HMC703LP4E Datasheet, PDF (25/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

v02.0813
HMC703LP4E
8 GHz fractional synthesizer
Bi-Phase Modulation
Phase step is programmed in Reg 0Ah as a fraction of 2π, where 2²⁴ = 2π. For example, for bi-phase modulation a
phase step of 180°, program Reg 0Ah= round( (180/360) x 2²⁴ = 8388608d = 800000h).
Phase modulation data is input via a “trigger” source, where the trigger is level dependent (Reg 06h[8] = 0), high
trigger advances the phase and low trigger returns the phase.
Phase Step Control
Phase may also be advanced on the rising edge of the trigger only. Phase step is programmed in Reg 0Ah as a fraction
of 360°, where 2²⁴ = 2π. For example, for a 1° phase step, program Reg 0Ah= round( (1/360) x 2²⁴ = 46603d =B60Bh)
In summary the following procedure is recommended to configure HMC703LP4E for PM mode:
1. Lock in fractional mode (Reg 06h[7:5] = 0) to F = f_PD x (Reg 03h.Reg 04h).
2. Program (Reg 0Ah) to the intended phase step.
3. Change mode to PM (Reg 06h[7:5] = 4).
4. Change trigger option to edge or level (Reg 06h[8])
5. Select the trigger source Reg 06h[9] = 1, TRIG (pin-6), or Reg 06h[9] = 0 - trigger from SPI write to
Reg 0Eh).
Frequency Sweep Mode
The HMC703LP4E features a built-in sweeper mode, that supports external or automatic triggered sweeps. The
maximum sweep range is only limited by the VCO dynamics and range.
Sweeper Mode includes:
a. Automatic 2-Way Sweep Mode
INITIAL trigger, ramp, ramp back, ramp, ramp back, ...
Selected by writing Reg 06h[7:5] = 7
b. Triggered 2-Way Sweep Mode
INITIAL trigger, ramp, wait for trigger, ramp back, wait for trigger, ramp, ...
Selected by writing Reg 06h[7:5] = 6
c. Triggered 1-Way Sweep Mode -
INITIAL trigger, ramp, wait for trigger, hop back to initial frequency, wait for trigger, ramp, ...
Selected by writing Reg 06h[7:5] = 5
Applications include test instrumentation, FMCW sensors, automotive radars and others.
The parameters of the sweep function are illustrated in Figure 31. The HMC703LP4E generates a sweep by
implementing miniature frequency steps in time. A smooth and continuous sweep is then generated, at the output of
the VCO, after the stepped signal is filtered by the loop filter, as shown in Figure 31. The stepped sweep approach
enables the HMC703LP4E to be in lock for entire duration of the sweep. This gives the HMC703LP4E a number of
advantages over conventional methods including:
• The ability to generate a linear sweep.
• The ability to have phase coherence between different ramps, so that the phase profile of each sweep is identical.
• The ability to generate sweeps with identical phase and phase noise performance.
• The ability to generate user defined sweeps in single-step ramp mode.
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