el4584 Intersil Corporation, el4584 Datasheet
el4584
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el4584 Summary of contents
Page 1
... Data Sheet Horizontal Genlock The EL4584 is a PLL (Phase Lock Loop) sub system, designed for video applications but also suitable for general purpose use up to 36MHz. In video applications, this device generates a TTL/CMOS compatible Pixel Clock (CLK OUT) which is a multiple of the TV horizontal scan rate and phase locked to it ...
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... Pinout EL4584 (16-PIN SO, PDIP) TOP VIEW 2 EL4584 FN7174.2 July 25, 2005 ...
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... OH = 3.2mA OL = -3.2mA OH = 200µ -200µ 2.5V OUT = 2.5V OUT = 2.5V OUT > V > OUT = 5V 25°C unless otherwise noted DD A CONDITIONS = 5V (Note 1) input to EL4584. Test for positive signal lock. SYNC CC MIN TYP MAX UNIT 1.5 V 3.5 V -100 nA 100 nA -100 -60 µA 60 100 µA 0 ...
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... EL4584 Digital inputs to select ÷ N value for internal counter. See table below for values. Output of internal inverter/oscillator. Connect to external crystal or LC tank VCO circuit. Analog positive supply for oscillator, PLL circuits. Input from external VCO. Analog ground for oscillator, PLL circuits. ...
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... Timing Diagrams FIGURE 1. PLL LOCKED CONDITION (PHASE ERROR = 0) 5 EL4584 θ Tθ = phase error period FIGURE 2. OUT OF LOCK CONDITION FIGURE 3. TEST CIRCUIT 1 Falling edge 110ns locks SYNC to rising edge of Ext Div signal. ) × 360° = (Tθ/ period ...
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... JA 0.8 0.6 SO16 (0.150”) θ 0.4 =110°C AMBIENT TEMPERATURE (°C) 6 EL4584 EL4584 OSC GAIN @ 20MHz vs TEMPERATURE OSC GAIN vs F OSC Package Power Dissipation vs Ambient Temperature JEDEC JESD51-7 High Effective Thermal Conductivity Test Board 2 1.8 1.6 1.43W 1.4 1.25W 1.2 1 0.8 0.6 0.4 0 ...
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... The clock is generated by the signal on pin 5, OSC in. There are 2 general types of VCO that can be used with the EL4584, LC and crystal controlled. Additionally, each type can be either built up using discrete components, including a varactor as the frequency controlling element, or complete, self contained modules can be purchased with everything inside a metal can ...
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... VCO frequency as constant a 8 EL4584 possible. VCO frequency will drift as charge leaks from the filter capacitor, and the voltage changes the VCO operating point. Coast mode is intended to be used when noise or signal degradation result in loss of horizontal sync for many cycles ...
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... NOTE: Use shielded inductors for optimum performance. FIGURE 5. TYPICAL XTAL VCO 9 EL4584 XTAL VCO COMPONENT VALUES (APPROXIMATE) FREQUENCY (MHz) 13.301 13.5 14.75 17.734 10.738 12.273 14.318 The above oscillators are arranged as Colpitts oscillators, and the structure is redrawn here to emphasize the split capacitance used in a Colpitts oscillator ...
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... Where ϖ = loop filter bandwidth, and ζ = loop filter damping n factor 300µA/2πrad = 4.77e-5A/rad for the EL4584 The loop bandwidth should be about H frequency/20, and the damping ratio should be 1 for optimum performance. For our example, ϖ = 15.734kHz/20 = 787Hz≈5000rad/S. ...
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... The entire oscillator/filter section should be surrounded by copper ground to prevent unwanted influences from nearby signals. Use separate paths for 11 EL4584 analog and digital supplies, keeping the analog (oscillator section) as short and free from spurious signals as possible. Careful attention must be paid to correct bypassing. Keep ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 12 EL4584 (2) XTAL El Monte, CA 91731 (818) 443-2121 Varactors • ...