ZXFV4089 Datasheet, PDF (1/12 Pages) Zetex Semiconductors – VIDEO AMPLIFIER WITH DC RESTORATION

A Product Line of
Diodes Incorporated
ZXFV4089
Video amplifier with DC restoration
Description
The ZXFV4089 is a DC restored video
amplifier (black-level clamp) in an 8 pin SOIC
package. It integrates a high performance
video amplifier with a nulling sample and
hold amplifier specially designed to provide
brightness level stability.
The input video signal is AC coupled to the
main amplifier and this AC coupling capacitor
also acts as the holding capacitor for the
sample and hold amplifier. This configuration
reduces both pin count and external
components over traditional solutions.
Typically, during the back-porch interval of an
analog video waveform the sample and hold
amplifier forces the input of the video
amplifier to the reference voltage.
Features
• Complete analog video DC level
restoration system
• Supports various TV systems
• PAL, NTSC, SECAM
• Excellent video performance
• 0.08% differential gain
• 0.1° differential phase
• 30 MHz 0.1 dB bandwidth
• 210 MHz -3 dB bandwidth
• 400V/ms slewrate
• TTL/CMOS logic compatible HOLD input
• Pin and function compatible with industry
standard EL4089
The video waveform is now referenced to the
new reference voltage for the remainder of the
line-scan interval.
The video amplifier has been optimised for
video applications and as such drives back-
terminated 75⍀ loads with good differential
gain and phase errors. The current feedback
architecture allows the bandwidth to remain
fixed over a wide range of gains, and is set by
two external resistors.
The ZXFV4089 is specified for operation at ±5V
and over the -40°C to +85°C temperature range
and is pin compatible with the industry standard
EL4089.
Applications
• Black level clamp, providing stable intensity
in video systems such as:
• cameras
• image capture
• video mixing
• displays
• DC restoration of other high frequency
signals
Ordering information
Part number
Reel size Quantity
(inches) per reel
ZXFV4089N8TA
7
500
ZXFV4089N8TC 13
2500
Device
marking
4089
4089
Issue 4 - December 2008
1
© Diodes Incorporated 2008
Figure 1 Pin connection diagram
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