AD1849K

REV. A

–7–

PIN FUNCTION DESCRIPTIONS

Digital Signals

Pin Name

PLCC

I/O

Description

SDRX

1

I

Receive Serial Data Pin

SDTX

44

O

Transmit Serial Data Pin

SCLK

43

I/O

Bidirectional Serial Bit Clock

FSYNC

42

O

Frame Sync Output Signal

TSOUT

41

O

Chaining Word Output

TSIN

40

I

Chaining Word Input

D/

C

35

I

Data/Control Select Input

CIN1

6

I

Crystal 1 Input

COUT1

7

O

Crystal 1 Output

CIN2

10

I

Crystal 2 Input

COUT2

11

O

Crystal 2 Output

CLKIN

4

I

External Sample Clock Input (256

CLKOUT

5

O

External Sample Clock Output (256

PDN

13

I

Power Down Input (Active HI)

RESET

12

I

Reset Input (Active LO)

PIO1

37

I/O

Parallel Input/Output Bit 1

PIO0

36

I/O

Parallel Input/Output Bit 0

Analog Signals

Pin Name

PLCC

I/O

Description

LINL

18

I

Left Channel Line Input

LINR

16

I

Right Channel Line Input

MINL

17

I

Left Channel Microphone Input (–20 dB from Line Level if MB = 0 or Line Level if MB = 1)

MINR

15

I

Right Channel Microphone Input (–20 dB from Line Level if MB = 0 or Line Level if MB = 1)

LOUT0L

32

O

Left Channel Line Output 0

LOUT0R

33

O

Right Channel Line Output 0

LOUT1L

31

O

Left Channel Line Output 1

LOUT1R

29

O

Right Channel Line Output 1

LOUT1C

30

I

Common Return Path for Large Current from External Headphones

MOUT

27

O

Mono Speaker Output

MOUTR

28

I

Mono Speaker Output Return

C0

14

O

External 1.0

µF Capacitor (±10%) Connection

C1

20

O

External 1.0

µF Capacitor (±10%) Connection

N/C

26

No Connect (Do Not Connect)

N/C

34

No Connect (Do Not Connect)

21

O

Voltage Reference (Connect to Bypass Capacitor)

CMOUT

19

O

Common Mode Reference Datum Output (Nominally 2.25 V)

Power Supplies

Pin Name

PLCC

I/O

Description

23 and 24

I

Analog Supply Voltage (5 V)

GNDA

22 and 25

I

Analog Ground

3, 8, 38

I

Digital Supply Voltage (5 V)

GNDD

2, 9, 39

I

Digital Ground