參數(shù)資料
型號(hào)： EL2357C
英文描述： 125 MHz Single Supply, Clamping Op Amps(125 MHz，單電源鉗位運(yùn)算放大器)
中文描述： 125 MHz的單電源，夾緊運(yùn)算放大器（125兆赫，單電源鉗位運(yùn)算放大器）
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 518K
代理商： EL2357C
EL2257CEL2357C
125 MHz Single Supply Clamping Op Amps
Applications Information
Product Description
The EL2257CEL2357C are the industries fastest
single supply operational amplifiers Connected
in voltage follower mode their b3 dB bandwidth
is 125 MHz while maintaining a 275 V
ms slew
rate With an input and output common mode
range that includes ground these amplifiers were
optimized for single supply operation but will
also accept dual supplies They operate on a total
supply voltage range as low as a27V or up to
a
12V This makes them ideal for a3V applica-
tions especially portable computers
While many amplifiers claim to operate on a sin-
gle supply and some can sense ground at their
inputs most fail to truly drive their outputs to
ground If they do succeed in driving to ground
the amplifier often saturates causing distortion
and recovery delays However special circuitry
built into the EL2257CEL2357C allows the out-
put to follow the input signal to ground without
recovery delays
Power Supply Bypassing And Printed
Circuit Board Layout
As with any high-frequency device good printed
circuit board layout is necessary for optimum
performance Ground plane construction is high-
ly recommended Lead lengths should be as short
as possible The power supply pins must be well
bypassed to reduce the risk of oscillation The
combination of a 47
mF tantalum capacitor in
parallel with a 01
mF ceramic capacitor has been
shown to work well when placed at each supply
pin For single supply operation where the GND
pin is connected to the ground plane a single
47
mF tantalum capacitor in parallel with a
01
mF ceramic capacitor from the VSa pin to the
GND pin will suffice
For good AC performance parasitic capacitance
should be kept to a minimum Ground plane con-
struction should be used Carbon or Metal-Film
resistors are acceptable with the Metal-Film re-
sistors giving slightly less peaking and band-
width because of their additional series induc-
tance Use of sockets particularly for the SO
package should be avoided if possible Sockets
add parasitic inductance and capacitance which
will result in some additional peaking and over-
shoot
Supply Voltage Range and Single-
Supply Operation
The EL2257CEL2357C have been designed to
operate with supply voltages having a span of
greater than 27V and less than 12V In practical
terms this means that the EL2257CEL2357C
will operate on dual supplies ranging from
g
135V to g6V
With a single-supply
the
EL2257CEL2357C will operate from a27V to
a
12V Performance has been optimized for a sin-
gle a5V supply
Pins 11 and 4 (14 and 3) are the power supply
pins on the EL2257C (EL2357C) The positive
power supply is connected to pin 11 (14) When
used in single supply mode pin 4 (3) is connected
to ground When used in dual supply mode the
negative power supply is connected to pin 4 (3)
As supply voltages continue to decrease it be-
comes necessary to provide input and output
voltage ranges that can get as close as possible to
the supply voltages
The EL2257CEL2357C
have an input voltage range that includes the
negative supply and extends to within 12V of the
positive supply So for example on a single a5V
supply the EL2257CEL2357C have an input
range which spans from 0V to 38V
The output range of the EL2257CEL2357C is
also quite large It includes the negative rail and
extends to within 1V of the top supply rail with a
1k
X load On a a5V supply the output is there-
fore capable of swinging from 0V to a4V On
split supplies the output will swing g4V If the
load resistor is tied to the negative rail and split
supplies are used the output range is extended to
the negative rail
Choice Of Feedback Resistor RF
The feedback resistor forms a pole with the input
capacitance As this pole becomes larger phase
margin is reduced This increases ringing in the
13
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EL2357CN 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述:
EL2357CS 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:125 MHz Single Supply, Clamping Op Amps
EL2357CS-02 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述:
EL2360 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Triple 130MHz Current Feedback Amplifier
EL2360C 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:Triple 130 MHz Current Feedback Amplifier
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