HMC701LP6CE Datasheet, PDF (23/40 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v09.1112
HMC701LP6CE
8 GHz 16-BIT FRACTIONAL-N PLL
2-Way Sweeps
If ramp_repeat_en (Reg14h<3> Table 30) is cleared, then the ramps are triggered by
a. Writing to ramp_trigg (Reg14h<2> Table 30), if bit <2> = 0, or
b. by rising edge TTL signal input on GPO3, if ramp_trig_ext_en is set, and GPO3 is enabled.
All functions are the same in Figure 15 for Autosweep or 2-Way Triggered sweeps, the only difference is the trigger
source is generated internally for autosweep, and is input via serial port or GPO3 for triggered sweeps. Sweep_busy
will go high at the start of every ramp and stay high until the nth step in the ramp.
Figure 15. 2-Way Sweep Control via Trigger
Triggered 1-Way Sweeps
1-Way sweeps are shown inFigure 16.
Unlike 2-Way sweeps, 1-Way sweeps require that the VCO hop back to the start frequency after the dwell period.
Triggered 1-Way sweeps also require a 3^rd trigger to start the new sweep. The 3^rd trigger must be timed appropriately
to allow the VCO to settle after the large frequency hop back to the start frequency. Subsequent odd numbered
triggers will start the 1-Way sweep and repeat the process.
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