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参数资料
| 型号： | EL4430CS |
| 元件分类： | 测量放大器 |
| 英文描述： | Micropower single-supply CMOS Instrumentation Amplifier |
| 中文描述： | 微功耗单电源 CMOS 仪表放大器 |
| 文件页数： | 12/12页 |
| 文件大小： | 311K |
| 代理商： | EL4430CS |
EL4430CEL4431C
Video Instrumentation Amplifiers
Applications Information
Contd
Power Supplies
The instrumentation amplifiers work well on any
supplies from g3V to g15 The supplies may be
of different voltages as long as the requirements
of the Gnd pin are observed ( see the Ground Pin
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 low as 001
mF can be used if small
load currents flow
Single-polarity supplies
such as a12V with
a
5V can be used where the ground pin is con-
nected to a5V and V- to ground The inputs and
outputs will have to have their levels shifted
above ground to accommodate the lack of nega-
tive supply
The dissipation of the amplifiers 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
PDe 2 c VS c IS max a (VSbVO)
c
VO RPAR
where IS max is the maximum supply current
VS is the g supply voltage
(assumed equal)
VO is the output voltage
RPAR is the parallel of all resistors
loading the output
For instance the EL4431 draws a maximum of
16 mA and we might require a 2V peak output
into 150
X and a 270X a 270X feedback divider
The RPAR is 117X The dissipation with g5V
supplies is 201 mW The maximum supply volt-
age that the device can run on for a given PD and
the other parameter is
VS max e (PD a VO2RPAR)
(2IS a VO RPAR)
The maximum dissipation a package can offer is
PD max e (TJ max b TA max) iJA
where TJ max is the maximum die junction
temperature 150 C for reliability less to
retain optimum electrical performance
TA max is the ambient temperature 70 C
for commercial and 85 C for industrial
range
iJA is the thermal resistance of the
mounted package
obtained from data-
sheet dissipation curves
The more difficult case is the SO-8 package With
a maximum die temperature of 150 C and a maxi-
mum ambient temperature of 85 C the 65 C tem-
perature rise and package thermal resistance of
170 CW gives a dissipation of 382 mW at 85 C
This allows a maximum supply voltage of g85V
for the EL4431 operated in our example If an
EL4430 were driving a light load (RPAR
x%)
it could operate on g15V supplies at a 70 C max-
imum ambient
Output Loading
The output stage of the instrumentation amplifi-
ers is very powerful
It typically can source
80 mA and sink 120 mA Of course this is too
much current to sustain and the part will eventu-
ally be destroyed by excessive dissipation or by
metal traces on the die opening The metal traces
are completely reliable while delivering the
30 mA continuous output given in the Absolute
Maximum Ratings table in this datasheet 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
for loads k100
X
Capacitive loads will cause peaking in the fre-
quency response If capacitive loads must be driv-
en a small-valued series resistor can be used to
isolate it (12
X to 51X should suffice) A 22X se-
ries resistor will limit peaking to 25 dB with
even a 220 pF load
9
相关PDF资料 |
PDF描述 |
|---|---|
| EL4431CN | Micropower single-supply CMOS Instrumentation Amplifier |
| EL4431CS | Micropower single-supply CMOS Instrumentation Amplifier |
| EL4431C | Video Instrumentation Amplifier |
| EL4431C | Video Instrumentation Amplifiers(视频仪用放大器) |
| EL4441CN | Multiplexed-Input Video Amplifiers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4431C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Video Instrumentation Amplifier |
| EL4431CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Instrumentation Amplifiers |
| EL4431CS | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Instrumentation Amplifiers |
| EL4432CN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Instrumentation Amp， Resistor-Programmable |
| EL4432CS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Instrumentation Amp， Resistor-Programmable |
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