HMC701LP6CE datasheet(22/40 Pages) AD

22 / 40 page

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HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

a. Stepped by an automatic sequencer, or

b. Single stepped by individual triggers in Single Step Mode.

triggering of each sweep, or step, may be configured to operate:

a. Via a serial port write to Reg14h<2> ramp_trigg (if reg 14h<2> = 0 )

b. automatically generated internally,

c. triggered via ttL input on GPo3 reg14h<5> = 1.

Sweep parameters are set as follows:

initial Frequency, fo = current frequency value of the synthesizer, (EQ 12)

Final Frequency, ff = Frequency of the synthesizer at the end of the ramp

the frequency step size while ramping is controlled by rampstep, (Reg15h table 31).

Frequency Step Size Δƒstep = rampstep • fxtal / 2

•

where r is the value of the reference divider (rfp_div_ratio in table 14)

clearing or setting ramp_startdir_dn, (Reg14h<4> table 30), sets the initial ramp direction to be increasing or

decreasing in frequency respectively. Setting ramp_singledir (Reg14h<7> table 30), restricts the direction of the

sweep to the initial sweep direction only.

the sweeper timebase Tref is the period of the divided reference, fPFD, at the phase detector Tref

the total number of ramp steps taken in a single sweep is given by ramp_steps_number in reg16h table 32.

the total time to ramp from fo to ff is given by Tramp = Tref • ramp_steps_number

CW Sweeper Mode (Continued)

the final ramp frequency, ff, is given by ƒƒ = ƒi + Δƒstep • ramp_steps_number

Sweeper action at the end of sweep depends upon the mode of the sweep:

a. With both ramp_singledir and ramp_repeat_en disabled, at the end of the ramp time, Tramp,

the sweeper will dwell at the final frequency ff, until a new trigger is received. the next trigger will

reverse the current sequence, starting from ff, and stepping back to fo. odd triggers will ramp in the

same direction as the initial ramp, even triggers will ramp in the opposite direction.

b. with ramp_singledir enabled and ramp_repeat_en disabled, at the end of the ramp time, Tramp,

the sweeper will dwell at the final frequency ff, until a new trigger is received. the second trigger

will hop the synthesizer back to the initial frequency, fo. the third trigger will restart the sweep from

fo. Hence all odd numbered triggers will start a new ramp in the same direction as the initial ramp,

even numbered triggers will hop the synthesizer from the current frequency to fo , where it will wait

for a trigger to start a sweep.

Ramp Busy

in all types of sweeps ramp_busy will indicate an active sweep and will stay high between the 1st and nth ramp step.

ramp_busy may be monitored one of two ways. ramp_busy is readable via read only register Reg1Fh<5> table 41.

ramp_busy may also be monitored on GPo2, hardware pin 24, by setting Reg1Bh<3:0> =8h table 37.

Autosweep Mode

the autosweep mode is similar to Figure 15 except that once started, triggers are not required. once enabled, (ramp_

repeat_en=1 Reg14h<3> table 30) the autosweep mode initiates the first trigger, steps n times, one step per ref clock

cycle, and then waits for the programmed dwell period and automatically triggers the ramp in the opposite direction.

the sweep process continues alternating sweep directions until disabled. dwell_time (Reg17h table 33) controls the

number of Tref periods to wait at the end of the ramp before automatically retriggering a new sweep.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

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