CS8421 32-Bit, 192-kHz Asynchronous Sample Rate Converter Features 175-dB Dynamic Range Bypass Mode Time Division Multiplexing (TDM) Mode 140-dB THD+N Attenuates Clock Jitter No Programming Required Multiple Device Outputs are Phase Matched No External Master Clock Required Linear Phase FIR Filter Supports Sample Rates up to 211 kHz Automatic Soft Mute/Unmute Input/Output Sample Rate Ratios of 7.5:1 to 1:8 +2.5-V Digital Supply (VD) Master Clock Support for 128 x Fs, 256 x Fs, +3.3-V or 5.0-V Digital Interface (VL) 384 x Fs, and 512 x Fs (Master Mode) Space-saving 20-pin TSSOP and QFN Packages 16-, 20-, 24-, or 32-bit Data I/O The CS8421 supports sample rates up to 211 kHz and 32-bit Internal Signal Processing is available in 20-pin TSSOP and QFN packages in both Dither Automatically Applied and Scaled to Commercial (-10 to +70C) and Automotive (-40 to Output Resolution +85C and -40 to +105C) grades. The CDB8421 Cus- Flexible 3-wire Serial Digital Audio Input and tomer Demonstration board is also available for device Output Ports evaluation and implementation suggestions. See Or- Master and Slave Modes for Both Input and dering Information on page 35 for complete details. Output RST BYPASS Level Translators TDM IN SDIN Time Serial Serial SDOUT Varying Data ISCLK Audio Audio Data Digital Data Input Output OSCLK Filters Sync Info ILRCK Sync Info OLRCK Digital SRC UNLOCK PLL MS SEL Clock MCLK OUT Serial Generator Port SAIF Mode Decoder SAOF 3.3 V or 5.0 V (VL) 2.5 V (VD) GND XTI XTO Copyright Cirrus Logic, Inc. 20042015 DS641F7 (All Rights Reserved) AUG 15 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 asynchronous, 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 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. 2 DS641F7