Radio communication evaluation / development kit
CML Microcircuits

The EV8500 EvKit comprises a single board containing a CMX850 Communications Controller (80C51 core and V.22 bis Modem IC), line interface components and a serial communications port for interfacing to a PC. Firmware is provided to implement a standard 'AT' commands interface which is used to control the evaluation board via a standard terminal emulator. PC software is provided to support serial downloading of firmware updates to the evaluation kit.

The board is powered from a single 3 to 3.6 V power supply. Removal of jumpers allows the user to measure device current. Important signals can be monitored via test points and header pins.

The evaluation board has a 2-wire line interface to provide line matching and dc isolation.
This 2-wire interface is connected to the line using an OptoMOS relay.
Where components are telco-specific (line impedance, line protection, etc.) space is provided for the user to add appropriate components.