AD1881A
Miscellaneous Control Bits (Index 76h)
Reg
Name
D15
D14
D13 D12
D11
D10
D9 D8
D7
D6
D5
D4 D3 D2
D1 D0
Default
Num
DAC LPMI
MOD SRX10 SRX8
76h
Misc Control Bits
X
DAM DMS DLSR
X
ALSR
X
X
DRSR
X
ARSR 0404h
Z
X
EN
D7
D7
ARSR
DRSR
ADC right sample generator select
0 = SR0 Selected (32h)
1 = SR1 Selected (2Ch).
DAC right sample generator select
0 = SR0 Selected (32h)
1 = SR1 Selected (2Ch).
SRX8D7
SRX10D7
MODEN
ALSR
Multiply SR1 rate by 8/7.
Multiply SR1 rate by 10/7. SRX10D7 and SRX8D7 are mutually exclusive; SRX10D7 has priority if both are set.
Modem filter enable (left channel only). Change only when DACs are powered down.
ADC left sample generator select
0 = SR0 Selected (32h)
1 = SR1 Selected (2Ch).
DLSR
DMS
DAC left sample generator select
0 = SR0 Selected (32h)
1 = SR1 Selected (2Ch).
Digital Mono Select.
0 = Mixer
1 = Left DAC and Right DAC.
DAM
Digital Audio Mode. DAC Outputs bypass analog mixer and sent directly to the codec output.
Low Power Mixer. Keeps CD to LINE_OUT alive for notebook applications.
Zero fill (vs. repeat) if DAC is starved for data.
LPMIX
DACZ
Sample Rate 0 (Index 78h)
Reg
Num
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
78h Sample Rate 0 SR015 SR014 SR013 SR012 SR011 SR010 SR09 SR08 SR07 SR06 SR05 SR04 SR03 SR02 SR01 SR00 BB80H
Note: 32h is an alias for 78h. The VRA bit in register 2Ah must be set for the alias to work; if a zero is written to VRA then both
sample rates are reset to 48k.
SR0[15:0]
Writing to this register allows the user to program the sampling frequency from 7 kHz (1B58h) to 48 kHz (BB80h)
in 1 Hertz increments. Programming a value greater than 48 kHz or less than 7 kHz may cause unpredictable results.
REV. 0
–19–
ADI [ ADI ]
