SM5950BM NPC, SM5950BM Datasheet - Page 14

• Manufacturer Part Number: SM5950BM
• Description: Asynchronous Sample Rate Converter
• Manufacturer: NPC

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Deemphasis (DEEM)
Basic deemphasis filters are realized using analog circuit configurations. Here, an IIR digital deemphasis filter
configuration faithfully reproduces the gain and phase characteristics of an analog deemphasis filter. The filter
coefficients are set by pins FS0 and FS1 for 3 input sampling frequencies (fsi) of 44.1kHz, 48.0kHz, and
32.0kHz.
Deemphasis ON/OFF
Deemphasis filter coefficient selection
The deemphasis filter is selected by pins FS0 and FS1.
Deemphasis filter characteristics
DEEM
FS0
H
H
H
L
L
L
-10.0
-12.0
-2.0
-4.0
-6.0
-8.0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0.0
0
10
10
Deemphasis
Figure 2. Deemphasis filter frequency characteristics
OFF
FS1
ON
Figure 3. Deemphasis filter phase characteristics
H
H
L
L
100
100
SM5950BM
44.1kHz
44.1kHz
48.0kHz
32.0kHz
Frequency [Hz]
Frequency [Hz]
fsi
1000
1000
10000
10000
SEIKO NPC CORPORATION —14
48kHz
44.1kHz
32kHz
44.1kHz
48kHz
32kHz
100000
100000