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參數(shù)資料
| 型號： | EL2286C |
| 英文描述： | 250 MHz/3 mA Dual Current Mode Feedback Amplifier(250 MHz/3 mA，雙路電流模式反饋放大器) |
| 中文描述： | 250兆赫/3毫安雙路電流模式反饋放大器（250兆赫/ 3毫安，雙路電流模式反饋放大器） |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 358K |
| 代理商： | EL2286C |
EL2186CEL2286C
250 MHz3 mA Current Mode Feedback Amp wDisable
Applications Information
Product Description
The EL2186CEL2286C are current-feedback op-
erational amplifiers that offer a wide b3dB
bandwidth of 250 MHz a low supply current of
3 mA per amplifier and the ability to disable to
0 mA Both products also feature high output
current drive The EL2186C can output 100 mA
while the EL2286C can output 55 mA per ampli-
fier The EL2186CEL2286C work with supply
voltages ranging from a single 3V to g6V and
they are also capable of swinging to within 1V of
either supply on the input and the output Be-
cause of their current-feedback topology
the
EL2186CEL2286C do not have the normal gain-
bandwidth product associated with voltage-feed-
back operational amplifiers
This allows their
b
3 dB bandwidth to remain relatively constant
as closed-loop gain is increased This combina-
tion of high bandwidth and low power together
with aggressive pricing make the EL2186C
EL2286C the ideal choice for many low-power
high-bandwidth applications such as portable
computing HDSL and video processing
For Single Dual and Quad applications without
disable
consider the EL2180C (8-Pin Single)
EL2280C (8-Pin Dual) and EL2480C (14-Pin
Quad) If lower power is required refer to the
EL2170CEL2176C family which provides Sin-
gles Duals and Quads with 70 MHz of band-
width while consuming 1 mA of supply current
per amplifier
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 capacitor has been shown
to work well when placed at each supply pin
For good AC performance parasitic capacitance
should be kept to a minimum especially at the
inverting input (see the Capacitance at the In-
verting Input section) Ground plane construc-
tion should be used but it should be removed
from the area near the inverting input to mini-
mize any stray capacitance at that node Carbon
or Metal-Film resistors are acceptable with the
Metal-Film resistors giving slightly less peaking
and bandwidth because of their additional series
inductance Use of sockets particularly for the
SO package should be avoided if possible Sock-
ets add parasitic inductance and capacitance
which will result in some additional peaking and
overshoot
DisablePower-Down
The EL2186CEL2286C amplifiers can be dis-
abled placing their output in a high-impedance
state When disabled each amplifier’s supply cur-
rent is reduced to 0 mA
Each EL2186C
EL2286C
amplifier
is
disabled
when
its
ENABLE pin is floating or pulled up to within
05V of the positive supply Similarly each am-
plifier is enabled by pulling its ENABLE pin at
least 3V below the positive supply For g5V sup-
plies this means that an EL2186CEL2286C am-
plifier will be enabled when ENABLE is at 2V or
less and disabled when ENABLE is above 45V
Although the logic levels are not standard TTL
this choice of logic voltages allows the EL2186C
EL2286C to be enabled by tying ENABLE to
ground even in a3V single-supply applications
The ENABLE pin can be driven from CMOS
outputs or open-collector TTL
When enabled supply current does vary some-
what with the voltage applied at ENABLE For
example
with
the
supply
voltages
of
the
EL2186C at g5V if ENABLE is tied to b5V
(rather than ground) the supply current will in-
crease about 15% to 345 mA
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
10
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL2286CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:250MHz/3mA Current Mode Feedback Amp w/Disable |
| EL2286CS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T13 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2286CS-T7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL228-AA-1 | 制造商:SIXNET 制造商全稱:SIXNET 功能描述:Heavy Industrial Ethernet Managed Switch |
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