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GS9015ACTJ Datasheet(PDF) 10 Page - Gennum Corporation |
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GS9015ACTJ Datasheet(HTML) 10 Page - Gennum Corporation |
10 / 13 page 10 520 - 99 - 05 Fig. 14 GS9015A Typical Test Circuit Using -5V Supply All resistors in ohms, all capacitors in microfarads unless otherwise stated. VCO Frequency Setting Resistors There are two modes of VCO operation available in the GS9015A depending on the state of the ÷2 block. The ÷2 block is enabled according to : ÷2 ENABLE = ƒ/2 • SS1. When the ƒ/2 ENABLE (pin 10) is LOW, any of the four VCO frequency setting resistors, RVCO0 through RVCO3, (pins 13, 14, 15 and 17) may be used for any data rate from 100 Mb/s t o 400 Mb/s. For example, for 143 Mb/s data rate, the value of the total RVCO resistance is approximately 6k8 and for 270 Mb/s operation, the value is approximately 3k5. The 5k potentiometers will then tune the desired data rate near their mid-points. Jitter performance at the lower data rates (143, 177 Mb/s) is improved by operating the VCOat twice the normal frequency. This is accomplished by enabling the divide by two block in the PLL section of the GS9015A. When ƒ/2 (Pin 10) is HIGH, two of the RVCO pins are assigned to data rates below 200 Mb/s and two are assigned to data rates over 200 Mb/s. The selection is dependent upon the level of STANDARD SELECT BIT, SS1 (pin 21). When SS1 is LOW, RVCO0 and RVCO1 (pins 13 and 14) are used for the higher data rates. When SS1 is HIGH, the VCO frequency is now twice the bit rate and its frequency is set by RVCO2 and RVCO3 (pins 15 and 17). For 143 Mb/s and 270 Mb/s operation, (the VCO is at 286 MHz and 270 MHz respectively) the total resistance required is approximately the same for both data rates. This also applies for 177 Mb/s and 360 Mb/s operation (the VCO is tuned to 354 MHz and 360 MHz respectively). This means that one potentiometer may be used for each frequency pair with only a small variation of the fixed resistor value. This halves the number of adjustments required. ECL DATA INPUTS -5V -5V -5V 100 100 100 100 390 390 390 390 0.1 µ 25 24 23 22 21 20 19 5 6 7 8 9 10 11 4 3 2 1 28 27 26 12 13 14 15 16 17 18 910 5.6p 10n -5V ÷1 ÷2 0.1 µ 10k DATA CARRIER DETECT OUTPUT DATA CLOCK CLOCK GS9015A DD I DD I VCC1 VEE1 VEE1 ƒ/2 VEE3 SDO SDO SCO SCO SS1 SS0 CD STAR ROUTED LOOP VOLTAGE See Figure 15 -5V -5V -5V 0.1 µ |
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