–8–

REV. 0

AD1885–SPECIFICATIONS

PIN FUNCTION DESCRIPTIONS

Digital I/O

Pin Name

LQFP

I/O

Description

XTL_IN

2

I

Crystal (or Clock) Input, 24.576 MHz.

XTL_OUT

3

O

Crystal Output.

SDATA_OUT

5

I

AC-Link Serial Data Output, AD1885 Input Stream.

BIT_ CLK

6

O/I

AC-Link Bit Clock. 12.288 MHz Serial Data Clock. Daisy Chain Input Clock.

SDATA_IN

8

O

AC-Link Serial Data Input. AD1885 Output Stream.

SYNC

10

I

AC-Link Frame Sync.

RESET

11

I

AC-Link Reset. AD1885 Master H/W Reset.

CHIP SELECTS

Pin Name

LQFP

Type

Description

ID0

45

I

Chip Select Input 0 (Active Low).

ID1

46

I

Chip Select Input 1 (Active Low).

JACK SENSES/EAPD/GENERAL-PURPOSE DIGITAL OUTPUTS

These signals can sense the presence of audio jacks in the line-out or headphones outputs, and automatically mute the other audio

outputs. JS0 can also be programmed for EAPD control. Alternatively, both pins can be programmed as general-purpose digital outputs.

Pin Name

LQFP

Type

Description

JS0

47

I/O

JACK Sense Input 0 (Mutes Mono Output).

JS1

48

I/O

JACK Sense Input 1 (Mutes Line_Out and Mono Outputs, or Line_Out Only).

Analog I/O

These signals connect the AD1885 component to analog sources and sinks, including microphones and speakers.

Pin Name

LQFP

I/O

Description

PC_BEEP

12

I

PC Beep. PC speaker beep passthrough.

PHONE_IN

13

I

Phone Input. From telephony subsystem speakerphone or handset.

AUX_L

14

I

Auxiliary Input Left Channel.

AUX_R

15

I

Auxiliary Input Right Channel.

VIDEO_L

16

I

Video Audio Left Channel.

VIDEO_R

17

I

Video Audio Right Channel.

CD_L

18

I

CD Audio Left Channel.

CD_GND_REF

19

I

CD Audio Analog Ground Reference for Differential CD Input.

CD_ R

20

I

CD Audio Right Channel.

MIC1

21

I

Microphone 1. Desktop microphone input.

MIC2

22

I

Microphone 2. Second microphone input.

LINE_IN_L

23

I

Line In Left Channel.

LINE_IN_R

24

I

Line In Right Channel.

LINE_OUT_L

35

O

Line Out Left Channel.

LINE_OUT_R

36

O

Line Out Right Channel.

MONO_OUT

37

O

Monaural Output to Telephony Subsystem Speakerphone.

HP_OUT_L

39

O

Headphones Out Left Channel.

HP_OUT_R

41

O

Headphones Out Right Channel.