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ADC34J43: JESD204

Lolo
Prodigy 250 points
Part Number: ADC34J43
Other Parts Discussed in Thread: ADC3443

Hello,

In the ADC34J43 version, there is a digital gain option to set the FS swing between 1Vptp and 2Vptp with the registers at the addresses 02h to 05h.

If I'm selecting 1Vptp (digital gain = 6 dB), do the ENOB, SFDR and other ADC parameters stay the same ? the FS will be select to 1Vptp instead of 2Vptp.

Is the GUI also updated after the register change (I will see FUND level = 0 dBFS instead of -6dBFS) ?

Can I use those registers for the ADC3443 (no JESD version) ? and how ? because they are not displayed (hidden I assume) in the register map of the ADC3443.

Thanks for your support.

Lolo

  • 0
    TI__Intellectual 785 points

    Hi,

    Digital gain feature is available only in JESD version of devices.

    When you select digital gain feature, it gains up full spectrum of ADC by same amount. So a quantity expressed in dBc units remains unchanged (such as SFDR), whereas a quantity expressed in dBFS units changes by same amount (such as SNR, noise). ENOB is calculated based on SNR, so it also changes.

    Regards,

    Sourabh