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OP97FP Datasheet(PDF) 9 Page - Analog Devices

Part # OP97FP
Description  Low-Power, High-Precision Operational Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

OP97FP Datasheet(HTML) 9 Page - Analog Devices

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REV. D
OP97
–9–
The digitally programmable gain amplifier shown in Figure 10
has 12-bit gain resolution with 10-bit gain linearity over the
range of –1 to –1024. The low bias current of the OP97 main-
tains this linearity, while C1 limits the noise voltage bandwidth
allowing accurate measurement down to microvolt levels.
DIGITAL IN
GAIN (Av)
4095
–1.00024
2048
–2
1024
–4
512
–8
256
–16
128
–32
64
–64
32
–128
16
–256
8
–512
4
–1024
2
–2048
1
–4096
0
OPEN LOOP
Many high-speed amplifiers suffer from less-than-perfect low-
frequency performance. A combination amplifier consisting of a
high precision, slow device like the OP97 and a faster device
such as the OP44 results in uniformly accurate performance
from dc to the high frequency limit of the OP44, which has a
gain-bandwidth product of 23 MHz. The circuit shown in Figure 11
accomplishes this, with the OP44 providing high frequency
amplification and the OP97 operating on low frequency signals
and providing offset correction. Offset voltage and drift of the
circuit are controlled by the OP97.
VOUT
OP97
2
3
6
0.1 F
+15V
C1
220pF
17
16
PM7541
VREF
RFB
1
2
3
18
2.5mV TO
10V
RANGE DEPENDING
ON GAIN SETTING
VIN
–15V
0.1 F
+15V
IOUT 1
IOUT 2
0.1 F
Figure 10. Precision Programmable Gain Amplifier
OP44
VOUT
2
3
6
OP97
2
3
6
R2
20k
5
10k
1 F
R1
2k
VIN
0.1 F
10k
5pF
R2
R1
AV =
Figure 11. Combination High-Speed, Precision Amplifier
Figure 12. Combination Amplifier Transient Response
.


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