Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodAD2™ Reference Manual

Revised April 17, 2015

This manual applies to the PmodAD2 rev. A

DOC#: 502-217

Other product and company names mentioned may be trademarks of their respective owners.

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Overview

The Digilent PmodAD2 is an analog-to-digital converter module with up to four channels at 12-bit resolution.

1 Functional Description

The PmodAD2 utilizes Analog Devices® AD7991 to provide up to four channels of 12-bit analog-to-digital

conversion.

2 Interfacing with the Pmod

The PmodAD2 communicates with the host board via the I²C protocol. System boards are able to call the Pmod by

sending out the device address of 0b0101000 followed by the appropriate read or write bit. If a write bit is chosen,

users may then configure the on-board chip to only use certain channels or may immediately start reading the 12

bits of data from the 16-bit data register if the read bit is sent.

Unlike other devices that use I²C, no addresses are associated with these two registers; only the read/write bit at

the end of the slave address distinguishes between the two registers. By default, all four channels have analog-to-

The PmodAD2.

 Up to four analog to digital converter channels

 Up to 12-bit resolution

 On-board 2.048V voltage reference

 Ability to choose the voltage reference

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodAD2™ Reference Manual Revised April 17, 2015 This manual applies to the PmodAD2 rev. A Overview The Digilent PmodAD2 is an analog-to-digital converter module with up to four channels at 12-bit resolution. Features include:     Up to four analog to digital converter channels Up to 12-bit resolution On-board 2.048V voltage reference Ability to choose the voltage reference The PmodAD2.
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PmodAD2™ Reference Manual digital conversions performed on them sequentially with the supply voltage VCC acting as the voltage reference for the ADC. After each conversion is performed, the device places itself into power-down mode. Upon a read command, the device will wake itself up and prepare for a conversion, which takes approximately 0.6 μs. The actual conversion process takes approximately 1.0 μs.