SBAS683B August 2014 – May 2020 ADS1120-Q1
PRODUCTION DATA.
Normal mode is the default mode of operation after power-up. In this mode, the internal modulator of the ΔΣ ADC runs at a modulator clock frequency of f(MOD) = f(CLK) / 16, where the system clock (f(CLK)) is either provided by the internal oscillator or the external clock source. The modulator frequency is 256 kHz when using the internal oscillator. Normal mode offers output data rate options ranging from 20 SPS to 1 kSPS with the internal oscillator. The data rate is selected by the DR[2:0] bits in the configuration register. In case an external clock source with a clock frequency other than 4.096 MHz is used, the data rates scale accordingly. For example, using an external clock with f(CLK) = 2.048 MHz yields data rates ranging from 10 SPS to 500 SPS.