PCM1861 datasheet(25/115 Pages) TI

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L(n)

GPIO2

(DIGMIC_CLK)

GPIO 1

L(n+1)

Hi-Z

R(n)

Hi-Z

L(n)

R(n)

R(n+1)

L(n+1)

R(n+1)

L(n+2)

Hi-Z

DATA_L

DATA_R

DIGMIC_CLK (64xf

GPIO1

CLK

DATA

L/R SEL

GPIO2

CLK

DATA

L/R SEL

Wired-OR

DATA _L

DATA _R

GND

VDD

DIGMIC_IN1

GPIO1

GPIO2

PCM1861, PCM1863, PCM1865

www.ti.com

SLAS831C – MARCH 2014 – REVISED AUGUST 2014

8.12 Digital PDM Microphones

Up to four digital microphones are supported on the PCM1865, using a shared output clock (configured from

GPIO2) and two data lines, GPIO0 or GPIO1. Two digital microphones are supported on the PCM1863, mainly

using GPIO1 as the data input. The PCM1861 does not support digital microphones. The typical connection and

protocol diagrams for these microphones are shown in Figure 26 and Figure 27.

Figure 26. Digital Microphone Example Connection

Figure 27. Digital Microphone Protocol

Supported Digital Microphone clock frequency is as follows, and the frequency depends on required operating

sampling frequency as follows:

•

2.0480MHz (32kHz × 64)

•

2.8224MHz (44.1kHz × 64)

•

3.072MHz (48kHz × 64)

•

3.072MHz (96kHz × 32 )

The Recommended operating conditions for the Digital MIC to get good performance are:

•

Sampling frequency is 32kHz or 44.1kHz

•

SCK is 256×fS.

•

Enable Auto Clock Detector (Default)

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Product Folder Links: PCM1861 PCM1863 PCM1865

PCM1861 Datasheet(PDF) 25 Page - Texas Instruments

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