OP97 Просмотр технического описания (PDF) - Analog Devices
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OP97 Datasheet PDF : 16 Pages
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OP97
The digitally programmable gain amplifier shown in Figure 38
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.
Table 5.
DIGITAL IN
4095
2048
1024
512
256
128
64
32
16
8
4
2
1
0
GAIN (Av)
−1.00024
−2
−4
−8
−16
−32
−64
−128
−256
−512
−1024
−2048
−4096
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 AD8610 results in uniformly accurate performance from
dc to the high frequency limit of the AD8610, which has a gain-
bandwidth product of 25 MHz. The circuit shown in Figure 39
accomplishes this, with the AD8610 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.
+15V
VIN
±2.5mV TO ±10V
18
RANGE DEPENDING
ON GAIN SETTING
RFB
1 IOUT1
16
0.1µF
VREF 17
2
3 IOUT2 AD7541A
C1
220pF
+15V
2
OP97 6
3
0.1µF
VOUT
0.1µF
–15V
Figure 38. Precision Programmable Gain Amplifier
R2
20kΩ
5pF
R1
2kΩ
1µF
VIN
10kΩ
10kΩ
2
2
AD8610 6
3
6
OP97
3
5
AV
=
–
R2
R1
0.1µF
0.1µF
VOUT
Figure 39. Combination High Speed, Precision Amplifier
5V
100
90
10
0%
1V
2µs
Figure 40. Combination Amplifier Transient Response
Rev. F | Page 14 of 16
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