AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 24

• Manufacturer Part Number: AD1985JST
• Description: IC CODEC STEREO 6-DAC 20B 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1985JST

• Rohs Status: RoHS non-compliant
• Data Interface: Serial
• Resolution (bits): 16, 20 b
• Number Of Adcs / Dacs: 2 / 6
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 84 / 90
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.97 V ~ 3.63 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP

Reg Num
0x20
AD1985
General Purpose Register (Index 0x20)
LPBK
MS
MIX
DRSS[1:0]
Name
General Purpose
Register 0x74] to enable output line sharing for the microphone inputs.)
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
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
0
0
0
0
1
1
1
1
Mono Output Select. Selects mono output audio source.
0 = Mixer Output. Default.
1 = Selected MIC Channel (Selected Channel Is Unaffected by 2CMIC Setting).
MIX
0
1
1
1
1
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.
2CMIC
0
0
1
1
0
0
1
1
OMS
X
0
0
1
1
D15 D14 D13 D12 D11
X
X
MS
0
1
0
1
0
1
0
1
MS
X
0
1
0
1
X
Left Channel
MIC1 (mono)
MIC2 (mono)
MIC1 (stereo)
MIC2 (stereo)
CENTER (mono)
LFE (mono)
CENTER (stereo)
LFE (stereo)
Mono Output
Mixer_mono (default)
MIC1 (mono)
MIC2 (mono)
CENTER (mono)
LFE (mono)
X
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DRSS1
D10
DRSS0
D9
MIX MS LPBK X
D8 D7
Right Channel
MIC1 (mono)
MIC2 (mono)
MIC2 (stereo)
MIC1 (stereo)
CENTER (mono)
LFE (mono)
LFE (stereo)
CENTER (stereo)
D6 D5 D4 D3 D2 D1 D0 Default
X
X
X
X
X
X
0x0000