PCM1822 datasheet(28/41 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The PCM1822 is a multichannel, high-performance audio analog-to-digital converter (ADC) that supports output

sample rates of up to 192 kHz. The device supports up to two analog microphones for simultaneous recording

applications.

The PCM1822 configuration is supported using various hardware pin control options. The device supports a

highly flexible, audio serial interface (TDM and I2S) to transmit audio data seamlessly in the system across

devices.

9.2 Typical Application

Figure 9-1 shows a typical configuration of the PCM1822 for an application using stereo analog microelectrical-

mechanical system (MEMS) microphones for simultaneous recording operation with a time-division multiplexing

(TDM) audio data slave interface. For best distortion performance, use input AC-coupling capacitors with a

low-voltage coefficient.

1 F

3.3 V (3.0 V to 3.6 V)

1.8 V (1.65 V to 1.95 V)

3.3 V

(3.0 V to 3.6 V)

PCM1822

IN1P

IN1M

GND

1 F

0.1 F

GND

10 F

1 F

DREG

10 F

GND

0.1 F

IN2P

IN2M

Host

Processor

IOVDD

GND

Thermal Pad

(VSS)

GND

10 F

AMIC1

OUTP

OUTM

VDD

VSS

AMIC2

OUTP

OUTM

VDD

VSS

GND

0.1 F

LOW or HIGH Pin

Selector

Figure 9-1. Two-Channel Analog Microphone Recording Diagram for 3.3-V AVDD Operation

PCM1822

SBASAK0 – DECEMBER 2020 – REVISED MAY 2022

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