SM5950AM Datasheet, PDF (13/20 Pages) Nippon Precision Circuits Inc – Asynchronous Sample Rate Converter

SM5950AM
Conversion performance
I Internal data word length: 20 bits
I Gain deviation from deemphasis filter ideal characteristic: ± 0.03dB
I Anti-aliasing filter characteristic
• Passband ripple: ± 0.0001dB
• Stopband attenuation: > 98dB
I Conversion insertion quantization noise level
• Internal computation noise: ≤ – 96dB
• Output round-off noise: 16-bit output: – 98dB
20-bit output: – 122dB
24-bit output: – 146dB
Overall theoretical output S/N ratio
Output signal
word length
16 bits
20 bits
24 bits
16-bit input
– 92.5dB
– 93.9dB
– 93.9dB
S/N ratio
20-bit input
– 94.0dB
– 96.2dB
– 96.2dB
24-bit input
– 94.0dB
– 96.2dB
– 96.2dB
Anti-aliasing filter characteristics
0
-20
-40
-60
-80
-100
-120
0
48 to 24kHz
44.1 to 32kHz
up conversion
48 to 22.05kHz
48 to 32kHz
48 to 44.1kHz
0.1
0.2
0.3
0.4
0.5
0.6
Frequency [× fsi]
Figure 1. Anti-aliasing filter characteristics
NIPPON PRECISION CIRCUITS INC.—13