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Zetex Semiconductors - VIDEO AMPLIFIER WITH DC RESTORATION

Numéro de référence ZXFV4089
Description VIDEO AMPLIFIER WITH DC RESTORATION
Fabricant Zetex Semiconductors 
Logo Zetex Semiconductors 





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ZXFV4089 fiche technique
VIDEO AMPLIFIER WITH DC RESTORATION
ZXFV4089
DEVICE DESCRIPTION
The ZXFV4089 is a DC restoring circuit and
low-distortion video amplifier. It is specially designed
to provide brightness level stability as a ‘black-level
clamp’ in video systems with very low distortion and
low power consumption.
A high fidelity video amplifier is combined with a
sample-hold switch circuit using an external coupling
capacitor to provide level-shifting of the video output
such that a time-gated sample 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.
The gain is set externally by two resistors.
In a typical application, the sample-hold circuit is gated
on during part of the back-porch interval of an analog
video waveform. Then the video waveform is
stabilised for the remainder of the line-scan interval.
FEATURES AND BENEFITS
Various TV systems, PAL, NTSC, SECAM
Buffered output using high quality video amplifier
Gain is set using two external resistors
On chip sample/hold capacitor
300 MHz bandwidth
0.02% differential gain
0.02° differential phase
+/-5V supply operation
8 mA supply current
Pin and function compatible with industry
standard part
ORDERING INFORMATION
Part Number
Container
ZXFV4089N8TA
Reel 7
ZXFV4089N8TC
Reel 13
Increment
500
2500
CONNECTION DIAGRAM
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
ADVANCED INFORMATION ISSUE D - SEPTEMBER 2002
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