
DEVICE DESCRIPTION
The ZXFV401 provides the ability to separate out video
synchronisation signals for a wide variety of TV and CRT
display systems, standard and non-standard.
Flexibility arises from the use of just three external
resistors to adapt to each application. One resistor
controls a fully integrated internal colour carrier filter
with variable bandwidth. This filter aviods disturbance
from the colour carrier, permitting accurate threshold
slicing for timing extraction.
A second resistor controls the voltage threshold for
loss of signal detection after a time-out interval. The
third resistor controls the timing functions.
DC restoration for displays is facilitated by the Back
Porch synch output, which can be used to drive an
externalcurcuittoclamptheblankingvoltagetoafixed
level.
FEATURES AND BENEFITS
PAL, NTSC, SECAM, other TV systems
Super accurate synch slice
Variable filter for outputs: composite, horizontal,
Vertical, back porch, odd / even
No-signal detector
On chip sample / hold capacitors
+5V single supply
4.5 mA supply current
Default vertical output where there are no
serration pulses
Pin compatible with industry standard part SO16N
surface mount package
APPLICATIONS
Digital image capture
Video input systems requiring separation of
picture timing
Video distribution
CCTV surveillance
Digital multimedia
Timing for black level clamp
ZXFV401
PROVISIONAL ISSUE A - FEBRUARY 2002
1
SYNC SEPARATOR WITH VARIABLE FILTER
ORDERING INFORMATION
Part Number
Container
Increment
ZXFV401N16TA
Reel 7
″
Reel 13
″
500
ZXFV401N16TC
2500
3
1
2
4
5
6
7
8
9
10
11
12
13
14
15
16
ZXFV401N16
RFILT
RNOSIG
CSYNC
FILTIN
VSYNC
0VD
FILTOUT
FVIDIN
VLEV
NOSIG
BKPCH
RSET
ODDFLD
V+
HSYNC
0VA
+5V
C1
0.1uF
C2
0.1uF
RFILT
RNOSIG
COMPOSITE SYNC
HORIZONTAL SYNC
ODD FIELD
BACK PORCH
NO SIGNAL
SYNC TIP VOLTAGE
VERTICAL SYNC
RSET
VIDEO INPUT
75R
CONNECTION DIAGRAM