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ADF4110 Channel Spacing

Hi,

I am using the ADF4110's N Counter with the Dual Modulus Prescalar as a Programmable Divider. The input frequency from the VCO varies from 1MHz to 32MHz (square). I should produce a 500Hz output from the ADF4110 at phase locked condition at all frequencies.

1. The input square wave has an amplitude of 2V. I need to square up the input as sharp as possible to achieve the slew rate required by the ADF4110's input. Please suggest a good comparator that would do the same...?

2. The Channel spacing of my system is 1KHz. Could I achieve this through the ADF4110 at all input frequencies...?

Regards,

YSVenu

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  • Hello ,

    I will send you on a reference circuit using the ADCMP553 later today/tomorrow....looking at the circuit, the o/p stage will be similar to the ADCLK905 reference circuit that I sent you ( using a single 3.3Volts supply voltage). The input will be similar to fig 21, page 13 of the ADCMP553 datasheet. With reference to fig 21, Vin will be your clock source which you can ac couple to a 50 ohm load which is biased at mid supply ( 1.5Volts approx) before connection to the ADCMP553 . The Vref pin is your bias voltage, and again this should present a 50ohm source to the ADCMP553.

    Regards,

    Brigid.

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  • Hello ,

    I will send you on a reference circuit using the ADCMP553 later today/tomorrow....looking at the circuit, the o/p stage will be similar to the ADCLK905 reference circuit that I sent you ( using a single 3.3Volts supply voltage). The input will be similar to fig 21, page 13 of the ADCMP553 datasheet. With reference to fig 21, Vin will be your clock source which you can ac couple to a 50 ohm load which is biased at mid supply ( 1.5Volts approx) before connection to the ADCMP553 . The Vref pin is your bias voltage, and again this should present a 50ohm source to the ADCMP553.

    Regards,

    Brigid.

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