HMC702LP6CE(V03) データシートの表示（PDF） - Hittite Microwave
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HMC702LP6CE Datasheet PDF : 46 Pages
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v03.0709
HMC702LP6CE
14 GHz 16-Bit Fractional-N Synthesizer
VCO Path
The RF path from the VCO to the phase detector, is referred to as the VCO path. The VCO path consists of an input
isolation buffer and a multi-modulus prescaler, or simply the N divider. The N divider is controlled by the fractional
modulator. This path operates with inputs directly from the external VCO.
RF Input Stage
The synthesizer RF input stage routes the external VCO to the phase detector via a 16-bit fractional divider. The RF
input path is rated to operate nominally from 100 kHz to 13 GHz in fractional and 14 GHz in integer modes. The RF
input stage also provides isolation between the VCO and the prescaler. The RF input stage is a differential common
emitter stage, DC coupled for maximum flexibility. The input is protected by ESD diodes as shown in Figure 11.
Normally the RF input is AC coupled to a single ended external source. The RFINP buffer is well matched from a
single ended 50 Ohm source above about 3.5 GHz, with the complimentary input grounded. If a better match is
required at low frequency a simple shunt 50 Ohm resistor can be used external to the package. If a differential external
source is used then the two input pins may be used for best performance.
11
Figure 11. RF Input Stage
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.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
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