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SM5849 Datasheet(PDF) 1 Page - Nippon Precision Circuits Inc

No. de pieza SM5849
Descripción Electrónicos  Asynchronous Sample Rate Converter
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Fabricante Electrónico  NPC [Nippon Precision Circuits Inc]
Página de inicio  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5849 Datasheet(HTML) 1 Page - Nippon Precision Circuits Inc

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SM5849AF
NIPPON PRECISION CIRCUITS—1
NIPPON PRECISION CIRCUITS INC.
Asynchronous Sample Rate Converter
OVERVIEW
The SM5849AF is a digital audio signal, asynchronous sample rate converter LSI. It supports 16/20/24-bit
word length input data, 16/20/24-bit word length output data, 2kHz to 100kHz input sample rate range, and
4kHz to 200kHz output sample rate range. It also features a built-in digital deemphasis filter and digital attenu-
ator.
FEATURES
Functions
s
Left/right-channel processing (stereo)
s
2 to 100kHz input sample rate range (fsi)
s
4 to 200kHz output sample rate range (fso)
s
0.45 to 2.2-times variable sample rate conversion
ratio (fso/fsi)
s
Asynchronous input and output timing (clock
inputs)
s
System clock inputs (input and output clocks inde-
pendent)
• 256fsi or 384fsi input system clock select
• 256fso or 384fso output system clock select
s
Deemphasis filter
• IIR-type filter
• 44.1, 48 or 32kHz
s
Digital attenuator
• 11-bit data, 1025 levels
• Smooth attenuation change
• +12dB gain shift function
s
Direct mute function
s
Through mode operation
• Direct connection from input to output
s
Output data clocks (LRCO, BCKO)
• Slave mode: external input
• Master mode: output system clock generated
internally
s
Dither round-off processing
• Dither round-off ON/OFF selectable
s
3.3V single supply
s
80-pin QFP
s
Silicon-gate CMOS process
Filter Characteristics and Converter Efficiency
s
24-bit internal data word length
s
Deemphasis filter characteristics (IIR filter)
• ±0.03dB gain deviation from ideal filter charac-
teristics
s
Anti-aliasing LPF characteristics
• Output/input sample rate conversion ratio auto-
matic filter select (6 FIR filters)
- Up converter LPF
1.0 to 2.2 times
- Down converter LPF I
0.92 times: 48.0 to 44.1kHz
- Down converter LPF II
0.73 times: 44.1 to 32.0kHz
- Down converter LPF III
0.67 times: 48.0 to 32.0kHz
- Down converter LPF IV
0.5 times: 48.0 to 24.0kHz
- Down converter LPF V
0.45 times: 48.0 to 22.1kHz
• ±0.00005dB passband ripple
• > 110dB stopband attenuation
s
Converter noise levels
≤ −110dB internal calculation (quantization)
noise
−98dB (16-bit output), −122dB (20-bit output),
and
−146dB (24-bit output) word rounding
noise
s
Output S/N ratio (theoretical values)
Output signal
w ord length
S/N ratio
16-bit input
w ord length
20-bit input
w ord length
24-bit input
w ord length
16 bits
94.8dB
97.7dB
97.7dB
20 bits
97.7dB
109.5dB
109.7dB
24 bits
97.7dB
109.7dB
110dB


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