SP5768 Datasheet, PDF (1/10 Pages) Zarlink Semiconductor Inc – 3.0 GHz Low Phase Noise Frequency Synthesiser

SP5768
SP5768
3.0 GHz Low Phase Noise Frequency Synthesiser
Features
• 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)
Applications
• TV, VCR and Cable tuning systems
• Communications systems
November 2004
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.
RF INPUT
16/17
4 BIT
COUNT
13 BIT
COUNT
REFERENCE
DIVIDER
17 BIT LATCH
6 BIT LATCH
REF
CRYSTAL CAP
CRYSTAL
CHARGE PUMP
DRIVE
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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