Hi i am using nrf52840 DK and
utilizing ble and adc functions
i configured my adc in my project as below
channel_config0.reference = NRF_SAADC_REFERENCE_INTERNAL; //Set internal reference of fixed 0.6 volts
channel_config0.gain = NRF_SAADC_GAIN1_6;
channel_config0.acq_time = NRF_SAADC_ACQTIME_10US;
channel_config0.mode =NRF_SAADC_MODE_DIFFERENTIAL; (0V) internally.
channel_config0.pin_p = NRF_SAADC_INPUT_AIN0;
channel_config0.pin_n = NRF_SAADC_INPUT_AIN2;
channel_config0.resistor_p = NRF_SAADC_RESISTOR_DISABLED;
channel_config0.resistor_n = NRF_SAADC_RESISTOR_DISABLED;
channel_config0.burst = NRF_SAADC_BURST_ENABLED;
1. from above configuration, i will get the difference between AIN0 and AIN2 right?
2. if so, what is the negative headroom for this configuration?
i have tested with gain=1/3 and 1Vpp sin wave and
below -0.3V, my output showed some kind of distorted wave form( inaccurate )
i know when gain=1/6 for single ended, input range is 0~3.6V
does it mean that for differential mode -1.8V ~ 1.8V?
if not, what is the range?
