SP5659
2·7GHz I2C Bus Low Phase Noise Synthesiser
Preliminary Information
Supersedes March 1996 version, DS4206-1.8
DS4296 - 2.0 June 1998
TheSP5659isasinglechipfrequencysynthesiserdesigned
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 FREF or the comparison frequency
FCOMP 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).
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CHARGE PUMP
CRYSTAL
REF/COMP
ADDRESS
SDA
DRIVE
V
EE
RF INPUT
RF INPUT
SP5659
V
CC
SCL
ADC
PORT P3
PORT P2
PORT P0
PORT P1
MP16
The synthesiser is controlled via an I2C 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 I2C bus.
The SP5659 also contains a varactor line disable and
charge pump disable facility.
Fig. 1 Pin connections – top view
■ ESD Protection: 4kV, Mil-Std-883C, Method 3015 (1)
■ Pin Compatible with SP5658
(1) Normal ESD handling precautions should be observed.
FEATURES
■ Complete 2·7GHz Single Chip System
■ Optimised for Low Phase Noise
■ Selectable 42 prescaler
APPLICATIONS
■ Satellite TV
■ High IF Cable Tuning Systems
■ Selectable Reference Division Ratio
THERMAL DATA
uJC = 41°C/W
uJA = 111°C/W
■
Selectable Reference/Comparison Frequency Output
■ Selectable Charge Pump Current
■ Varactor Drive Amplifier Disable
■ 5-Level ADC
ORDERING INFORMATION
SP5659 KG/MP1S (Tubes)
SP5659 KG/MP1T (Tape and reel)
■ Variable I2C BUS Address for Multi-tuner Applications