The MC145073 is a dualchannel, 16bit A/D converter intended for use in digital audio systems such as multimedia, DCC, DAT, and professional audio applications. It uses a sigmadelta architecture consisting of a secondorder analog modulator and two stages of digital filtering for each channel. The analog modulator samples the input signal at 128 times the output data rate, performs a singlebit quantization, and shapes the quantization noise towards higher frequencies. Subsequent onchip digital filters reject most of the shaped quantization noise and lower the data rate. Sixteen unique userselectable interfacing modes make the MC145073 compatible with a multitude of application interfacing requirements. A single 5 V supply and a powerdown mode reduce power supply requirements, making the part attractive for portable applications.