OPA2380

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 fib...