2

DS641F1

CS8421

General Description

The CS8421 is a 32-bit, high-performance, monolithic CMOS stereo asynchronous sample-rate converter.

Digital audio inputs and outputs can be 32, 24, 20, or 16-bits. Input and output data can be completely asynchro-

nous, synchronous to an external data clock, or the part can operate without any external clock by using an

integrated oscillator.

Audio data is input and output through configurable 3-wire input/output ports. The CS8421 does not require any soft-

ware control via a 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.

The CS8412 is available in a

The CS8421 is also suitable for use as an asynchronous decimation or interpolation filter. See Cirrus Logic Appli-

cation Note AN270, “Audio A/D Conversion with an Asynchronous Decimation Filter”, available at www.cirrus.com

for more details.