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AD 8348

Discussion in 'Electronic Design' started by Dario, Nov 20, 2006.

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  1. Dario

    Dario Guest

    Hi to all newsgroup!
    Do someone use this demod developed by Analog Devices?
    I have evaluation board and I read datasheet, but I can't demod direct
    current... I tried many ways, like described in datasheet, but my eval
    board doesn't work correctly at 0 Hz.

    Any suggestion?

    Thanks a lot
  2. Guest

    What's your application? What analog information are you trying to
    extract? The datasheet states that this is a 50-100 MHz device, which
    doesn't include 0 Hz (DC).

    I haven't ever used Analog Devices demodulators, but I've been
    seriously investigating them for a possibility in a low frequency
    (30-500 kHz) application. According to,2879,770%5F849%5F0%5F%5F0%5F,00.html,
    the AD630 and AD8333 operate from DC to 2 Mhz and DC to 50 MHz,

    I'm not 100% familiar yet with the inner workings of a demodulator, but
    I do know that you have to have an AC signal in order to demodulate it,

    You also might check into devices like the AD606, AD8304/8307, etc.
    that are demodulating logarithmic amplifiers if you're interested in
    the amplitude only of your signal.

    Good luck!
  3. Dario

    Dario Guest

    Thank you Todd for your answer! I'm sorry because my question is not
    very clear...

    I need to demodulate a DVB channel from 800MHz to baseband. I filter I
    and Q baseband signals with a DSP to delete adiacent channels and I
    send it to a decoder. The problem is that baseband channel lacks of
    zero Hz frequency, so SNR is very poor. If I choose a different
    demodulation frequency (to bring DVB channel to higher frequency, about
    from 1MHz to 9 MHz), the SNR ratio is very good.

    So, in the ad8348 datasheet I read that it can demod a signal to DC,
    but I could not realise this... I tried several configurations, but
    Demod doesn't work.

    Maybe a scheme is clearer... I hope to post it soon.
    Thank you for your answer again.
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