SP5668 Datasheet (Mitel Networks) - 2.7GHz 3-Wire Bus Controlled Synthesiser

SP5668, 2.7GHz 3-Wire Bus Controlled Synthesiser

The SP5668 contains all the elements necessary, with the exception of a frequency reference, loop filter and external high voltage transistor, to control a varicap tuned local oscillator, so forming a complete PLL frequency synthesised source.

The device allows for operation with a high comparison f

SP5668 2.7GHz 3-Wire Bus Controlled Synthesiser Preliminary Information DS4538 - 1.6 January 1997 .

The SP5668 is a single chip frequency synthesiser designed for tuning systems up to 2.7GHz.

The RF preamplifer contains a divide by two prescaler which can be disabled for applications up to 2GHz so enabling a step size equal to the comparison frequency up to 2GHz and twice the comparison frequency up to 2.7GHz.

Comparison frequencies are obtained either from a crystal controlled on chip

SP5668 Features

* s Complete 2.7GHz single chip system s Optimised for low phase noise s Selectable divide by two prescaler s Selectable reference division ratio s Charge pump disable s Varactor line disable s ‘In

* lock’ flag s Two selectable charge pump currents s Three switching ports s Reference frequency o