AD1881A
Sample Rate 1 (Index 7Ah)
Reg
Num
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
7Ah Sample Rate 1 SR115 SR114 SR113 SR112 SR111 SR110 SR19 SR18 SR17 SR16 SR15 SR14 SR13 SR12 SR11 SR10 BB80h
Note: 2Ch is an alias for 7Ah. The VRA bit in register 2Ah must be set for the alias to work; if a zero is written to VRA, both sample
rates are reset to 48k.
SR1[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.
Vendor ID Registers (Index 7Ch–7Eh)
Reg
Num
Name
D15 D14 D13 D12 D11 D10 D9
D8
F0
D7
S7
D6
S6
D5
S5
D4
S4
D3
S3
D2
S2
D1
S1
D0
S0
Default
4144h
7Ch Vendor ID1
F7
F6
F5
F4
F3
F2
F1
S[7:0]
F[7:0]
This register is ASCII encoded to “A.”
This register is ASCII encoded to “D.”
Reg
Name
Num
D15 D14 D13 D12 D11 D10 D9 D8 D7
D6
D5
D4
D3
D2
D1
D0
Default
7Eh
Vendor ID2 T7
T6 T5 T4 T3 T2 T1 T0 REV7 REV6 REV5 REV4 REV3 REV2 REV1 REV0 5348h
T[7:0]
This register is ASCII encoded to “S.”
Revision Register field.
REV[7:0]
These bits are read-only and should be verified before accessing vendor defined features.
AD1881A/AD1881 USER VISIBLE DIFFERENCES
• Pin 48 is now MODE pin, no longer CHAIN_CLK.
• AD1881 chaining mode not supported.
• LSB of register 7Eh is 48h instead of 40h.
REV. 0
–20–
ADI [ ADI ]
