Cirrus Logic CS4398 User Manual
Page 10
10
DS568F1
CS4398
COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
The filter characteristics have been normalized to the sample rate (Fs) and can be referenced to the desired sam-
ple rate by multiplying the given characteristic by Fs.)
(See note 9.)
4. Slow Roll-off interpolation filter is only available in Control Port mode.
5. Filter response is guaranteed by design.
6. Response is clock-dependent and will scale with Fs.
7. For Single-Speed Mode, the Measurement Bandwidth is from stopband to 3 Fs.
For Double-Speed Mode, the Measurement Bandwidth is from stopband to 3 Fs.
For Quad-Speed Mode, the Measurement Bandwidth is from stopband to 1.34 Fs.
8. De-emphasis is available only in Single-Speed Mode; Only 44.1 kHz De-emphasis is available in Stand-
Alone mode.
9. Amplitude vs. Frequency plots of this data are available in the “Appendix” on page 41.
Parameter
Fast Roll-Off
Unit
Min Typ
Max
Combined Digital and On-Chip Analog Filter Response - Single-Speed Mode - 48 kHz (Note 5)
Passband (Note 6)
to -0.01 dB corner
to -3 dB corner
0
0
-
-
.454
.499
Fs
Fs
Frequency Response 10 Hz to 20 kHz
-0.01
-
+0.01
dB
StopBand
0.547
-
-
Fs
StopBand Attenuation
(Note 7)
102
-
-
dB
Group Delay
-
9.4/Fs
-
s
De-emphasis Error (Note 8)
Fs = 32 kHz
(Relative to 1 kHz)
Fs = 44.1 kHz
Fs = 48 kHz
-
-
-
-
-
-
±0.23
±0.14
±0.09
dB
dB
dB
Combined Digital and On-Chip Analog Filter Response - Double-Speed Mode - 96 kHz (Note 5)
Passband (Note 6)
to -0.01 dB corner
to -3 dB corner
0
0
-
-
.430
.499
Fs
Fs
Frequency Response 10 Hz to 20 kHz
-0.01
-
0.01
dB
StopBand
.583
-
-
Fs
StopBand Attenuation
(Note 7)
80
-
-
dB
Group Delay
-
4.6/Fs
-
s
Combined Digital and On-Chip Analog Filter Response - Quad-Speed Mode - 192 kHz (Note 5)
Passband (Note 6)
to -0.01 dB corner
to -3 dB corner
0
0
-
-
.105
.490
Fs
Fs
Frequency Response 10 Hz to 20 kHz
-0.01
-
0.01
dB
StopBand
.635
-
-
Fs
StopBand Attenuation
(Note 7)
90
-
-
dB
Group Delay
-
4.7/Fs
-
s