cs4271 Cirrus Logic, Inc., cs4271 Datasheet - Page 32

• Manufacturer Part Number: cs4271
• Description: 24-bit, 192 Khz Stereo Audio Codec
• Manufacturer: Cirrus Logic, Inc.

5.4
5.4.1
The analog modulator samples the input at 6.144 MHz (MCLK=12.288 MHz). The digital filter will reject signals with-
in the stopband of the filter. However, there is no rejection for input signals which are (n
passband frequency, where n=0,1,2,... Refer to Figure 12 for a recommended analog input buffer that will attenuate
any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modulators. The use
of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since
these can degrade signal linearity. Figure 13 shows the full-scale analog input levels.
32
Analog Connections
Input Connections
AINL
AINR
10 µF
10 µF
10 kΩ
10 kΩ
Figure 12. CS4271 Recommended Analog Input Buffer
3.9 V
2.5 V
1.1 V
3.9 V
2.5 V
1.1 V
+
-
+
-
Figure 13. Full-Scale Analog Input
Full-Scale Input Level = 2.8 Vpp
470 pF
470 pF
C0G
C0G
634 Ω
91 Ω
634 Ω
91 Ω
-
+
1 µF
2700 pF
2700 pF
C0G
C0G
0.1 µF
AINB
AINA
CS4271
AINA
VQ2
VQ1
VQ3
AINB
CS4271
×
6.144 MHz) the digital
CS4271
DS592F1