1 Features

• Gain bandwidth product: 300MHz

• Very-low (trimmed) supply current: 950μA

• Bandwidth: 90MHz (AV = 6V/V)

• High full-power bandwidth: 45MHz, 4VPP

• Negative rail input, rail-to-rail output

• Single-supply operating range: 2.7V to 5.4V

• 25°C input offset: ±125μV (maximum)

• Input offset voltage drift: < ±1.6μV/°C (maximum)

• Input voltage noise: 1.8nV/√Hz (> 200Hz)

• Input current noise: 1pA/√Hz (> 2000Hz)

• < 1μA shutdown current for power savings

2 Applications

• Low-power transimpedance amplifier

• Low-noise high-gain stage

• 12-bit to 16-bit low-power SAR ADC driver

• High-gain active filter design

• Ultrasonic flow meter

3 Description

The OPA838 decompensated voltage-feedback

operational amplifier provides a high, 300MHz

gain bandwidth product with 1.8nV/√Hz input noise

voltage, requiring only a trimmed 0.95mA supply

current. These features combine to provide an

extremely power-efficient device 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 6V/V results in a 90MHz, –3dB bandwidth.

Extremely low input noise and offset voltage make

the OPA838 an excellent choice for high gains. Even

at a dc-coupled gain of 1000V/V, a 300kHz signal

bandwidth is available with a maximum output offset

voltage of ±125mV.

The single-channel OPA838 is available in 6-pin

SOT-23, 6-pin SC70, and 8-pin X2QFN packages, all

with a power shutdown feature. The OPA838 is also

available in a 5-pin SC70 package.