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ADA4522-2ARZ-R7 Folha de dados(PDF) 26 Page - Analog Devices

Nome de Peças ADA4522-2ARZ-R7
Descrição Electrónicos  55 V, EMI Enhanced, Zero Drift, Ultralow Noise, Rail-to-Rail Output Operational Amplifiers
PDF  32 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADA4522-2ARZ-R7 Folha de dados(HTML) 26 Page - Analog Devices

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ADA4522-1/ADA4522-2/ADA4522-4
Data Sheet
Rev. E | Page 26 of 32
A quick and easy way to stabilize the op amp for capacitive load
drive is by adding a series resistor, RISO, between the amplifier
output terminal and the load capacitance, as shown in Figure 80.
RISO isolates the amplifier output and feedback network from
the capacitive load. However, with this compensation scheme,
the output impedance as seen by the load increases, and this
reduces gain accuracy.
–VSY
VIN
+VSY
VOUT
CL
ADA4522-1/
ADA4522-2/
ADA4522-4
RISO
Figure 80. Stability Compensation with Isolating Resistor, RISO
Figure 81 shows the effect on overshoot with different values of
RISO.
60
25
50
55
45
20
40
15
35
10
30
5
0
10
100
1k
LOAD CAPACITANCE (pF)
VSY = ±15V
RL = 10kΩ
AV = 1
VIN = 100mV p-p
OS+ (RISO = 0Ω)
OS– (RISO = 0Ω)
OS+ (RISO = 25Ω)
OS– (RISO = 25Ω)
OS+ (RISO = 50Ω)
OS– (RISO = 50Ω)
Figure 81. Small Signal Overshoot vs. Load Capacitance with Various Output
Isolating Resistors



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