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843204AGI-01LF Datasheet(PDF) 8 Page - Integrated Device Technology |
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843204AGI-01LF Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 14 page FEMTOCLOCKS™ CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER 843204I-01 DATA SHEET 8 REVISION A 11/5/15 TERMINATION FOR 3.3V LVPECL OUTPUT The clock layout topology shown below is a typical termination for LVPECL outputs. The two different layouts mentioned are recom- mended only as guidelines. FOUT and nFOUT are low impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 Ω transmission FIGURE 5B. LVPECL OUTPUT TERMINATION FIGURE 5A. LVPECL OUTPUT TERMINATION lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 5A and 5B show two different layouts which are recommended only as guidelines. Other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. INPUTS: CRYSTAL INPUTS For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not required, but for additional protection, a 1k Ω resistor can be tied from XTAL_IN to ground. CLK INPUT For applications not requiring the use of a clock input, it can be left floating. Though not required, but for additional protection, a 1k Ω resistor can be tied from the CLK input to ground. CLK/nCLK INPUTS For applications not requiring the use of the differential input, both CLK and nCLK can be left floating. Though not required, but for additional protection, a 1k Ω resistor can be tied from CLK to ground. LVCMOS CONTROL PINS All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1k Ω resistor can be used. RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS OUTPUTS: LVPECL OUTPUTS All unused LVPECL outputs can be left floating. We recommend that there is no trace attached. Both sides of the differential output pair should either be left floating or terminated. |
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