SM5844 NPC [Nippon Precision Circuits Inc], SM5844 Datasheet - Page 2

• Manufacturer Part Number: SM5844
• Description: Asynchronous Sample Rate Converter
• Manufacturer: NPC [Nippon Precision Circuits Inc]

Filter Characteristics and Converter
Efficiency
Output signal word
20-bit internal data word length
Deemphasis filter characteristics (IIR filter)
• ±0.03 dB gain deviation from ideal filter
Converter noise levels
•
•
Anti-aliasing LPF characteristics (4 FIR filters)
with
conversion ratio selection
• Up converter LPF (1.0 to 2.0 times)
• Down converter LPF 1 (48.0 to 44.1 kHz or
• Down converter LPF 2 (44.1 to 32.0 kHz or
• Down converter LPF 3 (48.0 to 32.0 kHz or
Output S/N ratio (theoretical values)
characteristics
and
noise
0.92 times)
0.73 times)
0.67 times)
98 dB (16-bit output), 110 dB (18-bit output)
length
16 bits
18 bits
20 bits
110 dB internally-generated noise
automatic
122 dB (20-bit output) word rounding
16-bit input word
output/input
94.8 dB
97.5 dB
97.7 dB
length
S/N ratio
20-bit input word
sample
106 dB
109 dB
length
97 dB
rate
SM5844AF
Interfaces
Input data format
• 2s-complement, L/R alternating, serial
• Normal format (non IIS)
Output data format
• 2s-complement, MSB first, L/R alternating,
• Continuous bit clock
M o d e
M o d e
serial
1
2
3
4
1
2
3
4
5
6
7
W ord length
W ord length
16 bits
20 bits
16 bits
18 bits
20 bits
20 bits
16 bits
18 bits
20 bits
NIPPON PRECISION CIRCUITS—2
IIS selection
Nor mal (non
Front/rear
p a cking
Rear
Front
Rear
IIS)
IIS
s e q u e n c e
Front/rear
M S B fi rst
p a cking
LSB first
Data
Rear
Front