EL4089C Elantec Semiconductor, Inc. (acquired by Intersil), EL4089C Datasheet

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EL4089C

Manufacturer Part Number
EL4089C
Description
Dc-restored Video Amplifier
Manufacturer
Elantec Semiconductor, Inc. (acquired by Intersil)
Datasheet

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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
1993 Elantec Inc
Features
Applications
Ordering Information
Part No
EL4089CN 0 C to
EL4089CS
Complete video level restoration
system
0 02% differential gain and 0 05
differential phase accuracy at
NTSC
60 MHz bandwidth
0 1 dB flatness to 10 MHz
V
TTL CMOS hold signal
Input amplifier in video
equipment
Restoration amplifier in video
mixers
S
e
g
Temp Range
0 C to
5V to
a
a
75 C
75 C
g
15V
8-Pin P-DIP MDP0031
8-Lead SO
Package
Outline
MDP0027
EL4089C
DC Restored Video Amplifier
General Description
The EL4089C is an 8-pin complete DC-restored monolithic vid-
eo amplifier sub-system It contains a high quality video ampli-
fier and a nulling sample-and-hold amplifier specifically de-
signed to stabilize video performance
When the HOLD logic input is set to a TTL CMOS logic 0 the
sample- and-hold amplifier can be used to null the DC offset of
the video amplifer
When the HOLD input goes to a TTL CMOS logic l the cor-
recting voltage is stored on the video amplifier’s input coupling
capacitor The correction voltage can be further corrected as
need be on each video line
The video amplifier is optimized for video performance and low
power Its current feedback design allows the user to maintain
essentially the same bandwidth over a gain range of nearly 10 1
The amplifier drives back-terminated 75
The EL4089C is fabricated in Elantec’s proprietary Comple-
mentary Bipolar process which produces NPN and PNP tran-
sistors with equivalent AC and DC performance The EL4089C
is specified for operation over 0 C to
Connection Diagram
DC restoring amplifier with a gain of 2 restoring to ground
a
75 C temperature range
lines
4089 – 1

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EL4089C Summary of contents

Page 1

... Elantec Inc EL4089C DC Restored Video Amplifier General Description The EL4089C is an 8-pin complete DC-restored monolithic vid- eo amplifier sub-system It contains a high quality video ampli- fier and a nulling sample-and-hold amplifier specifically de- signed to stabilize video performance When the HOLD logic input is set to a TTL CMOS logic 0 the ...

Page 2

... EL4089C DC Restored Video Amplifier Absolute Maximum Ratings Voltage between V and Voltage between and GND pins Current OUT Current into V and HOLD Pins IN b Internal Power Dissipation Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually ...

Page 3

... Note 6 DC offset from 0 714V through 0 714V ac amplitude is 286 mVp-p equivalent to 40 ire b a Note 7 Test fixture was designed to minimize capacitance at the IN capacitance to ground at this very sensitive pin See application notes for further details EL4089C DC Restored Video Amplifier Contd 25 C Temp Min Typ ...

Page 4

... EL4089C DC Restored Video Amplifier Typical Performance Curves Supply Current vs Temperature V 15V Restoring Current vs Temperature Amplifier Output Voltage vs Die Temperature V 15V Supply Current vs Supply Voltage 4089 – 2 Amplifier Input Current vs Die Temperature 4089 – 4 Amplifier Offset Voltage vs Die Temperature 4089 – 4089 – ...

Page 5

... DC Restored Video Amplifier Contd Transimpedance (R vs Die Temperature 4089 – 8 Frequency Response vs Supply 4089 – 10 Frequency Response Flatness for Various Load and Supply Conditions 300 4089 – EL4089C ) OL 4089 – 9 300 4089 – 11 4089 – 13 ...

Page 6

... EL4089C DC Restored Video Amplifier Typical Performance Curves Frequency Response Flatness 300 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature Contd Differential Gain vs DC Input Offset A R 150 e L 4089 – 14 Differential Phase vs DC Input Offset ...

Page 7

... Using a smaller value of CX1 increases both the voltage that can be corrected and the drift while being held likewise using a larger value of CX1 reduces the voltages EL4089C DC Restored Video Amplifier The RX1 resistor is in the circuit purely to simu- late some external source impedance and is not ...

Page 8

... EL4089C DC Restored Video Amplifier Table of Charge Storage Capacitor vs Droop Charging Rates Cap Value Droop 100 Basic formulae are V (droop) Ib (Line time e a and V (charge) I Sample time e OUT For best results the source impedance should be kept low using a buffer for example ...

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