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参数资料
| 型号： | 5962-9452101M2A |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运算放大器 |
| 英文描述： | QUAD OP-AMP, 75 uV OFFSET-MAX, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 11/12页 |
| 文件大小： | 297K |
| 代理商： | 5962-9452101M2A |
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
DIFFERENTIAL
INPUT
VOLTAGE
–
10
V/
DIV
RL = 10k
VS =
15V
VCM = 0V
TA = +25C
TA = –55 C
TA = +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
TCVOS 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
VIN
–15V
4
C3
0.1 F
8
1
6
5
7
0V < V
< 10V
OUT
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
IOUT
10mA
–
+
VIN
IOUT =
=
= 10mA/ V
VIN
R5
VIN
100
R1
10k
R2
10k
R4
10k
R3
10k
R5
10k
1/4
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
CH
RESET
VIN
VOUT
1k
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:
VV
R
RR
R
OUT
REF
F
=
+
The REF43 provides an accurate and stable reference voltage
for the bridge. To maintain the highest circuit accuracy, RF
should be 0.1% or better with a low temperature coefficient.
*Teflon is a registered trademark of the Dupont Company.
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