REV. 0

AD9975

–5–

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although the

AD9975 features proprietary ESD protection circuitry, permanent damage may occur on devices

subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended

to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

PIN CONFIGURATION

1

OSC IN

2

SENABLE

3

SCLK

4

SDATA

5

AVDD

6

AVSS

7

TX+

8

TX–

9

AVSS

10

FS ADJ

11

REFIO

12

CLKVDD

36

DRVSS

35

DRVDD

34

RXBOOST/SDO

33

CLKOUT2

32

RXCLK

31

TXCLK

30

TXEN

29

RXEN

28

ADIO0

27

ADIO1

26

ADIO2

25

ADIO3

AD9975

48-PIN LQFP

TOP VIEW

(Not to Scale)

PIN FUNCTION DESCRIPTION

Pin No.

Mnemonic

Function

1OSC IN

Crystal Oscillator Inverter Input

2

SENABLE

Serial Bus Enable Input

3

SCLK

Serial Bus Clock Input

4

SDATA

Serial Bus Data I/O

5, 38, 47

AVDD

Analog 3.3 V Power Supply

6, 9, 39, 42,

AVSS

Analog Ground

43, 46

7Tx+

Transmit DAC + Output

8

Tx–

Transmit DAC – Output

10

FS ADJ

DAC Full-Scale Output Current

Adjust with External Resistor

11

REFIO

DAC Band Gap Decoupling Node

12

CLKVDD

Power Supply for CLKOUT1

13

DVSS

Digital Ground

14

DVDD

Digital 3.3 V Power Supply

15–17

AGC[2:0]

AGC Control Inputs

18

CLKOUT1

Auxiliary Clock Output

19–28

ADIO[9:0]

Digital Data I/O Port

29

RXEN

ADIO Direction Control Input

30

TXEN

TX Path Enable

31

TXCLK

ADIO Sample Clock Input

32

RXCLK

ADIO Request Clock Input

33

CLKOUT2

Auxiliary Clock Output

34

RXBOOST/

External Gain Control Output/

SDO

Serial Data Output

35

DRVDD

Digital I/O 3.3 V Power Supply

36

DRVSS

Digital I/O Ground

37

RESET

Reset Input

40, 41

REFB, REFT ADC Reference Decoupling Node

44

Rx+

Receive Path + Input

45

Rx–

Receive Path – Input

48

XTAL

Crystal Oscillator Inverter Output

ORDERING GUIDE

Model

Temperature Range

Package Description

Package Option

AD9975ABST

–40ºC to +85ºC

48-Lead LQFP

ST-48

AD9975ABSTEB

–40ºC to +85ºC

AD9975 EVAL Board

AD9975ABSTRL

–40ºC to +85ºC

AD9975ABST Reel