AD6644

–6–

REV. 0

PIN FUNCTION DESCRIPTIONS

Pin No.

Name

Function

1, 33, 43

3.3 V Power Supply (Digital) Output Stage Only.

2, 4, 7, 10, 13, 15, 17, 19, 21, 23,

GND

Ground.

25, 27, 29, 34, 42

2.4 V (Analog Reference). Bypass to ground with 0.1

µF microwave

chip capacitor.

5

ENCODE

Encode Input; conversion initiated on rising edge.

6

ENCODE

Complement of ENCODE; differential input.

8, 9, 14, 16, 18, 22, 26, 28, 30

5 V Analog Power Supply.

11

AIN

Analog Input.

12

AIN

Complement of AIN; Differential Analog Input.

20

C1

Internal Voltage Reference; bypass to ground with 0.1

µF microwave

chip capacitor.

24

C2

Internal Voltage Reference; bypass to ground with 0.1

µF microwave

chip capacitor.

31

DNC

Do not connect this pin.

32

OVR

Overrange Bit; high indicates analog input exceeds

±FS.

35

DMID

Output Data Voltage Midpoint; approximately equal to (DVCC)/2.

36

D0 (LSB)

Digital Output Bit (Least Significant Bit); Two’s Complement

37–41, 44–50

D1–D5, D6–D12

Digital Output Bits in Two’s Complement.

51

D13 (MSB)

Digital Output Bit (Most Significant Bit); Two’s Complement.

52

DRY

Data Ready Output.

PIN CONFIGURATION

40

41

42

43

44

45

46

47

48

49

50

51

52

14 15 16 17 18 19 20 21 22 23 24 25 26

1

2

3

4

5

6

7

8

9

10

11

12

13

27

28

29

30

31

32

33

34

35

36

37

38

39

PIN 1

IDENTIFIER

TOP VIEW

(Not to Scale)

DNC = DO NOT CONNECT

GND

GND

ENCODE

ENCODE

GND

GND

AIN

AIN

GND

D3

D2

D1

D0 (LSB)

DMID

GND

OVR

DNC

GND

GND

AD6644