CS8422 datasheet(24/82 Pages) CIRRUS

24 / 82 page

DS692PP2

CS8422

4. OVERVIEW

The CS8422 is a 24-bit, high performance, monolithic CMOS stereo asynchronous sample rate converter with inte-

grated digital audio interface receiver that decodes audio data according to EIAJ CP1201, IEC-60958, AES3, and

S/PDIF interface standards.

Audio data is input through either a 3-wire serial audio port or the AES3-compatible digital interface receiver. Audio

data is output through one of two 3-wire serial audio output ports. The serial audio ports are capable of 24-, 20-, 18-

, or 16-bit word lengths. Data in to the digital interface receiver can be up to 24-bit. Input and output data can be

completely asynchronous, synchronous to an external data clock through XTI, or synchronous to the master clock

recovered from the incoming S/PDIF or AES3 data.

CS8422 can be controlled either in Software Mode or in a stand-alone Hardware Mode. In Software Mode, the user

can control the device through either a SPI or I²C control port.

Target applications include digital recording systems (DVD-R/RW, CD-R/RW, PVR, DAT, MD, and VTR), digital mix-

ing consoles, high quality D/A, effects processors, computer audio systems, and automotive audio systems.

Figure 7 and Figure 8 show typical connections to the CS8422.

5. THREE-WIRE SERIAL INPUT/OUTPUT AUDIO PORT

The CS8422 provides two independent 3-wire serial audio output ports, and a 3-wire serial audio input (only avail-

able in Software Mode). The interface format should be chosen to suit the attached device either through the control

port in Software Mode, or through the MS_SEL and SAOF pins in Hardware Mode. The following parameters are

adjustable:

Hardware Mode

•

Master or slave mode operation

•

Master-mode MCLK-to-OLRCK (OLRCK1 and OLRCK2) ratios: 128, 256, and 512

•

Audio data resolution of 16, 20, or 24 bits

•

Left-justified, I²S, or Right-justified serial data formats

•

Multi-channel TDM serial audio format (Serial Audio Output 1 only)

Software Mode

•

Master or slave mode operation

•

Master-mode MCLK-to-ILRCK and MCLK-to-OLRCK (OLRCK1 and OLRCK2) ratios: 64, 128, 192, 256,

384, 512, 768, and 1024

•

Audio data resolution of 16, 18, 20, or 24 bits

•

Left-justified, I²S, or Right-justified serial data formats

•

Multi-channel TDM serial audio format

•

AES3 Direct Output format

Figures 9, 10, 11, and 12 show the standard input/output formats available. The TDM serial audio format is de-

scribed in Section 5.1.5 on page 27. For more information about serial audio formats, refer to the Cirrus Logic ap-

plications note AN282, “The 2-Channel Serial Audio Interface: A Tutorial”, available at www.cirrus.com.

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