SM5843AP1

SM5843A×1 NIPPON PRECISION CIRCUITS INC. Audio Multi-function Digital Filter OVERVIEW The SM5843A×1 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), digital deemphasis and soft muting functions. It accepts 16, 18, or 20-bit input data, and outputs data in 18 or 20bit format. It operates using either a 384fs or 256fs system clock. s s s s s 5 V supply Crystal oscillator circuit built-in TTL-compatible input/outputs 28-pin plastic DIP and SOP Molybdenum-gate CMOS APPLICATIONS s s s CD players DAT players PCM systems FEATURES s s s s s s s s s Filter configuration (2-channel processing) 8-times oversampling (interpolation) - 3-stage FIR configuration Deemphasis filter - IIR filter configuration for correct gain and phase characteristics - 2-channel independent ON/OFF control - 32/44.1/48 kHz sampling frequency (fs) 21 × 22-bit parallel multiplier/25-bit accumulator for high precision Overflow limiter 2 oversampling filter characteristics Sharp roll-off characteristic (response 1) - ≤ ±0.00005 dB passband ripple (0 to 0.4535fs) - ≥ 110 dB stopband attenuation (0.5465fs to 7.4535fs) Slow roll-off characteristic (response 2) - ≤ ±0.00003 dB passband ripple (0 to 0.235fs) - ≥ 77 dB stopband attenuation (0.745fs to 7.255fs) Soft muting Digital attenuator Input data format 2s complement, MSB first - LR alternating, 16/18/20-bit serial,...