CMX7158Q3

Audio Special Purpose Overview

The CMX7158Q3 is a low-power, full-duplex frequency inversion voice scrambler IC from CML Micro. It features independent transmit and receive channels with digital gain control and a programmable inversion frequency split point. The device supports C-BUS (SPI compatible) serial control, Voice Activity Detection (VOX), Transmit AGC, and DTMF/Selcall signaling. It operates on a single 3V to 3.6V supply and is available in a 48-VQFN (7x7 mm) package.

Audio Special Purpose Feature Summary

• Full-duplex operation with independent TX and RX channels
• Frequency inversion audio scrambling with programmable split point
• Integrated Voice Activity Detection (VOX) and Transmit AGC
• Supports Selcall and DTMF signaling
• C-BUS (SPI compatible) serial control interface
• Single 3V to 3.6V power supply

Audio Special Purpose Applications

• Mobile radio systems
• Cellular and Bluetooth accessories
• Intercom systems
• Wired telephony

Audio Special Purpose Procurement Notes

Verify the package type matches the 48-VQFN specification. Confirm the operating voltage range aligns with the 3V to 3.6V requirement. Ensure the interface compatibility with the system's C-BUS controller is validated before integration.

Audio Special Purpose Selection Notes

Select this component for applications requiring full-duplex audio encryption. Consider the 2-channel architecture and serial interface requirements. Verify that the 48-VQFN footprint fits the PCB layout constraints and that the thermal dissipation meets the design specifications.

Audio Special Purpose Part Context

This part belongs to the CMX7158 series of audio scramblers manufactured by CML Micro. It is specifically engineered to prevent digital eavesdropping by rendering speech unintelligible to casual listeners while maintaining clear recovered audio quality.