CMX979Q4

Overview

The CMX979Q4 is a dual PLL and VCO RF building block designed for CATV and ISM applications. It operates within a frequency range of 500 MHz to 1 GHz and requires an operating supply voltage between 2.7 V and 3.6 V. The device supports both fractional and integer-N synthesis modes, providing flexible local oscillator generation for up/down conversion systems.

Feature Summary

• Integrates dual phase-locked loops with a voltage-controlled oscillator
• Supports fractional and integer-N frequency synthesis architectures
• Optimized for CATV and ISM band signal processing

Applications

• CATV receiver front ends
• ISM band communication modules
• Up/down converter local oscillators

Procurement Notes

Verify the specific suffix (e.g., Q4 vs TR1K) against official CML Micro documentation to confirm packaging type and reel specifications. Ensure the design-in process accounts for moisture sensitivity classification and recommended soldering profiles. Cross-reference the exact part number with current distributor availability lists to avoid ordering discrepancies due to obsolete or alternate packaging variants.

Selection Notes

Select this component when a compact solution for dual-loop synthesis is required in the 500 MHz to 1 GHz range. It is suitable for designs needing integrated VCO functionality without external resonators. Consider the 40-VQFN package constraints for thermal management and PCB layout requirements compared to discrete PLL/VCO combinations.

Part Context

This component belongs to the CML Micro RF Building Block series, which focuses on integrated solutions for wireless infrastructure. It complements other mixers and receivers by providing stable local oscillator signals. The dual PLL architecture allows for independent frequency control paths, enhancing system flexibility in complex transceiver designs.

Replacement Considerations

Check for direct pin-compatible substitutes within the same family. Verify if alternative synthesizers meet the 500 MHz to 1 GHz coverage and supply voltage requirements. Confirm that any replacement supports the necessary fractional/integer-N modes for your specific application.