G-TW
-0008
476.1
.1
C3
C4
MIC_AP
MIC_AN
C1
C2
MIC_AP
MIC_AN
Figure 9.6: Single-ended Input
9.2.16 Output Stage
The output stage digital circuitry converts the signal from 16-bit per sample, linear PCM of variable sampling
frequency to bit stream, which is fed into the analogue output circuitry.
The analogue output circuit comprises a DAC, a buffer with gain-setting, a low-pass filter and a class AB output
stage amplifier. Figure 9.7 shows that the output is available as a differential signal between SPKR_LN and SPKR_LP
for the left channel, and between SPKR_RN and SPKR_RP for the right channel.
G-
T
W
-00
05537
.1.1
SPKR_LP
SPKR_LN
SPKR_RP
SPKR_RN
Figure 9.7: Speaker Output
9.2.17 Mono Operation
Mono operation is a single-channel operation of the stereo codec. The left channel represents the single mono
channel for audio in and audio out. In mono operation, the right channel is the auxiliary mono channel for dual-mono
channel operation.
In single channel mono operation, disable the other channel to reduce power consumption.
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
Page 44 of 110
CS-209182-DSP1
CSR8640 BGA
Data Sheet
