7.3.3 ESD Protection

As Figure 7-1 shows, all device pins are protected with internal ESD protection diodes to the power supplies.

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

diodes 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 makes sure that the current through

the ESD diodes remains within the rated value. OPAx863A is a bipolar amplifier; therefore, the two inputs are

protected with antiparallel, back-to-back diodes between the inputs that limits the maximum input differential

voltage to approximately 1 V. Make sure to use gain-setting and feedback resistors large enough to limit the

current through these diodes in fast slewing conditions.

+

VS+

VS-

VIN+

VOUT

Power Sup ply

ESD Cell

VIN-

±

PD

Figure 7-1. Internal ESD Protection

7.4 Device Functional Modes

7.4.1 Power-Down Mode

The OPAx863A includes a power-down mode for low-power standby operation with a quiescent current of 8.5 μA

(typical) and high output impedance. Many low-power 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, for an

overall small average power consumption. The OPAx863A enables such low-power operation with quick turn-on

within less than 8 μs. See the Electrical Characteristics tables for power-down pin control thresholds.

The OPAx863A is enabled with the PD pin driven to VS+ – 0.5 V or greater. The device powers down if the PD

pin is driven to VS+ – 1.5 V or less with a driver device capable of sinking approximately 1 μA (typical) current

from the PD pin. If level translation is needed to realize the PD pin thresholds for enable or power-down modes

of operation, use an external pullup resistor from PD pin to VS+ driven with an open-collector output.

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OPA863A, OPA2863A

SBOSA95D – MAY 2022 – REVISED DECEMBER 2023

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