ADA4940 Fully Differential ADC Drivers Analog Devices Inc. ADA4940 Fully Differential ADC Drivers are low noise, low distortion differential amplifiers with very low power consumption. They are an ideal choice for driving low power, high resolution, high performance SAR and sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with resolutions up to 18 bits from dc to 1MHz on only 1.25mA of quiescent current.