CMX865AD4-TR1K

Overview

The CMX865AD4-TR1K is a telecom signalling device integrating a DTMF codec and FSK modem, manufactured by CML Micro. It supports V.23 (75/1200 bps), Bell 202 (150/1200 bps), V.21/Bell 103 (300 bps) modulation standards. The unit operates on a single 3.0V to 3.6V supply with a typical operating current of 4 mA. It features an integrated line driver, hybrid, and receiver circuit requiring only passive external components for 2 or 4-wire interfaces. The component is housed in a 16-pin SOIC package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated multi-standard FSK modem supporting V.23, Bell 202, V.21, and Bell 103 protocols
• High-quality DTMF decoder with low voice falsing immunity and standard encoder
• Flexible transmit and receive paths allowing programmable tone generation and detection
• C-BUS serial interface for host microcontroller control and data transfer

Applications

• Wireless Local Loop systems
• Short Message Service (SMS) telephones
• Security systems
• Remote utility meter reading
• Industrial control systems

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and tape-and-reel configuration. Confirm RoHS compliance status and lead times directly with authorized distributors prior to order placement. Ensure the selected variant matches the required pinout and thermal specifications for the target application design.

Selection Notes

Select this component when a combined DTMF and FSK modem solution is required for low-power telecom applications. Verify that the system voltage falls within the 3.0V to 3.6V operating range. Ensure the host microcontroller supports the C-BUS serial interface protocol for proper register configuration and data handling.

Part Context

This part belongs to the CMX865A series of telecom signalling devices. The 'D4' suffix indicates the 16-pin SOIC package variant, while '-TR1K' specifies the tape and reel packaging format containing 1000 units per reel. This distinguishes it from tube-packaged versions like the CMX865AD4.

Replacement Considerations

The CMX865AE4 serves as a functional equivalent utilizing a 16-TSSOP package instead of SOIC. Both variants share identical electrical characteristics and pinouts, facilitating direct board layout adjustments if package footprint changes are permissible.