Lowest Phase Noise PLL Synthesizer Using Fractional-N Technology

  
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The ADM1066 is a configurable supervisory/sequencing device that offers a single-chip solution for supply monitoring and sequencing in multiple-supply systems. In addition to these functions, the ADM1066 integrates a 12-bit ADC and six 8-bit voltage output DACs These circuits CAN be used to implement a closed-loop margining system that enables sup
Lowest Phase Noise PLL Synthesizer Using Fractional-N Technology - schematic

ply adjustment by altering either the feedback node or reference of a dc-to-dc converter using the DAC outputs. Supply margining CAN be performed with a minimum of external components. The margining loop CAN be used for in-circuit testing of a board during production (for example, to verify the boards functionality at -5% of nominal supplies), or CAN be used dynamically to accurately control the output voltage of a dc-to-dc converter. The device also provides up to 10 programmable inputs for monitoring under, over, or out-of-window faults on up to 10 supplies. In addition, 10 programmable outputs CAN be used as Logic enables. Six of these programmable outputs CAN also provide up to a 12 V output for driving the Gate of an N-channel FET that CAN be placed in the path of a supply. The device is controlled via configuration data that CAN be programmed into an EEPROM The whole configuration CAN be programmed using an intuitive GUI-based software package provided by Analog Devices, Inc.



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