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參數資料
| 型號： | OP497 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Picoampere Input Current Quad Operational Amplifier |
| 中文描述： | 精密Picoampere輸入電流四路運算放大器 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 302K |
| 代理商： | OP497 |
REV. D
OP497
–8–
OPEN-LOOP GAIN LINEARITY
The OP497 has both an extremely high gain of 2000 V/mv mini-
mum and constant gain linearity. This enhances the precision of
the OP497 and provides for very high accuracy in high closed-loop
gain applications. Figure 5 illustrates the typical open-loop gain
linearity of the OP 497 over the military temperature range.
15
–
10
–
15
10
5
0
–
5
OUTPUT VOLTAGE
–
Volts
D
–
R
L
= 10k
V
S
= 15V
V
CM
= 0V
T
A
= +25C
T
A
=
–
55 C
T
A
= +125 C
Figure 5. Open-Loop Linearity of the OP497
APPLICATIONS
Precision Absolute Value Amplifier
The circuit of Figure 6 is a precision absolute value amplifier
with an input impedance of 30 M
. The high gain and low
TCV
OS
of the OP497 ensure accurate operation with microvolt
input signals. In this circuit, the input always appears as a com-
mon-mode signal to the op amps. The CMR of the OP497
exceeds 120 dB, yielding an error of less than 2 ppm.
+15V
2
3
V
IN
–
15V
4
C3
0.1 F
8
1
6
5
7
0V < V < 10V
D1
1N4148
R3
1k
R1
1k
C2
0.1 F
C1
30pF
D2
1N4148
R2
2k
1/4
OP497
1/4
OP497
Figure 6. Precision Absolute Value Amplifier
PRECISION CURRENT PUMP
Maximum output current of the precision current pump shown
in Figure 7 is
±
10 mA. Voltage compliance is
±
10 V with
±
15 V
supplies. Output impedance of the current transmitter exceeds
3 M
with linearity better than 16 bits.
2
3
1
7
8
5
6
4
–
15V
+15V
I
OUT
–
+
VIN
I
OUT
= V
100
IN
V
IN
R1
10k
R2
10k
R4
10k
R3
10k
R5
10k
OP497
1/4
OP497
Figure 7. Precision Current Pump
PRECISION POSITIVE PEAK DETECTOR
In Figure 8, the CH must be of polystyrene, Teflon
*
, or polyeth-
ylene to minimize dielectric absorption and leakage. The droop
rate is determined by the size of CH and the bias current of the
OP497.
2
3
1
7
8
5
6
4
–
15V
+15V
1N4148
2N930
C
H
RESET
V
IN
V
OUT
1k
1k
1k
1k
0.1 F
0.1 F
1/4
OP497
1/4
OP497
Figure 8. Precision Positive Peak Detector
SIMPLE BRIDGE CONDITIONING AMPLIFIER
Figure 9 shows a simple bridge conditioning amplifier using
the OP497. The transfer function is:
V
V
R
R
R
R
R
OUT
REF
F
=
+
The REF43 provides an accurate and stable reference voltage
for the bridge. To maintain the highest circuit accuracy, R
F
should be 0.1% or better with a low temperature coefficient.
*
Teflon is a registered trademark of the Dupont Company.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OP-497 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION PICOAMPERE INPUT CURRENT QUAD OPERATIONAL AMPLIFIER |
| OP4970027SR | 制造商:Analog Devices 功能描述: |
| OP497AY | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Picoampere Input Current Quad Operational Amplifier |
| OP-497AY | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION PICOAMPERE INPUT CURRENT QUAD OPERATIONAL AMPLIFIER |
| OP-497BRC/883 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION PICOAMPERE INPUT CURRENT QUAD OPERATIONAL AMPLIFIER |
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