AD1981HD

Rev. 0 | Page 8 of 16

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

48 47 46

45 44 43 42

41 40 39 38 37

35

PORT-D_L

34

SENSE_B/SRC_A

33

NC

30

MIC_BIAS-F

31

NC

32

MIC_BIAS-D

36

PORT-D_R

29

MIC_BIAS-C

28

MIC_BIAS-B

27

VREF_FILT

25

2

GPIO_2

3

GPIO_3

4

7

6

BIT_CLK

5

SDATA_OUT

1

8

SDATA_IN

9

10

SYNC

12

PC BEEP

11

RESET

NC = NO CONNECT

13 14

15

16

17 18 19 20 21 22

23 24

PIN 1

AD1981HD

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 15. Pin Function Descriptions

Mnemonic

Pin No.

I/O

Description

SDATA_OUT

5

I

HD Audio Link Serial Data Output. Codec input stream.

BIT_CLK

6

I

HD Audio Link Bit Clock Input. 24 MHz.

SDATA_IN

8

I/O

HD Audio Link Serial Data Input. Codec output stream.

SYNC

10

I

HD Audio Link Frame Sync.

RESET#

11

I

HD Audio Link Reset. Master hardware reset.

Table 16. Digital Input/Output Pin Function Descriptions

Mnemonic

Pin No.

I/O

Description

GPIO_2

2

I/O

General-Purpose Input/Output. Digital signal used to sense/control external circuits.

GPIO_3

3

I/O

General-Purpose Input/Output. Digital signal used to sense/control external circuits.

GPIO_0/JS_1

43

I/O

GPIO_0—General-Purpose Input/Output. Digital signal used to sense/control external circuits.

JS_1—Classic (DC) Jack Sense for Headphone Out Pins. Low indicates that nothing is plugged

into the jack; high indicates that a peripheral is plugged into the jack.

GPIO_1/JS_0

44

I/O

GPIO_1—General-Purpose Input/Output. Digital signal used to sense/control external circuits

JS_0—Classic (DC) Jack Sense for Line Out Pins. Low indicates that nothing is plugged into the

jack; high indicates that a peripheral is plugged into the jack.

SENSE_A/SRC_B

13

I/O

SENSE_A—Jack Sense A–D Input. For use with isolated switches on audio jacks.1

SENSE_B/SRC_A

34

I/O

SENSE_B—Jack Sense E–F Input. For use with isolated switches on audio jacks.1

EAPD

47

O

External Amplifier Power-Down Output.

S/PDIF_OUT

48

O

S/PDIF Output.