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PDF OPA358 Data sheet ( Hoja de datos )
| Número de pieza | OPA358 | |
| Descripción | 3V Video Amplifier with 6dB Gain and Filter in SC70 | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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OPA358
SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005
3V Single-Supply
80MHz High-Speed Op Amp in SC70
FEATURES
DESCRIPTION
D HIGH BANDWIDTH: 80MHz
D HIGH SLEW RATE: 55V/µs
The high-speed OPA358 amplifier is optimized for 3V
single-supply operation. The output typically swings within
D EXCELLENT VIDEO PERFORMANCE
− 0.5dB GAIN FLATNESS: 25MHz
− DIFFERENTIAL GAIN: 0.3%
− DIFFERENTIAL PHASE: 0.7°
D INPUT RANGE INCLUDES GROUND
D RAIL-TO-RAIL OUTPUT
D SHUTDOWN CURRENT: < 5µA
D LOW QUIESCENT CURRENT: 5.2mA
5mV of GND with a 150Ω load connected to GND. The
input common-mode range includes GND and swings to
within 1V of the positive power supply. The OPA358 offers
excellent video performance: 0.5dB gain flatness is
25MHz, differential gain is 0.3%, and differential phase is
0.7°.
The OPA358 is optimized for supply voltages from +2.7V
to +3.3V, with an operating range of +2.5V to +3.6V.
Quiescent current is only 5.2mA per channel.
D SINGLE-SUPPLY OPERATING RANGE:
+2.7V to +3.3V
D MicroSIZE PACKAGE: SC70-6
In shutdown mode, the quiescent current is reduced to
< 5µA, dramatically reducing power consumption. This is
especially important in battery-operated equipment such
APPLICATIONS
D DIGITAL STILL CAMERAS
D CAMERA PHONES
as digital still cameras (DSCs) or mobile phones with DataShee
integrated cameras.
DataSheet4U.Tcohme OPA358 is available in SC70-6, the smallest package
currently available for video applications.
D DIGITAL MEDIA PLAYERS
D DIGITAL VIDEO CAMERAS
OPA358 RELATED PRODUCTS
D SET-TOP-BOX VIDEO FILTERS
FEATURES
PRODUCT
D OPTICAL POWER MONITORING
G = 2, Internal Filter, Sag Correction, Shutdown, Video Amp OPA360
D TRANSIMPEDANCE AMPLIFIERS
100MHz GBW, RR I/O, Shutdown, CMOS Amp
OPA357
D AUTOMATIC TEST EQUIPMENT
200MHz GBW, RR Out, Shutdown, CMOS Amp
OPA355
38MHz GBW, RR I/O, CMOS Amp
OPA350
> 200MHz, Shutdown, Video Buffer Amp, G = 2
OPA692
100MHz BW, Differential Input/Output, 3.3V Supply
THS412x
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.
DataSheet4U.coAlml 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 2004−2005, Texas Instruments Incorporated
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OPA358
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SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, RL = 150Ω connected to VS/2, unless otherwise noted.
8
7
6
5
4
3
2
1
0
−50
QUIESCENT CURRENT vs TEMPERATURE
−25 0
25 50 75 100
Temperature (_C)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
−50
SHUTDOWN CURRENT vs TEMPERATURE
−25 0
25 50 75 100
Temperature (_ C)
125
et4U.com
10
1
0.1
0.01
0.001
−50
INPUT BIAS CURRENT vs TEMPERATURE
OPEN−LOOP GAIN, COMMON−MODE REJECTION, AND
POWER−SUPPLY REJECTION RATIO vs TEMPERATURE
110 AOL
100
90
PSRR
80
DataSheet4U.com 70
60
CMRR
50
40
30
20
10
−25 0 25 50 75 100
Temperature (_ C)
0
−50
−25
0
25 50 75 100
Temperature (_ C)
DataShee
(V+)
(V+) − 0.5
(V+) − 1.0
(V+) − 1.5
(V−) + 1.5
(V−) + 1.0
(V−) + 0.5
(V−)
0
OUTPUT VOLTAGE vs OUTPUT CURRENT
85_C
−55_C
25_C
85_C
−55_ C
25_C
20 40 60 80
Output Current (mA)
100
G=2
LARGE−SIGNAL TRANSIENT
Time (25ns/div)
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OPA358
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CAPACITIVE LOAD AND STABILITY
The OPA358 can drive a wide range of capacitive loads.
However, all op amps under certain conditions may
become unstable. Op amp configuration, gain, and load
value are just a few of the factors to consider when
determining stability. An op amp in unity-gain configuration
is most susceptible to the effects of capacitive loading. The
capacitive load reacts with the op amp output resistance,
along with any additional load resistance, to create a pole
in the small-signal response that degrades the phase
margin.
One method of improving capacitive load drive in the
unity-gain configuration is to insert a 10Ω to 20Ω resistor
in series with the output, as shown in Figure 10. This
significantly reduces ringing with large capacitive loads.
However, if there is a resistive load in parallel with the
capacitive load, RS creates a voltage divider. This
introduces a DC error at the output and slightly reduces
output swing. This error may be insignificant. For instance,
with RL = 10kΩ and RS = 20Ω, there is only about a 0.2%
error at the output.
SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005
The key elements to a transimpedance design, as shown
in Figure 11, are the expected diode capacitance
(including the parasitic input common-mode and
differential-mode input capacitance (1.5 + 1.5)pF for the
OPA358), the desired transimpedance gain (RF), and the
Gain Bandwidth Product (GBW) for the OPA358 (80MHz).
With these 3 variables set, the feedback capacitor value
(CF) may be set to control the frequency response.
CF
<1pF
(prevents gain peaking)
RF
10MΩ
+V
λ
CD OPA358
VOUT
V+
RS
OPA358
VIN RL
To enable,
connect to V+
or drive with logic.
To enable,
connect to V+
or drive with logic.
DataShee
VOUT Figure 11. Transimpedance Amplifier
CL DataSheet4U.Tcoomachieve a maximally flat 2nd-order Butterworth
frequency response, the feedback pole should be set to:
Ǹ1
2pRFCF
+
GBW
4pRFCD
(1)
Figure 10. Series Resistor in Unity-Gain
Configuration Improves Capacitive Load Drive
WIDEBAND TRANSIMPEDANCE AMPLIFIER
Wide bandwidth, low input bias current, and low input
voltage and current noise make the OPA358 an ideal
wideband photodiode transimpedance amplifier for
low-voltage single-supply applications. Low-voltage noise
is important because photodiode capacitance causes the
effective noise gain of the circuit to increase at high
frequency.
Typical surface-mount resistors have a parasitic
capacitance of around 0.2pF that must be deducted from
the calculated feedback capacitance value.
Bandwidth is calculated by:
Ǹf*3dB +
GBW
2pRFC
D
Hz
(2)
For even higher transimpedance bandwidth, the CMOS
OPA380 (90MHz GBW), OPA355 (200MHz GBW), or the
OPA655 (400MHz GBW) may be used.
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| PDF Descargar | [ Datasheet OPA358.PDF ] | |
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