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Mixer-LT5512, LT5526, LT5560, LTC5562


I have RF input signal from 300 kHz to 12 GHz, and IF is 20 MHz. One of the design requirements is active mixer as we want a low LO drive.The frequency conversion will be split into 2 mixers, one covers 300 kHz to about 3 to 4 GHz, and the second one covers from there to 12 GHz. For the first mixer having RF input from 300 kHz to 3/4 GHz, it will need to perform up and downconversion together as the IF is 20 MHz. 


When I looked through the catalogue from ADI, some mixers are labelled as downconverting, while others are "downconverting, upconverting". For example:

LT5512, LT5526 - Downconverting mixer

LT5560, LTC5562 - Downconverting mixer, Upconverting mixer

So, are any of these mixers able to perform both up and downconversion in a single circuit?

  • As long as your application RF/LO/IF frequencies are within the active mixer's specified RF/LO/IF frequency ranges, it can be used as either upmixer or downmixer. However, many of our mixer products have on-chip baluns which have limited frequency range and in turn limit the mixers' usage as only upmixers or downmixers.

    The 4 mixers you identified do not have on-chip balun, and all can be used for either upconversion or downconversion.

    For your particular application, I would recommend LTC5510 for the 1st mixer, and LTC5548/LTC5549 for the 2nd mixer.

    The LTC5510 is a wideband active mixer.

    The LTC5548/LTC5549 are wideband passive mixer with on-chip LO buffer and require only 0dBm LO drive.

  • Hi Shsiao,

    The recommended LTC5510 is spec'ed from 1 MHz to 6 GHz, is it able to support range of 300 kHz to 12 GHz?

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