OPA863 datasheet(23/52 Pages) TI

23 / 52 page

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 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. OPAx863 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-

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. See the Electrical Characteristics tables for power-down pin

control thresholds.

Always drive PD pin to avoid false triggering and oscillations. If power-down mode is not used, then connect the

PD pin to VS+. For applications that need power-down mode, use an external pull-up resistor from the PD pin to

VS+ (driven with an open-collector power-down control logic).

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 power consumption, but increases the noise at the PD pin, which

can cause the amplifier to power down. A 1

‑nF capacitor can be used in parallel with RPU to avoid coupling of

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

as:

−

(1)

www.ti.com

OPA863, OPA2863, OPA4863

SBOS982J – JUNE 2020 – REVISED JUNE 2023

Submit Document Feedback

Product Folder Links: OPA863 OPA2863 OPA4863

OPA863 Datasheet(PDF) 23 Page - Texas Instruments

OPA863 Datasheet(HTML) 23 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL