SM5842AP

SM5842AP/APT NIPPON PRECISION CIRCUITS INC. High-Class Audio Multi-function Digital Filter OVERVIEW The SM5842AP/APT is a multi-function digital filter IC, fabricated using NPC’s Molybdenum-gate CMOS process, for digital audio reproduction equipment. It features 8-times oversampling (interpolation), independent left and right-channel digital deemphasis, and soft muting functions. It accepts 16, 18, 20 or 24-bit input data, and outputs data in 18, 20, 22 or 24-bit format. It operates using either a 384fs or 256fs system clock at sampling frequencies up to 48 kHz + 10% (384fs SM5842AP, 384/256fs SM5842APT). s s s s s 256fs - 13 MHz maximum frequency (at maximum fs = 50.7 kHz, SM5842AP) - 14.2 MHz maximum frequency (at maximum fs = 55.2 kHz, SM5842APT) Crystal oscillator circuit built-in TTL-compatible input/outputs 5.0 ± 0.25 V supply Molybdenum-gate CMOS process 28-pin plastic DIP Filter Configuration s FEATURES Functions s s s s s s s s s s s L/R 2-channel processing 8-times oversampling (interpolation) ≤ ±0.00002 dB passband ripple ≥ 117 dB stopband attenuation Digital deemphasis 32/44.1/48 kHz sampling frequency (fs) 2-channel independent ON/OFF control Soft muting 2-channel independent ON/OFF control Input data format 2s complement, MSB first - LR alternating, 16/18/20/24-bit serial, trailing data - LR alternating, 24-bit serial, leading data - LR simultaneous, 24-bit serial, leading data Output data format 2s complement, MSB first, LR simultaneou...