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ADC124S051: Conversion time of ADC124S051

Zhanpeng Li
Intellectual 2130 points
Part Number: ADC124S051

Hi team,

we would like to know the conversion time of ADC124S051. How long will this device need from sampling date to send date through SPI?

How to calculate this spec?

BR

Brandon

  • 0
    TI__Mastermind 24940 points

    Hello, 

    This device has a conversion rate of 16 SCLK, within these 16 clock pulses, the device goes through the track mode(sample mode, 3 SCLK pulses) and hold mode (conversion mode 13 SCK pulses). 

    The sampling rate is based on the SCLK rate. To achieve the highest sampling rate, the highest SCLK rate is needed. 

    example, to achieve 500ksps, you need 16 SCLK pulses to occur in that period. since this is Hz, you multiply = 500Khz * 16 = 8Mhz SCLK rate

    This can be done in seconds. The desired sampling rate is 2us, you need 16 SCLK pulses to occur in that time, thus you divide = 2 us / 16 = 125ns

    This device has a one conversion latency. Meaning, in Frame N, the user configures the device to sample channel 3. In frame N+1, the output data from channel 3 is available. 

    Regards

    Cynthia

  • 0 in reply to Cynthia
    TI__Intellectual 2130 points

    Hi Cynthia,

    is that true that the 2us is the value we need?  on the other hand,  how could we understand the one conversion latency. and how to calculate the time that when change the channel.

    BR

    Brandon

  • 0 in reply to Zhanpeng Li
    TI__Mastermind 24940 points

    Brandon, 

    The 2us was based on an example to explain how to solve for the SCLK frequency.

    Based on your application need, the sampling rate can be different. You will need to decide on the sampling frequency needed to meet your application requirements. 

    The one conversion latency, in time will be same as your sampling rate.  For this I would suggest not thinking about it as time in seconds, but as conversion cycle. Meaning, you program the device in Frame N, then the device will sample and output the data in Frame N+1. 

    if you would like to think of as time, then it would be the sampling rate that the device uses. One conversion cycle = 1/sampling rate

    Regards

    Cynthia