional Description............................................................................................................6

4.1 Jumper Settings ........................................................................................................6

4.2 Analog Input Signal ...................................................................................................7

4.3 ADC Reference Circuitry...........................................................................................7

4.4 I2C Interface ..............................................................................................................7

4.5 Alert Function ............................................................................................................7

4.6 Automatic Conversion Mode .....................................................................................8

4.7 Power Supply Connections .......................................................................................8

5.0 Software Operation and Settings ...........................................................................................8

5.1 Software Quick Start .................................................................................................8

5.2 Data Analysis ............................................................................................................9

5.3 Register Control ........................................................................................................10

5.4 Troubleshooting WaveVision ....................................................................................11

6.0 Evaluation Board Specifications ............................................................................................12

7.0 Test Points, Connectors, and Jumpers ..................................................................................12

8.0 Hardware Schematic..............................................................................................................13

9.0 Evaluation Board Layers ........................................................................................................14

10.0 Evaluation Board Bill of Materials ........................................................................................15

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1.0 Introduction

This Design Kit (consisting of the ADC Evaluation
Board and this User's Guide) is designed to ease
evaluation and design-in of National
Semiconductor’s ADC121C021 family of Analog­to-Digital Converters. The ADCs can operate at
speeds up to 188.9 kSPS. The converter features

2

an I

C interface and an Alert function. This User’s
Guide supports all three resolutions and both
package options of the ADC121C021 ADC family.
All the devices in the family (ADC121C021,
ADC121C027, ADC101C021, ADC101C027,
ADC081C021, and ADC081C027) will be referred
to as the ADC121C021 in this document. The
ADCXX1C021 options offer an ALERT output pin,
whereas, the ADCXX1C027 offers an address
selection pin. The board comes stuffed with the
ALERT option (ADCXX1C021). To evaluate the
Address Option (ADCXX1C027) with this board,
please go to www.national.com

and order
samples. Use care when de-soldering the ADC to
ensure the pads of U3 are not damaged.

The evaluation board can be used in either of two
modes. In Stand Alone, suitable test equipment
such as a logic analyzer with a pattern generator
can be used with the board to evaluate the
ADC121C021’s performance.

JP1: INPUT

SELECT

J2: INPUT

In the Computer mode, data capture and
evaluation are simplified by connecting the
evaluation board to National Semiconductor's
WaveVision 4 Data Capture Board (order number
WAVEVSN BRD 4.1 or higher) which connects to
a personal computer through a USB port and runs
WaveVision 4 software revision 4.4 or higher.

The latest version of the WaveVision 4 software
should be downloaded from the web at

http://www.national.com/adc

.

Note: WaveVision software version 4.4 or higher
is required to evaluate this part with the WV4
Evaluation System.

The WaveVision 4 software operates under
Microsoft Windows. The signal at the analog
input is digitized, captured, and displayed on a PC
monitor in the time and frequency domains.

The software will perform an FFT on the captured
data upon command. This FFT plot shows the
dynamic performance in the form of SNR, SINAD,
THD, SFDR, and ENOB. A software histogram of
the captured data is also available. WaveVision
also provides control of the ADC’s internal
registers through the WaveVision4 software.

The signal at analog input J2 is digitized by U3,
the ADC121C021.

U3: ADC

[ADC121C021]

JP2: I2C PULL-UP

Enable

U2: AMP

[LMP7731]

JP5: VA

SELECT

JP7: 4.1V

REF Enable

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U5: REF

[LM4050-4.1]

Figure 1: Component Locations

J1: WV4S

Connector

2.0 Board Assembly

The ADC121C02XEB evaluation board comes
fully assembled and ready for use. The provided
jumpers are in their recommended locations and
suit the needs of most users. Refer to the Bill of
Materials for a description of components, to

Figure 1 for major component placement, and to
Figure 10 for the evaluation board schematic.

While the board has been populated in a manner
that is most advantageous for typical usage, the
board can be customized by adding components
to meet the user’s specific needs. The board
comes ready to use with a DC coupled input

signal (Figure 2). However, by adding DC bias

resistors R1 and R4 (value 4.99kΩ), and changing
C1 to a 1.0uF capacitor, the board can be used

with an AC coupled input signal (Figure 3).

