Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodMIC3™ Reference Manual

Revised January 20, 2016

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 PmodMIC3 is a MEMS Microphone powered by the Knowles Acoustics SPA2410LR5H-B and the Texas

Instruments ADCS7476. Users may adjust the incoming volume to the system board with the small potentiometer

before they receive the 12 bits of data through SPI.

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 module with digital

interface

 Transform audio inputs with 12-bit A/D

converter

 Adjust incoming volume with on-board

potentiometer

 up to 1 MSPS of data

 Small PCB size for flexible designs 1.1 in × 0.8

in (2.8 cm × 2.0 cm)

 6-pin Pmod connector with SPI interface

 Follows Digilent Pmod Interface Specification

Type 2

Features include:

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodMIC3™ Reference Manual Revised January 20, 2016 This manual applies to the PmodMIC3 rev. A Overview The PmodMIC3 is a MEMS Microphone powered by the Knowles Acoustics SPA2410LR5H-B and the Texas Instruments ADCS7476. Users may adjust the incoming volume to the system board with the small potentiometer before they receive the 12 bits of data through SPI.
PAGE 2
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.