Precision / High-Speed Transimpedance Amplifier - Burr-Brown
Description
OPA380 OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
Precision, High-Speed Transimpedance Amplifier
FEATURES
D D D D D D D D D D D D D D D
> 1MHz TRANSIMPEDANCE BANDWIDTH EXCELLENT LONG-TERM VOS STABILITY BIAS CURRENT: 50pA (max) OFFSET VOLTAGE: 25µV (max) INPUT CURRENT RANGE: 10nA to 1mA DRIFT: 0.
1µV/°C (max) GAIN BANDWIDTH: 90MHz QUIESCENT CURRENT: 6.
5mA SUPPLY RANGE: 2.
7V to 5.
5V SINGLE AND DUAL VERSIONS MicroSize PACKAGE: MSOP-8
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 5 decades can be achieved.
This capability allows the measurement of signal currents in the order of 10nA, and up to 1mA 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 pulldown resistor to –5V, the output voltage range can be extended to include 0V.
The OPA380 (single) is available in MSOP-8 and SO-8 packages.
The OPA2380 (dual) is available in the miniature MSOP-8 package.
They are specified from –40°C to +125°C.
APPLICATIONS
PHOTODIODE MONITORING PRECISION I/V CONVERSION OPTICAL AMPLIFIERS...
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