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EL4421C Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL4421C
Beschreibung Multiplexed-Input Video Amplifiers
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 16 Seiten
EL4421C Datasheet, Funktion
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Features
 Unity or a 2-gain bandwidth of
80 MHz
 70 dB off-channel isolation at
4 MHz
 Directly drives high-impedance
or 75X loads
 02% and 02 differential gain
and phase errors
 8 ns switching time
 k100 mV switching glitch
 0 2% loaded gain error
 Compatible with g3V to g15V
supplies
 160 mW maximum dissipation at
g5V supplies
Ordering Information
Part No Temp Range Package Outline
EL4421CN b40 C to a85 C 8-Pin PDIP MDP0031
EL4421CS b40 C to a85 C 8-Pin SO MDP0027
EL4422CN b40 C to a85 C 8-Pin PDIP MDP0031
EL4422CS b40 C to a85 C 8-Pin SO MDP0027
EL4441CN b40 C to a85 C 14-Pin PDIP MDP0031
EL4441CS b40 C to a85 C 14-Pin SO MDP0027
EL4442CN b40 C to a85 C 14-Pin PDIP MDP0031
EL4442CS b40 C to a85 C 14-Pin SO MDP0027
EL4443CN b40 C to a85 C 14-Pin PDIP MDP0031
EL4443CS b40 C to a85 C 14-Pin SO MDP0027
EL4444CN b40 C to a85 C 14-Pin PDIP MDP0031
EL4444CS b40 C to a85 C 14-Pin SO MDP0027
General Description
The EL44XX family of video multiplexed-amplifiers offers a
very quick 8 ns switching time and low glitch along with very
low video distortion The amplifiers have good gain accuracy
even when driving low-impedance loads To save power the am-
plifiers do not require heavy loading to remain stable
The EL4421 and EL4422 are two-input multiplexed amplifiers
The -inputs of the input stages are wired together and the de-
vice can be used as a pin-compatible upgrade from the
MAX453
The EL4441 and EL4442 have four inputs also with common
feedback These may be used as upgrades of the MAX454
The EL4443 and EL4444 are also 4-input multiplexed amplifi-
ers but both positive and negative inputs are wired separately
A wide variety of gain- and phase-switching circuits can be built
using independent feedback paths for each channel
The EL4421 EL4441 and EL4443 are internally compensated
for unity-gain operation The EL4422 EL4442 and EL4444 are
compensated for gains of a2 or more especially useful for driv-
ing back-matched cables
The amplifiers have an operational temperature of b40 C to
a85 C and are packaged in plastic 8- and 14-pin DIP and 8- and
14-pin SO
The EL44XX multiplexed-amplifier family is fabricated with
Elantec’s proprietary complementary bipolar process which
gives excellent signal symmetry and is very rugged
Connection Diagrams
EL4421 EL4422
EL4441 EL4442
EL4443 EL4444
4421 – 1
Manufactured under U S Patent No 5 352 987
4421 – 2
4421 – 3
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






EL4421C Datasheet, Funktion
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves Contd
EL4421 EL4441 and EL4443
b3 dB Bandwidth Slewrate
and Peaking vs Supply Voltage
EL4422 EL4442 and EL4444
b3 dB Bandwidth Slewrate
and Peaking vs Supply Voltage
EL4421 EL4441 and EL4443
Bandwidth Slewrate and Peaking
vs Temperature AV e a1 RL e500X
4421 – 14
4421 – 15
EL4422 EL4442 and EL4444 Bandwidth
Slewrate and Peaking vs Temperature
AV e a2 RL e 150X RI e RG e 270X CF e 3 pF
EL4421 EL4441 and EL4443
b3 dB Bandwidth and Gain Error
vs Load Resistance
4421 – 16
Input Noise vs Frequency
4421 – 17
4421 – 18
6
4421 – 19

6 Page









EL4421C pdf, datenblatt
EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information Contd
behavior is assured In any event keeping signals
within guaranteed compliance limits will assure
freedom from overload problems
The input and output ranges are substantially
constant with temperature
Power Supplies
The mux-amps work well on any supplies from
g3V to g15V The supplies may be of different
voltages as long as the requirements of the Gnd
pin are observed (see the Switching Characteris-
tics section for a discussion) The supplies should
be bypassed close to the device with short leads
4 7 mF tantalum capacitors are very good and no
smaller bypasses need be placed in parallel Ca-
pacitors as small as 0 01 mF can be used if small
load currents flow
Single-polarity supplies such as a12V with
a5V can be used as described in the Switching
Characteristics section The inputs and outputs
will have to have their levels shifted above
ground to accommodate the lack of negative sup-
ply
The dissipation of the mux-amps increases with
power supply voltage and this must be compati-
ble with the package chosen This is a close esti-
mate for the dissipation of a circuit
PD e 2VScIs maxa(VS – VO)cVO RPAR
Where Is max is the maximum supply cur-
rent
VS is the g supply voltage (as-
sumed equal)
VO if the output voltage
RPAR is the parallel of all resistors
loading the output
The maximum dissipation a package support is
PD max e (TD max-TA max) RTH
Where TD max is the maximum die temper-
ature 150 C for reliability less to re-
tain optimum electrical performance
TA max is the ambient temperature
70 for commercial and 85 C for indus-
trial range
RTH is the thermal resistance of the
mounted package obtained from data
sheet dissipation curves
The most difficult case is the SO-8 package With
a maximum die temperature of 150 C and a maxi-
mum ambient temperature of 85 the 65 temper-
ature rise and package thermal resistance of
170 W gives a maximum dissipation of 382 mW
This allows a maximum supply voltage of g9 2V
for the EL4422 operated in our example If the
xEL4421 were driving a light load (RPAR %)
it could operate on g15V supplies at a 70 maxi-
mum ambient
The EL4441 through EL4444 can operate on
g12V supplies in the SO package and all parts
can be powered by g15V supplies in DIP pack-
ages
Output Loading
The output stage of the mux-amp is very power-
ful and can source 80 mA and sink 120 mA Of
course this is too much current to sustain and
the part will eventually be destroyed by excessive
dissipation or by metal traces on the die opening
The metal traces are completely reliable while de-
livering the 30 mA continuous output given in
the Absolute Maximum Ratings table in this
data sheet or higher purely transient currents
For instance the EL4422 draws a maximum of
14 mA and we might require a 2V peak output
into 150X and a 270X a270X feedback divider
The RPAR is 117X The dissipation with g5V
supplies is 191 mW The maximum Supply volt-
age that the device can run on for a given PD and
the other parameter is
Gain or gain accuracy degrades only 10% from
no load to 100X load Heavy resistive loading will
degrade frequency response and video distortion
only a bit becoming noticeably worse for loads
k 100X
VS maxe(PDaVO2 RPAR) 2IsaVO RPAR)
12

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