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EL4452CS датащи(PDF) 7 Page - Elantec Semiconductor

номер детали EL4452CS
подробное описание детали  Wideband Variable-Gain Amplifier with Gain of 10
PDF  12 Pages
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производитель  ELANTEC [Elantec Semiconductor]
домашняя страница  http://www.elantec.com
Logo ELANTEC - Elantec Semiconductor

EL4452CS датащи(HTML) 7 Page - Elantec Semiconductor

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EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Typical Performance Curves
Contd
Supply Current
vs Die Temperature
4452 – 21
14-Pin Package
Power Dissipation vs
Ambient Temperature
4452 – 22
Applications Information
The EL4452 is a complete two-quadrant multipli-
ergain control with 50 MHz bandwidth It has
three sets of inputs a differential signal input
VIN a differential gain-controlling input VGAIN
and another differential input which is used to
complete a feedback loop with the output Here is
a typical connection
4451-23
The gain of the feedback divider is H The trans-
fer function of the part is
VOUT e AO c (((VINa) b (VINb)) c ((VGAINa) b (VGAINb)) a
(VREF b VFB))
VFB is connected to VOUT through a feedback
network so VFB e H c VOUT AO is the open-
loop gain of the amplifier and is approximately
3300 The large value of AO drives
((VINa) b (VINb)) c
((VGAINa) b (VGAINb)) a (VREF b VFB)
x 0
Rearranging and substituting for VFB
VOUT e (((VINa) b (VINb)) c
((VGAINa) b (VGAIN)) a VREF)H
or
VOUT e (VIN c
VGAIN a VREF)H
7



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