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PDF OPA657 Data sheet ( Hoja de datos )
| Número de pieza | OPA657 | |
| Descripción | Precision / High-Speed Transimpedance Amplifier | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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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
1MΩ
3
RF
+5V
7
OPA380
VOUT
6 (0V to 4.4V)
67pF
100kΩ
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
1 page  
www.ti.com
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V
All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.
OPEN−LOOP GAIN AND PHASE vs FREQUENCY
140 90
120 Gain
45
100 0
80 −45
Phase
60 −90
40 −135
20 −180
0 −225
−20 −270
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
160
140
120
100
80
60
40
20
0
−20
0.1
POWER−SUPPLY REJECTION RATIO AND
COMMON−MODE REJECTION vs FREQUENCY
PSRR
CMRR
1 10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
1000
INPUT VOLTAGE NOISE SPECTRAL DENSITY
100
10
1
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
QUIESCENT CURRENT vs TEMPERATURE
8
7
6
VS = +5.5V
5
4
VS = +2.7V
3
2
1
0
−40 −25
0
25 50 75 100
Temperature (_ C)
125
QUIESCENT CURRENT vs SUPPLY VOLTAGE
7
6
5
4
3
2
1
0
2.7 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
1000
INPUT BIAS CURRENT vs TEMPERATURE
100
10
1
−40 −25
0
25 50 75 100 125
Temperature (_C)
5
5 Page 
www.ti.com
BIASING PHOTODIODES IN SINGLE-SUPPLY
CIRCUITS
The +IN input can be biased with a positive DC voltage
to offset the output voltage and allow the amplifier
output to indicate a true zero photodiode measurement
when the photodiode is not exposed to any light. It will
also prevent the added delay that results from coming
out of the negative rail. This bias voltage appears
across the photodiode, providing a reverse bias for
faster operation. An RC filter placed at this bias point will
reduce noise. (Refer to Figure 4.) This bias voltage can
also serve as an offset bias point for an ADC with range
that does not include ground.
CF(1)
< 1pF
RF
10MΩ
V+
λ
OPA380
VOUT
0.1µF 100kΩ
+VBias
NOTE: (1) CF is optional to prevent gain peaking.
It includes the stray capacitance of RF.
Figure 4. Filtered reverse bias voltage
TRANSIMPEDANCE AMPLIFIER
Wide bandwidth, low input bias current, and low input
voltage and current noise make the OPA380 an ideal
wideband photodiode transimpedance amplifier. Low
voltage noise is important because photodiode
capacitance causes the effective noise gain of the
circuit to increase at high frequency.
The key elements to a transimpedance design are
shown in Figure 5:
the total input capacitance (CTOT), consisting of the
photodiode capacitance (CDIODE) plus the parasitic
common-mode and differential-mode input
capacitance (3pF + 1.1pF for the OPA380);
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
the desired transimpedance gain (RF);
the Gain Bandwidth Product (GBW) for the
OPA380 (90MHz).
With these three variables set, the feedback capacitor
value (CF) can be set to control the frequency response.
CSTRAY is the stray capacitance of RF, which is 0.2pF for
a typical surface-mount resistor.
To achieve a maximally flat 2nd-order Butterworth
frequency response, the feedback pole should be set
to:
Ǹ1
2pRFǒCF ) CSTRAYǓ
+
GBW
4pRFCTOT
(1)
Bandwidth is calculated by:
Ǹf*3dB +
GBW
2pRFCTOT
Hz
(2)
These equations will result in maximum
transimpedance bandwidth. For even higher
transimpedance bandwidth, the high-speed CMOS
OPA300 (180MHz GBW), or the OPA656 (230MHz
GBW) may be used.
For additional information, refer to Application Bulletin
AB−050 (SBOA055), Compensate Transimpedance
Amplifiers Intuitively, available for download at
www.ti.com.
CF(1)
RF
10MΩ
CSTRAY(2)
+5V
λ
CTOT(3) OPA380
VOUT
RP (optional
pulldown resistor)
−5V
NOTE: (1) CF is optional to prevent gain peaking.
(2) CSTRAY is the stray capacitance of RF
(typically, 0.2pF for a surface−mount resistor).
(3) CTOT is the photodiode capacitance plus OPA380
input capacitance.
Figure 5. Transimpedance Amplifier
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet OPA657.PDF ] | |
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