AD6641

Rev. 0 | Page 11 of 28

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

PD1–

VIN+

VIN–

AVDD

AVDD

AVDD

CML

AVDD

AVDD

NOTES

1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

2. THE EXPOSED PAD IS THE ONLY ANALOG GROUND

CONNECTION FOR THE CHIP. IT MUST BE CONNECTED TO PCB AGND.

AVDD

AVDD

AVDD

VREF

AVDD

SPI_VDDIO

PD0–

PD0+

PD1+

PD2–

PD2+

DRVDD

DRGND

PD3–

PD3+

PD4–

PD4+

PD5–

PD5+

PIN 1

INDICATOR

1

2

3

4

5

6

7

8

9

10

11

12

13

14

35

36

37

38

39

40

41

42

34

33

32

31

30

29

AD6641

TOP VIEW

(Not to Scale)

Figure 8. Pin Configuration for DDR LVDS Mode

Table 8. DDR LVDS Mode Pin Function Descriptions

Pin No.

Mnemonic

Description

0

EPAD

Exposed Pad. The exposed pad is the only ground connection for the chip. The pad must be

connected to PCB AGND.

1

PD0−

PD0 Data Output (LSB)—Complement.

2

PD0+

PD0 Data Output (LSB)—True.

3

PD1−

PD1 Data Output—Complement.

4

PD1+

PD1 Data Output—True.

5

PD2−

PD2 Data Output—Complement.

6

PD2+

PD2 Data Output—True.

7, 24, 47

DRVDD

1.9 V Digital Output Supply.

8, 23, 48

DRGND

Digital Output Ground.

9

PD3−

PD3 Data Output—Complement.

10

PD3+

PD3 Data Output—True.

11

PD4−

PD4 Data Output—Complement.

12

PD4+

PD4 Data Output—True.

13

PD5−

PD5 Data Output (MSB)—Complement.

14

PD5+

PD5 Data Output (MSB)—True.

15

PDOR−

Overrange Output—Complement.

16

PDOR+

Overrange Output—True.

17

SP_SDO

SPORT Output.

18, 19, 20, 28, 54

DNC

Do Not Connect. Do not connect to this pin.

21

SP_SDFS

SPORT Frame Sync Input (Slave Mode)/Output (Master Mode).

22

SP_SCLK

SPORT Clock Input (Slave Mode)/Output (Master Mode).

25

SDIO

Serial Port Interface (SPI) Data Input/Output (Serial Port Mode).

26

SCLK

Serial Port Interface Clock (Serial Port Mode).

27

CSB

Serial Port Chip Select (Active Low).

29

SPI_VDDIO

1.9 V or 3.3 V SPI I/O Supply.

30, 32, 33, 34, 37, 38, 39,

41, 42, 43, 46

AVDD

1.9 V Analog Supply.

31

VREF

Voltage Reference Input/Output. Nominally 0.75 V.

35

VIN+

Analog Input—True.

36

VIN−

Analog Input—Complement.