CMX589AD5

Overview

The CMX589AD5 is a single-chip GMSK modem manufactured by CML Microcircuits, designed for wireless data applications. It supports data rates from 4kbps to 200kbps with selectable BT values of 0.3 or 0.5. The device operates on a 3.0V to 5.5V supply and features low power consumption, drawing typically 1.5mA at 3.0V/20kbps and 4.0mA at 5.0V/64kbps. It utilizes a non-DSP architecture and is housed in a 24-pin SSOP package.

Feature Summary

• Supports full or half-duplex Gaussian Minimum Shift Keying (GMSK) modulation with selectable BT parameters.
• Features pin-programmable data rates ranging from 4kbps to 200kbps via internal clock divider control.
• Includes integrated receive signal quality assessment through an Rx S/N output indicator.
• Provides separate Tx and Rx powersave inputs to manage power consumption during idle periods.

Applications

• Cellular Digital Packet Data (CDPD)
• Mobitex Mobile Data System
• Spread Spectrum Data Links
• GPS/Differential GPS Wireless Links

Procurement Notes

Verify the specific ordering suffix 'D5' corresponds to the 24-pin SSOP package variant when sourcing components. Confirm that the application design accommodates the required external RC networks for transmit filtering and receive gain adjustment as specified in the datasheet. Ensure supply voltage levels align with the operational limits for the selected data rate.

Selection Notes

Select this component for systems requiring a low-power, non-DSP solution for GMSK baseband processing. Consider the 24-pin SSOP package constraints for PCB layout if space is limited. Evaluate the need for external crystal or clock sources based on the desired data rate and available system frequencies. Verify compatibility with the host microcontroller's serial interface requirements.

Part Context

The CMX589A series includes variants such as CMX589AE2 (TSSOP), CMX589AD2 (SOIC), and CMX589AP4 (PDIP). The CMX589AD5 specifically denotes the SSOP package option within this family. All variants share identical electrical characteristics and functionality, differing only in physical packaging dimensions.

Replacement Considerations

Direct substitutes are not explicitly listed in public documentation. Alternative solutions may require redesigning the RF front-end and baseband logic due to the specific GMSK implementation and pinout configuration of the CMX589A family.