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ADS1120: Sampling rate at Turbo mode is 2kSPS

Expert 3040 points
Part Number: ADS1120

Hi my customer want to konw if the case of using 2ch differencial input, the max sampling rate is still 2kSPS at Turbo mode? 

Best Regards, NY

  • NY,

    Yes.  If you configure the mux (register 0) for differential input, configure operating mode for Turbo (register 1, MODE[1:0] = 10), and configure data rate DR[2:0] =110 register 1.  You will read a differential signal as 2ksps.  I hope this information is helpful to you.

    Best regards,

    Art 

  • Thank you so much for your reply. to be clarify, I mean if they use 2ch at the same time, sampling rate / channel will be limited by 1 ksps? 

    Because datasheet says that the device can perform conversions at data rates up to 2000 samples-per-second (SPS) with single-cycle settling.

    Best Regards, NY

  • NY,

    The ADC input is inherently a differential input.  When the ADC is in single-ended mode one of the inputs is connected to AVSS (i.e. GND) and the other is connected to the signal.  Thus, a differential input isn't really using two channels at the same time.  The term "single-cycle settling" means that the device will be able to convert accurately in one cycle, so if channels are switched you do not have to add additional settling time to get an accurate result.  You can purchase an EVM ( ADS1120EVM ) and confirm this operation as well as verify other capability of the device.  I hope this helps clarify the device operation.

    Best regards,

    Art