8 Detailed Description

8.1 Overview

The PCM182x 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, battery-powered, consumer, home, and industrial 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 PCM182x also supports a power-down and reset function by means of halting the

system clock.

The PCM182x 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 123-dB dynamic range for the PCM1820

• 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

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PCM1820, PCM1821

SBASA61A – DECEMBER 2020 – REVISED JUNE 2021

Copyright © 2021 Texas Instruments Incorporated

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Product Folder Links: PCM1820 PCM1821