SP5659
2·7GHz I
2
C Bus Low Phase Noise Synthesiser
Preliminary Information
Supersedes March 1996 version, DS4206-1.8
DS4296 - 2.0 June 1998
The SP5659 is a single chip frequency synthesiser designed
for tuning systems up to 2·7GHz.
The RF preamplifier drives a divide-by two prescaler which
can be disabled for applications up to 2GHz, allowing direct
interfacing with the programmable divider, resulting in a step
size equal to the comparison frequency. For applications up
to 2·7GHz the divide-by two is enabled to give a step size of
twice the comparison frequency.
The comparison frequency is obtained either from an on-
chip crystal controlled oscillator or from an external source.
The oscillator frequency F
REF
or the comparison frequency
F
COMP
may be switched to the REF/COMP output; this feature
is ideally suited to providing the reference frequency for a
second synthesiser such as in a double conversion tuner (see
Fig. 5).
The synthesiser is controlled via an I
2
C bus and responds
to one of four programmable addresses which are selected by
applying a specific voltage to the Address input. This feature
enables two or more synthesisers to be used in a system.
The SP5659 contains four switching ports, P0-P3 and a
5-level ADC, the output of which can be read via the I
2
C bus.
The SP5659 also contains a varactor line disable and
charge pump disable facility.
CHARGE PUMP
CRYSTAL
REF/COMP
ADDRESS
SDA
SCL
PORT P3
PORT P2
1
2
3
4
5
6
7
8
16
15
14
13
DRIVE
V
EE
RF INPUT
RF INPUT
V
CC
ADC
PORT P0
PORT P1
SP5659
12
11
10
9
MP16
Fig. 1 Pin connections – top view
s
ESD Protection: 4kV, Mil-Std-883C, Method 3015
(1)
s
Pin Compatible with SP5658
(1) Normal ESD handling precautions should be observed.
FEATURES
s
s
s
s
s
s
s
s
s
Complete 2·7GHz Single Chip System
Optimised for Low Phase Noise
Selectable
42
prescaler
Selectable Reference Division Ratio
Selectable Reference/Comparison Frequency Output
Selectable Charge Pump Current
Varactor Drive Amplifier Disable
5-Level ADC
Variable I
2
C BUS Address for Multi-tuner Applications
APPLICATIONS
s
Satellite TV
s
High IF Cable Tuning Systems
THERMAL DATA
u
JC
= 41°C/W
u
JA
= 111°C/W
ORDERING INFORMATION
SP5659 KG/MP1S
(Tubes)
SP5659 KG/MP1T
(Tape and reel)
MITEL [ MITEL NETWORKS CORPORATION ]
