W681307 Datasheet, PDF (66/160 Pages) Winbond – USB1.1 CODEC Microprocessor Control Unit with 32KB Mask ROM and 4KB RAM

W681307
10.8
Digital Gain Multiplexer
There are 4 fine-tune on-chip gain stage allocated between multiplexer interface and half acoustic canceller block or behind multiplexer
interface. This gain stage is implemented by a digital multiplexer to provide a range of +12 dB to –12 dB with a resolution of 0.5 dB per
step. Figure 10-3 is shown the location of this digital gain multiplexer. The 4 channels FT Gain Stage support gain adjustment for
linear PCM signal for each PCM channel. Each channel has its independent gain registers for gain setting.
CODEC
Gain Stage
# 146Eh
C0
# 146Fh
# 146Ch
C1
Half
AEC
# 146Dh
# 146Ah
C2
#146Bh
# 1468h
C3
# 1469h
Figure 10-3 The location of digital fine-tuning gain stage
10.8.1
10.8.1.1
Fine-Tuning Gain Stage Registers
FTInGain3
Address
0x1468
Access Mode Value At Reset Nominal Value
R/W
0x00
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Publication Release Date: May, 2007
Revision 1.3