Sigma-Delta ADC from National Semiconductor

The ADC12EU050 from National Semiconductor, Santa Clara, CA, is an ultra low-power, octal, 50 Msps, 12-bit ADC with a continuous time architecture. Features include 8 channels; low-pass, brickwall anti-aliasing filter; alias-free sample bandwidth up to 25 MHz; total power consumption of 350 mW (operating from a 1.2 V supply); 70 dB SNR; 78 dB SFDR; 10.7 bits ENOB; 66 dB SINAD; and –70 dB THD. The ADC also includes an SPI-compatible interface. Applications include battery-powered portable systems, medical and industrial ultrasound, and communications.