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| CS4340 CS4341 24-Bit, 96-kHz Stereo D/A Converter for Audio The following information is based on the technical data sheet: CS4340 DS297PP1 OCT `98 CS4341 DS298PP1 OCT `98 Please contact Cirrus Logic for further information. 352'8&7 ,1)250$7,21 Copyright (c) Cirrus Logic, Inc. 1999 (All Rights Reserved) PI297PP1 APR `99 Sales Office and Applications Support Contacting Cirrus Logic Support For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at: www.cirrus.com For further information on Cirrus Logic products, please visit our website "www.cirrus.com" or call our literature department (800) 888-5016 ext. 3594 or (512) 912-3594 for data sheets and application notes. CS4340 CS4341 Features 24-Bit, 96-kHz Stereo D/A Converter for Audio Features q Complete stereo DAC system: interpolation, D/A, output analog q q q q q q q q q Filtering 102 dB dynamic range 90 dB THD+N Low clock jitter sensitivity +3 V to +5 V power supply Filtered line level outputs On-chip digital de-emphasis for 32, 44.1, and 48 kHz 30 mW with 3 V supply PopGuardTM Technology Volume Control (CS4341) -- 1 dB steps -- 90 dB attenuation -- zero crossing steps Description The CS4340 and CS4341 are complete stereo digital-to-analog systems including digital interpolation, volume control (CS4341 only), fourth-order deltasigma digital-to-analog conversion, digital de-emphasis and switched capacitor analog filtering. The advantages of this architecture include: ideal differential linearity, no distortion mechanisms due to resistor matching errors, no linearity drift over time and temperature and a high tolerance to clock jitter. The CS4340 and CS4341 accept data at audio sample rates from 2 kHz to 100 kHz, consume very little power, and operate over a wide power supply range. The features of the CS4340 and CS4341 are ideal for DVD players, CD players, MP3 players, AV Recievers, and set-top box systems. PI297PP1 APR `99 1 CS4340 CS4341 Block Diagrams Block Diagrams CS4340 SCLK/DEM1 DEM0 MUTEC RST DE-EMPHASIS EXTERNAL MUTE CONTROL INTERPOLATION FILTER SERIAL INPUT INTERFACE LRCK INTERPOLATOR FILTER SDATA DAC ANALOG FILTER AOUTL DAC ANALOG FILTER AOUTR DIF0 DIF1 MCLK CS4341 SCL/CCLK SDA/CDIN AD0/CS MUTEC External Mute Control Volume Control DAC Analog Filter AOUTA Control Port RST Interpolation Filter Serial Port SCLK LRCK SDATA Mixer Interpolation Filter Volume Control DAC Analog Filter AOUTB MCLK 2 PI297PP1 APR `99 CS4340 CS4341 Overview Overview The CS4340 and CS4341 include a unique set of tools to deal with the extraneous signal artifacts that can occur in any single supply system as well as muting and conversion errors. PopGuardTM Technology Pop Guard technology allows the single-ended outputs to slowly ramp to the quiescent voltage during power-on or to 0 volts during power-off. This feature can be used to eliminate audible `clicks' and `pops'. Please refer to the applications section of the product Data Sheet for details of implementing this feature. External Mute Control The Mute Control pin goes high during power-up initialization, reset, muting, master clock to left/right clock frequency ratio errors or power-down. The Mute Control output will go active following the reception of 8192 consecutive audio samples of static 0 or -1. A single sample of non-static data will release the mute. The quiescent voltage on the output will be retained while the Mute Control pin is active during the Auto-Mute period. Use of Mute Control is not mandatory but recommended for designs requiring the absolute minimum in extraneous `clicks' and `pops'. FAQs 1) A: What is the benefit of switched capacitor analog filter architecture? Clock Jitter is common in audio systems and it degrades D/A converter performance. Switched capacitor filters are less sensitive to clock jitter than continuous time filters; therefore it is easier for a designer to use the CS4340/41 and achieve the target specifications of the D/A converter and the total audio system. What is the advantage of PopGuardTM Technology? Single ended D/A converters create audible noise when powered on/off. This noise is commonly referred to as `clicks' and `pops'. A system 2) A: PI297PP1 APR `99 3 CS4340 CS4341 Ordering Information designer using a traditional D/A converter must use external mute circuitry to attenuate this noise. The CS4340/41 integrate patented PopGuard Technology that eliminates this noise and reduces system cost, board space, and complexity. Ordering Information Model Number Temperature Range Package CS4340-KS CS4341-KS CDB4340 -10 to 70 C -10 to 70 C 16-pin SOIC 16-pin SOIC Evaluation Board 4 PI297PP1 APR `99 CS4340 CS4341 PI297PP1 APR `99 5 PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.cirrus.com |
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