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參數(shù)資料
| 型號： | LOG114 |
| 元件分類： | 跨阻放大器 |
| 英文描述： | Precision, High-Speed Transimpedance Amplifier |
| 中文描述： | 精密，高速互阻抗放大器 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 362K |
| 代理商： | LOG114 |
FEATURES
> 1MHz TRANSIMPEDANCE BANDWIDTH
EXCELLENT LONG-TERM V
OS
STABILITY
BIAS CURRENT: 50pA (max)
OFFSET VOLTAGE: 25
μ
V (max)
INPUT CURRENT RANGE: 10nA to 1mA
DRIFT: 0.1
μ
V/
°
C (max)
GAIN BANDWIDTH: 90MHz
QUIESCENT CURRENT: 6.5mA
SUPPLY RANGE: 2.7V to 5.5V
SINGLE AND DUAL VERSIONS
Micro
Size PACKAGE: MSOP-8
APPLICATIONS
PHOTODIODE MONITORING
PRECISION I/V CONVERSION
OPTICAL AMPLIFIERS
CAT-SCANNER FRONT-END
1M
R
F
100k
+5V
7
2
3
4
6
OPA380
67pF
75pF
5V
R
(Optional
Pulldown
Resistor)
V
(0V to 4.4V)
Photodiode
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 25
μ
V, offset drift of 0.1
μ
V/
°
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.
OPA380 RELATED DEVICES
PRODUCT
OPA300
FEATURES
150MHz CMOS, 2.7V to 5.5V Supply
500
μ
V VOS, 38MHz, 2.5V to 5V Supply
10
μ
V 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
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
DDC112
Dual Current Input, 20-Bit ADC
OPA380
OPA2380
SBOS291E NOVEMBER 2003 REVISED NOVEMBER 2004
Precision, High-Speed
Transimpedance Amplifier
!
!
www.ti.com
Copyright
2003-2004, Texas Instruments Incorporated
All trademarks are the property of their respective owners.
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.
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