Cirrus-logic AN331 Manual de usuario descargar pdf (Pagina 4)

AN331

4

3.1 The Subtraction Approach

The schematic in Figure 3 is a suggested buffer implementation for the analog inversion with digital subtraction tech-

nique, e

o

= (A / 2) - (B / 2). The analog inversion can be easily implemented in the connections to the differential A/D

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

AINR+ and the AINL-, as shown in Figure 3. This cross connection of the analog inputs results in the inversion of

the Right channel input relative to the Left channel.

Figure 3. CS5381 Recommended Buffer Implementation for Channel Inversion

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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