This application note explains how to interface an AD7676 analog-to-digital (ADC) converter in master serial mode (internal discontinuous clock) with SHARC® ADSP-21065L processors. This application note also provides example code to demonstrate how to program the ADSP-21065L processor's serial port to receive data from the AD7676 converter when the AD7676 is configured in master serial mode.
This document provides technical guidance on interfacing Analog Devices AD7676 analog-to-digital converters (ADCs) with ADSP-21065L SHARC processors. It specifically covers the configuration of the AD7676 in master serial mode with an internal discontinuous clock to supply data to the processor's serial port.
The note details the signal connections, timing requirements, and software implementation using assembly language. It includes example code for the ADSP-21065L to demonstrate how to program the Serial Port (SPORT) to receive 16-bit data from the ADC, handling the initial dummy reads required for the interface to function correctly.
| Resolution | 16-bit |
|---|---|
| Sampling Rate | 500 kSPS |
| Architecture | Charge-redistribution SAR |
| Power Supply | 5 V |
| Max Power Dissipation | 67 mW |
| Power-down Current | 7 µW |
| Integral Non-Linearity (INL) | 1.0 LSB |
| Signal-to-Noise Ratio (SNR) | 92 dB minimum |
The AD7676 transfers 16-bit digitized data to the processor.
The example interface uses the ADSP-21065L SHARC processor.