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SM5849 Datasheet(PDF) 1 Page - Nippon Precision Circuits Inc |
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SM5849 Datasheet(HTML) 1 Page - Nippon Precision Circuits Inc |
1 / 26 page SM5849AF NIPPON PRECISION CIRCUITS—1 NIPPON PRECISION CIRCUITS INC. Asynchronous Sample Rate Converter OVERVIEW The SM5849AF is a digital audio signal, asynchronous sample rate converter LSI. It supports 16/20/24-bit word length input data, 16/20/24-bit word length output data, 2kHz to 100kHz input sample rate range, and 4kHz to 200kHz output sample rate range. It also features a built-in digital deemphasis filter and digital attenu- ator. FEATURES Functions s Left/right-channel processing (stereo) s 2 to 100kHz input sample rate range (fsi) s 4 to 200kHz output sample rate range (fso) s 0.45 to 2.2-times variable sample rate conversion ratio (fso/fsi) s Asynchronous input and output timing (clock inputs) s System clock inputs (input and output clocks inde- pendent) • 256fsi or 384fsi input system clock select • 256fso or 384fso output system clock select s Deemphasis filter • IIR-type filter • 44.1, 48 or 32kHz s Digital attenuator • 11-bit data, 1025 levels • Smooth attenuation change • +12dB gain shift function s Direct mute function s Through mode operation • Direct connection from input to output s Output data clocks (LRCO, BCKO) • Slave mode: external input • Master mode: output system clock generated internally s Dither round-off processing • Dither round-off ON/OFF selectable s 3.3V single supply s 80-pin QFP s Silicon-gate CMOS process Filter Characteristics and Converter Efficiency s 24-bit internal data word length s Deemphasis filter characteristics (IIR filter) • ±0.03dB gain deviation from ideal filter charac- teristics s Anti-aliasing LPF characteristics • Output/input sample rate conversion ratio auto- matic filter select (6 FIR filters) - Up converter LPF 1.0 to 2.2 times - Down converter LPF I 0.92 times: 48.0 to 44.1kHz - Down converter LPF II 0.73 times: 44.1 to 32.0kHz - Down converter LPF III 0.67 times: 48.0 to 32.0kHz - Down converter LPF IV 0.5 times: 48.0 to 24.0kHz - Down converter LPF V 0.45 times: 48.0 to 22.1kHz • ±0.00005dB passband ripple • > 110dB stopband attenuation s Converter noise levels • ≤ −110dB internal calculation (quantization) noise • −98dB (16-bit output), −122dB (20-bit output), and −146dB (24-bit output) word rounding noise s Output S/N ratio (theoretical values) Output signal w ord length S/N ratio 16-bit input w ord length 20-bit input w ord length 24-bit input w ord length 16 bits 94.8dB 97.7dB 97.7dB 20 bits 97.7dB 109.5dB 109.7dB 24 bits 97.7dB 109.7dB 110dB |
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