OPA2863 datasheet(24/49 Pages) TI

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8.3.3 ESD Protection

As Figure 8-1 shows, all device pins are protected with internal ESD protection diodes to the power supplies.

These diodes provide moderate protection to input overdrive voltages 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. 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. Care must be taken 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-

Figure 8-1. Internal ESD Protection

8.4 Device Functional Modes

8.4.1 Power-Down Mode

The OPAx863 includes a power-down mode for low-power standby operation with a quiescent current of only

1.5 μA (maximum) with a 3-V supply 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 and an overall small average power consumption. The OPAx863 enables such a low-power

operation with quick turn-on within less than 6.5 μs. Refer to the Electrical Characteristics tables for power-down

pin control thresholds.

The PD pin always needs to be driven to avoid false triggering and oscillations. If it is not necessary to use the

power-down mode, then the PD pin should be connected to VS+. For applications which need the power-down

mode, an external pull-up resistor from the PD pin to VS+ (driven with an open-collector power-down control

logic) may be used.

OPAx863

RPU

VS+

VS–

CPU

Control

Logic

1 M

1 nF

Figure 8-2. Power Down Control

Figure 8-2 shows the choice of value of the pull-up resistor RPU, which impacts the current consumption in

power-down mode. Using a large RPU reduces the power consumption, but increases the noise at the PD pin

which could cause the amplifier to power-down. A 1 nF capacitor may be used in parallel with RPU to avoid

coupling of external noise and false triggering. For the case of PD pin driven to VS-, the current IPU through RPU

is given as,

−

(1)

OPA863, OPA2863, OPA4863

SBOS982H – JUNE 2020 – REVISED AUGUST 2022

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