SP5848 Datasheet, PDF (1/9 Pages) Mitel Networks Corporation – 2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL

Preliminary Information
SP5848
SP5848
2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL
Preliminary Information
DS5076
Issue 1.6
October 1999
Features
G Dual independent PLL frequency synthesisers in a
single package, optimised for double conversion
cable tuners, offering improved application
G 2.2GHz up-synthesiser optimised for low phase
noise up to comparison frequencies of 4MHz
G 1.3GHz down-synthesiser optimised for low phase
noise AND small step size
G Common reference oscillator and divider with
independently selectable ratios for each
synthesiser
G 10:1 programmable charge pump current ratio in up
synthesiser
G 3-Wire bus programmable, each synthesiser
indepently addressable
G Low power consumption, typ 100mW at 5V
G ESD protection, (Normal ESD handling procedures
should be observed)
Applications
Ordering Information
SP5848/KG/QP1S
SP5848/KG/QP1T
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.
G TV, VCR, and cable tuning systems
RF1 INPUT
DATA
CLOCK
ENABLE
RF 2 INPUT
16/17
11 BIT
COUNT
4 BIT
COUNT
DATA
INTERFACE
15 BIT LATCH
16 BIT LATCH
2 BIT
LATCH
1 BIT
LATCH
2 BIT
LATCH
5 BIT
LATCH
2⁹ DIVIDE
16/17
4 BIT
COUNT
12 BIT
COUNT
Figure 1 Block Diagram
PUMP 1
DRIVE 1
PORT P0
PORT P1
PUMP 2
DRIVE 2
1