CS5346 datasheet(24/40 Pages) CIRRUS

24 / 40 page

DS861PP1

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

Ω resistor and the input impedance to the network is increased to 48 kΩ. 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

Ω

Analog Input

CS5346

Figure 10. CS5346 PGA

36 k

VCM

9 k

to 144 k

A/ D Input

Ω

2. 2 µF

100 k

Ω

Analog Input

CS5346

Figure 11. 1 VRMS Input Circuit

36 k

VCM

9 k

to 144 k

A/ D Input

Ω

2. 2 µF

1800 pF

100 k

Ω

100

Ω

Analog Input

CS5346

Figure 12. 1 VRMS Input Circuit with RF Filtering

36 k

VCM

9 k

to 144 k

A/ D Input

2. 2 µF

18 pF

100 k

Ω

12 k

Ω

Analog Input

Ω

CS5346

Figure 13. 2 VRMS Input Circuit

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