OPA2188 datasheet(22/43 Pages) TI

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Op Amp

Core

(1)

OUT

+IN

ESD Current-

Steering Diodes

V+

(3)

TVS

(2)

Edge-Triggered ESD

Absorption Circuit

V±

TVS

(2)

(1) VIN = V+ + 500 mV.

(2) TVS: 40 V > VTVSBR (min) > V+, where VTVSBR (min) is the minimum specified value for the transient voltage suppressor breakdown

voltage.

(3) Suggested value is approximately 5 kΩ in overvoltage conditions.

Figure 8-3. Equivalent Internal ESD Circuitry Relative to a Typical Circuit Application

8.3.5 MUX-Friendly Inputs

The OPAx182 feature a proprietary input stage design that allows an input differential voltage to be applied

while maintaining high input impedance. Typically, high-voltage CMOS or bipolar-junction input amplifiers feature

antiparallel diodes that protect input transistors from large VGS voltages that may exceed the semiconductor

process maximum and permanently damage the device. Large VGS voltages can be forced when applying a

large input step, switching between channels, or attempting to use the amplifier as a comparator. For more

information, see the MUX-Friendly Precision Operational Amplifiers application brief.

The OPAx182 solve these problems with a switched-input technique that prevents large input bias currents

when large differential voltages are applied. This input architecture solves many issues seen in switched or

multiplexed applications, where large disruptions to RC filtering networks are caused by fast switching between

large potentials. The OPAx182 offer outstanding settling performance because of these design innovations,

along with built-in slew rate boost and wide bandwidth. The OPAx182 can also be used as a comparator.

Differential and common-mode Absolute Maximum Ratings still apply relative to the power supplies.

8.4 Device Functional Modes

The OPAx182 have a single functional mode, and are operational when the power-supply voltage is greater than

4.5 V (±2.25 V). The maximum power supply voltage is 36 V (±18 V).

OPA182, OPA2182, OPA4182

SBOS936D – DECEMBER 2019 – REVISED DECEMBER 2021

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