CMX865AE4-TR1K

Overview

The CMX865AE4-TR1K is a telecom signalling device integrating DTMF codec and modem functions. It supports V.23, Bell 202, V.21, and Bell 103 standards at baud rates of 75, 150, and 1200 bps. The component operates on a single 3.0V to 3.6V supply over a temperature range of -40°C to +85°C. It features a high-speed C-BUS serial interface for host control and an embedded USART for asynchronous data transfer. The device is housed in a 16-pin TSSOP package.

Feature Summary

• Integrated flexible line driver, hybrid, and receiver circuits requiring only passive external components for 2 or 4-wire interfaces.
• High-quality DTMF decoder with low voice falsing immunity alongside standard DTMF encoder capabilities.
• Programmable transmit and receive modes supporting multiple FSK standards and user-defined tone generation.

Applications

• Wireless Local Loop systems
• SMS Phones
• Security Systems
• Remote Utility Meter Reading
• Industrial Control Systems

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and reel specifications. Ensure compatibility with the required serial interface protocol before integration. Confirm environmental compliance status such as RoHS requirements for the target application region.

Selection Notes

Select this model when a combined DTMF and FSK modem solution is required within a limited pin count. The integrated line interface reduces external component count compared to discrete solutions. Verify that the host microcontroller supports the C-BUS serial protocol for proper configuration and data handling.

Part Context

This component belongs to the CMX865A series of telecom signalling devices. The E4 suffix denotes the 16-pin TSSOP package variant, distinct from the SOIC package options available in the same family. It serves as a multi-standard modem for telemetry and information systems.

Replacement Considerations

Direct substitutes include other variants within the CMX865A family, such as the CMX865AD4 for SOIC packaging. Cross-referencing pinouts and electrical characteristics is essential when replacing with non-CML Micro components.

FAQ

How does the CMX865AE4 handle power consumption during idle states?

The device includes a powersave mode that disables all internal circuitry except for the C-BUS interface, significantly reducing power consumption when the modem is not actively transmitting or receiving.

What is the function of the TXA and TXAN pins?

TXA and TXAN provide symmetrical differential outputs from the Tx Output Buffer. They are used to drive transformer-based line interfaces, ensuring sufficient voltage swing and reduced harmonic distortion.