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SP5669 Datasheet(PDF) 1 Page - Mitel Networks Corporation |
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SP5669 Datasheet(HTML) 1 Page - Mitel Networks Corporation |
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1 / 15 page  Ordering Information SP5669/KG/MP1S (Tubes) SP5669/KG/MP1T (Tape and reel) 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 chargepump disable facility. Features q Complete 2.7GHz single chip system q Compatible with UK DTT offset requirements q Optimised for low phase noise q Selectable divide by two prescaler q Selectable reference division ratio q Selectable reference/comparison frequency output q Selectable charge pump current q Four selectable I2C bus address q 5–level ADC q Pin compatible with the SP5658 3–wire bus controlled synthesiser and SP5659 I2C bus synthesiser and SP5659 I2C bus synthesiser ESD protection; (Normal ESD handling procedures should be observed) Applications q Complete 2.7GHz single chip system q Optimised for low phase noise SP5669 2.7GHz I2C Bus Controlled Synthesiser Preliminary Information DS4852 - Issue 2.1 May 1999 Description 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. |
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