el4585 Intersil Corporation, el4585 Datasheet
![no-image](/images/manufacturer_photos/0/3/342/intersil_corporation_sml.jpg)
el4585
Available stocks
Related parts for el4585
el4585 Summary of contents
Page 1
... Data Sheet Horizontal Genlock The EL4585 is a PLL (Phase Lock Loop) sub-system, designed for video applications and 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 ...
Page 2
... Demo Board A demo PCB is available for this product. Pinout EL4585 (16-PIN SO, PDIP) TOP VIEW 2 EL4585 FN7175.3 July 1, 2005 ...
Page 3
... OL = -1.6mA 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 input to EL4585. Test for positive signal lock. SYNC Min Typ Max UniT 1.5 V 3.5 V -100 nA 100 nA -100 -60 µA 60 100 µA 0.4 V 2.4 V ...
Page 4
... EL4585 Digital inputs to select ÷ N value for internal counter. See Table 1 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. ...
Page 5
... Timing Diagrams Test Circuit 5 EL4585 PLL LOCKED CONDITION (PHASE ERROR = 0) OUT OF LOCK CONDITION TEST CIRCUIT 1 θ × 360° = Tθ period H YNC Tθ = phase error period FN7175.3 July 1, 2005 ...
Page 6
... PDIP16 1 0.91W θ JA 0.8 0.6 SO16 (0.150”) θ 0.4 =110°C AMBIENT TEMPERATURE (°C) 6 EL4585 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 =81°C/W 1 0.8 0.6 0.4 0 100 125 150 ...
Page 7
... 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 EL4585, 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 ...
Page 8
... The phase detector will not attempt to adjust to the 8 EL4585 resultant loss of signal so that when horizontal sync returns, sync lock can be re-established quickly. However, if much VCO drift has occurred, it may take as long to re-lock as when restarting ...
Page 9
... NOTE: Use shielded inductors for optimum performance. TYPICAL XTAL VCO 9 EL4585 Typical Application Horizontal genlock provides clock for an analog to digital converter, digitizing analog video. (pF) C (pF) FREQUENCY 2 (MHz) 220 26.602 220 220 220 35.468 220 21.476 220 24 ...
Page 10
... Where ω = loop filter bandwidth, and ζ = loop filter damping n factor 300µA/2πrad = 4.77e-5A/rad for the EL4585 The loop bandwidth should be about H frequency/20, and the damping ratio should be 1 for optimum performance. For our example, ω = 15.734kHz/20=787 Hz≈5000 rad/S. ...
Page 11
... EL4585/4 Demo Board 11 EL4585 PCB Layout Considerations It is highly recommended that power and ground planes be used in layout. The oscillator and filter sections constitute a C (µF) C (µF) feedback loop and thus care must be taken to avoid any ...
Page 12
... 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 EL4585 (2) XTAL • SaRonix 151 Laura Lane ...