OPA380AID Datasheet, PDF (1/22 Pages) Texas Instruments – Precision, High-Speed Transimpedance Amplifier

OPA380
OPA2380
SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007
Precision, High-Speed
Transimpedance Amplifier
FEATURES
D > 1MHz TRANSIMPEDANCE BANDWIDTH
D EXCELLENT LONG-TERM V_OS 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
R_F
+5V
7
OPA380
V_OUT
6 ^{(0V to 4.4V)}
67pF
100kΩ
R_P
(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 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
PRODUCT FEATURES
OPA300
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
150MHz CMOS, 2.7V to 5.5V Supply
500µV V_OS, 38MHz, 2.5V to 5V Supply
10µV V_OS, Zero-Drift, 2.5V to 5V Supply
16MHz GBW, Precision FET Op Amp, ±15V
230MHz, Precision FET, ±5V
LOG amp, 7.5 decades, ±4.5V to ±18V Supply
LOG amp, 7.5 decades, ±2.25V to ±5.5V Supply
IVC102
Precision Switched Integrator
DDC112
Dual Current Input, 20-Bit ADC
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PRODUCTION DATA information is current as of publication date. Products
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Production processing does not necessarily include testing of all parameters.
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