CS4330 Datasheet, PDF (13/38 Pages) Cirrus Logic – 8 Pin Stereo D/A Converter for Digital Audio

CS4330, CS4331, CS4333
mended on the analog outputs. The required ca-
pacitor value is defined by:
C
=
(2π)
(Fs)
1
(2400
Ω)
(2)
Example: Fs = 48 kHz
C = 690 pF
A value of 680 pF may be used with only 1.45%
error which is negligible.
Combined Digital and Analog Filter Response
The frequency response of the combined analog
switched-capacitor filter, digital filter, and off-
chip single pole RC-filter at 2 Fs, is shown in
Figures 9, 10, 11, and 12. The overall response
is clock dependent and will scale with Fs. Note
that the response plots have been normalized to
Fs and can be de-normalized by multiplying the
X-axis scale by Fs.
Figure 9. CS4330/31/33 Combined Digital and Analog
Filter Stopband Rejection
Figure 11. CS4330/31/33 Combined Digital and Analog
Filter Transition Band
Figure 10. CS4330/31/33 Combined Digital and Analog
Filter Transition Band
DS136F1
Figure 12. CS4330/31/33 Combined Digital and Analog
Filter Passband Ripple
13