SP8854EKGHCAR

SP8854E 2·7GHz Parallel Load Professional Synthesiser Preliminary Information Supersedes January 1996 version, DS4238 - 1.2 DS4238 - 2.0 June 1998 The SP8854E 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 SP8852E which is fully programmable, requiring tw0 16bit words to set the RF and reference counters and the SP8855E which is fully programmable using hard wired links or switches. The SP8854E is programmed using a 16-bit parallel data bus. Data is stored in an internal buffer. The 10-bit programmable reference divider is programmed by connecting the 10 programming pins either to ground or 15V. The device can therefore be programmed with a single transfer from the control microprocessor. Hard wired inputs can also control the FPD and FREF outputs and the control sense of the loop. DATA BIT 5 DATA BIT 6 DATA BIT 7 DATA BIT 8 DATA BIT 9 DATA BIT 10 DATA BIT 11 DATA BIT 12 DATA BIT 13 DATA BIT 14 DATA BIT 15 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 by Single Word Data Transfer ABSOLUTE MAXIMUM RATINGS Supply voltage Operating temperature Storage temperature Prescaler and reference input voltage Data inputs Junction temperature 20·3V to...