AR_BurstDur
ads->ds_ctl2 &= ~(AR_BurstDur);
ads->ds_ctl2 |= SM(burstDur, AR_BurstDur);
ads->ds_ctl2 &= ~AR_BurstDur;
ads->ds_ctl2 |= SM(burstDur + burstDuration, AR_BurstDur);