HMC702LP6CE Datasheet, PDF (11/38 Pages) Hittite Microwave Corporation – 14 GHz 16-Bit Fractional-N Synthesizer

v10.0812
HMC702LP6CE
14 GHz 16-BIT FRACTIONAL-N PLL

RF Path ’N’ Divider
The main RF path divider including a fixed divide-by-2, is capable of average divide ratios of even numbers between
131,062 and 72 in fractional mode, and 131,070 to 64 in integer mode. The reason for the difference between integer
and fractional modes is that the fractional divider actually divides by up to ±4 from the average divide number. Actual
division ratios when used with a given VCO will depend upon the reference frequency used and the desired output
band.
General Purpose Output (GPO) Interface
The HMC702LP6CE features a 3-wire General Purpose Output (GPO) interface. GPO registers are described in
Reg1Bh Table 32. The GPO is a flexible interface that supports a number of different functions and real time waveform
access including:
a. General Data Output from SPI register gpo_sel_0_
data (gpo_sel=0)
b. Prescaler & reference path outputs (gpo_sel=1)
c. Lock Detect Windows (gpo_sel=2)
d. Anti-cycle Slip waveforms (gpo_sel=3)
f. Δ∑ Modulator Phase Accumulator (gposel=6)
g. Auxiliary oscillators (gposel=7)
h. Multiple VCO Control, Latch Enables (gposel=9)
i. Δ∑ Modulator Outputs (gposel=10)
e. Internal synchronized frac strobe with clocks
(gposel=4)
General Data to GPO (gpo_sel=0)
Setting register gpo_sel=0 in Table 32 assigns the 3-bit data from register gpo_sel_0_data Reg1B<6:4> to the GPO
bus.
Prescaler and Reference Path Outputs (gpo_sel = 1)
Setting register gpo_sel=1 (Reg1B<3:0> Table 32) results in the input crystal being buffered out to GPO3 as shown in
Figure 6. This is useful for example to generate a copy of the input crystal signal to drive other circuits in the application,
while at the same time isolating the noisy circuits from the sensitive crystal output. Often only the synthesizer requires
very low phase noise from the crystal, hence it is desirable to isolate other circuits from the crystal itself and allow the
synthesizer sole use of the low phase noise crystal.
gpo_sel=1 also routes the 250 MHz 14-bit reference path divider to GP02 and the 16-bit 14 GHz VCO path prescaler
output to GP01. This option allows the synthesizer to function as a stand alone fractional or integer prescaler and
provides visibility into the prescaler and reference path timing for sensitive applications.
Figure 6. gpo_01 Outputs
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