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ADF4212L power up sequence through rate

Hi,

As a local distributor, our customer is facing to error when starting up ADF4212L. By studying in the customer's side, they found VDD1=VDD2=3.3V might be a cause when it relatively slow / long ramp-up period, as shown in below at yellow line indicates.

It seems there is no description defined in datasheet in regard to power up, so if you provide required specification how long, how fast, how steep or any to achieve normal start up of this PLL device. Other words, the customer may be able to see good result when shorten above ramp-up period, but feeling needs to confirm what is defined power up sequences.

Any of your comments or supports would be very much appreciated.

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  • Hi Grzegorz Wawrzola,

     

    Thank you very much for your reply and sorry for my shortage. I understand

    your point what type of error is key to care.

    However, the first question of the customer is quite simple that,

     

    Does ADF4212L have any specification of power up sequence/timing ? If it

    has, please provide.

     

    The customer has experienced to use same device, ADF4212L, on existing

    products without any problem, and now try to adopt on another new products.

    So, they are not amateur of this device and also other Analog Devices

    products.

    But their new products have different power supply, as I attached waveform,

    than previous products, and gets a error which PLL is not locked at IF side,

    after starting up.

    When it occurs, CP(charge pump) output stay and stuck to +5V, as same

    voltage as Vp1 and Vp2.

    They confirmed sending command from host MCU after power becoming

    suffuciently stable.

    Once ADF4212L becomes to be a state which is not locked, it can not be

    recovered even though resending host command again.

    Only the way to recover is, powering down on the device and power on again.

    Because it seems issue on starting of ADF4212L, the customer doubt their

    power supply may be out of specification.

     

    The customer can not recreate this issue at all times. They say it sometimes

    occurs.

    As I wrote before, when trying to make this power ramp-up period more short,

    they feel it becomes to be improved,

    however, because they can NOT recreate the issue everytime, they need to

    confirm the specification of starting power supply on ADF4212L.

    This is reason why of their question.

     

    Best Regards.

Reply
  • Hi Grzegorz Wawrzola,

     

    Thank you very much for your reply and sorry for my shortage. I understand

    your point what type of error is key to care.

    However, the first question of the customer is quite simple that,

     

    Does ADF4212L have any specification of power up sequence/timing ? If it

    has, please provide.

     

    The customer has experienced to use same device, ADF4212L, on existing

    products without any problem, and now try to adopt on another new products.

    So, they are not amateur of this device and also other Analog Devices

    products.

    But their new products have different power supply, as I attached waveform,

    than previous products, and gets a error which PLL is not locked at IF side,

    after starting up.

    When it occurs, CP(charge pump) output stay and stuck to +5V, as same

    voltage as Vp1 and Vp2.

    They confirmed sending command from host MCU after power becoming

    suffuciently stable.

    Once ADF4212L becomes to be a state which is not locked, it can not be

    recovered even though resending host command again.

    Only the way to recover is, powering down on the device and power on again.

    Because it seems issue on starting of ADF4212L, the customer doubt their

    power supply may be out of specification.

     

    The customer can not recreate this issue at all times. They say it sometimes

    occurs.

    As I wrote before, when trying to make this power ramp-up period more short,

    they feel it becomes to be improved,

    however, because they can NOT recreate the issue everytime, they need to

    confirm the specification of starting power supply on ADF4212L.

    This is reason why of their question.

     

    Best Regards.

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