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SM5842APT Dataheets PDF



Part Number SM5842APT
Manufacturers Nippon Precision Circuits Inc
Logo Nippon Precision Circuits Inc
Description High-Class Audio Multi-function Digital Filter
Datasheet SM5842APT DatasheetSM5842APT Datasheet (PDF)

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 eithe.

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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 simultaneous • 18/20/22/24-bit serial • BCKO burst (NPC format) Dither round-up processing • ON (dither rounding)/OFF (normal rounding) control 25-bit internal data length Jitter-free function for correct operation in the presence of jitter between the system clock and LRCI clock • ON (jitter-free mode)/OFF (sync mode) control 256fs/384fs system clock selectable • 384fs - 21.2 MHz maximum frequency (at maximum fs = 55.2 kHz) s s Linear phase 3-stage FIR interpolation filter • 169-tap 1st stage (fs to 2fs) • 29-tap 2nd stage (2fs to 4fs) • 17-tap 3rd stage (4fs to 8fs) Deemphasis filter - IIR filter configuration for accurate gain and phase characteristics 26 × 24-bit parallel multiplier/32-bit accumulator for high precision Overflow limiter built-in APPLICATIONS s s s CD players DAT players PCM systems PINOUT DI / INF2N BCKI CKSLN INF1N IW1N / DIL XTI XTO VSS CKO IW2N / DIR OW1N OW2N SYNCN RSTN 1 28 LRCI DG BCKO WCKO DOL DOR VDD DITHN MUTEL MUTER FSEL2 FSEL1 DEMPL SM5842AP/APT 14 15 DEMPR NIPPON PRECISION CIRCUITS—1 SM5842AP/APT PACKAGE DIMENSIONS Unit: mm 28-pin plastic DIP 0° to 15° 13.8 0.2 + 0.3 1.5 − 0.05 3.8 0.1 BLOCK DIAGRAM CKSLN LRCI DI / INF2N BCKI IW1N / DIL IW2N / DIR XTI XTO CKO System Clock 3.2 0.2 7.7 0.5 2.54 0.45 0.1 4.5 0.3 + 0.25− 0.10 0.05 37.3 0.3 15.2 Input Data Interface INF1N RSTN SYNCN Timing Controller Filter and Attenuation Arithmetic block DITHN DEMPL DEMPR FSEL1 FSEL2 Deemphasis Control Output Data Interface OW2N MUTEL MUTER Mute Co.


SM5842AP SM5842APT SM5843AP1


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