OPA838 Datasheet, PDF (1/41 Pages) Texas Instruments – 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedback Op Amp

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OPA838
SBOS867 – AUGUST 2017
OPA838 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedback Op Amp
1 Features
•1 Gain Bandwidth Product: 300 MHz
• Very-Low (Trimmed) Supply Current: 950 µA
• Bandwidth: 90 MHz (A_V = 6 V/V)
• High Full-Power Bandwidth: 45 MHz, 4 V_PP
• 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)
SOT-23 (6)
2.90 mm × 1.60 mm
OPA838
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
1 pF
Large Area Photodetector
With 100-pF Capacitance
Diode
Current
Direction
-VBIAS
100 k
VCC = 3 V
±
73.2
+
VOUT
2.2 nF
1-MHz
Post Filter
Copyright © 2017, Texas Instruments Incorporated
1
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.