SP5054
2.6GHz 3-Wire BUS Controlled Synthesiser
DS3048 - 3.4 May 1996
The SP5054 is a single-chip frequency synthesiser designed
for satellite TV tuning systems. It is a programming variant of
the SP5055, allowing the design of one tuner with either I
2
C bus
or 3-wire bus format, depending on which device is inserted.
The SP5054, when used with a satellite varactor tuner, forms
a complete phase locked loop tuning system.
The circuit consists of a divide-by-16 prescaler with its own
preamplifier and a 14/15-bit programmable divider controlled
by a serially-loaded data register. Four independently
programmable open-collector outputs are included. The device
has four modes of operation, selected by the Mode Select
input; these modes are summarised in Table1.
The comparison frequencies are obtained by the division of
the output of a 4MHz crystal controlled on-chip oscillator. The
phase comparator has a charge pump output with an output
amplifier stage around which feedback may be applied. Only
one external transistor is required for varactor line driving.
FEATURES
s
Complete 2·6GHz Single Chip System
s
62·5kHz, 100kHz and 125kHz Step Size
s
Low Power Consumption (325mW Typ.)
s
Programming Compatible with Toshiba TD6380,
TD6381 and TD6382
*
s
Pin Compatible with SP5055
*
s
Low Radiation
s
Varactor Drive Amplifier Disable
s
Charge Pump Disable
s
Single Port 18/19 Bit Serial Data Entry
s
Four Controllable Outputs
s
ESD Protection †
*
See notes on pin compatibility
† Normal ESD handling precautions should be observed
Fig. 1 Pin connections – top view
APPLICATIONS
s
Satellite TV
s
High IF Cable Tuning Systems
ORDERING INFORMATION
SP5054 KG DPAS
(18-lead plastic package)
SP5054S KG MPAS
(16-lead miniature plastic package)
MITEL [ MITEL NETWORKS CORPORATION ]