If needed, the input can be terminated by adding
an appropriate termination resistor at R3. The
V_IN footprint (J2) has been stuffed with a single­pin header for testing typical, slow-moving DC
input signals. An SMA footprint is also included
on the PCB and should be used for precise
dynamic performance evaluation. The Bill of

Materials (Section 10) lists an appropriate SMA

connector to use.
The LMP7731 Low-noise, Precision Operational
Amplifier is included on the ADC121C02XEB for
convenient buffering of the analog input. By
default, it is configured as a simple voltage

follower (Figure 4). Resistors R10 and R11 can

be modified to add non-inverting gain to the
circuit. Adding capacitance at C6 configures the
amplifier as a low-pass filter. To incorporate the
input buffer into the signal path, short pins 2 and 3
of JP1.

Figure 2: DC Coupled Input Configuration

Figure 4: Input Buffer Configuration

Figure 3: AC Coupled Input Configuration

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The LM4050-4.1 Precision, Micropower, Shunt
Voltage Reference is included on the
ADC121C02XEB as a clean reference solution for
the ADC. To evaluate the ADC using the
LM4050, simply short pins 1 & 2 of JP7, and move
the VA_SELECT jumper to pins 7 & 8 of JP5

(Figure 5).

Figure 5: LM4050 Jumper Configuration

3.0 Quick Start

The ADC121C02XEB evaluation board may be
used in the Stand Alone mode to capture data
with a logic analyzer or third party equipment, or it
may be used in the Computer Mode with a
WaveVision 4 Data Capture Board, referenced
throughout the remainder of this document as
WV4. In both cases, the data may be analyzed
with the WaveVision software.

3.1 Stand Alone Mode

Refer to Figure 1 for locations of test points and

major components.

1. The I

2

C interface signals (SCL and SDA) may

be driven directly at J1 or with wires soldered

to VIA1 and VIA2 (step 7). A fully-compliant

2

I

C interface analyzer should be used to drive
SCL and SDA while monitoring the data
output (SDA).

2. The board provides the option of adding 2kΩ

pull-up resistors to the I
To enable the pull-up resistors, short pins 1 &

2 of JP2. Assuming the I

2

C bus, SCL and SDA.

2

C analyzer has

built-in pull-up resistors, the jumper at JP2

must be removed to disable the on-board pull­up resistors. If the I

2

C analyzer doesn’t have

built-in pull-up capability, leave JP2 shorted.

3. Connect a clean analog (not switching) +5.0V
power source with a 300mA current limit to

power connector TP7. Ground TP6.

4. Move the shorting jumper at JP5 to pins 9 &

10. NOTE: only two consecutive pins may be

shorted on JP5 at a time.

5. Turn on the power supply.

6. Connect the input signal to the test-point at
J2. The input signal return can be connected
to ground at TP3. Please note the evaluation
board is assembled for a DC-coupled input
source. The board is designed for an AC
coupled input as well. Modifying the board for
an AC coupled input is described above in

Section 2.0. If the source has a 50 ohm output

impedance, install a 51 ohm resistor at R3.
To accurately evaluate the dynamic
performance of the ADC121C021, the source
must be better than 90dB THD.

7. If evaluating the ADC121C027, configure the

2

I

C slave address. The address is controlled
by VIA5. With VIA5 left floating, the slave
address of the ADC121C027 will be set to
50hex. Grounding VIA5 sets the address to
51hex. Connecting VIA5 to V

sets the

A

address to 52hex.

8. If evaluating the ADC121C021, the slave
address is permanently set to 54hex.

9. If evaluating the ADC121C021, the ALERT
pin can be monitored at VIA5.

3.2 Computer Mode

Refer to Figure 1 for locations of test points and

major components. The board comes configured
for “plug-and-play” WaveVision evaluation.

1. Run the WaveVision 4 program, version 4.4 or
higher is required to interface to the WV4
board. While the program is loading, continue
below.

