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EL2082C Schematic ( PDF Datasheet ) - Elantec

Teilenummer EL2082C
Beschreibung Current-Mode Multiplier
Hersteller Elantec
Logo Elantec Logo 




Gesamt 16 Seiten
EL2082C Datasheet, Funktion
EL2082C
Current-Mode Multiplier
Features
 Flexible inputs and outputs all
ground referred
 150 MHz large and small-signal
bandwidth
 46 dB of calibrated gain control
range
 70 dB isolation in disable mode
10 MHz
 0 15% diff gain and 0 05 diff
phase performance at NTSC
using application circuit
 Operates on g5V to g15V power
supplies
 Outputs may be paralleled to
function as a multiplexer
Applications
 Level adjust for video signals
 Video faders and mixers
 Signal routing multiplexers
 Variable active filters
 Video monitor contrast control
 AGC
 Receiver IF gain control
 Modulation demodulation
 General ‘‘cold’’ front-panel
control of AC signals
Ordering Information
Part No Temp Range Package Outline
EL2082CN 0 C to a75 C 8-Pin P-DIP MDP0031
EL2082CS 0 C to a75 C 8-Pin SO
MDP0027
General Description
The EL2082 is a general purpose variable gain control building
block built using an advanced proprietary complementary bi-
polar process It is a two-quandrant multiplier so that zero or
negative control voltages do not allow signal feedthrough and
very high attenuation is possible The EL2082 works in current
mode rather than voltage mode so that the input impedance is
low and the output impedance is high This allows very wide
bandwidth for both large and small signals
The IIN pin replicates the voltage present on the VIN pin there-
fore the VIN pin can be used to reject common-mode noise and
establish an input ground reference The gain control input is
calibrated to 1 mA mA signal gain for 1V of control voltage
The disable pin (E) is TTL-compatible and the output current
can comply with a wide range of output voltages
Because current signals rather than voltages are employed mul-
tiple inputs can be summed and many outputs wire-or’ed or
mixed
The EL2082 operates from a wide range of supplies and is avail-
able in standard 8-pin plastic DIP or 8-lead SO
Connection Diagram
8-Pin DIP SO
Top View
2082 – 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
1992 Elantec Inc






EL2082C Datasheet, Funktion
EL2082C
Current-Mode Multiplier
Typical Performance Curves Contd
Current Gain vs
Supply Voltage
Current Gain vs
Temperature
Output Capacitance vs
Output Voltage
Enable Pin Response
2082 – 7
Supply Current vs
Supply Voltage
2082 – 8
Supply Current vs
Die Temperature
2082 – 9
2082 – 10
6

6 Page









EL2082C pdf, datenblatt
EL2082C
Current-Mode Multiplier
Applications Information Contd
The IIN pin of the EL2082 looks like 95X well past 100 MHz and the output looks like a simple
current-source in parallel with about 5 pF There is no particular problem with any resistance or
reactance connected to IIN or IOUT The mixer output is generally sent to a crystal filter which
required a few hundred ohm terminating impedance The impedance of the IIN pin of the first EL2082
is transformed to about 400X by the 2 1 transformer T1 The two EL2082’s are used as variable-gain IF
amplifiers with small gains offered by each The output of the first EL2082 is coupled to the second by
the resonant matching network L1 – C1 For a Q of 5 Xc1 e x11 e 5 c 95X approximately The
impedance seen at the first EL2082’s IOUT will be about Q2 c 95X or 2 5k and by impedance transfor-
mation alone the first gain cell delivers 28 dB of gain at Vg e 1V More gain cells can be used for a
wider range of (calibrated) AGC compliance
The E input can be used as a high-speed noise blanker gate
Linearized Fader Gain Control
The following circuit is an example of placing two EL2082’s in the feedback network of an op-amp to
significantly reduce their distortions
Linearized Gain Control Fader
Dual EL2082 Fader with EL2030
NTSC Differential Gain Error
VOUT e K  VA
a(1bK)  VB
where O s K s 1
2082 – 20
Dual EL2082 Fader with EL2030
NTSC Differential Phase Error
2082 – 21
12
2082 – 22

12 Page





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