HMC701LP6CE Datasheet, PDF (10/40 Pages) Hittite Microwave Corporation – 8 GHz 16-Bit Fractional-N Synthesizer

v09.1112
HMC701LP6CE
8 GHz 16-BIT FRACTIONAL-N PLL
Figure 4. Reference Path Block Diagram
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 8 GHz in fractional and 9 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 5. 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.
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