ZXFV4089
VIDEO AMPLIFIER WITH DC RESTORATION
DEVICE DESCRIPTION
FEATURES AND BENEFITS
Th e ZXFV4 0 8 9 is
a DC r e s t o r in g c ir c u it a n d
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Various TV system s, PAL, NTSC, SECAM
low-distortion video am plifier. It is specially designed
to provide brightness level stability as a ‘black-level
clam p’ in video system s with very low distortion and
low power consum ption.
Buffered output using high quality video am plifier
Gain is set using two external resistors
On chip sam ple/hold capacitor
300 MHz bandwidth
A high fidelity video am plifier is com bined with a
sam ple-hold switch circuit using an external coupling
capacitor to provide level-shifting of the video output
such that a tim e-gated sam ple of the waveform is set to
be equal to an external reference voltage (usually zero
voltage). A buffered TTL/CMOS logic input signal
controls the switch.
0.02% differential gain
0.02° differential phase
The gain is set externally by two resistors.
+/-5V supply operation
In a typical application, the sam ple-hold circuit is gated
on during part of the back-porch interval of an analog
vid e o w a ve fo rm . Th e n th e vid e o w a ve fo rm is
stabilised for the rem ainder of the line-scan interval.
8 m A supply current
Pin and function com patible with industry
standard part
APPLICATIONS
ORDERING INFORMATION
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Black Level Clam p, providing stable intensity in
video system s such as
cam eras
ZXFV4089N8TA
ZXFV4089N8TC
500
Re e l 7″
im age capture
video m ixing
displays
Re e l 13″
2500
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DC restoration of other high frequency signals
CONNECTION DIAGRAM
ADVANCED INFORMATION ISSUE D - SEPTEMBER 2002
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