HMC703LP4E Datasheet, PDF (38/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER

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HMC703LP4E
8 GHz fractional synthesizer
VCO Tuning
Passive Filter
The HMC703LP4E is targeted for high performance applications with an external VCO. The synthe­sizer 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 +5 V charge pump supply voltage. Slightly wider ranges are pos­sible with a +5.2 V charge pump supply or
with slightly degraded performance. Hittite PLL Design soft­ware is available to design passive loop filters driven directly
from the PLL charge pump.
High Voltage Tuning, Active Filter
Optionally an external op-amp may be used in the loop filter to support VCOs requiring higher voltage tuning ranges.
Loop filter design is highly application specific, and can have significant impact on the PLL performance. Its impact on
PLL performance should be well characterized, and optimized for best PLL performance. Hittite’s PLL Design software
is available to design active loop filters with external op-amps. Various filter con­figurations are supported.
Figure 40. 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 HMC703LP4E 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.
Register 0 Modes
Register 0 has a dedicated function in each mode. Open Mode allows wider compatibility with other manu­facturers SPI
protocols.
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