HMC700LP4 Datasheet, PDF (24/36 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N PLL

v07.0411
HMC701LP6CE
8 GHz 16-Bit Fractional-N PLL
Single Step Ramp Mode
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A Single Step 1-Way Ramp is shown in Figure 17. In this mode, a trigger is required for each step of the ramp. Single
step will function in either 1-Way or 2-Way ramps. Similar to autosweep, the ramp_busy flag will go high on the first
trigger, and will stay high until the nth trigger. The n+1 trigger will cause the ramp to jump to the start frequency in
1-way ramp mode. The n+2 trigger will restart the 1-way ramp.
Figure 17. Single Step Ramp Mode
The user should be aware that the synthesized ramp is subject to normal phase locked loop dynamics. If the loop
bandwidth in use is much wider than the rate of the steps then the locking will be very fast and the ramp will have a
staircase shape. If the update rate is higher than the loop bandwidth, as is normally the case, then the loop will not
fully settle before a new frequency step is received. Hence the swept output will have a small lag and will sweep in a
near continuous fashion.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: [e-mail]
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