How to start a ADC conversion on the AD7124-8-ADC

Hi, Stefan.

Once all the necessary settings was done and a single conversion mode is selected, the ADC will power up, automatically sequences through the enabled channels and performs the single conversion on each selected channel. Thus, the ADC will select the first channel and begins conversion. The conversion requires the complete settling time of the filter. The conversion result is placed in the data register and /RDY goes low as soon as the conversion is available. The ADC then selects the next channel and performs conversion. You can read the present conversion while the next conversion is being performed. Make sure that you read the present conversion before the next conversion is complete, since the data register is updated. It is advisable to include the status register in reading the output to indicate the channel to which the conversion corresponds. You can do this by setting DATA_STATUS bit to 1 in the ADC_CONTROL register. When the ADC has performed a single conversion on each of the selected channels, it returns to idle mode.

Alternatively, you can also used the /SYNC pin to initiate a conversion. When /SYNC is taken high the ADC begins sampling/starts conversion and the falling edge of /RDY indicates when the conversion is complete and data is ready to read.

You can also refer to CN0381 reference circuit for 4-wire RTD application. http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0381.pdf

Thanks,

Jellenie

Hi, Stefan.

Once all the necessary settings was done and a single conversion mode is selected, the ADC will power up, automatically sequences through the enabled channels and performs the single conversion on each selected channel. Thus, the ADC will select the first channel and begins conversion. The conversion requires the complete settling time of the filter. The conversion result is placed in the data register and /RDY goes low as soon as the conversion is available. The ADC then selects the next channel and performs conversion. You can read the present conversion while the next conversion is being performed. Make sure that you read the present conversion before the next conversion is complete, since the data register is updated. It is advisable to include the status register in reading the output to indicate the channel to which the conversion corresponds. You can do this by setting DATA_STATUS bit to 1 in the ADC_CONTROL register. When the ADC has performed a single conversion on each of the selected channels, it returns to idle mode.

Alternatively, you can also used the /SYNC pin to initiate a conversion. When /SYNC is taken high the ADC begins sampling/starts conversion and the falling edge of /RDY indicates when the conversion is complete and data is ready to read.

You can also refer to CN0381 reference circuit for 4-wire RTD application. http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0381.pdf

Thanks,

Jellenie