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參數(shù)資料
| 型號： | EL2244CMZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO16 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, SO-16 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 445K |
| 代理商： | EL2244CMZ |
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EL2244C, EL2444C
Dual/Quad Low-Power 120MHz Unity-Gain Stable Op Amp
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bandwidth product divided by the noise gain of the cir-
cuit. For gains less than 4, higher-order poles in the
amplifiers' transfer function contribute to even higher
closed loop bandwidths. For example, the
EL2244C/EL2444C have a -3dB bandwidth of 120MHz
at a gain of +1, dropping to 60MHz at a gain of +2. It is
important to note that the EL2244C/EL2444C have been
designed so that this “extra” bandwidth in low-gain
applications does not come at the expense of stability.
As seen in the typical performance curves, the
EL2244C/EL2444C in a gain of +1 only exhibit 1.0dB
of peaking with a 1000
load.
Video Performance
An industry-standard method of measuring the video
distortion of components such as the EL2244C/
EL2444C is to measure the amount of differential gain
(dG) and differential phase (dP) that they introduce. To
make these measurements, a 0.286VPP (40 IRE) signal is
applied to the device with 0V DC offset (0 IRE) at either
3.58MHz for NTSC or 4.43MHz for PAL. A second
measurement is then made at 0.714V DC offset (100
IRE). Differential gain is a measure of the change in
amplitude of the sine wave, and is measured in percent.
Differential phase is a measure of the change in phase,
and is measured in degrees.
For signal transmission and distribution, a back-termi-
nated cable (75
in series at the drive end, and 75 to
ground at the receiving end) is preferred since the
impedance match at both ends will absorb any reflec-
tions. However, when double termination is used, the
received signal is halved; therefore a gain of 2 configu-
ration is typically used to compensate for the
attenuation.
The EL2244C/EL2444C have been designed as an eco-
nomical solution for applications requiring low video
distortion. They have been thoroughly characterized for
video performance in the topology described above, and
the results have been included as typical dG and dP
specifications and as typical performance curves. In a
gain of +2, driving 150
, with standard video test levels
at the input, the EL2244C/EL2444C exhibit dG and dP
of only 0.04% and 0.15° at NTSC and PAL. Because dG
and dP can vary with different DC offsets, the video per-
formance of the EL2244C/EL2444C has been
characterized over the entire DC offset range from -
0.714V to +0.714V. For more information, refer to the
curves of dG and dP vs DC Input Offset.
Output Drive Capability
The EL2244C/EL2444C have been designed to drive
low impedance loads. They can easily drive 6VPP into a
150 load. This high output drive capability makes the
EL2244C/EL2444C an ideal choice for RF, IF and video
applications. Furthermore, the current drive of the
EL2244C/EL2444C remains a minimum of 35 mA at
low temperatures. The EL2244C/EL2444C are current-
limited at the output, allowing it to withstand shorts to
ground. However, power dissipation with the output
shorted can be in excess of the power-dissipation capa-
bilities of the package.
Capacitive Loads
For ease of use, the EL2244C/EL2444C have been
designed to drive any capacitive load. However, the
EL2244C/EL2444C remain stable by automatically
reducing their gain-bandwidth product as capacitive
load increases. Therefore, for maximum bandwidth,
capacitive loads should be reduced as much as possible
or isolated via a series output resistor (Rs). Similarly,
coax lines can be driven, but best AC performance is
obtained when they are terminated with their character-
istic impedance so that the capacitance of the coaxial
cable will not add to the capacitive load seen by the
amplifier. Although stable with all capacitive loads,
some peaking still occurs as load capacitance increases.
A series resistor at the output of the EL2244C/EL2444C
can be used to reduce this peaking and further improve
stability.
Printed-Circuit Layout
The EL2244C/EL2444C are well behaved, and easy to
apply in most applications. However, a few simple tech-
niques will help assure rapid, high quality results. As
with any high-frequency device, good PCB layout is
necessary for optimum performance. Ground-plane con-
struction is highly recommended, as is good power
supply bypassing. A 0.1 F ceramic capacitor is recom-
mended for bypassing both supplies. Lead lengths
should be as short as possible, and bypass capacitors
should be as close to the device pins as possible. For
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