EL1881

Sync Separator, Low Power

OVERVIEW

The EL1881 video sync separator is manufactured using Elantec's high performance analog CMOS process. This device extracts sync timing information from both standard and non-standard video input. It provides composite sync, vertical sync, burst/back porch timing, and odd/even field detection. Fixed 70mV sync tip slicing provides sync edge detection when the video input level is between 0.5VP-P and -2VP-P (sync tip amplitude 143mV to 572mV). A single external resistor sets all internal timing to adjust for various video standards. The composite sync output follows video in sync pulses and a vertical sync pulse is output on the rising edge of the first vertical serration following the vertical pre-equalizing string. For non-standard vertical inputs, a default vertical pulse is output when the vertical signal stays low for longer than the vertical sync default delay time. The odd/even output indicates field polarity detected during the vertical blanking interval. The EL1881 is plug-in compatible with the industry-standard LM1881 and can be substituted for that part in 5V applications with lower required supply current.

The EL1881 is available in the 8 Ld PDIP and SOIC packages and is specified for operation over the full -40°C to +85°C temperature range.

KEY FEATURES

  • NTSC, PAL, SECAM, non-standard video sync separation
  • Fixed 70mV slicing of video input levels from 0.5VP-P to 2VP-P
  • Low supply current - 1.5mA typ.
  • Single +5V supply
  • Composite, vertical sync output
  • Odd/even field output
  • Burst/back porch output
  • Available in 8 Ld PDIP and SOIC packages
  • Pb-free available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
EL1881
Basic Information
Production Status
Mass Production
Slicing Fixed (70mV)
Yes
Slicing Input Adaptive
No
Color Burst Filter - External
Yes
Outputs Composite
Yes
Outputs Horizontal
No
Outputs Vertical
Yes
Outputs Burst
Yes
Outputs Odd/Even
Yes
Outputs Sync Amplitude
No
Composite Propagation Delay
30 ns
IS
1.2 mA
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +85

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