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SP5659MP1S Datasheet(PDF) 7 Page - Mitel Networks Corporation |
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SP5659MP1S Datasheet(HTML) 7 Page - Mitel Networks Corporation |
7 / 12 page 7 SP5659 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 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 SP8659 SP8659 SP8659 SP8659 REFERENCE CLOCK FIRST LO SECOND LO 1650-2700MHz 1·6GHz 38·9MHz Fig. 5 Example of double conversion from VHF/UHF frequencies to TV IF BCW31 2·2n 47k 16k TUNER SP5659 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1n 1 30V 22k 1n OSCILLATOR OUTPUT 1 5V 10n ADC P0 P1 1 12V 68p 13·3k 15n P3 P2 REF/COMP 10n CONTROL MICRO REF ADDRESS SDA SCL SP5659 1 2 3 4MHz 18p Optional application using on-chip crystal controlled oscillator 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. |
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