CX20921 datasheet(9/35 Pages) CONEXANT

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CX20921 AudioSmart Data Sheet

Features

Conexant Confidential

03/11/15

001DSR01

Interfaces

•

Universal Serial Bus (USB) 2.0 full-speed USB Audio Class (UAC):

–

Supports up to five endpoints

–

Fully configurable endpoints

•

Stereo digital microphone Pulse Density Modulated (PDM) interface (muxed pin):

–

Clock frequency = 1.536MHz and 3.072MHz

–

Supported sample rates = 8kHz to 96kHz

–

Available gain boost range from 0dB to 48dB in 12dB steps

•

I2S:

–

Output supports:

■ Four-channel I2S output available through pin muxing

■ Three-wire or six-wire digital audio interface

■ Master and slave configuration

■ 8kHz up to 192kHz sample rates

■ 8-bit, 16-bit, and 24-bit sample width

■ Left-justified and Right-justified mode (I2S only)

–

Input supports:

■ Six-channel I2S available through pin muxing

■ Four-wire or five-wire digital audio interface

■ Master and slave configuration

■ 8kHz up to 192kHz sample rates

■ 8-bit, 16-bit, and 24-bit sample width

■ Left-justified and Right-justified mode (I2S only)

•

SPI master:

–

Five-wire interface with two slave chip select outputs

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Second slave chip select is optional through pin muxing

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Maximum clock frequency up to 50MHz

•

I2C slave:

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Maximum clock frequency of 1MHz

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Control and boot

•

One Universal Asynchronous Receiver/Transmitter (UART) interface—Maximum baud rate up to

1.5625Mbps

•

Sony/Philips Digital Interface Format (S/PDIF) Receiver (RX) (muxed pin) that supports sample rates

from 44.1kHz up to 192kHz

•

One dedicated General Purpose Input/Output (GPIO)—One multiplexed with I2S_TX_CLK_2

Clocks

•

24MHz crystal clock

•

On-chip programmable Phase Locked Loops (PLLs)—Five internal PLLs for the audio processor

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