HMC704LP4E Datasheet, PDF (29/44 Pages) Hittite Microwave Corporation – 8 GHz fractionaL-N PLL

v04.0215
HMC704LP4E
8 GHZ FRACTIONAL-N PLL
General Purpose Output (GPO) Pin
The PLL features a General Purpose Output (GPO) on the LD_SDO pin. GPO registers are described in “Reg 0Fh”. The
GPO is a flexible interface that supports a number of different functions and real time test waveforms. The phase noise
performance at this output is poor and uncharacterized. The GPO output should not be toggling during normal operation
otherwise spectral performance may degrade. To use the GPO in HMC SPI mode, bit “Reg 0Fh” [7] must be set to 1.
External VCO, 4.2V Tuning, Passive Filter
The HMC704LP4E is targeted for high performance applications with an external VCO. The PLL charge pump has been
designed to work directly with VCOs that can be tuned nominally over 1.0 to 4.0 Volts on the varactor tuning port with a
+5V charge pump supply voltage. Slightly wider ranges are pos­sible with a +5.2V charge pump supply or with slightly
degraded performance. Hittite HITT-PLL design soft­ware is available to design passive loop filters driven directly from
the PLL charge pump.
External VCO, High Voltage Tuning, Active Filter
Optionally an external op-amp may be used to support VCOs requiring higher voltage tuning ranges. Hittite’s HITT-PLL
design software is available to design active loop filters with external op-amps. Various filter con­figurations are sup-
ported.
Figure 35. Synthesizer with Active Loop Filter and Conventional External VCO
MAIN SERIAL PORT
Serial Port Modes of Operation
The HMC PLL-VCO serial port interface can operate in two different modes of operation.
a. HMC Mode (HMC Legacy Mode) - Single slave per HMCSPI Bus.
b. Open Mode - Up to 8 slaves per HMCSPI Bus. The HMC5675ALP4E only uses 5 bits of address
space.
Both protocols support 5 bits of register address space. HMC Mode can support up to 6 bits of register address but, is
restricted to 5 bits when compatibility with Open Mode is offered.
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