CMX869BD2 – CML

The CMX869BD2 is a low-power, single-chip V.32 bis modem IC manufactured by CML Microcircuits. It implements full-duplex data transmission at speeds up to 14.4 kbps, conforming to the ITU-T V.32 bis standard, and is backward compatible with V.22 bis, V.22, V.21, and Bell 212A/103 modulations. The device incorporates a digital signal processor (DSP) core for modulation, demodulation, and equalization functions, minimizing external component requirements. It features programmable transmit and receive levels, automatic adaptive equalization, and comprehensive diagnostic capabilities including loopback testing. The CMX869BD2 operates from a single 3.3V or 5V supply and includes power-down modes to minimize current consumption in low-activity states. It provides a digital interface for connection to a microcontroller or host processor, typically utilizing a UART or SPI interface for control and data transfer.