CMX865AE4

Overview

The CMX865AE4 is a telecom signalling device integrating a DTMF codec and multi-standard modem. It supports V.23 (1200/75, 1200/1200, 75, 1200 bps), Bell 202 (1200/150, 1200/1200, 150, 1200 bps), and V.21/Bell 103 (300/300 bps) FSK modulation. 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 or synchronous data transfer. The device is housed in a 16-pin TSSOP package.

Feature Summary

• Integrates flexible line driver, hybrid, and receiver circuits requiring only passive external components for 2-wire or 4-wire interfaces.
• Includes a low voice falsing DTMF decoder and standard DTMF encoder capable of transmitting and receiving user-specific programmed tones.
• Features an embedded USART allowing multi-format asynchronous data and unformatted synchronous data reception or transmission as 8-bit bytes.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'E4' corresponds to the 16-TSSOP package variant when sourcing. Confirm that the required RoHS3 compliance status aligns with project environmental regulations. Ensure the host microcontroller supports the C-BUS serial protocol timing requirements specified in the datasheet for reliable communication.

Selection Notes

Select this component for designs requiring integrated DTMF and FSK modem capabilities within a compact footprint. The 16-TSSOP package is suitable for surface mount applications where space is constrained. Consider the 3.0V to 3.6V operating voltage range to ensure compatibility with the system power supply architecture.

Part Context

The CMX865AE4 belongs to the CMX865A family of telecom signalling devices manufactured by CML Micro. It serves as a combo unit combining modem and DTMF functions. Other variants in the series include the CMX865AD4, which utilizes a 16-SOIC package instead of the TSSOP form factor found in the AE4 version.

Replacement Considerations

CMX865AD4