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SM5842AP Datenblatt(PDF) 1 Page - Nippon Precision Circuits Inc

Teilenummer SM5842AP
Bauteilbeschribung  High-Class Audio Multi-function Digital Filter
Download  23 Pages
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5842AP Datenblatt(HTML) 1 Page - Nippon Precision Circuits Inc

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SM5842AP/APT
NIPPON PRECISION CIRCUITS—1
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 equip-
ment. It features 8-times oversampling (interpola-
tion), 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).
FEATURES
Functions
s
L/R 2-channel processing
s
8-times oversampling (interpolation)
≤ ±0.00002 dB passband ripple
≥ 117 dB stopband attenuation
s
Digital deemphasis
• 32/44.1/48 kHz sampling frequency (fs)
• 2-channel independent ON/OFF control
s
Soft muting
• 2-channel independent ON/OFF control
s
Input data format
• 2s complement, MSB first
- LR alternating, 16/18/20/24-bit serial, trail-
ing data
- LR alternating, 24-bit serial, leading data
- LR simultaneous, 24-bit serial, leading data
s
Output data format
• 2s complement, MSB first, LR simultaneous
• 18/20/22/24-bit serial
• BCKO burst (NPC format)
s
Dither round-up processing
• ON (dither rounding)/OFF (normal rounding)
control
s
25-bit internal data length
s
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
s
256fs/384fs system clock selectable
• 384fs
- 21.2 MHz maximum frequency (at maximum
fs = 55.2 kHz)
• 256fs
- 13 MHz maximum frequency (at maximum
fs = 50.7 kHz, SM5842AP)
- 14.2 MHz maximum frequency (at maximum
fs = 55.2 kHz, SM5842APT)
s
Crystal oscillator circuit built-in
s
TTL-compatible input/outputs
s
5.0 ± 0.25 V supply
s
Molybdenum-gate CMOS process
s
28-pin plastic DIP
Filter Configuration
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)
s
Deemphasis filter
- IIR filter configuration for accurate gain and
phase characteristics
s
26
× 24-bit parallel multiplier/32-bit accumulator
for high precision
s
Overflow limiter built-in
APPLICATIONS
s
CD players
s
DAT players
s
PCM systems
PINOUT
MUTEL
INF1N
IW2N / DIR
BCKI
DI / INF2N
LRCI
XTI
DOL
XTO
BCKO
1
15
14
CKSLN
VSS
RSTN
CKO
OW1N
OW2N
SYNCN
WCKO
DOR
IW1N / DIL
VDD
DITHN
DG
MUTER
FSEL2
FSEL1
DEMPL
DEMPR
28


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