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Daisy-chain DDC118 and DDC112

Leandro Meier
Prodigy 10 points
Other Parts Discussed in Thread: DDC118, DDC114

Hi

We are working on a medical diagnosis device with an optical analysis system. We use 12 photodiodes and will have to measure currents in the fA rage.
Is it possible to daisy-chain a DDC118 and a DDC114 or would you reccomend to use three daisy-chained DDC114.

Best Regards

Leandro

  • 0
    TI__Guru 65190 points
    Leandro,

    Thanks for contacting us. I am the medical applications support for the DDC devices.

    You should be able to chain together the DDC118 and DDC114 but the issue then would be difficulty in the data readout and similar. For applications like this we usually tie DCLK together for all devices in the chain and you would need to be sure that you pay close attention that you would need to clock the DDC118 more than the DDC114 since the 8 would be giving you twice the channels.

    The two devices are based off the same silicon and have the same specs so that should help if you do decide to use one of each device.

    Once you make a design you can forward it to us and we can let you know our thoughts.

    Regards,

    -Adam