EL4583A

Sync Separator, 50% Slice, S-H, Filter, H<sub>OUT</sub>

OVERVIEW

The EL4583A extracts timing from video sync in NTSC, PAL, and SECAM systems, and non-standard formats, or from computer graphics operating at higher scan rates. Timing adjustment is via an external resistor. Input without valid vertical interval (no serration pulses) produces a default vertical output.

Outputs are: composite sync, vertical sync, filter, burst/back porch, horizontal, no signal detect, level, and odd/even output (in interlaced scan formats only).

The EL4583A sync slice level is set to the mid-point between sync tip and the blanking level. This 50% point is determined by two internal sample and hold circuits that track sync tip and back porch levels. It provides hum and noise rejection and compensates for input levels of 0.5V to 2.0VP-P .

A built in filter attenuates the chroma signal to prevent color burst from disturbing the 50% sync slice. Cut off frequency is set by a resistor to ground from the Filter Cut Off pin. Additionally, the filter can be by-passed and video signal fed directly to the Video Input.

The level output pin provides a signal with twice the sync amplitude which may be used to control an external AGC function. A TTL/CMOS compatible No Signal Detect Output flags a loss or reduction in input signal level. A resistor sets the Set Detect Level.

KEY FEATURES

  • NTSC, PAL, and SECAM sync separation
  • Single supply, +5V operation
  • Precision 50% slicing
  • Built-in programmable color burst filter
  • Decodes non-standard vertical
  • Horizontal sync output
  • Sync pulse amplitude output
  • Low-power CMOS
  • Detects loss of signal
  • Resistor programmable scan rate
  • Few external components
  • Available in 16-pin SO (0.150") packages
  • Pb-Free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
EL4583A
Basic Information
生产状态
Mass Production
固定切片 (70mV)
No
切片输入自适应
Yes
颜色突发滤波器 - 内部
Variable
颜色突发滤波器 - 外部
No
输出复合
Yes
输出水平
Yes
输出垂直
Yes
输出突发
Yes
输出奇/偶
Yes
输出同步幅度
Yes
总传播延迟
250 ns
IS
2.5 mA
资质级别
Standard
温度范围
-40 to +85

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