Manual

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodMIC3™ Reference Manual

Revised April 3, 2015

This manual applies to the PmodMIC3 rev. A

DOC#: 502-312

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

Page 1 of 3

Overview

The Digilent PmodMIC3 is a small microphone module with a digital interface. With a Knowles Acoustics

SPA2410LR5H-B MEMs microphone and Texas Instrument's ADCS7476 12-bit andlog-todigital converter, you can

capture your audio inputs with ease.

1 Functional Description

The PmodMIC3 is designed to digitally report to the host board whenever it detects any external noise. By sending

a 12-bit digital value representative of frequency and volume of the noise, this number can be processed by the

system board and have the received sound accurately reproduced through a speaker. The on-board potentiometer

can be used to modify the gain from the microphone into the ADC.

The PmodMIC3.

 MEMs Microphone

 12-bit ADC

 Potentiometer Gain Adjustment

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodMIC3™ Reference Manual Revised April 3, 2015 This manual applies to the PmodMIC3 rev. A Overview The Digilent PmodMIC3 is a small microphone module with a digital interface. With a Knowles Acoustics SPA2410LR5H-B MEMs microphone and Texas Instrument's ADCS7476 12-bit andlog-todigital converter, you can capture your audio inputs with ease.
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PmodMIC3™ Reference Manual 2 Interfacing with the Pmod The PmodMIC3 communicates with the host board via the SPI protocol. The 12 bits of digital data are sent to the system board in 16 clock cycles with the most significant bit first. For the ADC7476, each bit is shifted out on each falling edge of the serial clock line after the chip select line is brought low with the first four bits as leading zeroes and the remaining 12 bits representing the 12 bits of data.
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PmodMIC3™ Reference Manual 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.1 inches long on the sides parallel to the pins on the pin header, and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.