SP5669_97 Datasheet, PDF (1/12 Pages) Mitel Networks Corporation – 2.7GHz I2C Bus Controlled Synthesiser

SP5669
2.7GHz I²C Bus Controlled Synthesiser
Preliminary Information
DS4852 - 1.4 November 1997
The SP5669 is a single chip frequency synthesiser
designed for tuning systems up to 2.7GHz and offers step size
compatible with DTT offset requirements.
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 so enabling a step
size equal to the comparison frequency. For applications up to
2.7GHz the divide by two is enabled, giving 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. 8).
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 device contains four switching ports P0–P3 and a
5–level ADC. The output of the ADC can be read via the I ² C
bus.
The device also contains a varactor line disable and charge
pump disable facility.
FEATURES
s Complete 2.7GHz single chip system
s Compatible with UK DTT offset requirements
s Optimised for low phase noise
s Selectable divide by two prescaler
s Selectable reference division ratio
s Selectable reference/comparison frequency output
s Selectable charge pump current
s Four selectable I²C bus address
s 5–level ADC
s Pin compatible with the SP5658 3–wire bus
controlled synthesiser and SP5659 I²C bus
synthesiser and SP5659 I²C bus synthesiser
s ESD protection; (Normal ESD handling
procedures should be observed)
CHARGE PUMP
CRYSTAL
REF/COMP
ADDRESS
SDA
SCL
PORT P3
PORT P2
1
16
DRIVE
2
15
Vee
3
14
RF INPUT
4
13
RF INPUT
5
12
Vcc
6
11
ADC
7
10
PORT P0
8
9
PORT P1
Fig.1 Pin connections - top view
APPLICATIONS
s Complete 2.7GHz single chip system
s Optimised for low phase noise
ORDERING INFORMATION
SP5669/KG/MP1S (Tubes)
SP5669/KG/MP1T (Tape and reel)
MP16
APPLICATIONS
s SAT, TV, VCR and Cable tuning systems