Zetex ZXFV401N16TA, ZXFV401N16TC Datasheet

SYNC SEPARATOR WITH VARIABLE FILTER

ZXFV401

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 external curcuit to clamp the blanking voltagetoafixed level.

ORDERING INFORMATION

Part Number Container Increment

ZXFV401N16TA ZXFV401N16TC

Reel 7″

Reel 13″

CONNECTION DIAGRAM

500 2500

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

VIDEO INPUT

0.1uF

75R

0.1uF

PROVISIONAL ISSUE A - FEBRUARY 2002

RFILT

RNOSIG

CSYNC

FILTIN

VSYNC

0VD

FILTOUT

8 9

FVIDIN VLEV

ZXFV401N16

0VA

HSYNC

V+

ODDFLD

RSET

BKPCH

NOSIG

+5V

COMPOSITE SYNC

RSET

HORIZONTAL SYNC

ODD FIELD

BACK PORCH

NO SIGNAL

SYNC TIP VOLTAGE

VERTICAL SYNC

ZXFV401

ABSOLUTE MAXIMUM RATINGS

Supply voltage V Inputs to ground* -0.5V to VCC+0.5V

Operating Temperature Range -40⬚C to 85⬚C Storage -65⬚C to +150⬚C

Operating Ambient Junction temperature T **The thermal resistance from the semiconductor die to ambient is typically120⬚C/W when the SO16 package is

mounted on a PCB in free air. The power dissipation of the device when loaded must be designed to keep the device junction temperature below T

*During power-up and power-down, these voltage ratings require that signals be applied only when the power supply is connected.

JMAX.

ELECTRICAL CHARACTERISTICS

= 4.75 TO 5.25, R

PARAMETER CONDITIONS TEST MIN TYP MAX UNIT DC Characteristics

Supply current P 4.5 mA Clamp voltage Pin 4 unloaded P 1.3 1.35 1.8 V Discharge current at FILTIN Pin 4, Vin = 2V pk-pk C 1 ␮A Discharge current at FILTIN Pin 4, no signal P 3 6 12 ␮A Clamp charge current at FILTIN Pin 4, Vin = 1V pk-pk P 2 3 4 mA Clamp voltage at FVIDIN Pin 8 unloaded P 1.3 1.35 1.8 V Discharge current at FVIDIN Pin 8, Vin = 2V pk-pk C 1 ␮〈 Discharge current at FVIDIN Pin 8, no signal P 3 6 12 ␮〈 Clamp charge current at FVIDIN Pin 8, Vin = 1V pk-pk P 2 3 4 mA

voltage, pin 12

SET

voltage, pin 1

FILT

RNOSIG current, pin 2 P 1.5 2.5 3.5 ␮A Logic output Low voltage, V Logic output High voltage, V

SET

= 681k, R

FILT

-0.5V to +7V

150⬚C**

JMAX

= 22k, R

IOL= 1.6mA IOH= 1.6mA

NOSIG

= 82k, T

=25⬚Cunless otherwise stated.

amb

P 1.5 1.75 2 V P 0.35 0.5 0.65 V

P 0.35 0.8 V P2.44 V

TEST - P = production tested, C = characterised

PROVISIONAL ISSUE A - FEBRUARY 2002

ZXFV401

ELECTRICAL CHARACTERISTICS (CONT) VCC = 4.75 TO 5.25, R

PARAMETER CONDITIONS TEST MIN TYP MAX UNIT AC Characteristics

FILTIN function input voltage range PAL/NTSC P 0.4 2 V pk-pk Filter voltage gain FILTIN to FILOUT P 6 dB Filter attenuation 4.4MHz for PAL,

Slice level Vin = 1V pk-pk P 40 50 60 % CSYNC prop. Delay, t VSYNC delay P 250 ns VSYNC pulse width, t VSYNC pulse width, t VSYNC default delay, t HSYNC delay P 250 ns HSYNC pulse width, t BKPCH delay, t BKPCH pulse width, t VLEV output Input 1 Vpk-pk, pin 4 P 500 600 700 mV NOSIG time-out delay after loss of signal P 600 ␮s

VSYNC VSYNC

SET

VSD

HSYNC

= 681k, R

(PAL) (NTSC)

= 22k, Tamb = 25 C unless otherwise stated.

FILT

3.6MHz for NTSC

Relative to pin 4 input

C12 dB

P 250 400 ns

P 165 ␮ s P 195 ␮s P273645 ␮s

P 3.8 5 6.2 ␮s P 250 400 ns P 2.7 3.7 4.7 ␮s

TEST - P = production tested, C = characterised

PROVISIONAL ISSUE A - FEBRUARY 2002

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