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PDF SM5843A Data sheet ( Hoja de datos )
| Número de pieza | SM5843A | |
| Descripción | Audio Multi-function Digital Filter | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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NIPPON PRECISION CIRCUITS INC.
SM5843A×1
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 20-
bit format. It operates using either a 384fs or 256fs
system clock.
FEATURES
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
s 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)
s Soft muting
s Digital attenuator
s Input data format
• 2s complement, MSB first
- LR alternating, 16/18/20-bit serial, trailing
data
- LR alternating, 20-bit serial, leading data
- LR simultaneous, 20-bit serial, leading data
s Output data format
• 2s complement, MSB first, LR simultaneous
• 18/20-bit serial
• BCKO burst (NPC format)
s Dither processing ON/OFF control
s Jitter-free/Sync mode selectable
s 256fs/384fs system clock selectable
• 21.2/14.2MHz
maximum
frequency
(384fs/256fs)
s 5 V supply
s Crystal oscillator circuit built-in
s TTL-compatible input/outputs
s 28-pin plastic DIP and SOP
s Molybdenum-gate CMOS
APPLICATIONS
s CD players
s DAT players
s PCM systems
ORDERING INFOMATION
Device
SM5843AP1
SM5843AS1
Package
28pin DIP
28pin SOP
NIPPON PRECISION CIRCUITS—1
1 page  
SM5843A×1
Number
23
24
25
26
27
28
Name
DOR
DOL
WCKO
BCKO
TMOD2
LRCI
I/O1 Description
O Right-channel data output
O Left-channel data output
O Output word clock
O Output bit clock
Ip
Filter characteristic select pin. Sharp roll-off (response 1) when HIGH, and slow roll-off (response 2)
when LOW.
Ip Input data sample rate (fs) clock
1. I = input, Ip = Input with pull-up resistor, O = output
NIPPON PRECISION CIRCUITS—5
5 Page 
SM5843A×1
Filter Characteristics
8-times interpolation filter (sharp roll-off: response 1)
Parameter
Passband
Stopband
Passband ripple
Stopband attenuation
Group delay1
Condition
SYNCN = LOW
SYNCN = HIGH
Rating @ 256fs
0 to 0.4535fs
0.5465fs to 7.4535fs
≤ ±0.00005 dB
≥ 110 dB
44.625/fs
44.25/fs to 45.0/fs
1. The digital filter arithmetic computation time from when the completion of data input at rate fs to the start of data output at rate 8fs.
8fs filter response with deemphasis OFF
0
20
40
60
80
100
120
140
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Frequency (×fs)
8fs filter band transition response with deemphasis OFF
0
20
40
60
80
100
120
140
0.440
0.465
0.490
0.515
0.540
0.565
Frequency (×fs)
0.590
0.615
0.640
8fs filter passband response with deemphasis OFF
-0.0001
-0.00005
0.00000
0.00005
0.0001
0.000
0.125
0.250
Frequency (×fs)
0.375
0.500
NIPPON PRECISION CIRCUITS—11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SM5843A.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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| SM5843AP1 | Audio Multi-function Digital Filter | Nippon Precision Circuits Inc |
| SM5843AS1 | Audio Multi-function Digital Filter | Nippon Precision Circuits Inc |
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