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OPA656

Description
Precision, High-Speed Transimpedance Amplifier
Categoryaccessories   
File Size348KB,18 Pages
ManufacturerBurr-Brown
Websitehttp://www.burr-brown.com/
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OPA656 Overview

Precision, High-Speed Transimpedance Amplifier

OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
Precision, High-Speed
Transimpedance Amplifier
FEATURES
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
> 1MHz TRANSIMPEDANCE BANDWIDTH
EXCELLENT LONG-TERM V
OS
STABILITY
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
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 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.
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.
APPLICATIONS
PHOTODIODE MONITORING
PRECISION I/V CONVERSION
OPTICAL AMPLIFIERS
CAT-SCANNER FRONT-END
R
F
+5V
7
2
OPA380
6
V
OUT
(0V to 4.4V)
Photodiode
1MΩ
67pF
−5V
100kΩ
3
75pF
R
P
(Optional
Pulldown
Resistor)
OPA380 RELATED DEVICES
PRODUCT
OPA300
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
DDC112
FEATURES
150MHz CMOS, 2.7V to 5.5V Supply
500µV VOS, 38MHz, 2.5V to 5V Supply
10µV VOS, 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
Precision Switched Integrator
Dual Current Input, 20-Bit ADC
4
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
2003-2004, Texas Instruments Incorporated
www.ti.com

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OPA656 LOG112 OPA2380 OPA380 OPA657 DDC112 OPA300 IVC102
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