AD9218

Rev. C | Page 9 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

GND

S1

S2

GND

DFS/GAIN

GND

GND

GND

GND

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

AD9218

TOP VIEW

(Not to Scale)

Figure 5. Pin Configuration

Table 7. Pin Function Descriptions

Pin Number

Mnemonic

Description

GND

Ground.

1, 12, 16, 27, 29,

32, 34, 45

2

Analog Input for Channel A.

A

A

IN

3

Analog Input for Channel A (Complementary).

4

DFS/GAIN

Data Format Select and Analog Input Gain Mode. Low = offset binary output available, 1 V p-p supported;

high = twos complement output available, 1 V p-p supported; floating = offset binary output available,

2 V p-p supported; set to V

= twos complement output available, 2 V p-p supported.

REF

5

Reference Voltage Input for Channel A.

6

Internal Reference Voltage.

7

Reference Voltage Input for Channel B.

8

S1

User Select No. 1. See Table 6.

9

S2

User Select No. 2. See Table 6.

10

B

A

IN

Analog Input for Channel B (Complementary).

11

Analog Input for Channel B.

13, 30, 31, 48

Analog Supply (3 V).

14

Clock Input for Channel B.

15, 28, 33, 46

Digital Supply (2.5 V to 3.6 V).

17 to 26

D9 to D0

B

B

Digital Output for Channel B (D9 = MSB).

B

35 to 44

47

Clock Input for Channel A.