AD1985

Rev. A | Page 14 of 48

Reset (Index 0x00)

Reg Num

Name

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Default

0x00

Reset

X

SE4

SE3

SE2

SE1

SE0

ID9

ID8

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

0x0090

Note: Writing any value to this register performs a register reset, which causes all registers (except Register 0x74) to revert to their default values. Register 0x74 will only

reset Bits CSWP (D3), LBKS[1:0] (D[6:5]), and OMS (D9). The REGM and serial configuration bits are reset only by an external hardware reset.

Reading this register returns the ID code of the part and a code for the type of 3D stereo enhancement.

ID[9:0] Identify Capability: The ID decodes the capabilities of AD1985 based on the following:

Bit = 1

Function

AD1985

ID0

Dedicated MIC PCM In Channel

0

ID1

Reserved (per AC ’97, 2.3)

0

ID2

Bass and Treble Control

0

ID3

Simulated Stereo (Mono to Stereo)

0

ID4

Headphone Out Support

1

ID5

Loudness (Bass Boost) Support

0

ID6

18-Bit DAC Resolution

0

ID7

20-Bit DAC Resolution

1

ID8

18-Bit ADC Resolution

0

ID9

20-Bit ADC Resolution

0

SE[4:0] Stereo Enhancement. The AD1985 does not provide hardware 3D stereo enhancement (all bits are 0).