OP490E View Datasheet(PDF) - Analog Devices
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OP490E Datasheet PDF : 16 Pages
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OP490
Micropower Single-Supply Quad Voltage-Output 8-Bit DAC
The circuit of Figure 6 uses the DAC8408 CMOS quad 8-bit
DAC, and the OP490 to form a single-supply quad voltage-output
DAC with a supply drain of only 140 mA. The DAC8408 is used
in voltage switching mode and each DAC has an output resistance
(ª10 kW) independent of the digital input code. The output
amplifiers act as buffers to avoid loading the DACs. The 100 kW
resistors ensure that the OP490 outputs will swing below 0.8 V
when required.
+5V
4
REFERENCE
VOLTAGE
1.5V
2
4 IOUT1A
DAC A
VREFA
2
2
1/4
DAC8408
1
1/4
OP490E
A
11
VOUTA
R1
100k⍀
5 IOUT2A/2B
6
DAC B
VREFB 8
5
6 IOUT1B
1/4
DAC8408
7
1/4
OP490E
B
VOUTB
R2
100k⍀
13
25 IOUT1C
DAC C
1/4
VREFC 27
12
DAC8408
14
1/4
OP490E
C
VOUTC
R3
100k⍀
REV. C
24 IOUT2C/2D
9
DAC 2D1
VREFD 21
10
23 IOUT1D
1/4
DAC8408
DAC DATA BUS
PIN9(LSB) – 16(MSB)
DIGITAL
CONTROL
SIGNALS
17
A/B
18
R/W
19
DS1
20
DS2
DAC8408ET
DGND
28
8
1/4
OP490E
D
OP490EY
Figure 6. Micropower Single-Supply Quad Voltage Output 8-Bit DAC
VOUTD
R4
100k⍀
–11–
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