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AD8609ARUZ

AD8609ARUZ首页预览图
型号: AD8609ARUZ
PDF文件:
  • AD8609ARUZ PDF文件
  • AD8609ARUZ PDF在线浏览
功能描述: Precision Micropower, Low Noise CMOS Rail-to-Rail Input/Output Operational Amplifiers
PDF文件大小: 457.3 Kbytes
PDF页数: 共20页
制造商: AD[Analog Devices]
制造商LOGO: AD[Analog Devices] LOGO
制造商网址: http://www.analog.com
捡单宝AD8609ARUZ
PDF页面索引
120%
AD8603/AD8607/AD8609
Rev. B | Page 12 of 20
APPLICATIONS
NO PHASE REVERSAL
The AD8603/AD8607/AD8609 do not exhibit phase inversion
even when the input voltage exceeds the maximum input
common-mode voltage. Phase reversal can cause permanent
damage to the amplifier, resulting in system lockups. The
AD8603/AD8607/AD8609 can handle voltages of up to 1 V
over the supply.
VOLTAGE (1V/DIV)
TIME (4μs/DIV)
V
S
= ±2.5V
V
IN
= 6V p-p
A
V
= 1
R
L
= 10kΩ
V
IN
V
OUT
04356-041
Figure 41. No Phase Response
INPUT OVERVOLTAGE PROTECTION
If a voltage 1 V higher than the supplies is applied at either
input, the use of a limiting series resistor is recommended. If
both inputs are used, each one should be protected with a
series resistor.
To ensure good protection, the current should be limited to a
maximum of 5 mA. The value of the limiting resistor can be
determined from the equation
(V
IN
V
S
)/(R
S
+ 200 Ω) 5 mA
DRIVING CAPACITIVE LOADS
The AD8603/AD8607/AD8609 are capable of driving large
capacitive loads without oscillating.
Figure 42 shows the output
of the AD8603/AD8607/AD8609 in response to a 100 mV input
signal, with a 2 nF capacitive load.
Although it is configured in positive unity gain (the worst case),
the AD8603 shows less than 20% overshoot. Simple additional
circuitry can eliminate ringing and overshoot.
One technique is the snubber network, which consists of a
series RC and a resistive load (see
Figure 43). With the snubber
in place, the AD8603/AD8607/AD8609 are capable of driving
capacitive loads of 2 nF with no ringing and less than 3%
overshoot.
The use of the snubber circuit is usually recommended for unity
gain configurations. Higher gain configurations help improve
the stability of the circuit.
Figure 44 shows the same output
response with the snubber in place.
V
S
= ±0.9V
V
IN
= 100mV
C
L
= 2nF
R
L
= 10kΩ
04356-042
Figure 42. Output Response to a 2 nF Capacitive Load, Without Snubber
04356-043
C
S
47pF
V
CC
V
EE
R
S
150Ω
200mV
C
L
V+
V–
+
Figure 43. Snubber Network
V
SY
= ±0.9V
V
IN
= 100mV
C
L
= 2nF
R
L
= 10kΩ
R
S
= 150Ω
C
S
= 470pF
04356-044
Figure 44. Output Response to a 2 nF Capacitive Load, With Snubber
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