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AD1985 Datasheet(PDF) 24 Page - Analog Devices

Part # AD1985
Description  AC ??7 SoundMAX Codec
PDF  48 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD1985 Datasheet(HTML) 24 Page - Analog Devices

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AD1985
Rev. A | Page 24 of 48
General Purpose Register (Index 0x20)
Reg Num
Name
D15 D14 D13 D12 D11
D10
D9
D8 D7
D6 D5 D4 D3 D2 D1 D0 Default
0x20
General Purpose
X
X
X
X
DRSS1
DRSS0
MIX MS LPBK
X
X
X
X
X
X
X
0x0000
LPBK
Loopback Control. This bit enables the digital internal loopback from the ADC to the front DAC. This feature is
normally used for testing and troubleshooting. See LBKS bits in Register 0x74 for changing the loopback path to
use the surround or center/LFE DACs.
MIC Select. Selects MIC input into the record selector input and also selects the input to the analog mixer.
(See the 2CMIC [Bit D7 Register 0x76] to enable simultaneous dual microphone recording, and the OMS [Bit D9
Register 0x74] to enable output line sharing for the microphone inputs.)
The following chart shows which of the codec I/O pins are used for the microphone source from the various
settings of the microphone control bits.
OMS
2CMIC
MS
Left Channel
Right Channel
0
0
0
MIC1 (mono)
MIC1 (mono)
0
0
1
MIC2 (mono)
MIC2 (mono)
0
1
0
MIC1 (stereo)
MIC2 (stereo)
0
1
1
MIC2 (stereo)
MIC1 (stereo)
1
0
0
CENTER (mono)
CENTER (mono)
1
0
1
LFE (mono)
LFE (mono)
1
1
0
CENTER (stereo)
LFE (stereo)
MS
1
1
1
LFE (stereo)
CENTER (stereo)
Mono Output Select. Selects mono output audio source.
0 = Mixer Output. Default.
1 = Selected MIC Channel (Selected Channel Is Unaffected by 2CMIC Setting).
MIX
OMS
MS
Mono Output
0
X
X
Mixer_mono (default)
1
0
0
MIC1 (mono)
1
0
1
MIC2 (mono)
1
1
0
CENTER (mono)
MIX
1
1
1
LFE (mono)
DRSS[1:0]
Double Rate Slot Select. The DRSS bits specify the slots for the n + 1 sample outputs. PCM L (n + 1) and
PCM R (n + 1) data are by default provided in output slots 10 and 11.
00: PCM L, R n + 1 data is on slots 10, 11 (reset default).
01: PCM L, R n + 1 data is on slots 7, 8.
10: Reserved.
11: Reserved.



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