EL2090CM Elantec Inc, EL2090CM Datasheet

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EL2090CM

Manufacturer Part Number
EL2090CM
Description
100MHz DC-restored video amplifier
Manufacturer
Elantec Inc
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 Patent pending
1990 Elantec Inc
Features
Applications
Ordering Information
EL2090CN 0 C to
EL2090CM 0 C to
Part No Temp Range
Complete video level restoration
system
0 01% differential gain and 0 02
differential phase accuracy at
NTSC
100 MHz bandwidth
0 1 dB flatness to 20 MHz
Sample-and-hold has 15 nA
typical leakage and 1 5 pC charge
injection
System can acquire DC
correction level in 10 s or 5 scan
lines of 2 s each to
V
TTL CMOS hold signal
Input amplifier in video
equipment
Restoration amplifier in video
mixers
S
e
g
5V to
a
a
75 C 14-Pin P-DIP MDP0031
75 C 16-Lead SOL MDP0027
g
15V
Pkg
IRE
Outline
EL2090C
100 MHz DC-Restored Video Amplifier
General Description
The EL2090C is the first complete DC-restored monolithic vid-
eo amplifier sub-system It contains a very high-quality video
amplifier and a nulling sample-and-hold amplifier specifically
designed to stabilize video performance When the HOLD logic
input is set to a logic 0 during a horizontal sync the sample-
and-hold amplifier may be used as a general-purpose op-amp to
null the DC offset of the video amplifier When the HOLD in-
put goes to a logic 1 the sample-and-hold stores the correction
voltage on the hold capacitor to maintain DC correction during
the subsequent scan line
The video amplifier is optimized for video characteristics and
performance at NTSC is nearly perfect It is a current-feedback
amplifier so that
closed-loop gains The amplifier easily drives video signal levels
into 75
useful in HDTV applications
The sample-and-hold is optimized for fast sync pulse response
The application circuit shown will restore the video DC level in
five scan lines even if the HOLD pulse is only 2 s long The
output impedance of the sample-and-hold is low and constant
over frequency and load current so that the performance of the
video amplifier is not compromised by connections to the DC
restore circuitry
The EL2090C is fabricated in Elantec’s proprietary Comple-
mentary Bipolar process which produces NPN and PNP tran-
sistors with equivalent AC and DC performance The EL2090C
is specified for operation over the 0 C to 75 C temperature
range
Connection Diagrams
14-Pin DIP Package
loads With 100 MHz bandwidth the EL2090 is also
b
3 dB bandwidth changes little at various
2090 – 1
16-Pin SOL Package
CMS 2090DS
2090 – 2

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EL2090CM Summary of contents

Page 1

... EL2090CN 14-Pin P-DIP MDP0031 a EL2090CM 16-Lead SOL MDP0027 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

EL2090C 100 MHz DC-Restored Video Amplifier Absolute Maximum Ratings Voltage between V and Voltage between and GND pins (V IN HOLD Current OUT ...

Page 3

Open Loop DC Electrical Characteristics V 15V R 150 unless otherwise specified Parameter Description Contd Sample-And-Hold Section A Large Signal Voltage Gain VOL CMRR Common-Mode Rejection Ratio V 11V e ...

Page 4

EL2090C 100 MHz DC-Restored Video Amplifier Figure 1 Typical Application (A Typical Performance Curves Relative Frequency Response for Various Gains Frequency Response Flatness for Various Load and Supply Conditions Frequency Response with Different Loads (A e ...

Page 5

Typical Performance Curves Differential Gain and Phase vs Supply Voltage 150 V from Differential Gain vs DC Input Offset MHz R e ...

Page 6

EL2090C 100 MHz DC-Restored Video Amplifier Typical Performance Curves Sample-to-Hold Change Injection vs Temperature Supply Current vs Supply Voltage Contd S H Available Charge Current vs Temperature 2090 – 7 Typical Droop Current vs Temperature V Supply Current vs Temperature ...

Page 7

Typical Performance Curves Maximum Power Dissipation vs Ambient Temperature 14-Pin PDIP and 16-Pin SOL Applications Information The EL2090C is a general purpose component and thus the video amplifier and sample-and- hold pins are uncommitted Therefore much of the ultimate performance ...

Page 8

EL2090C 100 MHz DC-Restored Video Amplifier Applications Information The HOLD input to the sample-and-hold has threshold and is clamped to a diode below ground and 6V above ground The hold step char- acteristics are not sensitive to ...

Page 9

Applications Information a saturation voltage we prevent this node from approaching the positive rail The maximum voltage is set by the resistive voltage divider (be- tween V and GND) R1 and R2 plus a diode a This value can be ...

Page 10

EL2090C 100 MHz DC-Restored Video Amplifier EL2090 Macromodel Revision A October 1992 param vclamp 0 002 (TEMP 25 Connections Vidin a l Vidin Vsupply Vsupply ...

Page 11

EL2090 Macromodel Contd 100 MHz DC-Restored Video Amplifier Sample and Hold Amplifier 11 EL2090C 2090 – 15 ...

Page 12

... Contd 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 time without notice Elantec Inc assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement ...

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