+

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ESD Cell

VIN-

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11

OPA2863

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SBOS982A – JUNE 2020 – REVISED JUNE 2020

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Copyright © 2020, Texas Instruments Incorporated

Feature Description (continued)

8.3.3 ESD Protection

As Figure 7 shows, all device pins are protected with internal ESD protection diodes to the power supplies.

These diodes provide moderate protection to input overdrive voltages above the supplies. The protection diodes

can typically support 10-mA continuous input and output currents. Use series current limiting resistors if input

voltages exceeding the supply voltages occur at the amplifier inputs, which ensures the current through the ESD

diodes remains within their rated value. Keep these resistor values as low as possible because using high values

degrades noise performance and frequency response.

Since OPAx863 is a bipolar amplifier, the two inputs are protected with anti-parallel back-to-back diodes between

them which limits the maximum input differential voltage to approximately 1 V. In very fast input or output

transient conditions, the amplifier is slew limited and the two inputs are pulled apart up to 1 V, when the anti-

parallel diodes begin to conduct. Care must be taken to use gain-setting and feedback resistors large enough to

limit the current through these diodes in such conditions.

Figure 7. Internal ESD Protection

8.4 Device Functional Modes

8.4.1 Power-Down Mode

The OPAx863 devices include a power-down mode for low-power standby operation with a quiescent current of

only 1.5 μA (maximum). Many applications, such as battery powered systems, are active for only a small time

interval when the parameters of interest are measured and remain in low-power standby mode for a majority of

the time. This results in an overall small average power consumption. The OPAx863 device enable such a low-

power operation with quick turn-on that the device turns on within less than 10 μsec. The device remains in

8.4.2 Split-Supply Operation (±1.35 V to ±6.3 V)

See the OPA2863DGK Evaluation Module user guide for more information on how the OPAx863 devices can be

configured to allow for split-supply operation to facilitate testing with common lab equipment. This configuration

eases lab testing because the mid-point between the power rails is ground, and most signal generators, network

analyzers, oscilloscopes, spectrum analyzers, and other lab equipment reference the inputs and outputs to

ground. Figure 8 depicts the OPAx863 devices configured as a noninverting amplifier and Figure 9 illustrates the

OPAx863 devices configured as an inverting amplifier. For split-supply operation referenced to ground, the power

systems where the signals swing around ground because of the ease-of-use; however, the system requires two

supply rails.