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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: apps@hittite.com
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HMC700LP4 / 700LP4E
v11.0411
8 GHz 16-Bit Fractional-N PLL
Fractional Mode
Fractional Frequency Tuning
the HMc700LP4(E) synthesizer in fractional mode can achieve frequencies at fractional multiples of the reference.
the output frequency of the synthesizer is given by
Where
Nint
is the integer division ratio, an integer number between 36 and 65,567 (see intg table 10)
Nfrac
is the fractional part, a number from 1 to 224 see frac table 11
R
is the reference path division ratio, see rdiv table 9
xtal
is the frequency of the reference oscillator input
PFD
is the PFD operating frequency xtal
/R
as an Example
xtal
= 50 MHz
R
= 1
PFD
= 50 MHz
Nint
= 45
Nfrac
= 1
in this example the output frequency of 2,300,000,002.98 Hz is achieved by programming the 10 bit binary value of
46d =2Eh = 0000 0000 0010 1110 into intg in table 13.
Similarly the 24 bit binary value of the fractional word is written into frac in table 11,
16,777,215d = FFF FFFh = 1111 1111 1111 1111 1111 1111
1d = 000 001h = 0000 0000 0000 0000 0000 0001
Example 2: Set the output to 4.600 025 GHz using a 100 MHz reference, r=2.
Find the nearest integer value, nint, nint = 92, fint = 4.600 000 GHz
this leaves the fractional part to be frac =25 kHz
Since nfrac must be an integer number, the actual fractional frequency will be 4,600,025,001.17Hz, an error of 1.17Hz
or 0.00025ppm.
Here we program the 16 bit nint = 92d = 5ch = 0000 0000 0101 1100 and
the 24 bit nfrac = 8389d = 20c5h = 0000 0010 0000 1100 0101
in addition to the above frequency programming words, the fractional mode must be enabled by setting frac_rstb and
buff_rstb table 13. other DSM configuration registers should be set to the recommended register values.
(EQ 4)
(EQ 5)
(EQ 6)
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