SP5848 datasheet(2/10 Pages) ZARLINK

2 / 10 page

SP5848

Preliminary Information

Features

•

Dual independent PLL frequency synthesisers in a

single package, optimised for double conversion

cable tuners, offering improved application

•

2.2GHz up-synthesiser optimised for low phase

noise up to comparison frequencies of 4MHz

•

1.3GHz down-synthesiser optimised for low phase

noise AND small step size

•

Common reference oscillator and divider with

independently selectable ratios for each

synthesiser

•

10:1 programmable charge pump current ratio in

up synthesiser

•

3-Wire bus programmable, each synthesiser

indepently addressable

•

Low power consumption, typ 100mW at 5V

•

ESD protection, (Normal ESD handling

procedures should be observed)

Applications

•

TV, VCR, and cable tuning systems

Description

The SP5848 is a dual PLL frequency synthesizer

controlled by a 3-wire bus optimised for application in

double conversion tuners.

Each synthesiser loop within the SP5848 is

independently addressable and contains an RF

programmable divider, phase/frequency detector and

charge pump/loop amplifier section; a common

reference frequency oscillator and divider chain is

provided, whose ratios for each loop are independently

programmable.

Both synthesisers are optimised for low phase noise

performance and in addition synthesiser 2 is capable of

operation with a low comparison frequency.

RF1 INPUT

16/17

4 BIT

COUNT

11 BIT

COUNT

15 BIT LATCH

2 BIT

LATCH

PORT P0

PUMP 1

DRIVE 1

16 BIT LATCH

DATA

CLOCK

ENABLE

DATA

INTERFACE

RF 2 INPUT

16/17

4 BIT

COUNT

12 BIT

COUNT

1 BIT

LATCH

2 BIT

LATCH

5 BIT

LATCH

DIVIDE

PORT P1

PUMP 2

DRIVE 2

Figure 1 - Block Diagram

DS5076

ISSUE 1.6

October 1999

Ordering Information

SP5848/KG/QP1S

SP5848/KG/QP1T

SP5848

2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL

Preliminary Information

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