參數(shù)資料
型號: 5962-9553601QXA
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運算放大器
英文描述: OP-AMP, 7000 uV OFFSET-MAX, 200 MHz BAND WIDTH, CDSO10
封裝: CERAMIC, SOIC-10
文件頁數(shù): 10/24頁
文件大小: 800K
代理商: 5962-9553601QXA
Power Supply Bypassing
Bypassing the power supply is necessary to maintain low
power supply impedance across frequency. Both positive and
negative power supplies should be bypassed individually by
placing 0.01
μF ceramic capacitors directly to power supply
pins and 2.2
μF tantalum capacitors close to the power supply
pins.
20159511
FIGURE 2. Power Supply Bypassing
Termination
In high frequency applications, reflections occur if signals are
not properly terminated. Figure 3 shows a properly terminated
signal while Figure 4 shows an improperly terminated signal.
20159517
FIGURE 3. Properly Terminated Signal
20159518
FIGURE 4. Improperly Terminated Signal
To minimize reflection, coaxial cable with matching charac-
teristic impedance to the signal source should be used. The
other end of the cable should be terminated with the same
value terminator or resistor. For the commonly used cables,
RG59 has 75
Ω characteristic impedance, and RG58 has
50
Ω characteristic impedance.
Driving Capacitive Loads
Amplifiers driving capacitive loads can oscillate or have ring-
ing at the output. To eliminate oscillation or reduce ringing, an
isolation resistor can be placed as shown below in Figure 5.
The combination of the isolation resistor and the load capac-
itor forms a pole to increase stability by adding more phase
margin to the overall system. The desired performance de-
pends on the value of the isolation resistor; the bigger the
isolation resistor, the more damped the pulse response be-
comes. For LM7171, a 50
Ω isolation resistor is recommended
for initial evaluation. Figure 6 shows the LM7171 driving a 150
pF load with the 50
Ω isolation resistor.
20159512
FIGURE 5. Isolation Resistor Used
to Drive Capacitive Load
www.national.com
18
LM7171QML
相關(guān)PDF資料
PDF描述
5962F9553602VHA OP-AMP, 7000 uV OFFSET-MAX, 200 MHz BAND WIDTH, CDFP10
5962F9553602VXA OP-AMP, 7000 uV OFFSET-MAX, 200 MHz BAND WIDTH, CDSO10
5962F9553601VHA OP-AMP, 7000 uV OFFSET-MAX, 200 MHz BAND WIDTH, CDFP10
5962F9553601VPA OP-AMP, 7000 uV OFFSET-MAX, 200 MHz BAND WIDTH, CDIP8
5962F9553601VXA OP-AMP, 1500 uV OFFSET-MAX, 170 MHz BAND WIDTH, CDSO10
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