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OP200EZ Arkusz danych(PDF) 9 Page - Analog Devices

Numer części OP200EZ
Szczegółowy opis  Dual Low Offset, Low Power Operational Amplifier
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OP200EZ Arkusz danych(HTML) 9 Page - Analog Devices

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REV. A
OP200
–9–
PRECISION ABSOLUTE VALUE AMPLIFIER
The circuit of Figure 5 is a precision absolute value amplifier
with an input impedance of 10 M
W. The high gain and low
TCVOS of the OP200 ensure accurate operation with microvolt
input signals. In this circuit, the input always appears as a
common-mode signal to the op amps. The CMR of the OP200
exceeds 120 dB, yielding an error of less than 2 ppm.
1/2
OP200AZ
VOUT
1/2
OP200AZ
7
6
5
VIN
3
2
0V < VOUT < 10V
1
R1
1k
R3
1k
C1
30pF
D1
1N4148
C2
0.1pF
–15
D1
1N4148
R2
2k
C2
0.1pF
+15
8
4
Figure 5. Precision Absolute Value Amplifier
PRECISION CURRENT PUMP
Maximum output current of the precision current pump shown
in Figure 6 is
±10 mA. Voltage compliance is ±10 V with ±15 V
supplies. Output impedance of the current transmitter exceeds
3 M
W with linearity better than 16 bits.
1/2
OP200EZ
1/2
OP200EZ
5
6
VIN
3
2
1
R5
100
–15
+15
IOUT
7
R1
10k
R2
10k
R3
10k
R4
1k
IOUT =
=
VIN
RS
VIN
100
= 10mA/V
8
4
Figure 6. Precision Current Pump
DUAL 12-BIT VOLTAGE OUTPUT DAC
The dual output DAC shown in Figure 7 is capable of providing
untrimmed 12-bit accurate operation over the entire military
temperature range. Offset voltage, bias current and gain errors
of the OP-200 contribute less than 1/lO of an LSB error at 12
bits over the military temperature range.
OUTA
VDD
–15V
OUTB
IOUTA
IOUTB
RFBA
AGND
5V
VREFA
VREFB
DAC A/DAC B
CS
WR
DAC
CONTROL
10V
REFERENCE
VOLTAGE
DAC-8222EW
DAC A
DAC B
1/2
OP200AZ
1/2
OP200AZ
23
2
3
4
5
6
7
8
18
19
20
21
22
1
24
4
2
3
+
+
DAC DATA BUS
PINS 6(MSB) – 17(LSB)
5
1
1/2
DAC8212AV
1/2
DAC8212AV
RFBB
DGND
Figure 7. Dual 12-Bit Voltage Output DAC


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