The LTC2449 is an 8/16 channel, high speed, 24-bit DS ADC with ten selectable speed / resolution modes from 6.9Hz/200nVRMS to 3.5 kHz/25mVRMS. Key DC specifications include 5ppm INL, 5mV offset, 10ppm full-scale error and 20nV/°C offset drift. In the 6.9Hz/200nVRMS mode, input normal mode rejection of 50Hz and 60Hz noise is better than 87dB. The accuracy (offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. The LTC2449 performs autozeroing of the ADC by reversing the inputs through the multiplexer output / ADC input connections. This allows an external dual buffer amplifier to isolate the signal inputs from the sampling current of the ADC.