CS4272 查看數據表（PDF） - Cirrus Logic
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CS4272 Datasheet PDF : 53 Pages
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CS4272
5.4 Analog Connections
5.4.1 Input Connections
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 × 6.144 MHz) the digital
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.
AIN+
10 µF
10 kΩ
AIN-
10 kΩ
10 µF
0.01 µF
470 pF
634 Ω
C0G
-
91 Ω
+
634 Ω
470 pF
C0G
-
91 Ω
+
2700 pF
C0G
1 µF 0.1 µF
CS4272
AIN+
AIN-
VCOM
Figure 12. CS4272 Recommended Analog Input Buffer
3.9 V
2.5 V
1.1 V
3.9 V
2.5 V
1.1 V
CS4272
AIN+
AIN-
Full-Scale Input Level= (AIN+) - (AIN-)= 5.6 Vpp
Figure 13. Full-Scale Analog Input
32
DS593F1
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