SP8852

SP8852E 2·7GHz Parallel Load Professional Synthesiser Preliminary Information Supersedes January 1996 version, DS4237 - 1.2 DS4237 - 2.0 June 1998 The SP8852E 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 SP8854E which has hard wired reference counter programming and requires only a single 16-bit programming word, and the SP8855E which is fully programmable using hard wired links or switches. The SP8852E is programmed using a 16-bit parallel data bus. Data can be stored in one of two internal buffers, selected by a single address bit on the input interface. In order to fully program the device, two 16-bit words are required, one to select the RF division ratio (A and M counters) and phase detector gain, and one to set the 10-bit reference divider count, phase detector state and sense. Once the reference divide ratio has been set, frequency changes can be made by a single 16-bit data load entry to the RF divider chain. B4 B3 B2 B1 B0 0V (PRESCALER) RF INPUT RF INPUT VCC (PRESCALER) VEE LOCK DETECT B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 1 44 SP8852E STROBE ADDRESS NC NC NC NC NC NC NC NC NC FEATURES s 2·7 GHz Operating Frequency s Single 5V Supply s Low Power Consumption <1·3W s High Comparison Frequency : 20MHz s High Gain Phase Detector : 1mA/rad s Zero ‘Dead Band’ Phase Detector s Wide Range of RF and Reference Division Ratios s Programming...