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OPA2380AIDGKR
High Speed Precision Transimpedance Amplifier
FEATURES > 1MHz TRANSIMPEDANCE BANDWIDTH EXCELLENT LONG-TERM VOS STABILITY BIAS CURRENT: 50pA (max) OFFSET VOLTAGE: 25µV (max) DYNAMIC RANGE: 4 to 5 Decades DRIFT: 0.1µV/°C (max) GAIN BANDWIDTH: 90MHz QUIESCENT CURRENT: 7.5mA SUPPLY RANGE: 2.7V to 5.5V SINGLE AND DUAL VERSIONS MicroSize PACKAGE: MSOP-8
APPLICATIONS PHOTODIODE MONITORING�
PRECISION I/V CONVERSION OPTICAL AMPLIFIERS CAT-SCANNER FRONT-END+5Vto 4.4V)
Photodiode
DESCRIPTIONThe 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 trans-
impedance 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 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.
OPA380 RELATED DEVICES
OPA380 A2380SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007
Precision, High-Speed
Transimpedance Amplifier