2. Connect a USB cable between the WV4
board and the PC running the WaveVision 4
software.

3. Make the following required jumper

connections, see table 1 for more details:

• JP1 - pins 1 & 2

• JP2 - pins 1 & 2

• JP5 - pins 3 & 4 (All other pins of JP5

must be left open)

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4. Connect the J1 header on the ADC121C021

(

N

(

N

(

evaluation board to the WV4 serial connector

(J7) on the WV4 board. Refer to Figure 6 for
the serial connection and Figure 7 for the J1

header pin out.

7. Refer to Section 5.0 on Software Operation

and Settings to setup the WaveVision 4
software.

4.0 Functional Description

4.1 Jumper Settings

Table 1 describes the function of the various

jumpers on the ADC121C021 evaluation board.
The evaluation board schematic is shown in

Figure 10.

Figure 6: WV4 to ADC121C02XEB Connection

SDA

ADC)

1

2

GND

3

4

SDA

ADC)

5

6

/C

7

8

GND

/C

SDA

EEPROM)

9

11

10

12

SCL

(EEPROM)

+3.3V

13

14

+5V

Figure 7: J1 (WV4S) Header Pin Out

5. Perform step 6 of section 3.1 to drive the
analog input. For information on changing the
configuration of the analog input section, read

Section 2.0 Board Assembly for details. The

board comes ready for a DC coupled input
signal.

6. Connect a clean (not switching) +5.0V power
source with a 350mA current limit to power

connector J1 on the WV4 board. Turn on the

power supply.

Jumper

JP1

JP2

JP3

JP5

JP6

JP7

Pins 1 & 2

Pins 3 & 4

Pins 5 & 6

Pins 7 & 8

Pins 9 & 10

Pins 1 & 2 Pins 2 & 3

Select direct V

circuit

Enable I

VA SELECT (See Below)

Enable 4.1V Shunt Reference

Jumper JP5 (VA SELECT)

Select 3.3V regulated supply from WV4S

[LM1117MPX-3.3 on the WV4 board]

Select 5.0V supply from WV4S connector.

Select 4.1V shunt reference supply.

Select external supply from TP7.

Table 1: Jumper Configurations

Select Amplified VIN

IN

circuit [LMP7731]

2

C Pull-up resistors

Permanently shorted

Not Used

[LM4050-4.1]

connector.

Not Used

[LM4050-4.1]

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4.2 Analog Input Signal

There are three basic options for connecting an
input signal to the ADC. The three options
facilitate AC-coupled and DC-coupled input
signals.

The first way to apply an input signal to the ADC
is to connect it to pin 2 of JP1. The signal’s return
(GND) should be connected to TP5. This
configuration provides the input circuit seen in
Figure 8.

Figure 8: Unbiased input circuit.

The second way is to configure the board for an
AC coupled input. DC biasing is available for
inputs applied to J2 but is currently not populated
on the board. By adding DC bias resistors R1 and
R4 (value 4.99kΩ), and changing C1 to a 1.0uF
capacitor, the board can be used with an AC

coupled input signal (Figure 3). To improve the

signal integrity of the connection to the board, an
SMA connector should be stuffed at J2 (V_IN). If
the input source has a 50Ω output impedance, a
51Ω resistor can be installed at R3.

The third way to configure the input is by
incorporating the Amplifier into the signal path.
The LMP7731 Low-noise, Precision Operational
Amplifier is included on the board for convenient
buffering of the analog input. By default, it is

configured as a simple voltage follower (Figure 4).

Resistors R10 and R11 can be modified to add
non-inverting gain to the circuit. Adding
capacitance at C6 configures the amplifier as a
low-pass filter. To use the input buffer, simply
move the JP1 jumper to pins 2 & 3.

In any case, it is important that the signal stays
within the allowable input range of the ADC (0V to
V

). Dynamic input signals should be applied

A

through a bandpass filter to eliminate the noise
and harmonics commonly associated with signal
sources. To accurately evaluate the performance
of the ADC121C021, the source must be better
than -90dBc THD.

4.3 ADC Reference Circuitry

The ADC121C021 family is internally referenced.
Therefore, the Analog-to-Digital converter gets its
reference from the analog supply (V

). Hence, a

A

clean analog supply must be used to guarantee
the performance of the ADC.

