REV. 0

AD1887

–7–

PIN FUNCTION DESCRIPTIONS

Digital I/O

Pin Name

TQFP

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, AD1887 Input Stream

BIT_CLK

6

O/I

AC-Link Bit Clock 12288 MHz Serial Data Clock Daisy Chain Output Clock

SDATA_IN

8

O

AC-Link Serial Data Input AD1887 Output Stream

SYNC

10

I

AC-Link Frame Sync

RESET

11

I

AC-Link Reset AD1887 Master H/W Reset

Chip Selects

Pin Name

TQFP

Type

Description

ID0

45

I

Chip Select Input 0 (Active Low)

ID1

46

I

Chip Select Input 1 (Active Low)

Analog I/O

These signals connect the AD1887 component to analog sources and sinks, including microphones and speakers

Pin Name

TQFP

I/O

Description

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

MIC

21

I

Microphone Input

LINE_IN_L

23

I

Line in Left Channel

LINE_IN_R

24

I

Line in Right Channel

HP_OUT_L

39

O

Headphones Out Left Channel

HP_OUT_R

41

O

Headphones Out Right Channel

Filter/Reference

These signals are connected to resistors, capacitors, or specific voltages

Pin Name

TQFP

I/O

Description

27

O

Voltage Reference Filter

28

O

Voltage Reference Output 5 mA Drive (Intended for Mic Bias)

AFILT1

29

O

Antialiasing Filter Capacitor—ADC Right Channel

AFLIT2

30

O

Antialiasing Filter Capacitor—ADC Left Channel

FILT_R

31

O

AC-Coupling Filter Capacitor—ADC Right Channel

FILT_L

32

O

AC-Coupling Filter Capacitor—ADC Left Channel

Power and Ground Signals

Pin Name

TQFP

Type

Description

1

I

4

I

Digital GND

7

I

Digital GND

9

I

25

I

26

I

Analog GND

38

I

40

I

Analog GND

43

I

44

I

Analog GND