OP490_15 Datasheet, PDF (13/16 Pages) Analog Devices – Low Voltage, Micropower, Quad Operational Amplifier

OP490
V_INA
C1
0.1µF _{3 RFBA}
V_INB
C2
0.1µF _{7 RFBB}
DAC A
1/4
DAC8408
V_{DD 1}
V_REFA ₂
I_{OUT1A 4}
I_{OUT2A/2B 5}
R1
2
10MΩ
3
V_REFB ₈
DAC B
1/4
DAC8408
I_{OUT1B 6}
R2
10MΩ
6
V_INC
C3
0.1µF _{25 RFBC}
V_IND
C4
0.1µF _{22 RFBD}
DAC C
1/4
DAC8408
V_REFC ₂₇
I_{OUT1C 25}
I_{OUT2C/2D 24}
DAC D
1/4
DAC8408
V_REFD ₂₁
I_{OUT1D 23}
DIGITAL
CONTROL
SIGNALS
DAC DATA BUS
PIN 9 (LSB) TO PIN 16 (MSB)
17 _A/B
18 _R/W
19 _DS1
20 _DS2
DAC8408
DGND
28
5
R3
10MΩ
9
10
R4
10MΩ
13
12
+5V
4
–
1/4
OP490
1
+A
11
–
1/4
7
OP490
+B
–
1/4
8
OP490
+C
–
1/4
OP490
14
+D
OP490
+2.5V
REFERENCE
VOLTAGE
Figure 25. Single-Supply Micropower Quad Programmable Gain Amplifier
V_OUTA
V_OUTB
V_OUTC
V_OUTD
Rev. E | Page 13 of 16