SP5654SLASHKGSLASHMPAS datasheet(3/15 Pages) ZARLINK

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ADVANCE INFORMATION

FEBRUARY 1994

D.S. 3931 1.5

SP5654

2.7GHz 3–WIRE BUS CONTROLLED SYNTHESISER

The SP5654 is a single chip frequency synthesiser

designed for satellite TV tuning systems. It is a programming

variant of the SP5655 allowing the design of one tuner with

either I2C bus or a 3–wire bus format depending on which

device is inserted. The device when used with a varicap 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 contains five modes

of operation each compatible with Toshiba 18 and 19 bit

software.

The comparison frequencies are obtained from a crystal

controlled on–chip oscillator typically operating at 4MHz. The

comparator has a charge pump output amplifier stage around

which feedback may be applied. Only one external transistor

is required for varicap line driving.

FEATURES

J Complete 2.7GHz Single Chip System

J High Sensitivity RF Input

J Low power Consumption (5V, 30mA)

J On–Chip Oscillator with 1kW negative resistance

J On chip oscillator start–up circuit

J Programming Compatible with Toshiba TD6380,

TD6381 and TD6382#

J Pin compatible with SP5655#

J 5 Modes of Operation with different step sizes,

see Table 1; each selectable with 18 or 19 bit

transmission length.

J Single Port 18/19 Bit Serial Data Entry

J Auto select for Data transmission length, 18 or 19

J Low Radiation

J Phase Lock Detector

J Varactor Drive Amp Disable

J Charge Pump Disable

J Four Controllable Outputs

J ESD Protection [

# See notes on pin and programming compatibility

[ Normal ESD handling procedures should be

observed.

Fig. 1 Pin connections – top view

116

CHARGE PUMP

CRYSTAL

MODE SELECT

DATA

CLOCK

PORT P3

PORT P2

PORT P1

DRIVE OUTPUT

VEE

RF INPUT

VCC

LOCK

ENABLE

PORT P0

MP16

APPLICATIONS

J Satellite TV

J High IF Cable Tuning Systems

ORDERING INFORMATION

SP5654/KG/MPAS (Tubes)

SP5654/KG/MPAD (Tape and Reel)

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