ADA4522-4ARUZ-R7 datasheet(32/48 Pages) AD

32 / 48 page

Data Sheet

ADA4522-1/ADA4522-

2/ADA4522-4

analog.com

Rev I 32 of 48

Figure 74.Large Signal Transient Response Example

Figure 75.Circuit Diagram for Large Signal Transient Response

Case 2

If the external source resistance is high or if the input step function is small, the maximum output current is limited

to the instantaneous difference between the input signal and amplifier output voltage (which is the change in the

step function) divided by the source resistance. This maximum output current is less than the amplifier output

short-circuit current. The maximum differential voltage between the input signal and the amplifier output is then

equal to the step function. The output voltage slews until it reaches its desired output.

Therefore, if desired, reduce the input current by adding a larger external resistor between the signal source and

the noninverting input. Similarly, to reduce output current, add an external resistor to the feedback loop between

the inverting input and output. This large signal transient response issue is typically not a problem when the

amplifier is configured in closed-loop gain, where the input signal source is usually much smaller and the gain and

feedback resistors limit the current.

Back to back diodes are also implemented in many other amplifiers; these amplifiers show similar slewing

behavior.

Noise Considerations

1/f Noise

1/f noise, also known as pink noise or flicker noise, is inherent in semiconductor devices and increases as frequency

decreases. At a low frequency, 1/f noise is a major noise contributor and causes a significant output voltage offset

when amplified by the noise gain of the circuit. However, because the low frequency 1/f noise appears as a slow

varying offset to the ADA4522-1/ADA4522-2/ADA4522-4, it is effectively reduced by the chopping technique. This

technique allows the ADA4522-1/ADA4522-2/ADA4522-4 to have a much lower noise at dc and low frequency in

–30

–20

–10

TIME (10µs/DIV)

VSY = ±27.5V

RS_IN–

100Ω

RS_IN+

100Ω

VSY+

VSY–

ADA4522-1/

ADA4522-2/

ADA4522-4

100pF

10kΩ

VOUT

VIN = 50V p-p

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