2

4.4 I

C Interface

Please refer to section 1.7 of the ADC121C021
datasheet for a detailed description of the I

2

C

interface.

The board is designed with I

2

C pull-up resistors on
both the SDA and SCL lines (R8 & R9). These
resistors are enabled by a single jumper (JP2)
and can easily be added or removed from the I

2

C
bus. Also, footprints for series resistors are
designed into the board (R2 & R5). The board is
shipped with 0Ω resistors which can be modified
to provide series resistance if interfacing to a

2

noisy I

C bus.

The SDA signal is accessible by soldering to VIA1
or connecting to pin 1 of the WV4S connector
(J1). The SCL signal is accessible by soldering to
VIA2 or connecting to pin 5 of J1.

The on-board pull-up resistors can be powered
with an external supply by removing the jumper at
JP2 and connecting the supply to pin 2 of JP2 or
VIA6.

4.5 Alert Function

The ADC121C021 provides a programmable “out­of-range” Alert function. At the end of every
conversion, the measured voltage is compared to
the values in the V

HIGH

and V

registers. If the

LOW

measured voltage violates either of these values,
an alert condition occurs. The Over Range Alert
flag in the Alert Status Register indicates the V

HIGH

limit has been violated. The Under Range Alert
flag indicated the V

limit has been violated. If

LOW

enabled, the alert condition is also propagated to
bit15 of the Conversion Result Register and the
ALERT output pin.

The Alert function is configured by writing to the
ADC’s internal registers. Refer to Section 1.6 of
the Datasheet for a detailed description of the
ADC’s internal Registers.

Refer to Section 1.8 of the Datasheet for a

detailed description of the Alert function.

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4.6 Automatic Conversion Mode

The Automatic Conversion Mode configures the
ADC to continually perform conversions without
receiving “read” instructions from the I

2

C
controller. It is activated by writing a non-zero
value into the Cycle Time bits “D[7:5]” of the
Configuration Register. Various automatic
conversion rates are supported.

Refer to Section 1.9 of the Datasheet for a

detailed description of the Automatic Conversion
Mode.

4.7 Power Supply Connections

The analog supply voltage (VA) can range from
+2.7V to +5.5V. The Evaluation system provides a
handful of power supply options via the JP5

header (see Table 1). V

can be driven by the

A

LM4050-4.1 Shunt Reference, the LM1117MPX-

3.3 LDO from the WV4 board, or an external
supply. National recommends the LM4050
precision reference for the ADC121C021.

NOTE: In Computer mode, if V

is driven with less

A

than 3.3V in Computer mode, an external 3.3V
pull-up supply is needed. This will ensure the

3.3V CMOS logic thresholds of the WaveVision4
board are met for SDA and SCL.

To use an external pull-up supply, remove the
jumper at JP2 and connect the supply to pin 2 of
JP2 or VIA6. An external pull-up supply will also
improve the dynamic performance of the ADC.

Typical supply currents when applying an external
supply to TP7 (VA_EXT) and performing ADC
conversions are as follows:

• For V

• For V

= +3.3V, I = 8mA

A

= +5.0V, I = 11mA

A

Note: A majority of this current is for powering
devices external to the ADC121C021 such as the
pull-up resistors and the input amplifier.

When operating in Stand Alone mode, always use
an external supply. Apply a +5.0V power source
with a current limit of 100mA to TP7, ground TP6,
and place a shorting jumper across pins 9 & 10 of
JP5.

Note: The +3.3V requ ired to power the EEPRO M
(U4) is obtained throug h J2 from the WV4 board.
The EEPROM is used to ident ify the type of Eval
Board connected to the WaveVision system in
Computer Mode.

5.0 Software Operation and Settings

The WaveVision 4 software is included with the
WV4 board and the latest version can be
downloaded for free from National's web site at

http://www.national.com/adc

. WaveVision4
software version 4.4 or later is required to
evaluate this device with the WaveVision system.

5.1 Software Quick Start

To install this software, follow the procedure in the
WV4 Board User's Guide. Once the software is
installed, run and set it up as follows:

1. Connect the WV4 board to the host computer

with a USB cable.

