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參數(shù)資料
| 型號： | EL2157 |
| 廠商： | Intersil Corporation |
| 英文描述： | 125MHz Single Supply, Clamping Op Amps |
| 中文描述： | 125MHz的單電源，鉗位運算放大器 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 488K |
| 代理商： | EL2157 |
EL2150CEL2157C
125 MHz Single Supply Clamping Op Amps
Applications Information
Contd
Output Voltage Clamp
The EL2157C amplifier has an output voltage
clamp This clamping action is fast being acti-
vated almost instantaneously and being deacti-
vated in k 7 ns and prevents the output voltage
from going above the preset clamp voltage This
can be very helpful when the EL2157C is used to
drive an AD 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 If the
EL2157C is connected in a gain of 2 for example
and a3V DC is applied to the CLAMP pin any
voltage higher than a15V at the inputs will be
clamped and a3V will be seen at the output
Figure 1 below is a unity gain connected
EL2157C being driven by a 3Vp-p sinewave with
225V applied to the CLAMP pin The resulting
output waveform with its output being clamped
to 225V is shown in Figure 2
2150 – 59
Figure 1
2150 – 60
Figure 2
Figure 3 shows the output of the same circuit
being driven by a 05V to 275V square wave as
the clamp voltage is varied from 10V to 25V as
well as the unclamped output signal The rising
edge of the signal is clamped to the voltage ap-
plied to the CLAMP pin almost instantaneously
The output recovers from the clamped mode
within5-7ns depending on the clamp voltage
Even when the CLAMP pin is taken 02V below
the minimum 12V specified the output is still
clamped and recovers in about 11 ns
2150 – 61
Figure 3
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 ac-
curacy may be as little as a few tens of millivolts
to a few hundred millivolts Be sure to allow for
these inaccuracies when choosing the clamp volt-
age Curves of Clamp Accuracy vs VCLAMP and
VIN for 3 values of RL are included in the Typi-
cal Performance Curves Section
Unlike amplifiers that clamp at the input and are
therefore limited to non-inverting applications
only
the EL2157C output clamp architecture
works for both inverting and non-inverting gain
applications There is also no maximum voltage
difference limitation between VIN and VCLAMP
which is common on input clamped architec-
tures
The voltage clamp operates for any voltage be-
tween a12V above the GND pin and the mini-
mum output voltage swing VOP Forcing the
CLAMP pin much below a12V can saturate
transistors and should therefore be avoided
14
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