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 oscillator or from an external source.
The device contains three switching ports, P0 – P2,
together with an ’in–lock’ flag output. Various test modes
including varactor disable and charge pump disable are also
included.
CHARGE PUMP
CAP Q1
CRYSTAL Q2
ENABLE
DATA
CLOCK
PORT P2
PORT P1/OC
DRIVE
V
EE
RF INPUT
RF INPUT
V
CC
LOCK
REF
PORT P0/OC
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 output
s
ESD protection (Normal ESD handling procedures
should be observed)
MP16
Fig. 1 Pin connections - top view
APPLICATIONS
s
SAT, TV, VCR and Cable tuning systems
s
Communications systems
ORDERING INFORMATION
SP5668/KG/MP1S (Tubes,)
SP5668/KG/MP1T Tape and Reel)
MITEL [ MITEL NETWORKS CORPORATION ]
