EL4585C Elantec Semiconductor, Inc. (acquired by Intersil), EL4585C Datasheet
EL4585C
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EL4585C Summary of contents
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... EL4585C Horizontal Genlock 8 F General Description The EL4585C is a PLL (Phase Lock Loop) sub system designed for video applications but also suitable for general purpose use MHz In a video application this device generates a TTL CMOS compatible Pixel Clock (Clk Out) which is a multi- ...
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... EL4585C Horizontal Genlock Absolute Maximum Ratings V Supply CC Storage Temperature Lead Temperature Pin Voltages Operating Ambient Temperature Range Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually ...
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... H-sync S N Ratio V 5V (Note Jitter VCXO Oscillator Jitter LC Oscillator (Typ) Note 2 Noisy video signal input to EL4583C H-sync input to EL4585C Test for positive signal lock Pin Description Pin No Pin Name Prog Digital inputs to select 3 Osc VCO Out Output of internal inverter oscillator Connect to external crystal or LC tank VCO circuit ...
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... EL4585C Horizontal Genlock 8 F Timing Diagrams PLL Locked Condition (Phase Error Typical Performance Curves 4585 – 2 Out of Lock Condition Test Circuit 1 4585 – 360 H-sync period phase error period 4585 – 3 ...
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... Typical Performance Curves Idd vs Fosc Typical Varactor 4585 – 7 EL4585 Block Diagram Horizontal Genlock 8 F Contd OSC Gain 20 MHz vs Temp 4585 – 4 OSC Gain vs Fosc Charge Pump Duty Cycle Vs 4585 – EL4585C SC 4585 – 4585 – 9 4585 – 1 ...
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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 EL4585C LC and crys- tal controlled Additionally each type can be ei- ther built up using discrete components includ- ...
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... EXT DIV in sync with the falling edge of H-SYNC 110nS (See timing diagrams ) In- a creasing R decreases phase error while decreas- 2 ing R increases phase error (Phase error is posi- 2 tive when EXT DIV lags H-SYNC ) The resist- ance needed will depend on VCO design or VCXO module selection 7 EL4585C SC will 2 ...
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... EL4585C Horizontal Genlock 8 F Applications Information Choosing External Components 1 To choose LC VCO components first pick the desired operating frequency For our example we will use 28 636MHz with an H-sync fre- quency of 15 734kHz 2 Choose a reasonable inductor value (1-5 H works well) We choose Calculate C ...
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... V1 is the primary control device C than C so that V has maximum modulation V 1 capability The frequency of oscillation is given EL4585C SC 4585 – 18 4585 – iso- 2 should be much larger ...
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... K 300 A 2 rad 4 77e-5A rad for the EL4585C 2 The loop bandwidth should be about H-sync frequency 20 and the damping ratio should be 1 for optimum performance For our example 15 734kHz 20 787 Hz 5000 rad ...
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... Self contained VCXO or VCO modules are already mounted in a shielding cage and therefore do not require as much consideration in layout Many crystal manufacturers publish informative litera- ture regarding use and layout of oscillators which should be helpful 11 EL4585C ...
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... EL4585C Horizontal Genlock 8 F EL4585 4 Demo Board SC 12 ...
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... EL4585 4 Demo Board The VCO and loop filter section of the EL4583 4 5 Demo Board can be implemented in the following configurations Horizontal Genlock 8 F Contd (1) VCXO (2) XTAL (3) LC Tank 13 EL4585C SC 4585 – 20 4585 – 21 4585 – 22 ...
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... EL4585C Horizontal Genlock 8 F Component Sources Inductors Dale Electronics E Highway 50 PO Box 180 Yankton SD 57078-0180 (605) 665-9301 Crystals VCXO VCO Modules Connor-Winfield 2111 Comprehensive Drive Aurora IL 60606 (708) 851-4722 Piezo Systems 100 K Street PO Box 619 Carlisle PA 17013 (717) 249-2151 Reeves-Hoffman 400 West North Street ...