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| 型号： | AD8698 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | 双精密，轨至轨输出运算放大器 |
| 文件页数： | 15/20页 |
| 文件大小： | 317K |
| 代理商： | AD8698 |
AD8698
Rev. 0 | Page 15 of 20
U
1k
10k
100k
1M
10M
LOAD CAPACITANCE (nF)
1
10
100
0
Figure 52. Unity Gain Bandwidth vs. Load Capacitance
Figure 52 shows the unity gain bandwidth as a function of load
capacitance.
INSTRUMENTATION AMPLIFIER
Instrumentation amplifiers are used in applications requiring
precision, accuracy, and high CMRR. One popular application
is signal conditioning in process control, test automation, and
measurement instrumentation, where the amplifier is used to
amplify small signals.
The triple op amp implementation uses the AD8698 at the
front end with the OP184 for optimum accuracy.
The circuit in Figure 53
enjoys a high overall gain, excellent dc
performance, high CMRR, as well as the benefit of an output
that swings to the supplies.
The CMRR of the in-amp will be limited by the choice of
resistor tolerance. R5 is an optional potentiometer that can be
used to calibrate the circuit for maximum gain. R7 can be
trimmed for optimum CMRR.
The output voltage is given by:
1
=
1
R
2
R
4
R
3
R
V
V
IN
O
2
V–
V+
V+
R3
9k
R1
1k
R2
10k
R1
9.8k
R7
400
R4
2k
R5
10k
R3
9k
V–
V2
V1
0
V–
V+
OP184
1/2 AD8698
1/2 AD8698
Figure 53. Three Op Amp In-Amp
COMPOSITE AMPLIFIER
The dc accuracy of the AD8698 and the ac performance of the
OP184 are combined in the circuit shown in Figure 54. The
composite amplifier provides a higher bandwidth, a lower offset
voltage, and a higher loop, thereby reducing the gain error
substantially.
The circuit shown exhibits a total output rms noise of less than
500 μV, corresponding to less than 3 mV of peak-to-peak noise
over approximately a 3 MHz bandwidth. Cf is used to minimize
peaking.
The circuit has an inverting gain of 10. In applications with
higher closed-loop gains, Cf is necessary to maintain a
sufficient phase margin and ensure stability. This results in a
narrower closed-loop bandwidth.
V+
OP184
1/2 AD8698
V–
V+
V–
0
R2
10k
R1
1k
Cf
20pF
V
IN
Figure 54. Composite Amplifier Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| AD8698AR | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| AD8698AR-REEL | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| AD8698AR-REEL7 | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| AD8698ARM-R2 | Dual Precision, Rail-to-Rail Output Operational Amplifier |
| AD8698ARM-REEL | Dual Precision, Rail-to-Rail Output Operational Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8698AR | 制造商:Analog Devices 功能描述:OP AMP DUAL PRECISION RRO/P 8698 |
| AD8698ARM | 制造商:Analog Devices 功能描述:OP AMP DUAL GP R-R O/P 15V 8MSOP - Bulk |
| AD8698ARM-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P ±15V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:DUAL PRECISION RAIL-RAIL OP AMP - Bulk |
| AD8698ARM-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P ±15V 8-Pin MSOP T/R |
| AD8698ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P ±15V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:OP AMP DUAL PRECISION RRO/P 8698 |
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