[plessey]

DESCRIPTION
The SP8855E 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 devices in the series are the SP8852 which is a fully programmable device requiring two 16 bit words to set the RF and reference counters, and the SP8854 which has hard wired reference counter programming and requires a single bit word to program the RF divider. The SP8855E is intended for applications where a fixed synthesiser frequency is required although it can also be used where frequency selection is set by switches.

FEATURES
• 2.8GHz Operating Frequency (IG GRADE)
• Single 5V Supply Operation
• 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
• Low cost plastic package option