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ADC12D1800RF DESIQ Mode

mason moon
Prodigy 190 points

Hi,

I understood about DESIQ mode.

But, i wonder when DESIQ mode use.

What are the benefits of DESIQ mode?

 

- Customer : Nextwill (www.nextwill.com)

- App : Communication Equipment.

- Q'ty : 100 over.

- MP : Q3.2015

 

Thnaks & regards.

  • 0
    TI__Genius 13335 points

    Hello Mason,

    DESIQ mode essentially has more input bandwidth compared to DESI or DESQ modes, which can result in improved AC performance at higher input frequencies. 

    For DESI and DESQ modes a single input feeds both I and Q channel inputs which results in more loading on the mux and results in a slightly lower bandwidth.

    In DESIQ mode, both inputs are driven which reduces the loading which allows a little more bandwidth.

    Then there is another mode DESCLKIQ (only available in the ADC1xDxxxxRF devices) which disables the internal mux and allows both inputs to be externally driven for the maximum input bandwidth in DES mode.

    The tradeoff is for this mode is that it requires very well matched external routing. To learn more about the various modes, please refer to the following TI Design:

    Driving the GSPS ADCs in Single-Channel or DualChannel Mode for High Bandwidth Applications: http://www.ti.com/lit/ug/tidu175/tidu175.pdf