OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
Precision, High-Speed
Transimpedance Amplifier
FD EATURES
DESCRIPTION
> 1MHz TRANSIMPEDANCE BANDWIDTH
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.
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EXCELLENT LONG-TERM V
STABILITY
OS
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
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.
AD PPLICATIONS
PHOTODIODE MONITORING
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.
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PRECISION I/V CONVERSION
OPTICAL AMPLIFIERS
CAT-SCANNER FRONT-END
RF
+5V
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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
2
VOUT
(0V to 4.4V)
6
RP
OPA380 RELATED DEVICES
Photodiode
(Optional
Pulldown
Resistor)
PRODUCT
OPA300
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
FEATURES
67pF
1MΩ
150MHz CMOS, 2.7V to 5.5V Supply
−5V
500µV V , 38MHz, 2.5V to 5V Supply
OS
100kΩ
10µV V , Zero-Drift, 2.5V to 5V Supply
OS
3
16MHz GBW, Precision FET Op Amp, 15V
230MHz, Precision FET, 5V
75pF
LOG amp, 7.5 decades, 4.5V to 18V Supply
LOG amp, 7.5 decades, 2.25V to 5.5V Supply
Precision Switched Integrator
4
DDC112
Dual Current Input, 20-Bit ADC
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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