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PDF EL4452CN Data sheet ( Hoja de datos )
| Número de pieza | EL4452CN | |
| Descripción | Wideband Variable-Gain Amplifier with Gain of 10 | |
| Fabricantes | Elantec Semiconductor | |
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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
1 page  
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Typical Performance Curves Contd
Gain and b3 dB Bandwidth
vs Load Resistance
Input Common-Mode
Rejection Ratio
vs Frequency
Slew Rate
vs Supply Voltage
4452 – 9
Slew Rate
vs Die Temperature
4452 – 10
Input Voltage Noise
vs Frequency
4452 – 11
Nonlinearity
vs Input Signal
4452 – 12
4452 – 13
5
4452 – 14
5 Page 
EL4452C
Wideband Variable-Gain Amplifier with Gain of 10
Applications Information Contd
The output of the EL4452 drives a diode detector
which is compared to VREF by an offset integra-
tor Its output feeds the gain-control input of the
EL4452 The integrator’s output is attenuated by
the 2 kX and 2 7 kX resistors to prevent the op-
amp from overloading the gain-control pin dur-
ing zero input conditions The 510 kX resistor
provides a pull-down current to the peak level
storage capacitor C1 to allow it to drift negative
when output amplitude reduces Thus the detec-
tor is of fast attack and slow decay design able to
reduce AGC gain rapidly when signal amplitude
suddenly increases and increases gain slowly
when the input drops out momentarily The val-
ue of C1 determines drop-out reaction rates and
the value of CF affects overall loop time constant
as well as the amount of ripple on the gain-con-
trol line C2 can be used to reduce this ripple fur-
ther although it contributes to loop overshoot
when input amplitude changes suddenly The op-
amp can be any inexpensive low-frequency type
The major problem with diode detectors is their
large and variable forward voltage They require
at least a 2 VP-P peak output signal to function
reliably and the forward voltage should be com-
pensated by including a negative VD added to
VREF Even this is only moderately successful
At the expense of bandwidth op-amp circuits can
greatly improve diode rectifiers (see ‘‘An Im-
proved Peak Detector’’ an Elantec application
note) Fortunately the detector will see a con-
stant amplitude of signal if the AGC is operating
correctly
A better-calibrated method is to use a four-quad-
rant multiplier as a square-law detector Here is a
circuit employing the EL4450
4452 – 26
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EL4452CN.PDF ] | |
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