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參數(shù)資料
| 型號(hào)： | EL5493CS-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Quad 300MHz Current Feedback Amplifier with Enable |
| 中文描述： | 4 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封裝： | 0.150 INCH, SO-14 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 281K |
| 代理商： | EL5493CS-T7 |
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Applications Information
Product Description
The EL5493 is a current-feedback operational amplifier that
offers a wide -3dB bandwidth of 300MHz and a low supply
current of 4mA per amplifier. The EL5493 works with supply
voltages ranging from a single 5V to 10V and they are also
capable of swinging to within 1V of either supply on the
output. Because of its current-feedback topology, the
EL5493 does not have the normal gain-bandwidth product
associated with voltage-feedback operational amplifiers.
Instead, its -3dB bandwidth to remain relatively constant as
closed-loop gain is increased. This combination of high
bandwidth and low power, together with aggressive pricing
make the EL5493 the ideal choice for many low-power/high-
bandwidth applications such as portable, handheld, or
battery-powered equipment.
For varying bandwidth needs, consider the EL5191 with
1GHz on a 9mA supply current or the EL5192 with 600MHz
on a 6mA supply current. Versions also include single, dual,
triple, and quad amp packages.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit board
layout is necessary for optimum performance. Low
impedance ground plane construction is essential. Surface
mount components are recommended, but if leaded
components are used, 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 4.7μF
tantalum capacitor in parallel with a 0.01μF 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 Inverting Input section) Even when
ground plane construction is used, it should be removed
from the area near the inverting input to minimize 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 additional series
inductance. Use of sockets, particularly for the SO (0.150")
package, should be avoided if possible. Sockets add
parasitic inductance and capacitance which will result in
additional peaking and overshoot.
Disable/Power-Down
The EL5493A amplifier can be disabled placing its output in
a high impedance state. When disabled, the amplifier supply
current is reduced to < 600μA. The EL5493A is disabled
when its CE pin is pulled up to within 1V of the positive
supply. Similarly, the amplifier is enabled by floating or
pulling its CE pin to at least 3V below the positive supply. For
±5V supply, this means that an EL5493A amplifier will be
enabled when CE is 2V or less, and disabled when CE is
above 4V. Although the logic levels are not standard TTL,
this choice of logic voltages allows the EL5493A to be
enabled by tying CE to ground, even in 5V single supply
applications. The CE pin can be driven from CMOS outputs.
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage- or current-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 amplifier. 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 feedback and gain resistors exacerbates the problem
by further lowering the pole frequency (increasing the
possibility of oscillation.)
The EL5493 has been optimized with a 475
feedback
resistor. With the high bandwidth of these amplifiers, these
resistor values might cause stability problems when
combined with parasitic capacitance, thus ground plane is
not recommended around the inverting input pin of the
amplifier.
Feedback Resistor Values
The EL5493 has been designed and specified at a gain of +2
with R
F
approximately 500
. This value of feedback resistor
gives 200MHz of -3dB bandwidth at A
V
=2 with 2dB of
peaking. With A
V
=-2, an R
F
of approximately 500
gives
175MHz of bandwidth with 0.2dB of peaking. Since the
EL5493 is a current-feedback amplifier, it is also possible to
change the value of R
F
to get more bandwidth. As seen in
the curve of Frequency Response for Various R
F
and R
G
,
bandwidth and peaking can be easily modified by varying the
value of the feedback resistor.
Because the EL5493 is a current-feedback amplifier, its gain-
bandwidth product is not a constant for different closed-loop
gains. This feature actually allows the EL5493 to maintain
about the same -3dB bandwidth. As gain is increased,
bandwidth decreases slightly while stability increases. Since
the loop stability is improving with higher closed-loop gains,
it becomes possible to reduce the value of R
F
below the
specified 475
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 EL5493 has been designed to operate with supply
voltages having a span of greater than 5V and less than 10V.
In practical terms, this means that the EL5493 will operate
on dual supplies ranging from ±2.5V to ±5V. With single-
supply, the EL5493 will operate from 5V to 10V.
As supply voltages continue to decrease, it becomes
necessary to provide input and output voltage ranges that
EL5493, EL5493A
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