SP5768
SP5768
3.0 GHz Low Phase Noise Frequency Synthesiser
November 2004
Features
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Complete 3.0GHz single chip system
Optimised for low phase noise, with comparison
frequencies up to 4 MHz
No RF prescaler
Selectable reference division ratio
Reference frequency output
Selectable charge pump current
Integrated loop amplifier
Four switching ports
Low power replacement for SP5658 and 5668
Downwards software compatible with SP5658
ESD protection, (Normal ESD handling
procedures should be observed)
Ordering Information
SP5768/KG/MP1S (Tubes)
SP5768/KG/MP1T (Tape and Reel)
Description
The SP5768 is a single chip frequency synthesiser
designed for tuning systems up to 3.0GHz and is
optimized for low phase noise with comparison
frequencies up to 4 MHz.
The RF programmable divider contains a front end dual
modulus 16/17 functioning over the full operating range
and allows for coarse tuning in the upconverter
application and fine tuning in the downconverter.
Comparison frequencies are obtained either from a
crystal controlled on-chip oscillator or from an external
source. A buffered reference frequency output is also
available to drive a second SP5768.
The device also contains 4 switching ports.
Applications
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TV, VCR and Cable tuning systems
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Communications systems
REF
13 BIT
COUNT
RF INPUT
16/17
4 BIT
COUNT
REFERENCE
DIVIDER
CRYSTAL CAP
CRYSTAL
CHARGE PUMP
DRIVE
17 BIT LATCH
6 BIT LATCH
DATA
CLOCK
ENABLE
DATA
INTERFACE
5 BIT
LATCH & PORT/
TEST MODE
INTERFACE
PORT P0/OP
PORT P1/OC
PORT P2
PORT P3
Figure 1 - SP5768 block diagram
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2001-2004, Zarlink Semiconductor Inc. All Rights Reserved.
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