OPA863 datasheet(21/52 Pages) TI

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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 25 Hz. The OPAx863

work with a wide-supply voltage range of 2.7 V to 12.6 V, and consume only 700 μA quiescent current. The

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

which makes them great amplifiers for 3.3

‑V or lower-voltage applications that require excellent ac performance.

The main and auxiliary input stages of the amplifier are matched for gain bandwidth product (GBW), noise, and

offset voltage and designed for applications that 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. For more details of this overload power limit feature,

see Section 8.3.2.1. The amplifier's output is protected against short-circuit fault conditions.

The OPAx863 feature a power-down mode (PD) with a PD quiescent current of 1.5 µA (maximum) with a 3

‑V

supply, with turn-on and turn-off time within less than 6.5 µs.

8.2 Functional Block Diagram

Auxiliary

NPN-

Stage

VS+

Main

PNP-

Stage

VS–

VS+ –1.6 V

VIN+

VIN–

VOUT

OPAx863

–

Output

Short-Circuit

Protection

Overload

Power

Limiting

www.ti.com

OPA863, OPA2863, OPA4863

SBOS982J – JUNE 2020 – REVISED JUNE 2023

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