PDF EL4581C Data sheet ( Hoja de datos )

Número de pieza	EL4581C
Descripción	Sync Separator/ 50% Slice/ S-H/ Filter
Fabricantes	Elantec Semiconductor
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No Preview Available ! EL4581C Sync Separator 50% Slice S-H Filter Features NTSC PAL and SECAM sync separation Single supply a5V Precision 50% slicing internal caps Built-in color burst filter Decodes non-standard verticals Pin compatible with LM1881 Low power Typically 1 5 mA supply current Resistor programmable scan rate Few external components Available in 8-pin DIP and SO-8 pkg Applications Video special effects Video test equipment Video distribution Displays Imaging Video data capture Video triggers Ordering Information Part No Temp Range Package Outline EL4581CN b40 C to a85 C 8-Pin DIP MDP0031 EL4581CS b40 C to a85 C 8-Lead SO MDP0027 Demo Board A dedicated demo board is not available However this device can be placed on the EL4584 5 Demo Board General Description The EL4581C extracts timing information from standard nega- tive going video sync found in NTSC PAL and SECAM broad- cast systems It can also be used in non standard formats and with computer graphics systems at higher scan rates by adjust- ing a single external resistor When the input does not have correct serration pulses in the vertical interval a default verti- cal output is produced Outputs are composite sync vertical sync burst back porch output and odd even output The later operates only in inter- laced scan formats The EL4581C provides a reliable method of determining correct sync slide level by setting it to the mid-point between sync tip and blanking level at the back porch This 50% level is deter- mined by two internal self timing sample and hold circuits that track sync tip and back porch levels This also provides a degree of hum and noise rejection to the input signal and compensates for varying input levels of 0 5 p-p to 2 0 Vp-p A built in linear phase third order low pass filter attenuates the chroma signal in color systems to prevent incorrectly set color burst from disturbing the 50% sync slide This device may be used to replace the industry standard LM1881 offering improved performance and reduced power consumption The EL4581C video sync separator is manufactured using Elantec’s high performance analog CMOS process Connection Diagram EL4581C SO P-DIP Packages Top View 4581 – 1 Manufactured under U S Patent No 5 528 303 Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ‘‘controlled document’’ Current revisions if any to these specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation 1993 Elantec Inc 1 page Timing Diagrams EL4581C Sync Separator 50% Slice S-H Filter 4581 – 3 Figure 1 Notes b The composite sync output reproduces all the video input sync pulses with a propagation delay c Vertical sync leading edge is coincident with the first vertical serration pulse leading edge with a propagation delay d Odd-even output is low for even field and high for odd field e Back porch goes low for a fixed pulse width on the trailing edge of video input sync pulses Note that for serration pulses during vertical the back porch starts on the rising edge of the serration pulse (with propagation delay) 5 5 Page 11 11 Page

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