ADA4522-4ARZ-R7 datasheet(26/32 Pages) AD

Part #	ADA4522-4ARZ-R7

Description	55 V, EMI Enhanced, Zero Drift, Ultralow Noise, Rail-to-Rail Output Operational Amplifiers

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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26 / 32 page

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

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.

100

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

ADA4522-4ARZ-R7 Datasheet(PDF) 26 Page - Analog Devices