OPA380
OPA2380
SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007
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)
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
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 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.
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PRECISION I/V CONVERSION
OPTICAL AMPLIFIERS
CAT-SCANNER FRONT-END
RF
+5V
7
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
Photodiode
(Optional
Pulldown
Resistor)
OPA380 RELATED DEVICES
67pF
1MΩ
PRODUCT
OPA300
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
FEATURES
−5V
150MHz CMOS, 2.7V to 5.5V Supply
100kΩ
500µV V , 38MHz, 2.5V to 5V Supply
OS
10µV V , Zero-Drift, 2.5V to 5V Supply
3
OS
75pF
16MHz GBW, Precision FET Op Amp, 15V
230MHz, Precision FET, 5V
4
LOG amp, 7.5 decades, 4.5V to 18V Supply
LOG amp, 7.5 decades, 2.25V to 5.5V Supply
Precision Switched Integrator
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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