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EL4452CS Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL4452CS
Beschreibung Wideband Variable-Gain Amplifier with Gain of 10
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 12 Seiten
EL4452CS Datasheet, Funktion
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Features
 Complete variable-gain amplifier
complete with output amplifier
 Compensated for Gain t 10
 50 MHz signal bandwidth
 50 MHz gain-control bandwidth
 Low 29 nV SHz input noise
 Operates on g5V to g15V
supplies
 All inputs are differential
 l70 dB attenuation 5 MHz
Applications
 AGC variable-gain amplifier
 IF amplifier
 Transducer amplifier
Ordering Information
Part No Temp Range Package Outline
EL4452CN b40 C to a85 C 14-pin P-DIP MDP0031
EL4452CS b40 C to a85 C 14-lead SO MDP0027
General Description
The EL4452 is a complete variable-gain circuit It offers wide
bandwidth and excellent linearity while including a powerful
output voltage amplifier drawing modest current The higher
gain and lower input noise makes the EL4452 ideal for use in
AGC systems
The EL4452 operates on g5V to g15V and has an analog input
range of g0 5V AC characteristics do not change appreciably
over the supply range
The circuit has an operational temperature of b40 C to a85 C
and is packaged in 14-pin P-DIP and SO-14
The EL4452 is fabricated with Elantec’s proprietary comple-
mentary bipolar process which gives excellent signal symmetry
and is very rugged
Connection Diagram
4452 – 1
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ‘‘controlled document’’ Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1994 Elantec Inc






EL4452CS Datasheet, Funktion
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Typical Performance Curves
Bias Current
vs Die Temperature
Contd
Gain vs VGAIN
Change in
VG 100% and VG 0%
vs Die Temperature
4452 – 15
VG 0% and VG 100%
vs Supply Voltage
4452 – 16
Common Mode
Input Range
vs Supply Voltage
4452 – 17
Supply Current
vs Supply Voltage
4452 – 18
4452 – 19
6
4452 – 20

6 Page









EL4452CS pdf, datenblatt
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Applications Information Contd
In this circuit the EL4450 not only calculates the
square of the input but also provides the offset
integrator function The product of the two mul-
tiplier inputs adds to the bReference input and
are passed to the output amplifier which
through CF behaves as a pseudo-integrator The
‘‘integrator’’ gain does not pass through zero at
high frequencies but has a zero at 1 (2qCF c 1
kX) This zero is cancelled by the pole caused by
the second capacitor of value CF connected at the
EL4452 bVGAIN input The bReference can be
exchanged for a positive reference by connecting
it to the ground return of the 1 kX resistor at the
FB terminal and grounding REF
As a general consideration the input signal ap-
plied to an EL4452 should be kept below about
250 mV peak for good linearity If the AGC were
designed to produce a 1V peak output the input
range would be 100 mV–250 mV peak when the
EL4452 has a feedback network that establishes a
maximum gain of 10 This is an input range of
only 2 5 1 for precise output regulation Raising
the maximum gain to 25 allows a 40 mV–250 mV
input range with the output still regulated better
than 6 1 Unfortunately the bandwidth will be
reduced Bandwidth can be maintained by adding
a high frequency op-amp cascaded with the out-
put to make up gain beyond the 10 of the
EL4452 current feedback devices being the most
flexible The op-amp’s input should be capacitor
coupled to prevent gained-up offsets from confus-
ing the level detector during AGC control line
variations
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement
Elantec Inc
1996 Tarob Court
Milpitas CA 95035
Telephone (408) 945-1323
(800) 333-6314
Fax (408) 945-9305
European Office 44-71-482-4596
WARNING Life Support Policy
Elantec Inc products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec Inc Life Support systems are equipment in-
tended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death Users contemplating application of Elantec Inc products
in Life Support Systems are requested to contact Elantec Inc
factory headquarters to establish suitable terms conditions for
these applications Elantec Inc ’s warranty is limited to replace-
ment of defective components and does not cover injury to per-
sons or property or other consequential damages
12 Printed in U S A

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