2. From the WaveVision main menu, go to

Settings and then Capture Settings to open

the System Settings window (Figure 9) and

select the following:

• WaveVision 4 (USB)

• Number of Samples: 2k to 128k, as

desired

• Data Format: Binary

When operating in the computer mode, the supply
voltage for V

can be applied externally or

A

supplied directly by the WV4 board through J1.
The external supply voltage is selected by placing
a jumper across pins 9 & 10 of JP5, applying a
power source with a 300mA current limit to TP7,
and grounding TP6. To use the 5.0V supply
directly from the WV4 board, place a shorting
jumper across pins 3 & 4 of JP5. To use the 3.3V
supply directly from the WV4 board, place a
shorting jumper across pins 1 & 2 of JP5. To use
the LM4050 4.1V Shunt Reference, place a
shorting jumper across pins 7 & 8 of JP5. For the
best performance, use a clean external supply.

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Figure 9: System Settings window

3. Apply power as specified in Section 4.4, click

on the "Reset" button and await the firmware

to download.

4. Click on the "Close" button to close the

System Settings window.

5. Navigate to the ADC121C021 Eval Board
Window. This is the Control Panel for the

device (Figure 10).

2

7. Set the I

C Slave Address (Figure 10). The

address will default to the correct address for
the ADC121C021 (54hex). If evaluating the
ADC121C027, the I

2

C address must be
changed to reflect the state of the address
selection pin (ADDR).

8. Press the “Read Registers” button. All of the

register fields will update (Figure 10).

9. Configure the ADC’s internal registers. The
Alert function and Automatic Conversion
Mode are setup through the Configuration
register. After making changes to a register
value, press the Enter key to write the register

(Figure 10).

10. To capture a dataset from the ADC, navigate
back to the main WaveVision window.

11. After the steps outlined in Section 3.2 are
completed, click on ‘A

cquire’ then ‘Samples’

from the Main Menu (you can also press the

F1 shortcut key). If a dialog box opens, select

‘D

iscard’ or press the Escape (Esc) key to

start collecting new samples.

5.2 Data Analysis

WaveVision main menu will display an output plot.
Make sure there is no clipping of data samples.
Click on the software histogram tab and ensure
data does not exceed the limits of the device. The
samples may be further analyzed by clicking on
the magnifying glass icon, then clicking and
dragging across a specific area of the plot for

better data inspection (Figure 12). See the

WaveVision 4 Board User's Guide for more
details.

Figure 10: ADC121C021 Control Panel

6. Select the desired I

2

C Speed from the pull-

down menu (Figure 11).

Figure 11: ADC121C021 Control Panel

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Figure 12: Software Histogram: Sine Wave Input

To view an FFT of the data captured, click on the
‘FFT’ tab. This plot may be zoomed in on the data
plot. A display of dynamic performance
parameters in the form of SINAD, SNR, THD,
SFDR and ENOB will be displayed at the top right

hand corner of the FFT plot (Figure 13).

Figure 13: FFT: 1kHz Sine Wave Input

Acquired data may be saved to a file. Plots may
also be exported as graphics. See the Data
Capture Board User's Guide for details.

5.3 Register Control

The ADC’s internal registers are controlled
through the ADC121C021 Control Panel

(see Figure 7). WaveVision allows both read and

write access to these registers. To read the
registers, simply click the “Read All” button in the
Control Panel window. Each of the registers is
read and displayed in the control panel. To write
to a register, simply type in the 8-bit or 16-bit hex
value to be written to the register and press Enter.
All hex values are assumed to be right justified.
Zeros are written to unspecified bits.

Many functions of the ADC121C021 are enabled
through the internal registers. Please refer to

Section 1.6 on Internal Registers in the Datasheet

for further details.

For example, the following steps will enable the
ALERT pin, set the V

threshold to ¾ full-scale,

LOW

and create an Under Range Alert condition.

-Write 0x04 to the Configuration register.

-Write 0xBFF to the V

-Ground the analog input (V

register.

LOW

).

