Cirrus-logic AN331 Manual de usuario descargar pdf (Pagina 3)

AN331

3

3. Recommended Analog Input Buffers for the CS5381 in Mono-Mode

An implementation with the CS5381 requires separate input buffer stages for the differential analog inputs. A single

buffer driving both differential inputs has been shown to result in an unacceptable level of distortion. The recom-

mended buffer topologies are nearly identical to that shown on the CS5381 evaluation board, CDB5381. The sche-

matic in Figure 2 is a suggested buffer implementation for the equation e

o

= A/2 + B/2. Notice that the AIN+

connection is routed to the AINR+ and the AINL+, and the AIN- connection is routed to the AINR- and the AINL-

which results in the signals being in-phase.

Figure 2. CS5381 Recommended Buffer Implementation for Non-inverting Configuration

VQ

10 kΩ

10 kΩ

+

634 Ω

634 Ω

91 Ω

91 Ω

+

-

-

2700 pF

470 pF

470 pF

COG

COG

10 uF

10 uF

AINL+

AINL-

COG

+

634 Ω

634 Ω

91 Ω

91 Ω

+

-

-

2700 pF

470 pF

470 pF

COG

COG

AINR+

AINR-

COG

AIN-

100 kΩ

AIN+

100 kΩ

1 2 3 4 5 6 7 8

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