Datasheet

ManualsBrandsANALOG DEVICES ManualsDev KitsPCB design board

Evaluation Board User Guide

UG-080

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the AD7170 12-Bit, Low Power Sigma-Delta ADC

Please see the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 12

FEATURES

Full featured evaluation board for the AD7170

Standalone USB interface

Various linking options

PC software for control of the AD7170

GENERAL DESCRIPTION

This document describes the evaluation board for the AD7170,

which is a very low power, 12-bit sigma-delta (Σ-) ADC. It

contains a precision 12-bit Σ- ADC and has one differential

input. The device has an output data rate of 125 Hz. It also has

an on-board clock, eliminating the need for an external clock.

Consuming only 135 µA, the AD7170 is particularly suitable for

portable or battery operated products where very low power is a

requirement. The AD7170 also has a power-down mode in

which the device consumes 5 A, thus increasing the battery life

of the product.

Full data on the AD7170 is available in the AD7170 data sheet

available from Analog Devices, Inc., and should be consulted in

conjunction with this data sheet when using the evaluation board.

The evaluation board interfaces to the USB port of an IBM®-

compatible PC. Software is available with the evaluation board

that allows users to easily communicate with the AD7170.

Note that the AD7170 evaluation board software should be

installed before connecting the AD7170 evaluation board

to the PC.

Another component on the AD7170 evaluation board is the

ADP3330 hig

h precision, low power, 3.3 V output voltage

gulator, which is used to power the USB/SPI interface.

FUNCTIONAL BLOCK DIAGRAM

EXTERNAL

SUPPLY

AD7170

VOLTAGE

REGULATOR

SPI/USB

INTERFACE

PC AND

LabVIEW™

BASED

SOFTWARE

ANALOG

INPUT

VOLTAGE

REFERENCE

REFIN

08750-001

Figure 1.

Summary of content (12 pages)

PAGE 1
Evaluation Board User Guide UG-080 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluation Board for the AD7170 12-Bit, Low Power Sigma-Delta ADC which the device consumes 5 μA, thus increasing the battery life of the product.
PAGE 2
UG-080 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Software ...............................................................5 General Description ......................................................................... 1 Software Description ....................................................................5 Functional Block Diagram ............................................
PAGE 3
Evaluation Board User Guide UG-080 EVALUATION BOARD HARDWARE POWER SUPPLIES SETUP CONDITIONS The AD7170 evaluation board is powered via the 5 V supply from the USB connector, J51. This 5 V supply can be used to power the AD7170 directly. A 3.3 V regulated voltage from the on-board ADP3330 (a high precision, low power, 3.3 V output voltage regulator) can also be used. Alternatively, the AD7170 can be powered using an external 3 V or 5 V power supply via J6.
PAGE 4
UG-080 Evaluation Board User Guide INTERFACING TO THE EVALUATION BOARD To set up the USB/SPI interface, use the following procedure: Interface to the evaluation board is via a standard USB connector, J51, which connects the evaluation board to the USB port of a PC. A standard USB connector cable is included with the AD7170 evaluation board to connect it to the USB port of the PC.
PAGE 5
Evaluation Board User Guide UG-080 EVALUATION BOARD SOFTWARE 3. SOFTWARE DESCRIPTION The AD7170 evaluation board is shipped with a CD containing software that can be installed onto a standard PC to control the AD7170. The software communicates with the AD7170 through the USB cable, which accompanies the board. The software allows you to configure the AD7170 and to read conversion data from the AD7170. Data can be read from the AD7170 and displayed or stored for later analysis.
PAGE 6
UG-080 Evaluation Board User Guide MAIN WINDOW Reference Menu Bar File The value of the external reference should be displayed in the Reference (V) text box. This allows the user to read previously stored data for display or analysis, write the current set of data to a file for later use, and exit the program. Status Bits About This box displays the contents of the status register. Waveform The gathered conversions are displayed in graph form.
PAGE 7
Evaluation Board User Guide UG-080 EVALUATION BOARD SCHEMATIC AND ARTWORK 08750-004 Figure 4. AD7170 Evaluation Board Schematic Rev.
PAGE 8
Evaluation Board User Guide 08750-005 UG-080 08750-006 Figure 5. AD7170 Evaluation Board—Solder Side View 08751-007 Figure 6. AD7170 Evaluation Board—Component Side View Figure 7. AD7170 Evaluation Board—Component Layout Diagram Rev.
PAGE 9
Evaluation Board User Guide UG-080 ORDERING INFORMATION BILL OF MATERIALS Table 4.
PAGE 10
UG-080 Evaluation Board User Guide NOTES Rev.
PAGE 11
Evaluation Board User Guide UG-080 NOTES Rev.
PAGE 12
UG-080 Evaluation Board User Guide NOTES ESD CAUTION Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards.