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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： | 14/20页 |
| 文件大小： | 317K |
| 代理商： | AD8698 |
AD8698
APPLICATIONS
INPUT OVERVOLTAGE PROTECTION
The AD8698 has internal protective circuitry which allows
voltages at either input to exceed the supply voltage. However,
if voltages applied at either input exceed the supply voltage by
more than 2 V, it is recommended to use a resistor in series
with the inputs to limit the input current and prevent damaging
the device.
Rev. 0 | Page 14 of 20
The value of the resistor can be calculated from the following
formula:
S
IN
R
mA
5
500
≤
+
S
V
V
DRIVING CAPACITIVE LOADS
The AD8698 is stable even when driving heavy capacitive
loads in any configuration. Although the AD8698 will safely
drive capacitive loads well over 10 nF, it is recommended to
use external compensation should the amplifier be subjected
to driving a load exceeding 50 nF. This is particularly
important in positive unity gain configurations, the worst
case for stability.
Figure
49 shows the output of the AD8698
with a 68 nF load in response to a 400 mV signal at its
positive input; the overshoot is less than 25% without any
external compensation. Using a simple “snubber” network
reduces the overshoot to less than 10% as shown in
Figure
50.
V
V
S
= ±15V
C
L
= 68nF
A
V
= 1
TIME (10
μ
s/DIV)
0
Figure 49. Heavy Capacitive Load Drive without Compensation
V
V
S
= ±15V
C
L
= 68nF
R
S
= 30
C
S
= 5nF
A
V
= 1
TIME (10
μ
s/DIV)
0
Figure 50. Compensated Capacitive Load Drive with Snubber
The snubber network consists of a simple RC network
whose values are determined empirically.
V+
R
S
C
S
C
L
V–
400mV
+
–
0
Figure 51. Snubber Network
Table 5
provides a few starting values for optimum
compensation.
Table 5. Compensation Values
C
L
(nF)
R
S
(
)
47
20
68
30
100
50
C
S
(nF)
7
5
3
The use of the snubber network does not recover the loss of
bandwidth incurred by the load capacitance. The AD8698
maintains a unity gain bandwidth of 1 MHz with load
capacitances of up to 1 nF.
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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