AD1981AJST Analog Devices Inc, AD1981AJST Datasheet - Page 12

• Manufacturer Part Number: AD1981AJST
• Description: IC CODEC STEREO MICPREAMP 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1981AJST

• Data Interface: Serial
• Resolution (bits): 16, 20 b
• Number Of Adcs / Dacs: 4 / 2
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 85 / 90
• Voltage - Supply, Analog: 4.65 V ~ 5.25 V
• Voltage - Supply, Digital: 3.15 V ~ 3.45 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD1981A
RAV[4:0]
RM
LAV[4:0]
AM
ROV[4:0]
RM
LOV[4:0]
OM
RS[2:0]
LS[2:0]
NOTES
Used to select the record source independently for right and left. See table for legend.
The default value is 0000h, which corresponds to MIC in.
Reg Num Name
For AC ‘97 compatibility, Bit D7 (RM) is only available by setting the MSPLT bit Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect.
Reg Num Name
For AC ‘97 compatibility, Bit D7 (RM) is only available by setting the MSPLT bit Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect.
Reg Num Name
16h
18h
1Ah
PCM Out Vol OM X
AUX Volume
Record Select
Right AUX Volume: Allows setting the AUX right channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute: Once enabled by the MSPLT Bit in Register 76h, this bit mutes the right channel separately
from the AM bit. Otherwise, this bit will always read “0” and will have no effect when set to “1.”
Left AUX Volume: Allows setting the AUX left channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
AUX Mute: When this bit is set to “1,” both L/R channels are muted unless the MSPLT Bit in Register 76h is set
to “1,” in which case this mute bit will only affect the left channel.
Right PCM Out Volume: Allows setting the PCM right channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute: Once enabled by the MSPLT Bit in Register 76h, this bit mutes the right channel separately
from the OM bit. Otherwise, this bit will always read “0” and will have no effect when set to “1.”
Left PCM Out Volume: Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
PCM Out Volume Mute: When this bit is set to “1,” both L/R channels are muted unless the MSPLT Bit in
Register 76h is set to “1,” in which case this mute bit will only affect the left channel.
Right Record Select
Left Record Select
D15 D14 D13 D12
D15 D14 D13 D12
AM
D15 D14 D13 D12 D11 D10 D9
X
X
X LOV4 LOV3 LOV2 LOV1 LOV0 RM
X
X LAV4 LAV3 LAV2 LAV1 LAV0 RM
Mute
0
0
0
1
Record Select Control Register (Index 1Ah)
X
Volume Table (Index 0Ch to 18h)
D11
X
D11
PCM Out Volume (Index 18h)
AUX Volume (Index 16h)
X
x4...x0
00000
01000
11111
xxxxx
D10
D10
LS2 LS1 LS0 X
D9
D9
D8
D8
D8 D7 D6 D5 D4 D3 D2
Function
+12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞ dB Gain
D7 D6 D5
D7 D6 D5
X
X
X
X ROV4 ROV3 ROV2 ROV1 ROV0 8808h
X RAV4 RAV3 RAV2 RAV1 RAV0 8808h
X
D4
D4
X
D3
D3
X RS2 RS1 RS0
D2
D2
D1
D1
D1
D0 Default
D0
D0
0000h
Default
Default