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GS1508 Datasheet(PDF) 6 Page - Gennum Corporation |
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GS1508 Datasheet(HTML) 6 Page - Gennum Corporation |
6 / 8 page 522 - 02 - 03 6 TYPICAL APPLICATION CIRCUIT APPLICATION INFORMATION PCB LAYOUT Special attention must be paid to component layout when designing serial digital interfaces for HDTV. Figures 8 through 11 show the artwork for a four layer printed circuit evaluation board for the GS1508. The schematic is shown in Figure 7. An FR-4 dielectric can be used, however, controlled impedance transmission lines are required for PCB traces longer than approximately 1cm. Note the following PCB artwork features used to optimize performance: PCB trace width for HD rate signals is closely matched to SMT component width to minimize reflections due to change in trace impedance The PCB ground plane is removed under the GS1508 output components to minimize parasitic capacitance. The PCB ground plane is removed under the GS1508 RSET pin and resistor to minimize parasitic capacitance Input and output BNC connectors are surface mounted in- line to eliminate a transmission line stub caused by a BNC mounting via High speed traces are curved to minimize impedance changes due to change of PCB trace width. TABLE 2: Typical Application Circuit Component Values COMPONENT VALUE COMMENT RSET 53.6 For 800mV Output Z0 50 Ω For 50 Ω PCB trace impedance LCOMP 12nH Typical value. Component value will vary depending on PCB layout. CCOMP 0.5pF Typical value. Component value will vary depending on PCB layout. SDO SDO GND VCC SDI SDI VEE RSET 53.6 Z0 Z0 0µ1 VCC LCOMP LCOMP 4µ7 4µ7 OUT OUT 75 75 CCOMP CCOMP PECL INPUT 1n 75 75 VCC 100n + + 1 2 3 4 8 7 6 5 GS1508 All resistors in ohms, all capacitors in farads, unless otherwise shown. |
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Similar Description - GS1508 |
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