HMC702LP6CE Datasheet, PDF (20/38 Pages) Hittite Microwave Corporation – 14 GHz 16-Bit Fractional-N Synthesizer

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

Figure 15. Charge Pump Gain, Trim and Phase Offset Control
Frequency Programming
The HMC702LP6CE can operate in either fractional mode or integer mode. In integer mode of operation the delta
sigma modulator is disabled. Frequency programming and mode control is described below.
Fractional Frequency
The fractional frequency synthesizer, when operating in fractional mode, can lock to frequencies which are fractional
multiples of the reference frequency.
Fractional mode is the default mode. To run in fractional mode ensure that dsm_integer_mode Reg12h<3> Table 24
is clear and dsm_rstb is set Reg01<13> Table 7. Then program the frequency as explained below:
The output frequency of the synthesizer is given by, f_vco, where
Fractional Frequency
of VCO
(EQ 13)
where
N_int
is the integer division ratio, an integer number between 36 and 65,533
(dsm_intg (Reg0Fh Table 21))
N_frac
R
is the fractional part, a number from 1 to 2²⁴ (dsm_frac Reg10h Table 22)
is the reference path division ratio, (rfp_div_ratio Reg03h<13:0> Table 9)
f_xtal
is the frequency of the crystal oscillator input (XSIN or XREF Figure 4)
As an Example:
f_xtal
R
f_ref
= 50 MHz
=1
= 50 MHz
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