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PGA302: PGA302 and PGA305

Sandro Alder
Prodigy 10 points
Part Number: PGA302
Other Parts Discussed in Thread: PGA305

My questions are about both parts PGA302 and PGA305

1.Is it possible to read out all 16Bit / 24Bit over the I2C Interface, or is that only possible over the 14 Bit DAC? 

2.Is it possible to calibrate these parts internally?

3.We would like to use an external Voltage for the Sensor as shown below. For the PGA 305 it is not clear where the Common Mode Input Voltage is. All i could find, was this table in the absolute max ratings.

  • 0
    TI__Mastermind 31655 points

    Hi Sandro,

    On the PGA305 you can read out compensated 24 bit data through the I2C using the I2C runtime commands. On the PGA302 you can only read out the raw ADC data.

    I'm not sure what is meant by calibrating the parts internally. The calibration is for the entire system, including the sensing element, so it will have to be done in the completed application. The coefficients used by the part to compensate the output have to be calculated externally using either the GUI or the coefficient calculation DLL.


    Your pictures seem to be missing, can you please reupload them? I can guess at what you're referring to, though. The PGA305 has a true differential input, so the common mode voltage does not matter as long as you do not exceed the single-ended voltage limits for the PGAIN inputs. These are specified in the datasheet under the PGAIN technical specifications.

    Regards,