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GS9068-CTAE3 Datasheet(PDF) 6 Page - Gennum Corporation |
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GS9068-CTAE3 Datasheet(HTML) 6 Page - Gennum Corporation |
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6 / 8 page  GENNUM CORPORATION 22213 - 2 6 of 8 3.4 OUTPUT AMPLITUDE ADJUSTMENT The output amplitude of the GS9068 can be adjusted by changing the value of the RSET resistor as shown in Figure 2 and Table 1 below. For an 800mVp-p output with a nominal ±7% tolerance, a value of 750 Ω is required. A ±1% SMT resistor should be used. Fig. 2 Output Amplitude Adjustment The RSET resistor is part of the high speed output circuit of the GS9068. The resistor should be placed as close as possible to the RSET pin. In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. NOTE: For reliable operation of the GS9068 over the full temperature range, do not use an RSET value below 573Ω. 4. APPLICATION REFERENCE DESIGN 4.1 PCB LAYOUT 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: • The PCB groundplane is removed under the GS9068 output components to minimize parasitic capacitance. • The PCB ground plane is removed under the GS9068 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 which are curved to minimize impedance variations due to change of PCB trace width. 4.2 TYPICAL APPLICATION CIRCUIT 1100 1000 900 800 700 700 800 900 1000 R SET ( Ω) 600 600 500 Table 1: RSET vs VOD RSET (Ω) OUTPUT SWING 995 608mV 824 734mV 750 800mV 600 884mV 573 1040mV GS9068 1 2 3 4 8 7 6 5 SDI SDI VEE RSET SDO SDO NC VCC 10n 75 5.6n 4u7 BNC VCC 75 5.6n 10n 75 4u7 49.9 750 10n 49.9 4u7 75 BNC VCC 4u7 VCC * TYPICAL VALUE VARIES WITH LAYOUT DIFFERENTIAL DATA INPUT * * NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted. |
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