IN

-Click the “Read Registers” button to read all the

registers.

-The Alert Status register will read 01hex to

indicate that the V

value was violated and an

LOW

Under Range Alert condition has occurred.

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5.4 Troubleshooting WaveVision

5.4.1 Problems

Problem 1:

The “ADC121C021 Eval Board”
Control Panel appears briefly, but disappears after
powering on the WaveVision board. Try Solutions
A, B, and C. After trying these solutions, the
WaveVision system must be hard reset to
recover. Press SW1 on the WV4 board to reset
the system.

Problem 2:

The following error occurs when I try

to acquire data samples. Try Solution D.

5.4.2 Solutions

Solution A:

Ensure power is supplied to the VA

supply on the board. A single jumper must be

placed across either pins 1&2, pins 3&4, pins 7&8,
or pins 9&10 of JP5 to select the board’s power
source. If using the Shunt Reference, pins 1&2 of
JP7 must be shorted. The V

supply is measured

A

by probing VIA10.

Solution B:

Ensure the pull-up resistors are
powered (R8 and R9). In Computer mode, JP2
must be shorted by a jumper for the WaveVision
software to work properly.

Problem 3:

The following error occurs when I try
to read or write registers through the Control
Panel. Try Solution D.

Problem 4:

One of the following errors occurs
when I try to read or write registers through the
Control Panel. “java.lang.Exception: A USB
…CMD_REG_RW … while sending bulk read.”

“An exception occurred. Control Panel…”

Solution C:

Ensure the board is firmly connected

to the WV4 board via the WV4S connector (J1).

See Figure 6.
Solution D:

Ensure the I2C Slave address is set
correctly in WaveVision. If evaluating the
ADC121C021, the address must be set to 0x54.
If evaluating the ADC121C027, the address will
be 0x50 if no user modifications have been made
to the board and ADDR is floating. If ADDR is tied
to GND, the address must be set to 0x51. If
ADDR is tied to V

, the address must be set to

A

0x52.

Solution E:

Ensure the 3P3V supply is connected
to the 3.3V regulated supply from the WV4 board.
The 3P3V supply is measured by probing pin 1 of
JP5. Test this with a volt-meter. The EEPROM
(U4) must be powered with 3.3V for WaveVision
to work properly.

Try Solutions A, B, and C. After trying these
solutions, the WaveVision system must be hard
reset to recover. Press SW1 on the WV4 board to
reset the system.

Problem 5:

The Eval Board is not recognized

correctly in the System Settings Window (Figure

9). Try Solutions D and E.

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6.0 Evaluation Board Specifications

Board Size: 3.1" x 1.85" (7.9 cm x 4.6 cm)

Power Requirements:

I2C Interface Speed: 100 kHz, 400kHz, or 3.4 MHz

Analog Input Range: GND to VA

Min: +2.7V,
10mA

Max: +5.5V,
13mA

7.0 Test Points, Connectors, and Jumpers

Test Points on the ADC121C021 Evaluation Board

TP2: AGND Ground. Located at the center of the board.

TP3: AGND Ground. Located at the top left of the board.

TP5: AGND Ground. Located at the top middle of the board.

TP6: AGND Ground. Located at the left side of the board.

TP7: VA_EXT External Power supply input. Located at the left side of the board.

TP8: AGND Ground. Located at the bottom right of the board.

TP9: WV_CLK_IN Not Used.

TP10: AGND Ground. Located at the right side of the board.

Connectors on the ADC121C021 Evaluation Board

J1: WV4S 14 pin dual row right angle male header: Connects to WV4 board.

J2: V_IN Analog Input of the Eval Board.

Selection Jumpers on the ADC121C021 Evaluation Board (Refer to table 1 in Section 4.0 for configuration details)

JP1: V_IN SELECT Selects buffered or unbuffered signal path.

JP2: V_PULL SELECT Enables the on-board I2C pull-up resistors.

JP3: V+_AMP Permanently shorted. Connects VA to the V+ supply of the Amplifier.

JP4: OSC_ENABLE Not Used.

JP5: VA SELECT Selects the VA source (See section 4.4)

JP6: CLK SELECT Not Used.

