DC846A

DC846A is a demonstration circuit for the LTC2447 24bit high speed 8-channel delta sigma ADC with selectable multiple reference inputs. Key DC specifications of LTC2447 include 5ppm INL, 5μV 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 LTC2447 also has four reference inputs dedicated to the four differential input channels and corresponding pairs of single-ended input channels. The LTC2447 performs autozeroing of the ADC by chopping the inputs through the multiplexer outputs. This allows an external dual buffer amplifier to isolate the signal inputs from the sampling current of the ADC inputs. DC846A is designed to allow easy evaluation of the LTC2447.

• Member of QuikEval™ family of demonstration boards