+

±

OPA x863

GND

To

ADC

V

LED

Driver

LED

Photo-

Diode

+

±

+

±

GND

To MCU/

ADC

To compar ato r

for faul t detection

Switchi ng

Circuit

GND

OPA x863

Transimpedance Amplifier Circuit

Low-side Current Sensing

4.1 mA

2.2 mA

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

OPA2863

SBOS982A – JUNE 2020 – REVISED JUNE 2020

OPAx863 Low-Power, 100-MHz, Rail-to-Rail Input and Output, Voltage-Feedback Amplifier

1

1 Features

1

•

Wide-Bandwidth

–

–

Gain-Bandwidth Product: 50-MHz

•

Low Power

–

Quiescent Current: 720-µA/ch (Typical)

–

Power Down Mode: 1.5-µA (Maximum)

–

Supply Voltage: 2.7-V to 12.6-V

•

Input Voltage Noise: 5.9-nV/

√Hz

•

Slew Rate: 100-V/µs

•

Rail-to-Rail Input and Output

•

•

Operating Temperature Range:

–40°C to +125°C

•

Additional Features:

–

Overload Power Limit

–

Output Short-Circuit Protection

2 Applications

•

Low-Power SAR and ΔΣ ADC Driver

•

ADC Reference Buffer

•

Low-Side Current Sensing

•

Photodiode TIA Interface

•

Inductive Sensing

•

Ultrasonic Flow Meters

•

Multi-Function Printers

•

MDAC Output Buffer

•

Gain & Active Filter Stages

3 Description

The OPAx863 devices are low-power, unity-gain

stable,

rail-to-rail

input/output,

voltage-feedback

operational amplifiers designed to operate over a

power supply range of 2.7-V to 12.6-V. Consuming

only 750-µA per channel, the OPAx863 devices offer

a gain-bandwidth product of 50-MHz, slew rate of

100-V/µs with a voltage noise density of 5.9-nV/

√Hz.

The rail-to-rail input stage with 2.7-V supply operation

is useful in portable battery powered applications.

The differential input stages are well matched for

gain-bandwidth product and noise across the full

input common-mode voltage range, enabling superior

performance with wide-input dynamic range. The

OPAx863 devices feature a power-down (PD) mode

with a PD quiescent current of 1.5-µA (maximum)

with turn-on or turn-off within 10-µs (typical).

The

OPAx863

devices

include

overload

power

limiting to limit the increase in quiescent current with

saturated

outputs,

thereby

preventing

excessive

dissipation critical in battery-powered systems. The

output stage is short-circuit protected, making it a

rugged amplifier for general-purpose usage.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

OPA863

2.90 mm × 1.60 mm

OPA2863

VSSOP (8)

3.00 mm × 3.00 mm

3.00 mm × 3.00 mm

OPA4863

5.00 mm × 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

(2) Preview packages

Application Circuits Using OPAx863

Increase in Quiescent Current

with Output Saturation