CMX7143Q3

Overview

The CMX7143Q3 is a multi-mode wireless data modem manufactured by CML Microcircuits, designed for half-duplex applications. It operates on a single 3.3V supply and utilizes Function Image technology to support 4FSK modulation via the 7143FI-2.x firmware. The device features automatic frame sync detection, preamble insertion, and carrier sense capabilities. It includes two auxiliary ADCs, four auxiliary DACs (one with RAMDAC), and three analog inputs. Communication with the host microcontroller is handled through a C-BUS serial interface. The component is housed in a 48-pin VQFN package.

Feature Summary

• Supports 4FSK modulation with over-air compatibility for RD-LAP Tx/Rx
• Features automatic frame sync detection and preamble insertion
• Includes integrated RAMDAC for transmitter power amplifier ramping control
• Provides flexible powersaving modes and configurable GPIO pins

Applications

• Wireless data modems requiring half-duplex operation
• Systems utilizing RD-LAP channel coding block types
• Applications needing listen-before-talk carrier sense functionality

Procurement Notes

Verify the specific Function Image version required for your application, as the Q3 suffix denotes the VQFN package but does not alter the modem's functional logic. Confirm that the host system supports the C-BUS serial interface protocol. Ensure proper decoupling of AVDD and DVDD rails according to the datasheet guidelines to maintain signal integrity. Check for updated Function Image releases from CML Microcircuits to access potential feature enhancements or bug fixes.

Selection Notes

Select this model when 4FSK modulation is specifically required, distinguishing it from GMSK/GFSK or FFSK/MSK variants within the same family. The VQFN package is suitable for space-constrained surface-mount designs. Consider the availability of the 7143FI-2.x Function Image if RD-LAP compatibility is necessary. Evaluate the need for auxiliary ADC/DAC channels for external sensor monitoring or PA control before finalizing the part choice.

Part Context

The CMX7143Q3 belongs to the CMX7143 series of multi-mode wireless data modems. The 'Q3' suffix identifies the 48-pin VQFN package variant, while the 'L4' suffix corresponds to the LQFP package. The device relies on uploaded Function Images to define its operational mode, with the 7143FI-2.x image providing 4FSK capabilities. This distinguishes it from other versions like the CMX7143Q3 which may utilize different Function Images for alternative modulation schemes.

Replacement Considerations

The CMX7143L4 serves as the pin-compatible replacement offering identical functionality in an LQFP package. Other models such as the CMX7143Q3 using different Function Images (e.g., FI-1.0 for GMSK) are functionally distinct and require firmware changes. No direct cross-model substitutes exist without altering the modulation type or package style.