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PDF SM5847AF Data sheet ( Hoja de datos )
| Número de pieza | SM5847AF | |
| Descripción | High-fidelity Digital Audio/ Multi-function Digital Filter | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SM5847AF (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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SM5847AF
NIPPON PRECISION CIRCUITS INC. High-fidelity Digital Audio, Multi-function Digital Filter
OVERVIEW
The SM5847AF is a 4/8-times oversampling (inter-
polation), 2-channel, linear-phase FIR, multi-func-
tion digital filter for digital audio reproduction
equipment. It features independent left and right-
channel digital deemphasis filters and soft muting
function.
The input/output interface supports input data in
16/18/20/24-bit words, and output data in
18/20/22/24-bit words in either 4-times or 8-times
oversampling selectable output mode.
The internal system clock operates at either 192fs or
256fs selectable speed (where fs is the audio sam-
pling frequency). Plus, the divide-by 1, 2, or 4
counter settings means that external clocks of 768fs/
384fs/192fs (192fs input) and 1024fs/512fs/256fs
(256fs input) are supported.
The SM5847AF operates from a single 3 to 5 V sup-
ply, and is available in 44-pin QFP packages.
FEATURES
s Left/right-channel (2-channel processing)
s 4-times/8-times oversampling (interpolation)
• 8-times interpolation filter
- 3-stage linear-phase FIR configuration
1st stage (fs to 2fs): 169-tap
2nd stage (2fs to 4fs): 29-tap
3rd stage (4fs to 8fs): 17-tap
- ≤ ±0.00002 dB passband ripple (0 to
0.4535fs)
- ≥ 117 dB stopband attenuation (0.5465fs to
7.4535fs)
• 4-times interpolation filter
- 2-stage linear-phase FIR configuration
1st stage (fs to 2fs): 169-tap
2nd stage (2fs to 4fs): 29-tap
- ≤ ±0.00002 dB passband ripple (0 to
0.4535fs)
- ≥ 116 dB stopband attenuation (0.5465fs to
3.4535fs)
s Digital deemphasis
• IIR filter configuration
• fs = 32kHz, 44.1kHz, 48kHz
• 2-channel independent ON/OFF control
s 26 × 24-bit parallel multiplier/32-bit accumulator
s Overflow limiter
s Soft muting
• 2-channel independent ON/OFF control
s Input data format
• 2s complement, MSB first
• 3 selectable formats
- LR alternating, 16/18/20/24-bit serial, right-
justified data
- LR alternating, 24-bit serial, left-justified
data
- LR simultaneous, 24-bit serial, left-justified
data
s Output data format
• 2s complement, MSB first, LR simultaneous
• 18/20/22/24-bit serial
• BCKO burst (NPC format)
s Dither round-off processing
• Dither round-off ON/OFF selectable
s 25-bit internal data word length
s Internal system clock
• 192fs/256fs selectable
• Maximum operating frequency
192fs mode: 37 MHz max (5 V)
20.7 MHz max (3 V)
256fs mode: 27.6 MHz max (5 V)
25 MHz max (3 V)
s Jitter-free function
• Jitter-free/Sync mode selectable
s Crystal oscillator circuit built-in
s 3 to 5 V supply
s 44-pin plastic QFP
s CMOS process
ORDERING INFORMATION
Device
SM5847AF
Package
44-pin QFP
NIPPON PRECISION CIRCUITS—1
1 page  
SM5847AF
SPECIFICATIONS
Absolute Maximum Ratings
VSS = VSSAC = 0 V, VDD = VDDAC
Parameter
Supply voltage range1
Input voltage range
Storage temperature range
Power dissipation
Symbol
VDD, VDDAC
VI
T stg
PD
Condition
≤ 70 °C
≤ 85 °C
Rating
−0.3 to 6.5
VSS − 0.3 to VDD + 0.3
−55 to 125
900
700
Unit
V
V
°C
mW
1. Supply lines for VDD and V D DAC , and ground lines for VSS and V S S AC , should be connected on the printed circuit board to prevent device break-
down due to potential difference when the pow er is applied.
Recommended Operating Conditions
VSS = VSSAC = 0 V, VDD = VDDAC
Parameter
Symbol
Rating
Unit
Supply voltage range1
VDD, VDDAC
3.00 to 5.25
V
Operating temperature range
Ta
−40 to 85
°C
1. The minimum required operating voltage and consequent operating temperature vary with the maximum operating frequency and sampling mode
selected, as shown in the following table.
VSS = VSSAC = 0 V, VDD = VDDAC
Sampling frequency
fs (kHz)
Internal system clock
Mode1
Maximum operating
frequency (MHz)
192fs 37
192
256fs Not guaranteed
192fs 20.7
1082
256fs 27.6
192fs 18.5
96
256fs 25
55.23
192fs
256fs
10.6
14.2
1. Mode with internal frequency divider ratio set to 1 (CKDV1 = CKDV2 = LOW).
2. 96 kHz + 12.5% variable pitch
3. 48 kHz + 15% variable pitch
Minimum supply voltage Operating temperature
VDD,VDDAC (V)
Ta (°C)
4.75 (5.0 − 5%)
Not guaranteed
3.00 (3.3 − 10%)
4.50 (5.0 − 10%)
3.00 (3.3 − 10%)
3.00 (3.3 − 10%)
3.00 (3.3 − 10%)
3.00 (3.3 − 10%)
−40 to 70
Not guaranteed
−40 to 85
NIPPON PRECISION CIRCUITS—5
5 Page 
SM5847AF
Filter Characteristics
8-times interpolation filter
Parameter
Passband
Stopband
Passband ripple
Stopband attenuation
Group delay
Rating
0 to 0.4535fs
0.5465fs to 7.4535fs
≤ ±0.00002 dB
≥ 117 dB
Constant
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
Frequency (× fs)
8fs filter band transition response with deemphasis OFF
6.0
-0.00008
-0.00004
0.00000
0.00004
0.00008
0.000
0.125
0.250
Frequency (× fs)
0.375
8fs filter passband response with deemphasis OFF
7.0 8.0
0.500
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
NIPPON PRECISION CIRCUITS—11
11 Page | ||
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| PDF Descargar | [ Datasheet SM5847AF.PDF ] | |
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