参数资料
型号: CS5346-DQZ
厂商: CIRRUS LOGIC INC
元件分类: ADC
中文描述: 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQFP48
封装: LEAD FREE, MS-022, LQFP-48
文件页数: 17/40页
文件大小: 402K
代理商: CS5346-DQZ
24
DS861PP2
CS5346
demonstrates a simple solution. The 1800 pF capacitors in the low-pass filter should be C0G or equivalent
to avoid distortion issues
.
5.5.2
Analog Input Configuration for 2 VRMS Input Levels
The CS5346 can also be easily configured to support an external 2 VRMS input signal, as shown in
Figure 13. In this configuration, the 2 VRMS input signal is attenuated to 1.5 VRMS at the analog input with
the external 12 k
resistor and the input impedance to the network is increased to 48 k. The PGA gain
must also be configured to attenuate the 1.5 VRMS at the input pin to the 1.0 VRMS maximum A/D input level
to prevent clipping in the ADC.
36 k
VCM
9 k
to 144 k
A/ D Input
-
+
Analog Input
CS5346
Figure 10. CS5346 PGA
36 k
VCM
9 k
to 144 k
A/ D Input
-
+
2. 2 F
100 k
Analog Input
CS5346
Figure 11. 1 VRMS Input Circuit
36 k
VCM
9 k to 144 k
A/D Input
2.2 F
1800 pF
100 k
100
-
+
Analog Input
Figure 12. 1 VRMS Input Circuit with RF Filtering
36 k
VCM
9 k
to 144 k
A/ D Input
-
+
2. 2 F
18 pF
100k
12 k
Analog Input
CS5346
Figure 13. 2 VRMS Input Circuit
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