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ADC128D818: ADC128D818

VARSHINI RAMESH
Prodigy 20 points

Part Number: ADC128D818

We are using ADC128D818 for converting output of the sensor to digital.

        1 .Whether this chip has internal sample and hold  circuit. And it will control the sampling when it is needed?.

        2. Here ADC128D818 has internal temperature sensor.

  •  Is this sensor will monitor  the temperature of the board , junction or temperature of the external environment?

       3. The output data is stored in registers. Suppose if I want the data after  some time  whether it can be read from the registers without doing the conversion again?.

Varshini.

  • 0
    TI__Guru** 100225 points
    Varshini,


    I'm not sure what you had in mind when you asked if the device would control the sampling, but the ADC128D818 does not have a sample and hold.

    The internal temperature sensor is integrated into the die of the device. It is likely a temperature measurement based on a voltage based on diodes, mismatched in size and driving current to create a PTAT voltage. This temperature sensor will measure the junction of the die.

    The output data should stay on the channel readings register until the next conversion completes. This might be if you're using the one-shot conversion from the register setting in 09, but I don't think this will be helpful if you're using some sort of continuous conversion.

    Let me know if that helps clear things up. If I've missed something, post back with additional questions.


    Joseph Wu