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参数资料
| 型号： | EL4444CS |
| 元件分类： | 视频放大器 |
| 英文描述： | Multiplexed-Input Video Amplifiers |
| 中文描述： | 复用输入视频放大器 |
| 文件页数： | 4/16页 |
| 文件大小： | 334K |
| 代理商： | EL4444CS |
EL4421C22C41C42C43C44C
Multiplexed-Input Video Amplifiers
Applications Information
Contd
behavior is assured In any event keeping signals
within guaranteed compliance limits will assure
freedom from overload problems
The input and output ranges are substantially
constant with temperature
Power Supplies
The mux-amps work well on any supplies from
g
3V to g15V The supplies may be of different
voltages as long as the requirements of the Gnd
pin are observed (see the Switching Characteris-
tics section for a discussion) The supplies should
be bypassed close to the device with short leads
47
mF tantalum capacitors are very good and no
smaller bypasses need be placed in parallel Ca-
pacitors as small as 001
mF can be used if small
load currents flow
Single-polarity supplies
such as a12V with
a
5V can be used as described in the Switching
Characteristics section The inputs and outputs
will have to have their levels shifted above
ground to accommodate the lack of negative sup-
ply
The dissipation of the mux-amps increases with
power supply voltage and this must be compati-
ble with the package chosen This is a close esti-
mate for the dissipation of a circuit
PD e 2VScIs maxa(VS–VO)cVO RPAR
Where
Is max is the maximum supply cur-
rent
VS is the g supply voltage (as-
sumed equal)
VO if the output voltage
RPAR is the parallel of all resistors
loading the output
For instance the EL4422 draws a maximum of
14 mA and we might require a 2V peak output
into 150
X and a 270X a270X feedback divider
The RPAR is 117X The dissipation with g5V
supplies is 191 mW The maximum Supply volt-
age that the device can run on for a given PD and
the other parameter is
VS maxe(PDaVO2 RPAR)2IsaVO RPAR)
The maximum dissipation a package support is
PD max e (TD max-TA max)RTH
Where TD max is the maximum die temper-
ature 150 C for reliability less to re-
tain optimum electrical performance
TA max is the ambient temperature
70 for commercial and 85 C for indus-
trial range
RTH is the thermal resistance of the
mounted package obtained from data
sheet dissipation curves
The most difficult case is the SO-8 package With
a maximum die temperature of 150 C and a maxi-
mum ambient temperature of 85
the 65 temper-
ature rise and package thermal resistance of
170 W gives a maximum dissipation of 382 mW
This allows a maximum supply voltage of g92V
for the EL4422 operated in our example If the
EL4421 were driving a light load (RPAR
x%)
it could operate on g15V supplies at a 70 maxi-
mum ambient
The EL4441 through EL4444 can operate on
g
12V supplies in the SO package and all parts
can be powered by g15V supplies in DIP pack-
ages
Output Loading
The output stage of the mux-amp is very power-
ful and can source 80 mA and sink 120 mA Of
course this is too much current to sustain and
the part will eventually be destroyed by excessive
dissipation or by metal traces on the die opening
The metal traces are completely reliable while de-
livering the 30 mA continuous output given in
the Absolute Maximum Ratings table in this
data sheet or higher purely transient currents
Gain or gain accuracy degrades only 10% from
no load to 100
X load Heavy resistive loading will
degrade frequency response and video distortion
only a bit becoming noticeably worse for loads
k
100
X
12
相关PDF资料 |
PDF描述 |
|---|---|
| EL4444C | Four-Input Video Amplifiers(4输入视频放大器) |
| EL4450 | Wideband Four-Quadrant Multiplier |
| EL4450C | Wideband Four-Quadrant Multiplier |
| EL4450CN | Wideband Four-Quadrant Multiplier |
| EL4450CS | Wideband Four-Quadrant Multiplier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4450 | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:Wideband Four-Quadrant Multiplier |
| EL4450C | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:Wideband Four-Quadrant Multiplier |
| EL4450CM | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Wideband Four-Quadrant Multiplier |
| EL4450CN | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL4450CS | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:Wideband Four-Quadrant Multiplier |
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