The microcontroller communicates with a host machine through an RS-485 interface. The AD9517 outputs are brought out to ten SMA connectors. ![]() The AD9517 phase-locks a United Microwave UMX-550 1.92 GHz PLL to the input reference clock. In addition, the microcontroller monitors the AD9517's status through several general-purpose I/O lines. The AD9517 is controlled by the ATmega16L through an SPI-compatible serial bus. An Analog Devices AD9517 Clock Generator chip is used to implement the clock generation and distribution functions. An Atmel ATmega16L microcontroller is the primary control device. The figure shows a block diagram of the clock generator. 4.11 Extra I/O from Modbus/RTU interface subassembly. ![]()
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