DC979A

DC979A is a demonstration circuit for the LTC2442 24bit high speed 4-channel delta sigma ADC with integrated amplifier. The LTC®2442 is a 2-/4-channel, high speed, 24bit ΔS ADC with ten selectable speed/resolution modes from 6.9Hz/200nVRMS to 3.5kHz/25μVRMS. Key DC specifications include 4ppm maximum INL, 5μV offset, 10ppm full-scale error and 20nV/°C offset drift. In the 6.9Hz/200nVRMS mode, an 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 LTC2442 incorporates rail-to-rail buffer amplifiers for true high impedance inputs. DC979A is designed to allow easy evaluation of the LTC2442 and may be connected directly to the target application’s analogue signals while using the DC590 USB serial controller board and supplied software to measure performance.

• Member of QuikEval™ family of demonstration boards