Analog Devices ADAU1797 Quad ADCs combine four high-performance analog-to-digital converters (ADCs) with direct-coupled inputs capable of 10Vrms. The ADAU1797 implements multibit sigma-delta (Σ-Δ) architecture with a continuous time front end for low EMI. The devices can be directly connected to the electret microphone (ECM) and produce the bias for powering the microphone.
