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AT73C240
10.9
DAC Mixer Control Register
Register Name: DAC_MC
Register Address: 0x08
Reset State: 0x09
Access: Read/Write
7
0
6
0
5
INVR
4
INVL
3
RMSMIN2
2
RMSMIN1
1
LMSMIN2
0
LMSMIN1
? LMSMIN1: Left Channel Mono/Stereo Mixer Left Mixed input enable (H to enable, L to disable)
? LMSMIN2: Left Channel Mono/Stereo Mixer Right Mixed input enable (H to enable, L to disable)
? RMSMIN1: Right Channel Mono/Stereo Mixer Left Mixed input enable (H to enable, L to disable)
? RMSMIN2: Right Channel Mono/Stereo Mixer Right Mixed input enable (H to enable, L to disable)
? INVL: Left channel mixer output invert (H to enable, L to disable)
? INVR: Right channel mixer output invert (H to enable, L to disable)
10.9.1
Digital Mixer Control
The Audio DAC features a digital mixer that allows the mixing and selection of multiple input
sources.
The mixing/multiplexing functions are described in Figure 10-1 .
Figure 10-1. Digital Mixer Functions
Left channel
Volume
Control
+
1
Volume
Control
2
To DACs
1
From digital
filters
Volume
Control
+
2
Volume
Control
Right channel
Note:
When the two mixer inputs are selected, a -6 dB gain is applied to the output signal. When only
one input is selected, no gain is applied.
25
6464A–PMAAC–28-Apr-09
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