JP7: VA_EXT_SHUNT Enables the 4.1V Shunt Reference. Connects the 5P0V supply to the reference circuit.

JP8: VA_EXT_LDO Not Used.

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8.0 Hardware Schematic

WV4S

2468101214

J1 WV4S

1

1

1

1

AGND AGND

1

1

1

1

13579

SCL

SDA

R5 0

R2 0

R7 NS

I2C SPIVIA

CSb

SCLK

SDA

---

123

AGND

3

21

SDATA

SCL

VIA4

VIA3

VIA2

VIA1

EEPROM

U4

24C02

GND

SDA

5
6
7

SCL_EEPROMSDA_EEPROM

5P0V

11

13

3P3V

CLKSEND

3P3V_WV 5P0V_WV

VA

L1 100uH

1

1

VIA6

R9

2K

1

2

R8

2K

JP2

8

C5

3P3V_WV

C3

10.0uF

V_PULL

V_PULL SELECT

4

A2

SCL

3

A1

WP

A0

VCC

0.1uF

5P0V_WV

R12 0

1

1

VIA9

3P3V_WV

2

R14

NS

1

R13

L2

100uH

1

TP5

AGND

AGND

3P3V_WV

NS

1

1

TP10

AGND

1

1

TP9

CLKSEND

JP4

Y1

OSC (THROUGH-HOLE)

C9

1.0uF

1

1

OE

VDD14GND

OUT

8

R15 51

JP6

CLK SEL ECT

R18 NS

CLK SEL ECT

7

3

2

1

R17 NS

VA_EXT

WV_CLK_IN AGND

R19 51

C10

0 Ohm R

3P3V_WV

1

1

AGND

TP8

AGND

5

4

AGND

1

TP2

AGND

R1

NS

VA

V_IN

V_IN

J2

234

5

1

1

TP3

AGND

AGND

6

SDA

1

VA1GND2VIN

U1

ADC121C021

VA

C12

0.1uF

C1

0 Ohm RES

1

1

1

VIA5

ALR/ADR

SCL

ALR/ADR

3

C2

R6

20

123

JP1

R4

NS

R3

NS

ALR

1

1

VIA8

ADR0

2

V(-)

1

VA

1

2
36
45

1

1

Vout

R10 0

5

C4

0.1uF

2
1

U3

1

1

VIA10

VA

C6 NS

R11

NS

JP3

I_AMP

V+_AMP

1

VIA13

NS

470pF

INPUT SELECT

V_IN SELECT

3

Vin (+)

Vin(-)4V(+)

U2

LMP7731

1

VIA7

ADR1

8

1

1

VIA11

7

JP5

C8

0.1uF

C7

10.0uF

L3 0 Ohm R

VA

->37 mil inch drills

->57 mil inch pads

Smal l Perf-board Area

->100 mil i nch spac ing

VA SELECT

2
4
6
8
10

1

1

TP7

VA_EXT

VA_EXT

5P0V_WV

3P3V_WV

2

1

JP8

VA_EXT_LDO

U6

1

VA_EXT_SHUNT

5

Vref

NC1GND2EN

2 1

U5

LM4050-4.1

1

5P0V_WV

C11

NS

4

Vin

NS (LDO Re feren ce)

3

1
3
5
7
9

3.3V LDO

REFERENCE

1

VIA12

R16 56

2

5P0V_WV

4.1V SHUNT

REFERENCE

JP7

1

1

TP6

AGND

AGND

Figure 10: ADC121C021 Evaluation Board Schematic

http://www.national.com

13

9.0 Evaluation Board Layers

Figure 11: ADC121C021 Evaluation Board: All Layers with Silk Screen

Figure 12: ADC121C021 Evaluation Board: Top Layer

Figure 13: ADC121C021 Evaluation Board: Bottom Layer

http://www.national.com

14

10.0 Evaluation Board Bill of Materials

Qty Reference Value Description Source Source Part # Manufacturer Manufacturer Part #

