The SP5658 is a single chip frequency synthesizer designed for tuning systems up to 2.7GHz.The RF preamplifier contains a divide by two prescaler which can be disabled for applications up to 2GHz so enabling 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 oscillator or from an external source.The device contains two switching ports, in the 14 pinversion and four in the 16 pin, together with an ‘‘in–lock” flagoutput. The device also contains a varactor line disable and charge pump disable facility.

FEATURES

Complete 2.7GHz single chip system
Optimized for low phase noise
Selectable divide by two prescaler
Selectable reference division rationCharge pump disable
Varactor line disable
‘In–lock’ flag
Two switching ports in 14 pin version
Four switching ports in 16 pin version
Pin compatible with SP5659 I 2 C bus low phase noise synthesiserPP
ESD protection (Normal ESD handling procedures should be observed)

APPLICATIONS

SAT, TV, VCR and Cable tuning systems
Communications systems