ZXFV4089_05 Datasheet, PDF (1/9 Pages) Zetex Semiconductors – VIDEO AMPLIFIER WITH DC RESTORATION

VIDEO AMPLIFIER WITH DC RESTORATION
ZXFV4089
DEVICE DESCRIPTION
The ZXFV4089 is a DC restored video amplifier
(black-level clamp) in an 8pin SOIC package. It
integrates a high performance video amplifier with a
nulling sample and hold amplifier specially designed to
provide brightness level stability.
FEATURES AND BENEFITS
• Complete analog video dc level restoration system
• Supports various TV systems
• PAL, NTSC, SECAM
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.
• Excellent video performance
• 0.08% differential gain
• 0.1° differential phase
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. The
video waveform is now referenced to the new reference
voltage for the remainder of the line-scan interval.
• 30 MHz 0.1 dB bandwidth
• 210 MHz -3 dB bandwidth
• 400V/␮s slewrate
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.
• TTL/CMOS logic compatible HOLD input
• Pin and function compatible with industry
standard EL4089
APPLICATIONS
• Black Level Clamp, providing stable intensity in
video systems such as:
• cameras
ORDERING INFORMATION
• image capture
Part Number
Container Increment Part mark
• video mixing
ZXFV4089N8TA
Reel 7" 500
ZXFV4089
• displays
ZXFV4089N8TC Reel 13" 2500
ZXFV4089
• DC restoration of other high frequency signals
CONNECTION DIAGRAM
ISSUE 2 - SEPTEMBER 2005
1
SEMICONDUCTORS