ZXFV4089 Datasheet, PDF (1/5 Pages) Zetex Semiconductors – VIDEO AMPLIFIER WITH DC RESTORATION

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
1