Question
AD7124-8 Which power mode should I use?
Answer
Normally, the application dictates which power mode to use. Common applications
for the part are smart transmitters, process control input modules and low
power or battery operated instrumentation. For field transmitters, the maximum
current that can be used by the complete transmitter is 4 mA when the
transmitter is loop powered. Therefore, the less current consumed by the ADC,
the better, as it allows more current for the processor, etc. Therefore, the
AD7124-8 would be used in low power mode. For process control, current
consumption is not a concern so any power mode could be used. The benefits of
using the full power mode is that for a given output data rate, the rms noise
is lowest in the full power mode. Also, the part supports higher output data
rates in the full power mode. So, this allows the customer to increase the
number of channels sampled per second for a given level of performance.