OPA656

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 1m...