ADA4096-2ACPZ-R7 datasheet(16/20 Pages) AD

16 / 20 page

ADA4096-2

Data Sheet

Rev. A | Page 16 of 20

INPUT OVERVOLTAGE PROTECTION

The ADA4096-2 inputs are protected from input voltage

excursions up to 32 V outside each rail. This feature is of

particular importance in applications with power supply

sequencing issues that could cause the signal source to be active

before the supplies to the amplifier.

Figure 47 shows the input current limiting capability of the

ADA4096-2 (green curves) compared to using a 5 kΩ series

resistor (red curves).

–48 –40 –32 –24 –16

–8

–7

–6

–5

–4

–3

–2

–1

VIN (V)

LOW RDSON SERIES FET

5kΩ SERIES RESISTOR

Figure 47. Input Current Limiting Capability

Figure 47 was generated with the ADA4096-2 in a buffer configu-

ration with the supplies connected to GND (or ±15 V) and the

positive input swept until it exceeds the supplies by 32 V. In general,

input current is limited to 1 mA during positive overvoltage con-

ditions and 200 μA during negative undervoltage conditions. For

example, at an overvoltage of 20 V, the ADA4096-2 input current is

limited to 1 mA, providing a current limit equivalent to a series

20 kΩ resistor. Figure 47 also shows that the current limiting

circuitry is active whether the amplifier is powered or not.

Note that Figure 47 represents input protection under abnormal

conditions only. The correct amplifier operation input voltage

range (IVR) is specified in Table 2 to Table 4.

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