Cirrus Logic CS4244 - Manual (Page 38)

DS900F1 38
CS4244
De-emphasis is only available in Single-speed Mode.
4.6.4 Analog Outputs
The recommended differential passive output filter is shown below. The filter has a flat frequency re-
sponse in the audio band while rejecting as much signal energy outside of the audio band as possible.
The filter has a single-pole high-pass filter to AC-couple the output signal to the load and a single-pole
low-pass filter to attenuate high-frequency energy resulting from the CS4244 DAC’s noise shaping func-
tion.
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1 F2
3.183 kHz 10.61 kHz
Figure 27. De-emphasis Curve
DAC1-4
AOUTx+
22 µF
1500 pF
470 
47 k 
C0G
AOUTx-
22 µF
1500 pF
470 
47 k 
C0G
Figure 28. Passive Analog Output Filter