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SM5847 데이터시트(PDF) 1 Page - Nippon Precision Circuits Inc |
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SM5847 데이터시트(HTML) 1 Page - Nippon Precision Circuits Inc |
1 / 30 page SM5847AF NIPPON PRECISION CIRCUITS—1 NIPPON PRECISION CIRCUITS INC. High-fidelity Digital Audio, Multi-function Digital Filter OVERVIEW The SM5847AF is a 4/8-times oversampling (inter- polation), 2-channel, linear-phase FIR, multi-func- tion digital filter for digital audio reproduction equipment. It features independent left and right- channel digital deemphasis filters and soft muting function. The input/output interface supports input data in 16/18/20/24-bit words, and output data in 18/20/22/24-bit words in either 4-times or 8-times oversampling selectable output mode. The internal system clock operates at either 192fs or 256fs selectable speed (where fs is the audio sam- pling frequency). Plus, the divide-by 1, 2, or 4 counter settings means that external clocks of 768fs/ 384fs/192fs (192fs input) and 1024fs/512fs/256fs (256fs input) are supported. The SM5847AF operates from a single 3 to 5 V sup- ply, and is available in 44-pin QFP packages. FEATURES s Left/right-channel (2-channel processing) s 4-times/8-times oversampling (interpolation) • 8-times interpolation filter - 3-stage linear-phase FIR configuration 1st stage (fs to 2fs): 169-tap 2nd stage (2fs to 4fs): 29-tap 3rd stage (4fs to 8fs): 17-tap - ≤ ±0.00002 dB passband ripple (0 to 0.4535fs) - ≥ 117 dB stopband attenuation (0.5465fs to 7.4535fs) • 4-times interpolation filter - 2-stage linear-phase FIR configuration 1st stage (fs to 2fs): 169-tap 2nd stage (2fs to 4fs): 29-tap - ≤ ±0.00002 dB passband ripple (0 to 0.4535fs) - ≥ 116 dB stopband attenuation (0.5465fs to 3.4535fs) s Digital deemphasis • IIR filter configuration • fs = 32kHz, 44.1kHz, 48kHz • 2-channel independent ON/OFF control s 26 × 24-bit parallel multiplier/32-bit accumulator s Overflow limiter s Soft muting • 2-channel independent ON/OFF control s Input data format • 2s complement, MSB first • 3 selectable formats - LR alternating, 16/18/20/24-bit serial, right- justified data - LR alternating, 24-bit serial, left-justified data - LR simultaneous, 24-bit serial, left-justified data s Output data format • 2s complement, MSB first, LR simultaneous • 18/20/22/24-bit serial • BCKO burst (NPC format) s Dither round-off processing • Dither round-off ON/OFF selectable s 25-bit internal data word length s Internal system clock • 192fs/256fs selectable • Maximum operating frequency 192fs mode: 37 MHz max (5 V) 20.7 MHz max (3 V) 256fs mode: 27.6 MHz max (5 V) 25 MHz max (3 V) s Jitter-free function • Jitter-free/Sync mode selectable s Crystal oscillator circuit built-in s 3 to 5 V supply s 44-pin plastic QFP s CMOS process ORDERING INFORMATION D e vice P a ck ag e SM5847AF 44-pin QFP |
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