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GS9028 Datasheet(PDF) 6 Page - Gennum Corporation |
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GS9028 Datasheet(HTML) 6 Page - Gennum Corporation |
6 / 7 page 521 - 68 - 05 6 of 7 The termination resistor (RT) value should be equal to the characteristic impedance of the cable. Controlled impedance traces should be used for the outputs and the termination resistors should be placed near the GS9028. The inductor (L) and resistor (R) are used to optimize the output return loss and are PCB dependent. Typically, R equals the transmission line characteristic impedance and L is approximately 8.2nH. OUTPUT AMPLITUDE ADJUSTMENT The GS9028 outputs are adjustable from as low as 50mV to as high as 1000mV. The output amplitude is set by the RSET resistor connected to pin 4. The relationship between the output amplitude (VOUT) and RSET is approximately given by the equation below: RSET = (1.3696 x ZO)/(2 x VOUT) - 5.5 where ZO is in ohms and VOUT is in volts. The minimum value of RSET is 46Ω. For 75Ω cable and 800mV output amplitudes, the value of RSET is 59Ω. Also, note that the above formula assumes that the transmission line is properly end terminated. TYPICAL APPLICATION CIRCUIT 75 75 75 75 59 10n 8.2nH 1µ 1µ 1µ 100n VCC RSET VEE SDO SDO VEE SDI SDI VCC VCC 8.2nH GS9028 4 3 2 1 5 6 7 8 All resistors in ohms, all capacitors in farads, unless otherwise shown. |
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