EL4452CS datasheet(7/12 Pages) ELANTEC

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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

VOUT e (VIN c

VGAIN a VREF)H

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