The SP8855D is one of a family of parallel load synthesisers containing all the elements apart from the loop amplifier to fabricate a PLL synthesis loop. Other parts in the series are the SP8852D which is a fully programmable device requiring two 16 bit words to set the RF and reference counters, and the SP8854D which has hard wired reference counter programming and requires a single bit word to program the RF divider.

FEATURES
■ 1.7GHz Operating Frequency
■ Single 5V Supply Operation
■ Low Power Consumption <1.3W
■ High Comparison Frequency 50MHz
■ High Gain Phase Detector 1mA/rad
■ Programmable Phase Detector Gain
■ Zero ‘‘Dead Band” Phase Detector
■ Wide range of RF and Reference Divide Ratios
■ Programming by Hard Wired Inputs