SM5844AF

SM5844AF NIPPON PRECISION CIRCUITS LTD. Asynchronous Sample Rate Converter APPLICATIONS s OVERVIEW The SM5844AF is a digital audio signal, asynchronous sample rate converter LSI. It reads 16 or 20-bit word length input data, and writes 16, 18, or 20-bit word length output data. It also features a built-in digital deemphasis filter and digital attenuator. The SM5844AF operates from a 5 V supply, and is available in 44-pin QFPs. s s Digital audio equipment, sample rate conversion (audiovisual amplifiers, CD-R, DAT, MD and 8 mm VTRs) Commercial recording/editing equipment, sample rate conversion Input data jitter elimination PINOUT THRUN BCKO LRCO OCLK OCKSL SLAVE DOUT DI FEATURES Functions s s s s s s PACKAGE DIMENSIONS Unit: mm 44-pin QFP 12.80 + - 0.30 10.00 s s s 12.80 + - 0.30 MLEN/DEEM OW18N DMUTE VDD s s s s s s 0.17 + - 0.05 0 to 0.20 NIPPON PRECISION CIRCUITS—1 1.75MAX Left/right-channel processing (stereo) Input sample rate (fsi) ranges 24 to 48 kHz (256fsi mode) 27 to 55 kHz (384fsi mode) Output sample rate (fso) range 20 to 100 kHz Sample rate conversion ratio (fso/fsi) 0.5 to 2.0 times Asynchronous input and output timing (clock inputs) System clock inputs (input and output clocks independent) 256fsi or 384fsi input system clock 256fso or 384fso output system clock Deemphasis filter IIR-type filter 44.1, 48 or 32 kHz Digital attenuator 11-bit data for 1025 levels Smooth, incremental attenuation change +12 dB gain shift fu...