CMX868AD2

The CML Microcircuits CMX868AD2 is a versatile, low-power modem integrated circuit supporting multiple communication standards including V.22 bis at 2400 bps, V.22 and Bell 212A at 1200 bps, V.23, Bell 202, and V.21 or Bell 103 at 300 bps.

This device features on-chip programmable Tx and Rx USARTs compatible with V.14 for asynchronous and synchronous data transfer. It includes integrated DTMF transmit and receive capabilities, along with flexible line driver and hybrid circuits requiring minimal external passive components for a 2 or 4-wire line interface. The CMX868AD2 also provides a hook switch relay drive output and a Ring Detector circuit that functions even in powersave mode, capable of waking the host microcontroller upon detecting line voltage reversal or ringing.

Operating from a single 2.7V to 5.5V supply, the CMX868AD2 is suitable for applications such as telephone telemetry systems, remote utility meter reading, security systems, industrial control, electronic cash terminals, and set-top boxes. It is available in a 24-pin SOIC package suitable for surface mounting.

The device operates across a temperature range of -40°C to +85°C. Control is managed via a high-speed serial bus, and data is transferred over the same bus. Its powersave standby mode contributes to low power consumption.