Single-Supply 16-Bit (Sigma Delta) Stereo ADC

The AD1877 is a stereo, 16-bit oversampling ADC based on Sigma Delta technology. This part is intended primarily for digital Audio applications requiring a single 5 V power supply. Each single-ended channel consists of a fourth-order one-bit noise shaping Modulator and a digital decimation Filter An on-chip Voltage Reference stable over temperature and time, defines the full-scale range for both channels. Digital output data from both channels are time-multiplexed to a single, flexible serial Interface The AD1877 accepts a 256 FS or a 384 FS input Clock and operates in both serial port "master" and "slave" modes. In slave mode, all Clocks must be externally derived from a common source. The flexible serial output port, which is configured with pin selections, produces data in two s-complement, MSB-first format. The input and output signals are TTL-compatible. Each 16-bit output word of a stereo pair CAN be formatted within a 32-bit field of a 64-bit frame as either right-justified, I2S-compatible, Word Clock controlled or left-justified positions. Both 16-bit samples CAN also be packed into a 32-bit frame, in left-justified and I2S-compatible positions. The AD1877 is fabricated on a single monolithic integrated circuit using a 0.8 m CMOS double polysilicon, double metal process, and is offered in a plastic 28-lead SOIC package. Analog and digital supply connections are separated to isolate the Analog circuitry from the digital supply and reduce digital crosstalk. The AD1877 operates from a single 5 V power supply over the temperature range of 0C to +70C, and typically consumes less than 260 mW of power. For more information on ADI's Audio Portfolio, visit the Audio Solutions home page.
By Analog Devices, Inc.