1 C1 0 Ohm R 0 Ohm RES

1 C2 470pF CAP

2 C3,C7 10.0uF CAP Digikey 511-1463-1-ND Kemet

5 C4,C5,

C8,C12

1 C6,C11 NS CAP

1 C9 1.0uF CAP

1 C10 0 Ohm R 0 Ohm RES

1 JP1 INPUT SELECT JUMPER Digikey A26513-40-ND

1 JP2 V_PULL JUMPER Digikey A26513-40-ND

1 JP3 NS JUMPER

1 JP4 NS JUMPER

1 JP5 VA SEL JUMPER Digikey A26529-40-ND

1 JP6 CLK SELECT JUMPER Digikey A26513-40-ND

1 JP7 VA_EXT_SHUNT JUMPER Digikey A26513-40-ND

1 JP8 NS JUMPER

1 J1 WV4S HEAD Digikey S5803-07-ND Sullins PRPN072PARN-RC

1 J2 V_IN TP

0.1uF CAP

Digikey 5011K-ND
Center Via
of SMA

2 L1,L2 100uH IND Digikey 490-1056-1-ND Murata BLM31PG121SN1L

1 L3 0 Ohm R 0 Ohm RES

9 R1,R3,R4,

R7,R11,
R13,R14,
R17,R18

4 R2,R5,

R10,R12

1 R6 20 RES

2 R8,R9 2K RES

2 R15,R19 51 RES

1 R16 500 RES

1 TP2 AGND TP NS

2 TP3,TP6 AGND TP Digikey 5011K-ND

3 TP5,TP8,

TP10

1 TP7 VA_EXT TP Digikey 5011K-ND

1 TP9 WV_CLK_IN TP NS

1 U1 ADC121C021 ADC -TSOT6 NSC ADC121C021CIMK

1 U2 LMP7731 AMP-SOT23-5 NSC LMP7731MF

1 U3 NS MSOP8

1 U4 24C02 EEPROM

1 U5 LM4050-4.1 SHUNT REF NSC LM4050AIM3-4.1

1 U6 NS LDO-SOT23-5 NSC LM4132AMF-3.3

12 VIA1-13 NS

1 Y1 OSC (Socket) Digikey A400-ND Aries 08-3518-10

NS RES

0 RES

AGND TP Digikey Single-pin

Header

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15

BY USING THIS PRODUCT, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF NATIONAL
SEMICONDUCTOR'S END USER LICENSE AGREEMENT. DO NOT USE THIS PRODUCT UNTIL YOU HAVE READ AND
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VENDOR WITHIN TEN (10) DAYS OF RECEIPT FOR INSTRUCTIONS ON RETURN OF THE UNUSED PRODUCT FOR A
REFUND OF THE PURCHASE PRICE PAID, IF ANY.

The ADC121C02XEB, ADC101C02XEB, and ADC081C02XEB Evaluation Boards are intended for product evaluation purposes
only and are not intended for resale to end consumers, are not authorized for such use, and are not designed for compliance with
European EMC Directive 89/336/EEC, or for compliance with any other electromagnetic compatibility requirements.

National Semiconductor Corporation does not assume any responsibility for use of any circuitry or software supplied or described.
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National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National reserves the right at any
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16

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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
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.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from

the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
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ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
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Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
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No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
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REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
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For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,
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User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and
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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
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Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the
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FCC Interference Statement for Class A EVM devices

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
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FCC Interference Statement for Class B EVM devices

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
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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.

For EVMs annotated as IC – INDUSTRY CANADA Compliant

This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment.

Concerning EVMs including radio transmitters

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
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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.

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de

l'utilisateur pour actionner l'équipement.

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
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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
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(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
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【【Important Notice for Users of this Product in Japan】】

This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan

If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:

1. Use this product 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 this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this
product, or

3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with
respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note
that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.

(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan

http://www.tij.co.jp

【ご使用にあたっての注】

本開発キットは技術基準適合証明を受けておりません。

本製品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

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Texas Instruments Japan Limited

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EVALUATION BOARD/KIT/MODULE (EVM)

WARNINGS, RESTRICTIONS AND DISCLAIMERS

For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished

electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in
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associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end
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Your Sole Responsibility and Risk. You acknowledge, represent and agree that:

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2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable
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