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PDF ( 数据手册 , 数据表 ) LOG112

零件编号 LOG112
描述 Precision/ High-Speed Transimpedance Amplifier
制造商 Burr-Brown Corporation
LOGO Burr-Brown Corporation LOGO 


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LOG112 数据手册, 描述, 功能
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
Precision, High-Speed
Transimpedance Amplifier
FEATURES
D > 1MHz TRANSIMPEDANCE BANDWIDTH
D EXCELLENT LONG-TERM VOS STABILITY
D BIAS CURRENT: 50pA (max)
D OFFSET VOLTAGE: 25µV (max)
D INPUT CURRENT RANGE: 10nA to 1mA
D DRIFT: 0.1µV/°C (max)
D GAIN BANDWIDTH: 90MHz
D QUIESCENT CURRENT: 6.5mA
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
1M
3
RF
+5V
7
OPA380
VOUT
6 (0V to 4.4V)
67pF
100k
RP
(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 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
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
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
DDC112
Dual Current Input, 20-Bit ADC
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







LOG112 pdf, 数据表
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued)
All specifications at TA = +25°C, RL = 2kconnected to VS/2, and VOUT = VS/2, unless otherwise noted.
www.ti.com
SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE
50
2. 5 p F
45
10k
40
+5V
35
30 O PA 380
RS
VOUT
25 C R P = 2k
20
15
No RS
10
5
5V
RS = 100
0
10
100 1000
Load Capacitance (pF)
SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE
50
2.5pF
45
40 10k
35 +2.5V
30 RS
OPA380
25
VO U T
20 C RF = 2k
2.5V
15
10
5
0
10
No RS
100
RS = 100
1000
Load Capacitance (pF)
OVERLOAD RECOVERY
VOUT
VP = 5V
VP = 0V
IIN
1.6 mA
3.2pF
5 0k
+5V
V OUT
2 k
VP
SMALL−SIGNAL STEP RESPONSE
RL = 2k
IIN
Time (100ns/div)
LARGE−SIGNAL STEP RESPONSE
RL = 2k
2.5pF
10k
2. 5V
2.5V
2k
Time (100ns/div)
Time (100ns/div)
CHANNEL SEPARATION vs INPUT FREQUENCY
140
120
100
80
60
40
20
0
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
8







LOG112 equivalent, schematic









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