Datasheet
AD9218
Rev. C | Page 9 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
0
2001-005
GND
V
D
ENC
A
V
DD
GND
D9
A
(MSB)
D8
A
D7
A
D6
A
D5
A
D4
A
D3
A
D2
A
V
D
ENC
B
V
DD
GND
(MSB) D9
B
D8
B
D7
B
D6
B
D5
B
D4
B
D3
B
D2
B
S1
S2
GND
A
IN
A
A
IN
A
DFS/GAIN
A
IN
B
A
IN
B
REF
IN
A
REF
IN
B
D1
A
GND
V
DD
D1
B
D0
A
GND
GND
D0
B
GND
V
D
REF
OUT
V
D
V
DD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
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 A
IN
A Analog Input for Channel A.
AA
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 REF
IN
A Reference Voltage Input for Channel A.
6 REF
OUT
Internal Reference Voltage.
7 REF
IN
B 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
BA
IN
Analog Input for Channel B (Complementary).
11 A
IN
B Analog Input for Channel B.
13, 30, 31, 48 V
D
Analog Supply (3 V).
14 ENC
B
Clock Input for Channel B.
15, 28, 33, 46 V
DD
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 D0
A
to D9
A
Digital Output for Channel A (D9
A
= MSB).
47 ENC
A
Clock Input for Channel A.