Cirrus-logic AN232 Bedienungsanleitung PDF herunterladen (Seite 6)

AN232

Figure 4. Single-Ended to Differential Input Buffer

8.2 Fully Differential Input Buffer

Figure 5 shows a fully differential analog input buffer. This buffer provides the proper biasing, isolation

from the switched capacitor currents, low output impedance, and anti-alias filtering. This input buffer is

unity gain, so a 5.6 Vpp differential input will provide a full-scale 5.6 Vpp differential input into the

CS5361/CS5381.

Figure 5. Fully Differential Input Buffer

1 µF

100 kΩ

3.3 kΩ

0.01 µF 100 µF

470 pF

C0G

634 Ω

91 Ω

2700 pF

C0G

0.01 µF1 µF

AIN+

AIN-

CS5361/81

AIN+

AIN-

1 µF

00 kΩ

100 kΩ

3.3 kΩ

0.01 µF100 µF

470 pF

C0G

634 Ω

91 Ω

2700 pF

C0G

AIN+

AIN-

470 pF

C0G

470 pF

C0G

CS5361/81

634 Ω

91 Ω

634 Ω

91 Ω

2700 pF

C0G

10 µF

10 kΩ

0.01 µF

1 µF

0.01 µF

100 kΩ

470 pF

C0G

470 pF

C0G

634 Ω

91 Ω

634 Ω

91 Ω

2700 pF

C0G

10 µF

10 kΩ

0.01 µF

100 kΩ

AIN+

AIN-

100 kΩ

10 µF

1 2 3 4 5 6 7

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