EL4095CN ELANTEC [Elantec Semiconductor], EL4095CN Datasheet

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EL4095CN

Manufacturer Part Number
EL4095CN
Description
Video Gain Control/Fader/Multiplexer
Manufacturer
ELANTEC [Elantec Semiconductor]
Datasheet
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
Features
Applications
Ordering Information
Part No
EL4095CN
EL4095CS
Full function video fader
0 02% 0 02 differential gain
phase
25 ns multiplexer included
Output amplifier included
Calibrated linear gain control
60 MHz bandwidth
Low thermal errors
Video faders wipers
Gain control
Graphics overlay
Video text insertion
Level adjust
Modulation
g
5V to
b
b
Temp Range
40 C to
40 C to
g
100% gain
15V operation
a
a
85 C 14 Pin P-DIP MDP0031
85 C SO-14
Package
Outline
MDP0027
EL4095C
Video Gain Control Fader Multiplexer
General Description
The EL4095C is a versatile variable-gain building block At its
core is a fader which can variably blend two inputs together and
an output amplifier that can drive heavy loads Each input ap-
pears as the input of a current-feedback amplifier and with ex-
ternal resistors can separately provide any gain desired The
output is defined as
V
where A and B are the fed-back gains of each channel
Additionally two logic inputs are provided which each override
the analog V
and 0% for the other The logic inputs switch in only 25 ns and
provide high attenuation to the off channel while generating
very small glitches
Signal bandwidth is 60 MHz and gain-control bandwidth
20 MHz The gain control recovers from overdrive in only
70 ns
The EL4095C operates from
is available in both 14-pin DIP and narrow surface mount pack-
ages
Connection Diagram
Manufactured under U S Patent No 5 321 371 5 374 898
OUT
e
A V
GAIN
INA
(0 5V
control and force 100% gain for one input
14-Pin DIP SO
a
Top View
V
g
GAIN
5V to
)
a
g
15V power supplies and
B V
INB
(0 5V –V
GAIN
4095 – 1
)

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EL4095CN Summary of contents

Page 1

... Video faders wipers Gain control Graphics overlay Video text insertion Level adjust Modulation Ordering Information Part No Temp Range Package Outline EL4095CN Pin P-DIP MDP0031 b a EL4095CS SO-14 MDP0027 b a 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 ...

Page 2

EL4095C Video Gain Control Fader Multiplexer Absolute Maximum Ratings V Supply Voltage Voltage between V and Input Voltage (V a INA INB I Current Into V ...

Page 3

Open Loop DC Electrical Characteristics V 15V unless otherwise specified Parameter Description Feedthrough Feedthrough of Deselected Input to Output Forced Deselected Input at 100% Gain Control V 100% Minimum Voltage at GAIN ...

Page 4

EL4095C Video Gain Control Fader Multiplexer Typical Performance Curves Large-Signal Pulse Response Gain e a Small-Signal Pulse Response for Various Gains Frequency Response with Different Values of R Gain Response Gain 4095 – 6 4095 ...

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Typical Performance Curves Frequency Response with Different Gains Frequency Response with Various Values of Parasitic C IN Change in Bandwidth and Slewrate with Supply Voltage Gain b Video Gain Control Fader Multiplexer Contd Frequency Response with Various Load Capacitances and ...

Page 6

EL4095C Video Gain Control Fader Multiplexer Typical Performance Curves Change in Bandwidth and Slewrate with Temperature Gain b DC Nonlinearity vs Input Voltage Gain Differential Gain and Phase Errors vs Gain Control Setting b Contd Change ...

Page 7

Typical Performance Curves Differential Phase Error vs DC Offset Gain Differential Phase Error vs DC Offset Gain Attenuation over Frequency Gain Video Gain Control Fader Multiplexer Contd Differential Phase Error vs ...

Page 8

EL4095C Video Gain Control Fader Multiplexer Typical Performance Curves Gain Gain Control Response to a Non-Overloading Step Constant Sinewave Overload Recovery GAIN Response No AC Input Contd Gain Control ...

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Typical Performance Curves Change in V and 100 Gain Control 0% vs Supply Voltage Force Response Supply Current vs Supply Voltage Video Gain Control Fader Multiplexer Contd Change in V and 100 Gain Control 0% vs ...

Page 10

EL4095C Video Gain Control Fader Multiplexer Test Circuit 4095 – 26 ...

Page 11

Applications Information The EL4095 is a general-purpose two-channel fader whose input channels each act as a current- feedback amplifier (CFA) input Each input can have its own gain factor as established by exter- nal resistors For instance the Test Circuit ...

Page 12

EL4095C Video Gain Control Fader Multiplexer Applications Information Stray capacitance at each V terminal should b IN absolutely be minimized especially in a positive- gain mode or peaking will occur Similarly the load capacitance should be minimized If more than ...

Page 13

Applications Information In fact the gain control internal circuitry is very complex Here is a representation of the termi- nals Representation of Gain Control Inputs V and For gain control inputs between ( 90 A) the diode ...

Page 14

EL4095C Video Gain Control Fader Multiplexer Application Information Here the A input channel is configured for a gain of 2 and the B channel for a gain of a its input attenuated by The connection is vir- tuous because the ...

Page 15

Application Information to produce a standard video output The V of the A side is a buffer output that repro duces the input signal and drives R Into the two resistors error current flows ...

Page 16

EL4095C Video Gain Control Fader Multiplexer Application Information Although another amplifier is needed to gain the output back to standard level the reduced error currents bring the differential phase error to less than 0 1 over the entire input range ...

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Application Information The A channel gains the input by channel by 1 Feedthrough suppression of the b Y input can be optimized by introducing an off- set between channel A and B This is easily done by injecting an adjustable ...

Page 18

EL4095C Video Gain Control Fader Multiplexer Applications Information The EL4095 is connected as a unity-gain fader with an LRC peaking network connected to the A-input and an RC rolloff network connected to the B-input The plot shows the range of ...

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EL4095C Macromodel Video Gain Control Fader Multiplexer Contd 19 EL4095C 4095 – 36 ...

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EL4095C Video Gain Control Fader Multiplexer EL4095C Macromodel Contd 20 4095 – 37 ...

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EL4095C Macromodel The EL4095 Macromodel Schematic Video Gain Control Fader Multiplexer Contd 21 EL4095C 4095 – 38 ...

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EL4095C Video Gain Control Fader Multiplexer EL4095C Macromodel Contd 22 4095 – 39 ...

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23 ...

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EL4095C Video Gain Control Fader Multiplexer 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 ...

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