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HOME>Products News>2001>News Release
2001.9.20
sm5816afIndustry's First Multi-channel DSD to PCM Converter LSI for 6-channel SACD Playback
Nippon Precision Circuits Inc. (NPC) announces the development of SM5816AF*, the industry's first multi-channel DSD (Direct Stream Digital) to PCM (Pulse Code Modulation) converter LSI for 6-channel SACD (Super Audio CD) playback, and starts its sample shipping.

DSD is the SACD signal format of a 1-bit signal stream of 64-times CD sampling-rate. By using NPC's dedicated signal processing technology, the SM5816AF performs a real-time conversion from a 6-channel DSD signal to a 6-channel PCM signal of 2-times or 8-times CD sampling-rate in one chip.

The conversion characteristics of the SM5816AF are decided by its internal decimation (down-sampling) filter coefficients. User can select the coefficients either from pre-installed coefficients or from optional coefficients that are written to the built-in SRAM by serial interface. By using the optional coefficients, the arbitrary filter characteristics are realizable.

Also, the SM5816AF has another optional functions like DSD direct-through function, DSD/PCM output independent muting and master/slave clock mode operation. By using these functions, user can realize a wide range of system configurations, making it easy to constitute a multi-channel DSD and PCM reproduction system.

The SM5816AF is suitable for multi-channel SACD playback system such as multi-channel SACD player, SACD- compatible AV amplifier and SACD- compatible DVD player.

*This SM5816AF has been developed by the supporting of Sony Corporation.

 Features
· Master clock : 512fs (fs=44.1kHz : CD sampling-rate)
· Input DSD data direct output through-mode
· 8-channel 8fs-output and through-mode output
· Clock master/slave switching for DSD input/outputs and PCM outputs
· 2fs output data, BCK and LRCK pins switchable between 2-line external data inputs and 3-line internal filter outputs.
· Decimation filter characteristics
    Fixed coefficients: 4 sets for 8fs-rate output and 1 set for 2fs-rate output
    Rewritable coefficients: 1 set either for 8fs-rate output or for 2fs-rate output
· Dither function : 8fs/24-bit output mode with switchable ON/OFF and summing position
· PCM/DSD output independent muting operation
· 8fs output format : [MSB-first, left-justified, 32-bit] or [MSB-first, right-justified, 24-bit]
· 2fs output format : [MSB-first, left-justified, 32-bit] or [IIS, 32-bit]
· DSD gain switching function (+6dB)
· System clock output pins switchable between external system clock and internal system clock
· Supply voltage: 3.3V±10%
· Operating temperature: -20 to 70°C
· Package : 80-pin QFP
 Notes
· Sample price : 2,000 yen
· Sample release : September 2001
· Product shipment : December 2001
· Amount of production : 50,000 units/month
   

For more information,
Sales Group
TEL +81-3-3642-6663  FAX +81-3-3642-6698 sales@npc.co.jp


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