AD1981HD

Rev. 0 | Page 9 of 16

Table 17. Analog Input/Output Pin Function Descriptions

Mnemonic

Pin No.

I/O

Channel

Description

Function1

PC Beep

12

I

N/A

Analog Input for PC Beep Pass-Through, Even While in Reset.

LI

PORT-E_L

14

I

Left

Line Input (Typically Auxiliary Input).

PORT-E_R

15

I

Right

Line Input (Typically Auxiliary Input).

LI

PORT-F_L

16

I/O

Left

Multifunction Analog I/O Jack (Typically Rear Microphone).

MIC, LI, LO

PORT-F_R

17

I/O

Right

Multifunction Analog I/O Jack (Typically Rear Microphone).

MIC, LI, LO

CD_L

18

I

Left

CD Input, Left Channel.

LI

CD_GND

19

I

Ground

CD Input, Ground.

LI

CD_R

20

I

Right

CD Input, Right Channel.

LI

PORT-B _L

21

I

Left

Multifunction Analog I/O Jack (Typically Front Microphone).

MIC, LI

PORT-B_R

22

I

Right

Multifunction Analog I/O Jack (Typically Front Microphone).

MIC, LI

PORT-C_L

23

I/O

Left

Multifunction Analog I/O Jack (Typically Rear Line Input).

MIC, LI, LO

PORT-C_R

24

I/O

Right

Multifunction Analog I/O Jack (Typically Rear Line Input).

MIC, LI, LO

PORT-D_L

35

I/O

Left

Multifunction Analog I/O Jack (Typically Rear Line Output).

MIC, LI, LO

PORT-D_R

36

I/O

Right

Multifunction Analog I/O Jack (Typically Rear Line Output).

MIC, LI, LO

MONO_OUT

37

O

-

Monaural Output to Telephony Subsystem Speakerphone.

LO

PORT-A_L

39

O

Left

Headphone Output, Left Channel.

LO, HP

PORT-A_R

41

O

Right

Headphone Output, Right Channel.

LO, HP

HP—headphone support, includes integrated headphone amplifier.

Table 18. Filter/Reference Pin Function Descriptions

Mnemonic

Pin No.

I/O

Description

VREF_FILT

27

O

Voltage Reference Filter.

MIC_BIAS-B

28

O

Programmable Microphone Bias Output. Intended for connection to Port B.

MIC_BIAS-C

29

O

Programmable Microphone Bias Output. Intended for connection to Port C.

MIC_BIAS-F

30

O

Programmable Microphone Bias Output. Intended for connection to Port F.

MIC_BIAS-D

32

O

Programmable Microphone Bias Output. Intended for connection to Port D.

Table 19. Power and Ground Pin Function Descriptions

Mnemonic

Pin No.

I/O

Description

4, 7

I

Digital Supply Return (Ground).

1, 9

I

Digital Supply Voltage (3.3 V).

26, 42

I

Analog Supply Return (Ground).

25, 38

I

Analog Supply Voltage (5.0 V).