CMX869BD2

Overview

The CMX869BD2 is a low-power V.32 bis automode modem IC manufactured by CML Microcircuits, designed for EPOS terminals and telephone telemetry systems. It supports ITU V.32 bis automode operation with automatic fallback from 14400 bps to 4800 bps, alongside manual modes for V.22 bis, V.22, V.21, Bell 103, V.23, and Bell 202 protocols. The device integrates a high-performance DTMF codec, ring detector, and relay driver. Operating on a single 3.3V supply, it functions within a temperature range of -40°C to +85°C and is housed in a 24-pin SOIC package.

Feature Summary

• Integrates multi-standard QAM and FSK modulation/demodulation capabilities for comprehensive telecommunication protocol support.
• Includes a high-quality DTMF decoder with strong immunity to falsing and a standard encoder for tone generation.
• Features an embedded USART supporting asynchronous, synchronous, and HDLC data formats with V.14 compatibility.
• Provides integrated line interface circuits including hybrid and gain control, requiring only passive external components.

Applications

• EPOS (Electronic Point of Sale) terminals
• Telephone-based information and telemetry systems
• Remote utility meter reading devices
• Security systems

Procurement Notes

Verify the specific suffix 'D2' confirms the 24-pin SOIC package variant when sourcing. Confirm that the 3.3V supply requirement aligns with the target system design. Ensure the operating temperature range meets environmental specifications. Cross-reference the datasheet version to confirm pinout consistency for the SOIC footprint.

Selection Notes

Select this component for applications requiring a single-chip solution for V.32 bis automode communication. It is suitable where space constraints favor an integrated modem over discrete solutions. Consider the power consumption profile if battery operation is critical. Verify host microcontroller compatibility with the C-BUS serial interface for control and data transfer.

Part Context

The CMX869BD2 belongs to the CMX869B family of low-power modems from CML Microcircuits. This series is engineered for robust performance in voice-grade telephone lines. The 'D2' designation specifically identifies the surface-mount SOIC package option within the broader CMX869B product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer resources for potential obsolescence management or alternative package variants such as the TSSOP version.