JAJU878 November 2022 ADS117L11 , ADS127L11
The sensitivity of the sensor changes with the frequency of the acceleration excitation. The sensitivity is generally considered as being constant over a certain frequency range as defined by the minimum and maximum 3-dB frequencies. Beyond the maximum frequency, the sensor has a mechanical resonance frequency that must be avoided in an application. The usual frequency range is sub-Hz to 10 kHz, 20 kHz, or 30 kHz. The sensor interface circuit must have the same bandwidth of the targeted sensor and the ADC converter sampling frequency must be more than twice this bandwidth.
Note that the designer can extend the frequency range for some sensors by increasing the excitation current. For this reason, a variable current source is required for a versatile IEPE sensor interface circuit.