PCM1861 datasheet(34/145 Pages) TI2

34 / 145 page

L(n)

GPIO2

(DIGMIC_CLK)

GPIO1

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

Hi-Z

DATA_L

DATA_R

DIGMIC_CLK

)

(64 × f

GPIO1

CLK

DATA

GPIO2

CLK

DATA

L/R SEL

Wired-OR

DATA_L

DATA_R

GND

VDD

DIGMIC_IN1

GPIO1

GPIO2

L/R SEL

PCM1860, PCM1861, PCM1862

PCM1863, PCM1864, PCM1865

SLAS831D – MARCH 2014 – REVISED MARCH 2018

www.ti.com

Product Folder Links: PCM1860 PCM1861 PCM1862 PCM1863 PCM1864 PCM1865

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9.3.8.2 Digital PDM Microphones

Up to four digital microphones are supported on the PCM1864 and PCM1865, using a shared output clock

(configured from GPIO2) and two data lines, GPIO0 or GPIO1. Two digital microphones are supported on the

PCM1862 and PCM1863, mainly using GPIO1 as the data input. The PCM1860 or PCM1861 does not support

digital microphones. The typical connection and protocol diagrams for these microphones are shown in Figure 31

and Figure 32.

Figure 31. Digital Microphone Example Connection

Figure 32. Digital Microphone Protocol

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

sampling frequency as follows:

•

2.0480 MHz (32 kHz × 64)

•

2.8224 MHz (44.1 kHz × 64)

•

3.072 MHz (48 kHz × 64)

•

3.072 MHz (96 kHz × 32 )

The recommended operating conditions for the Digital MIC are:

•

Sampling frequency is 32 kHz or 44.1 kHz

•

SCK is 256 × fS.

•

Enable Auto Clock Detector (Default)

PCM1861 Datasheet(PDF) 34 Page - Texas Instruments

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