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ADS7028: Latency in analog channel switching

Part Number: ADS7028

Hi,

what is the latency or delay in case of switching from one analog channel to another channel both in manual and in Auto-Sequence Mode ?

Thanks.

  • Hi Yashay,

    Welcome to our e2e forum!  Figure 35 shows the device operation in manual mode.  SDI provides the next channel in the sequence (Switch to AINy).  The MUX switches with the next rising /CS and begins sampling AINy while converting the previous sample.  The conversion result are then presented on SDO in the next frame.  Figure 37 shows auto sequence mode.  You can get the selected channel conversion result in the second frame.  The overall latency (delay) is going to be dependent on your SCLK speed.

  • Thanks for your info BUT my question is related to the latency caused by switching from one analog channel to another analog channel ? 

  • Hi Yashay,

    Latency is normally considered as the time it takes to sample the input until you have the conversion results.  The actual time it takes to switch the MUX is on the order of nano seconds.  The time spend acquiring the input is from when the falling /CS to the next rising /CS as shown in Figure 35.  The conversion happens while /CS is high.  The MAX throughput is 1 MSPS, conversion time is 600nS, so Figure 35 shows ~1.6 uS delay assuming you are running full speed.