SP5659 View Datasheet(PDF) - Mitel Networks
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SP5659 Datasheet PDF : 12 Pages
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DOUBLE CONVERSION TUNER SYSTEMS
The high 2·7GHz maximum operating frequency and excellent
noise characteristics of the SP5659 allow the construction of
double conversion high IF tuners.
A typical as shown in Fig. 5 uses the SP5659 as the first local
oscillator control for full band up conversion to an IF of greater
SP5659
than 1GHz. The wide range of reference division ratios allows the
SP5659 to be used for both the up converter local oscillator with
a high phase comparison frequency (hence low phase noise)
and the down converter which uses the device in a lower
comparison frequency mode, which gives a fine step size.
50-900MHz
1650-2700MHz
FIRST LO
1·6GHz
SP8659
REFERENCE CLOCK
SECOND LO
38·9MHz
SP8659
Fig. 5 Example of double conversion from VHF/UHF frequencies to TV IF
4MHz 18p
1
2 SP5659
3
Optional application using on-chip
crystal controlled oscillator
CONTROL
MICRO
10n
REF
ADDRESS
SDA
SCL
REF/COMP
P3
P2
130V
15n
1
16
2
15
3
14
4
13
SP5659
5
12
6
11
7
10
8
9
68p
13·3k
22k
16k
47k
2·2n
BCW31
1n
1n
OSCILLATOR OUTPUT
15V
10n
ADC
P0
P1
112V
TUNER
Fig. 6 Typical application
APPLICATION NOTES
An application note, AN168, is available for designing with
synthesisers such as the SP5659. It covers aspects such as loop
filter design and decoupling.
The application note is published in the Mitel Semiconductor
Media IC Handbook. A generic test/demonstration board has
been produced, which can be used for the SP5659. A circuit
diagram and layout for the board are shown in Figs. 7 and 8.
The board can be used for the following purposes:
(A) Measuring RF sensitivity performance
(B) Indicating port function
(C) Synthesising a voltage controlled oscillator
(D) Testing external reference sources
The programming codes relevant to these tests are given in
Fig. 3.
7
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