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OPA381

Burr-Brown
Part Number OPA381
Manufacturer Burr-Brown
Description Precision / Low Power / 18MHz Transimpedance Amplifier
Published May 13, 2005
Detailed Description OPA381 OPA2381 SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004 Precision, Low Power, 18MHz Transimpedance Amplifier FEAT...
Datasheet PDF File OPA381 PDF File

OPA381
OPA381

Overview
OPA381 OPA2381 SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004 Precision, Low Power, 18MHz Transimpedance Amplifier FEATURES D OVER 250kHz TRANSIMPEDANCE D D D D D D D D D D D D D D D D D BANDWIDTH DYNAMIC RANGE: 5 Decades EXCELLENT LONG-TERM STABILITY LOW VOLTAGE NOISE: 10nV/√Hz BIAS CURRENT: 3pA OFFSET VOLTAGE: 25µV (max) OFFSET DRIFT: 0.
1µV/°C (max) GAIN BANDWIDTH: 18MHz QUIESCENT CURRENT: 800µA FAST OVERLOAD RECOVERY SUPPLY RANGE: 2.
7V to 5.
5V SINGLE AND DUAL VERSIONS MicroPACKAGE: DFN-8, MSOP-8 DESCRIPTION The OPA381 family of transimpedance amplifiers provides 18MHz of Gain Bandwidth (GBW), with extremely high precision, excellent long-term stability, and very low 1/f noise.
The OPA381 features an offset voltage of 25µV (max), offset drift of 0.
1µV/°C (max), and bias current of 3pA.
The OPA381 far exceeds the offset, drift, and noise performance that conventional JFET op amps provide.
The signal bandwidth of a transimpedance amplifier depends largely on the GBW of the amplifier and the parasitic capacitance of the photodiode, as well as the feedback resistor.
The 18MHz GBW of the OPA381 enables a transimpedance bandwidth of > 250kHz in most configurations.
The OPA381 is ideally suited for fast control loops for power level measurement on an optical fiber.
As a result of the high precision and low-noise characteristics of the OPA381, a dynamic range of 5 decades can be achieved.
This capability allows the measurement of signal currents on the order of 10nA, and up to 1mA in a single I/V conversion stage.
In contrast to logarithmic amplifiers, the OPA381 provides very wide bandwidth throughout the full dynamic range.
By using an external pulldown resistor to –5V, the output voltage range can be extended to include 0V.
The OPA381 and OPA2381 are both available in MSOP-8 and DFN-8 (3mm x 3mm) packages.
They are specified from –40°C to +125°C.
APPLICATIONS PRECISION I/V CONVERSION PHOTODIODE MONITORING OPTICAL AMPLIFIERS CAT-SCANNER FRONT-END PHOTO LAB EQUIPMENT ...


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