HMC703LP4E【PDF 16/58 页】IC FRACT-N PLL W/SWEEPR 24QFN

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HMC703LP4E

v02.0813

8 GHz fractional syntHesizer

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

978-250-3343 978-250-3373 fax Order On-line at www.hittite.com

Application Support: pll@hittite.com

gcd

, and

gcd

mod

0, where

gcd(

)

channels

vco

vco PD

(eQ 9)

Where:

fPD = frequency of the Phase Detector

fVCO is the desired output frequency

fN , fN+1 are integer multiples of the Phase Detector

fgcd stands for Greatest Common Divisor

eg.

fgcd (4000.200MHz, 50MHz)

= 200kHz

therefore Nchannels = 50 MHz/200 kHz = 250

fVCOn are other VCO frequencies we can exactly tune to, given this fgcd spacing

Figure 30. Exact Frequency Tuning

In the previous paragraph, it was assumed that a single frequency was to be achieved with zero error. Exact frequency

mode also applies to cases where many exact frequencies are required, all of which fit on a particular channel spacing.

Example: To achieve exactly 50 kHz channel steps with a 61.44 MHz reference, calculate fgcd and Nchannels:

fPD = 61.44 MHz

fstep = 50 kHz

fgcd (61.44 MHz, 50 kHz)

Using the Euclidean algorithm to find the greatest common denominator:

61.440 MHz = 50 kHz x 1228 + 50 kHz

50 kHz = 40 kHz x 1 + 10 kHz

40 kHz = 10 kHz x 4 + 0 (0 remainder, algorithm complete)

fgcd (61.44 MHz, 50 kHz) = 10 kHz

Nchannels = 61.44 MHz / 10 kHz = 6144

For improved spectral performance (to keep spurs low and further out of band), it is best to keep fgcd as high as pos-

sible (Nchannels as low possible) for a given application.

Using Hittite exact frequency Mode

To use Exact Frequency Mode, we recommend the following procedure:

Calculate the required fgcd as either gcd(fVCO, fPD) or gcd(fPD, fstep) depending on your application

Calculate the number of channels per integer boundary, Nchannels= fPD / fgcd and program into Reg 0Dh

set the modulator mode to Exact Frequency (sD_MODE in Reg 06h[7:5] = 2)

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