Large Area Photodetector

With 100-pF Capacitance

+

±

Diode

Current

Direction

1 pF

73.2

2.2 nF

1-MHz

Post Filter

100 k

Copyright © 2017, Texas Instruments Incorporated

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

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. PRODUCTION DATA.

OPA838

SBOS867 – AUGUST 2017

OPA838 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedback Op Amp

1

1 Features

1

•

Gain Bandwidth Product: 300 MHz

•

Very-Low (Trimmed) Supply Current: 950 µA

•

•

•

Negative Rail Input, Rail-to-Rail Output

•

Single-Supply Operating Range: 2.7 V to 5.4 V

•

25°C Input Offset: ±125 µV (Maximum)

•

Input Offset Voltage Drift: < ±1.6 µV/°C

(Maximum)

•

Input Voltage Noise: 1.8 nV/

√Hz (> 200 Hz)

•

Input Current Noise: 1 pA/

√Hz (> 2000 Hz)

•

< 5-µA Shutdown Current for Power Savings

2 Applications

•

Low-Power Transimpedance Amplifiers

•

Low-Noise High-Gain Stages

•

12-Bit to 16-Bit Low-Power SAR ADC Drivers

•

High-Gain Active Filter Designs

•

Ultrasonic Flow Meters

3 Description

The

OPA838

decompensated

voltage

feedback

operational amplifier provides a high 300-MHz gain

bandwidth

product

with

1.8-nV/

√Hz

input

noise

voltage, requiring only a trimmed 0.95-mA supply

current. These features combine to provide an

extremely power-efficient solution for photodiode

transimpedance

designs

and

high-voltage

gain

stages, which require the lowest input voltage noise

in signal receiver applications.

Operating

at

the

minimum

recommended

noninverting gain of 6 V/V results in a 90-MHz, –3-dB

bandwidth. Extremely low input noise and offset

voltage make the OPA838 particularly suitable for

high gains. Even at a DC-coupled gain of 1000 V/V, a

300-kHz

signal

bandwidth

is

available

with

a

maximum output offset voltage of ±125 mV.

The single-channel OPA838 is available in a 6-pin

SOT-23 package, 6-pin SC70 package (that includes

a power shutdown feature) and 5-pin SC70 package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

OPA838

SOT-23 (6)

2.90 mm × 1.60 mm

SC70 (5)

2.00 mm × 1.25 mm

SC70 (6)

2.00 mm × 1.25 mm

(1) For all available packages, see the package option addendum

at the end of the data sheet.

SPACE

SPACE

Single 3-V Supply, < 3-mW Photodiode Amplifier With < 1.1-pA/

√Hz Total Input-Referred Current Noise

and 100-kΩ Gain With Overall 1-MHz SSBW