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GS9029 Datasheet(PDF) 6 Page - Gennum Corporation |
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GS9029 Datasheet(HTML) 6 Page - Gennum Corporation |
6 / 8 page 521 - 97 - 02 6 DETAILED DESCRIPTION INPUT INTERFACING SDI/SDI are high impedance differential inputs. Two conditions must be observed when interfacing to these inputs: 1. The input signal amplitude must be between 80mV and 1000mV. 2. The common mode voltage range must be as specified in the DC Characteristics Table (page 2). For 800mV input amplitude signals, this corresponds to a common mode voltage range between 2.8 and 4.6 volts. Figures 6 and 7 illustrate two methods of interfacing the GS9029 to the Gennum GS9024 (Cable Equalizer), GS9035 (Reclocker) or the GS9025 (Receiver). Figure 6 illustrates the simplest interface and is recommended when the trace lengths between the driver and the GS9029 are less than 0.5 in. Fig. 6 Interfaces using Internal SDI Terminations When trace lengths become longer than 0.5in. and data rates greater than 360Mb/s, electromagnetic reflections begin to affect signal integrity. To minimize reflections, controlled impedance traces and source and end terminations should be used as shown in Figure 7. Although terminations on both sides reduce the signal swing by a factor of two, the GS9029 is designed to meet this need with ultra low input amplitude requirements (as low as 80mV). Fig. 7 Interfaces using Internal SDI Terminations Connected to AC Ground The GS9029 can accept AC coupled input signals with no extra configuration required. OUTPUT INTERFACING Figure 8 illustrates the recommended interface for ac coupled outputs. Fig. 8 Interfaces for AC Coupled Outputs 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 GS9029. 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 GS9029 outputs are adjustable from as low as 50mV to as high as 1000 mV. The output amplitudes are set by the RSET0 and the RSET1 resistors respectively. The relationship between the approximate output amplitude (VOUT) and RSET is given by the equation below: where ZO is in ohms and VOUT is in volts. The minimum value of RSET is 43.2Ω. For 75Ω cable and 800mV output amplitudes, the value of RSET is 54.9Ω. Also, note that the above formula assumes that the transmission line is properly end terminated. VCC 10nF + _ SDI/T SDI/T GS9029 + _ GS9028 + _ SDI/T 10nF SDI/T GS9029 + _ 75 75 VCC 10nF RT GS9028 R RT = R = ZO GS9029 R L L RT VCC + _ 10nF 1µF 1µF R SET 1.154 Z O × 2V OUT × ----------------------------- = |
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