Auxiliary

NPN-

Stage

VS+

EN

Main

PNP-

Stage

VS±

EN

VIN+

VIN±

VOUT

+

+

+

OPAx863

±

±

±

±

Output

Sho rt-Circuit

Pro tection

Overloa d

Power

Limiting

PD

9

OPA2863

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SBOS982A – JUNE 2020 – REVISED JUNE 2020

Product Folder Links: OPA2863

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8 Detailed Description

8.1 Overview

The OPAx863 devices are low-power, 50 MHz, rail-to-rail input and output (RRIO) bipolar voltage-feedback

operational amplifiers with a voltage noise density of 5.9 nV/

√Hz and 1/f noise corner at 30 Hz. The OPAx863

devices work in a wide-supply voltage range from 2.7 V to 12.6 V and consumes only 750 µA quiescent current.

The OPAx863 devices operate with 2.7-V supply, are RRIO capable, consume low-power and offer a power-

down mode, which makes them ideal amplifiers for 3.3-V or lower voltage applications that need superior AC

performance. The amplifier's two input stages are well-matched for gain bandwidth product (GBW), noise and

offset voltage especially for applications which require wide dynamic input range and good SNR.

The device includes an overload power limit feature which limits the increase in quiescent current with over-

driven and saturated outputs to either of the supply rails. See Overload Power Limit for more details of this

overload power limit feature. The amplifier's output is protected against short-circuit fault conditions.

The OPAx863 devices feature a power-down (PD) mode with a PD quiescent current of 1.5-µA (maximum) with

turn-on and turn-off within less than 10-µs.

8.2 Functional Block Diagram