Serial Bus as Communication Between Microcontroller and AD9824 for Multi Spectral Camera

A multispectral camera for LAPAN-A4 microsatellite will be developed using charge-coupled device (CCD) to capture image and 16 ADCs to convert the CCD's analog yields into digital signals. To connect the ADCs and the camera, design of embedded system connection is needed with microcontroller as the main processor and serial bus as the communication protocol. This research aims to integrate 16 ADCs of AD9824 with ATMega128 microcontroller using serial bus communication. Tests are conducted by using collimator and by executing different ADCs with different gain values, resulting in several images with distinctive characteristics. From the test data, the microcontroller can execute commands and make telemetry requests to ADCs. In addition, it can be seen that the maximum value of digital number of each image is different, ranging from 7934 to 9212, when each ADC is separately activated with maximum gain input value of 36 dB and the digital number reaches maximum value of 3581 when all ADCs are deactivated.