EV8680 Datasheet, PDF (1/39 Pages) CML Microcircuits – Evaluation Kit

EV8680
Evaluation Kit
User Manual
UM8680/2 November 2000
1.0 Features
• CMX868 Product Evaluation
• Fully Isolated 2-Wire Line Interface
• Modem Calling/Answering Demonstrations
• ‘AT’ Command Compatible Firmware
• Opto Isolated Ring Detect Circuitry and
OptoMOS Hook Relay
• Single Power Supply Operation with On-
Board Regulator
Advance Information
• PC Controlled via Terminal Emulator
• DIP or SOIC Product Evaluation
• User’s Prototyping Area
• On-Board PIC Programming
• Socketed Space for Optional Telco-
Specific Components
• Socketed Components and Links for
Circuit Adjustment
1.1 Brief Description
The EV8680 Evaluation Kit comprises a single board containing a CMX868 V.22 bis Modem IC, line interface
components and a PIC µC with serial communications port for interfacing to a PC. AT Commands are used to
control the evaluation board via standard terminal emulators.
The board is powered from a single 8 - 14V dc power supply; an on-board regulator and two discrete
components set VDD to provide 2.7 Volt or 5.0 Volt operation. LEDs indicate carrier detect and hook relay
status. The CMX868 may be driven from an external clock, or from the on-board crystal oscillator.
Removal of jumpers allows the user to measure device current and also to disconnect the ‘C-BUS’ control
lines from the on-board µC to allow control from an external system. 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.
The CMX868 and µC are fitted in DIL sockets for easy replacement. Where components are telco-specific
(line impedance, line protection, etc.) space is provided for the user to add appropriate components.
© 2000 Consumer Microcircuits Limited