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參數(shù)資料
| 型號(hào)： | EL2257CS |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | 125 MHz Single Supply, Clamping Op Amps |
| 中文描述： | 125 MHz的單電源，鉗位運(yùn)算放大器 |
| 文件頁數(shù)： | 7/21頁 |
| 文件大小： | 1617K |
| 代理商： | EL2257CS |
15
EL2257C/EL2357C
125 MHz Single Supply, Clamping Op Amps
EL
2257C/EL
2357C
Output Voltage Clamp
The EL2257C/EL2357C amplifiers have an output volt-
age clamp. This clamping action is fast, being activated
almost instantaneously, and being deactivated in < 7 ns,
and prevents the output voltage from going above the
preset clamp voltage. This can be very helpful when the
EL2257C/EL2357C are used to drive an A/D converter,
as some converters can require long times to recover if
overdriven. The output voltage remains at the clamp
voltage level as long as the product of the input voltage
and the gain setting exceeds the clamp voltage. For
example, if the EL2257C/EL2357C is connected in a
gain of 2, and +3V DC is applied to the CLAMP pin, any
voltage higher than +1.5V at the inputs will be clamped
and +3V will be seen at the output. Each amplifier of the
EL2257C have their own CLAMP pin, so individual
clamp levels may be set, whereas a single CLAMP pin
controls the clamp level of the EL2357C.
Figure 1 below is the EL2257C with each amplifier
unity gain connected. Amplifier A is being driven by a 3
Vp-p sinewave and has 2.25V applied to CLAMPA,
while amplifier B is driven by a 3 Vp-p triangle wave
and 1.5V is applied to CLAMPB. The resulting output
waveforms, with their outputs being clamped is shown
in Figure 2.
Figure 3 shows the output of amplifier A of the same
circuit being driven by a 0.5V to 2.75V square wave as
the clamp voltage is varied from 1.0V to 2.5V, as well as
the unclamped output signal. The rising edge of the sig-
nal is clamped to the voltage applied to the CLAMP pin
almost instantaneously. The output recovers from the
clamped mode within 5–7 ns, depending on the clamp
voltage. Even when the CLAMP pin is taken 0.2V below
the minimum 1.2V specified, the output is still clamped
and recovers in about 11 ns.
The clamp accuracy is affected by 1) the CLAMP pin
voltage, 2) the input voltage, and 3) the load resistor.
Depending upon the application, the accuracy may be as
little as a few tens of millivolts up to a few hundred mil-
livolts. Be sure to allow for these inaccuracies when
choosing the clamp voltage. Curves of Clamp Accuracy
vs. VCLAMP and VIN for 3 values of RL are included in
the Typical Performance Curves Section.
Figure 1.
Figure 2.
Figure 3.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2257CS-02 | 制造商:Intersil Corporation 功能描述: |
| EL2257CS-T13 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amp |
| EL2257CS-T7 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amp |
| EL2259 | 制造商:Rittal 功能描述:ENCLOSURE COMBINATION 9U |
| EL2259 | 制造商:Rittal 功能描述:COMBINATION ENCLOSURE 9U |
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