EL4089C

DC Restored Video Amplifier

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

 Complete video level restoration

system

 002% differential gain and 005

differential phase accuracy at

NTSC

 60 MHz bandwidth

 01 dB flatness to 10 MHz

 TTLCMOS hold signal

Applications

 Input amplifier in video

equipment

 Restoration amplifier in video

mixers

Ordering Information

Part No

Temp Range

Package

Outline

EL4089CN

8-Pin P-DIP

MDP0031

EL4089CS

8-Lead SO

MDP0027

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 TTLCMOS 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 TTLCMOS 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 101

The amplifier drives back-terminated 75

X lines

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

Connection Diagram

4089 – 1

DC restoring amplifier with a gain of 2 restoring to ground