8 Detailed Description

8.1 Overview

The PCM1822 is a high-performance, low-power, stereo-channel, audio analog-to-digital converter (ADC) with

flexible audio interface control options. This device is intended for applications in voice-activated systems,

AV receivers, tv and blu-ray players, professional microphones, audio conferencing, portable computing,

communication, and entertainment applications. The high dynamic range of the device enables far-field audio

recording with high fidelity. This device integrates a host of features that reduces cost, board space, and power

consumption in space-constrained applications. The device features are controlled through hardware by pulling

pins high or low with resistors or a controller general-purpose inut/output (GPIO). The PCM1822 also supports a

power-down and reset function by means of halting the system clock.

The PCM1822 consists of the following blocks and features:

• Stereo-channel, multibit, high-performance delta-sigma (ΔΣ) ADC

• Hardware pin control operation to select the device features

• Audio bus serial interface master or slave select option

• Audio bus serial interface format select option

• Slave mode supports the audio bus serial interface up to 192 kHz sampling

• Slave mode supports a dynamic range enhancer (DRE) with 117-dB dynamic range for the PCM1822

• Slave mode supports decimation filters with linear-phase or low-latency filter selection

• Power-down function by means of halting the audio clocks

• Integrated high-pass filter (HPF) that removes the DC component of the input signal

• Integrated low-jitter phase-locked loop (PLL) supporting a wide range of system clocks

• Integrated digital and analog voltage regulators to support single-supply, 3.3-V operation

8.2 Functional Block Diagram

ADC

Channel-1

Digital

Decimation

Filters

with High Pass

Filter (HPF)

Audio Serial

Interface

(TDM, I2S)

BCLK

FSYNC

SDOUT

IN1M

IN1P

IN2M

IN2P

ADC

Channel-2

Regulators, Current Bias

and Voltage Reference

Clock and Timing

Controller with

Integrated PLL

www.ti.com

PCM1822

SBASAK0 – DECEMBER 2020 – REVISED MAY 2022

Copyright © 2022 Texas Instruments Incorporated

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Product Folder Links: PCM1822