CMX867AD2

Overview

The CMX867AD2 is a low-power V.22 modem integrated circuit manufactured by CML Microcircuits, designed for telephone-based information and telemetry systems. It supports multiple standards including V.22, Bell 212A (1200/1200 or 600/600 bps DPSK), V.23 (1200/75, 1200/1200, 75, 1200 bps FSK), Bell 202 (1200/150, 1200/1200, 150, 1200 bps FSK), and V.21/Bell 103 (300/300 bps FSK). The device operates on a single 2.7V to 5.5V supply with a typical operating current of 5.5 mA and features a 'Powersave' standby mode. It integrates programmable Tx/Rx USARTs, DTMF encoder/decoder, flexible line drivers, ring detector, and hook switch relay drive within a 24-pin SOIC package.

Feature Summary

• Multi-standard modulation support for V.22, Bell 212A, V.23, Bell 202, and V.21/Bell 103 protocols
• Integrated high-quality DTMF decoder with voice immunity and standard DTMF encoder
• Flexible line driver and receive hybrid circuits requiring only passive external components
• On-chip programmable Tx and Rx USARTs meeting V.14 requirements for asynchronous data

Applications

• Telephone Telemetry Systems
• Remote Utility Meter Reading
• Security Systems
• Electronic Cash Terminals
• Pay-Phones

Procurement Notes

Verify the specific suffix 'D2' against the manufacturer's latest datasheet to confirm pinout compatibility and package dimensions. Ensure the host microcontroller serial interface aligns with the C-BUS protocol specifications. Confirm that the selected component meets the required environmental temperature range and voltage supply constraints for the target application design.

Selection Notes

Select this component when designing systems requiring multi-standard modem capabilities in a compact form factor. Consider the integrated DTMF functions if tone signaling is necessary. Evaluate the power consumption characteristics against battery-operated requirements, noting the availability of a powersave mode. Ensure the system architecture can accommodate the serial bus control interface for configuration and data transfer.

Part Context

The CMX867AD2 belongs to the CMX86X series of communication semiconductors from CML Microcircuits. This family focuses on wireline signaling and data interface solutions for telecommunications applications. The device shares software and hardware compatibility with the CMX868A, facilitating potential migration paths between different modem standard requirements within the same product ecosystem.

Replacement Considerations

The CMX867A is noted as being software and hardware compatible with the CMX868A. Designers should verify if the CMX868AD2 serves as a direct functional substitute, ensuring all peripheral connections and register configurations remain valid for the intended application.