Simple DSP interface for ADS784x/834x ADCs

摘要

The 12-bit ADS7841 and 16-bit ADS8341/3 are pin-compatible, 4-channel analog-to-digital converters (ADCs) with a synchronous serial interface. Typical power dissipation is 2 mW at a 200-kHz throughput rate on the ADS7841 and 8 mW at 100 kHz on the ADS8341/3. The 12-bit ADS7844 and 16-bit ADS8344 are pin-compatible, 8-channel ADCs with the same typical power requirements as their 4-channel cousins. The low power, high-speed, and onboard multiplexer of these devices make them ideal for battery-operated systems such as personal digital assistants, portable multichannel data loggers, and measurement equipment. The datasheets for these devices show various ways to interface the parts to microcontrollers with a serial peripheral interface (SPI), but they do not mention how to use these parts with high-performance digital signal processors (DSPs). This article provides an easy way to connect these parts with any Texas Instruments (Tl) DSP that contains at least one multichannel buffered serial port (McBSP). The information here pertains to the TMS320F2812 and all devices in the TMS320C5000™ and TMS320C6000™ DSP platforms.