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參數(shù)資料
| 型號： | EL2386CS-T7 |
| 廠商： | ELANTEC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 250MHz Triple Current Feedback Amplifier with Disable |
| 中文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 337K |
| 代理商： | EL2386CS-T7 |
EL2386C
250 MHz Triple Current Feedback Amp wDisable
Applications Information
Contd
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage- or cur-
rent-feedback amplifier can be affected by stray
capacitance at the inverting input For inverting
gains this parasitic capacitance has little effect
because the inverting input is a virtual ground
but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors)
creates a pole in the feedback path of the amplifi-
er This pole if low enough in frequency has the
same destabilizing effect as a zero in the forward
open-loop response The use of large value feed-
back and gain resistors further exacerbates the
problem by further lowering the pole frequency
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2386C has less bandwidth than ex-
pected In this case the inverting input may have
less parasitic capacitance than expected The re-
duction of feedback resistor values (or the addi-
tion of a very small amount of external capaci-
tance at the inverting input e g 05 pF) will
increase bandwidth as desired
Please see the
curves for Frequency Response for Various RF
and RG and Frequency Response for Various
CIN-
Feedback Resistor Values
The EL2386C has been designed and specified at
gains of a1 and a2 with RF e 750X This value
of feedback resistor gives 250 MHz of b3dB
bandwidth at AV ea1 with about 25 dB of
peaking and 180 MHz of b3 dB bandwidth at
AV ea2 with about 01 dB of peaking Since
the EL2386C is a current-feedback amplifier it is
also possible to change the value of RF to get
more bandwidth As seen in the curve of Fre-
quency Response For Various RF and RG band-
width and peaking can be easily modified by
varying the value of the feedback resistor
Because the EL2386C is a current-feedback am-
plifier its gain-bandwidth product is not a con-
stant for different closed-loop gains This feature
actually allows the EL2386C to maintain about
the same b3 dB bandwidth regardless of closed-
loop gain However as closed-loop gain is in-
creased bandwidth decreases slightly while sta-
bility increases Since the loop stability is im-
proving with higher closed-loop gains it becomes
possible to reduce the value of RF below the spec-
ified 750
X and still retain stability resulting in
only a slight loss of bandwidth with increased
closed-loop gain
Supply Voltage Range and Single-
Supply Operation
The EL2386C has been designed to operate with
supply voltages having a span of greater than 3V
and less than 12V In practical terms this means
that the EL2386C will operate on dual supplies
ranging from g15V to g6V With a single-sup-
ply
the EL2386C will operate from a3V to
a
12V
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 EL2386C has an input
voltage range that extends to within 1V of either
supply So for example on a single a5V supply
the EL2386C has an input range which spans
from 1V to 4V The output range of the EL2386C
is also quite large extending to within 1V of the
supply rail On a g5V supply the output is
therefore capable of swinging from b4V to a4V
Single-supply output range is even larger because
of the increased negative swing due to the exter-
nal pull-down resistor to ground On a single
a
5V supply output voltage range is about 03V
to 4V
Video Performance
For good video performance an amplifier is re-
quired to maintain the same output impedance
and the same frequency response as DC levels are
changed at the output This is especially difficult
when driving a standard video load of 150
X be-
cause of the change in output current with DC
level Until the EL2386C good Differential Gain
could only be achieved by running high idle cur-
rents through the output transistors (to reduce
variations in output impedance) These currents
were typically comparable to the entire 3 mA
supply current of each EL2386C amplifier Spe-
10
相關(guān)PDF資料 |
PDF描述 |
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| EL2386CSZ | 250MHz Triple Current Feedback Amplifier with Disable |
| EL2386CSZ-T7 | 250MHz Triple Current Feedback Amplifier with Disable |
| EL2410CN | Low Cost, Dual, Triple and Quad Video Op Amps |
| EL2410CS | Low Cost, Dual, Triple and Quad Video Op Amps |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2386CSZ | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz Triple Current Feedback Amplifier with Disable |
| EL2386CSZT13 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz Triple Current Feedback Amplifier with Disable |
| EL2386CSZ-T7 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz Triple Current Feedback Amplifier with Disable |
| EL23G | 制造商:KODENSHI 制造商全稱:KODENSHI KOREA CORP. 功能描述:Infrared Emitting Diodes(GaAs) |
| EL-23G | 制造商:KODENSHI 制造商全稱:KODENSHI KOREA CORP. 功能描述:Infrared Emitting Diodes(GaAs) |
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