OP490
+5V
1
V
DD
R
A
3
4
FB
V A
IN
V
A
REF
2
4
C1
0.1F
R1
10M⍀
I
OUT1A
2
3
DAC A
1/4
1
V
A
OUT
DAC8408
1/4
OP490E
A
11
I
5
8
OUT2A/2B
7
R
B
FB
V B
IN
V
B
REF
C2
0.1F
R2
DAC B
1/4
10M⍀
I
6
6
5
OUT1B
DAC8408
7
V
B
OUT
1/4
OP490E
B
25
R
C
FB
V C
IN
V
C
27
25
REF
C3
0.1F
R3
10M⍀
I
9
OUT1C
DAC C
1/4
8
V
C
OUT
10
DAC8408
1/4
OP490E
C
I
24
21
OUT2C/2D
22
R
D
FB
V D
IN
V
D
REF
C4
0.1F
R4
DAC D
1/4
10M⍀
I
23
13
12
OUT1D
DAC8408
14
V
D
OUT
1/4
DAC DATA BUS
OP490E
D
PIN9(LSB) – 16(MSB)
17
18
19
20
A/B
R/W
DS1
DS2
OP490EY
DAC8408ET
+2.5V
DIGITAL
REFERENCE
VOLTAGE
CONTROL
SIGNALS
DGND
28
Figure 8. Single-Supply Micropower Quad Programmable Gain Amplifier
REV. C
–13–
ADI [ ADI ]
