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OPA380

Burr-Brown
Part Number OPA380
Manufacturer Burr-Brown
Description Precision / High-Speed Transimpedance Amplifier
Published May 13, 2005
Detailed Description OPA380 OPA2380 SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 Precision, High-Speed Transimpedance Amplifier FEATUR...
Datasheet PDF File OPA380 PDF File

OPA380
OPA380

Overview
OPA380 OPA2380 SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 Precision, High-Speed Transimpedance Amplifier FEATURES D > 1MHz TRANSIMPEDANCE BANDWIDTH D EXCELLENT LONG-TERM VOS STABILITY D BIAS CURRENT: 50pA (max) D OFFSET VOLTAGE: 25µV (max) D DYNAMIC RANGE: 4 to 5 Decades D DRIFT: 0.
1µV/°C (max) D GAIN BANDWIDTH: 90MHz D QUIESCENT CURRENT: 7.
5mA D SUPPLY RANGE: 2.
7V to 5.
5V D SINGLE AND DUAL VERSIONS D MicroSize PACKAGE: MSOP-8 APPLICATIONS D PHOTODIODE MONITORING D PRECISION I/V CONVERSION D OPTICAL AMPLIFIERS D CAT-SCANNER FRONT-END 2 Photodiode 1MΩ 3 RF +5V 7 OPA380 VOUT 6 (0V to 4.
4V) 67pF 100kΩ RP (Optional Pulldown Resistor) −5V 75pF 4 DESCRIPTION The OPA380 family of transimpedance amplifiers provides high-speed (90MHz Gain Bandwidth [GBW]) operation, with extremely high precision, excellent long-term stability, and very low 1/f noise.
It is ideally suited for high-speed photodiode applications.
The OPA380 features an offset voltage of 25µV, offset drift of 0.
1µV/°C, and bias current of 50pA.
The OPA380 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 90MHz GBW of the OPA380 enables a transimpedance bandwidth of > 1MHz in most configurations.
The OPA380 is ideally suited for fast control loops for power level on an optical fiber.
As a result of the high precision and low-noise characteristics of the OPA380, a dynamic range of 4 to 5 decades can be achieved.
For example, this capability allows the measurement of signal currents on the order of 1nA, and up to 100µA in a single I/V conversion stage.
In contrast to logarithmic amplifiers, the OPA380 provides very wide bandwidth throughout the full dynamic range.
By using an external pull-down resistor to –5V, the output voltage range can be extended to include 0V.
The OP...


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