LM567CMX

Telecom Overview

The LM567CMX is a tone decoder integrated circuit manufactured by Texas Instruments, belonging to the LM567 family. It functions as a general-purpose phase-locked loop (PLL) tone decoder designed for telecommunications and signal processing applications. The device operates within a supply voltage range of 4.75V to 9V and draws a typical supply current of 12mA. It supports a maximum operating frequency of 500kHz and dissipates up to 1.1W of power. The component is housed in an 8-SOIC surface-mount package with a width of 3.90mm. It is rated for operation between 0°C and 70°C and complies with RoHS3 standards.

Telecom Feature Summary

• Integrates a complete phase-locked loop tone decoder circuit capable of detecting specific input frequencies.
• Features a logic output that switches state when the input signal amplitude exceeds 25mV within the set bandwidth.
• Allows independent setting of center frequency, bandwidth, and output delay through external passive components.

Telecom Applications

• Power line carrier communication systems
• Sub-audio decoding for two-way radios
• Remote control encoding and decoding circuits

Telecom Procurement Notes

Verify the exact ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade. Confirm that the 'MX' designation corresponds to the tape-and-reel format required for automated assembly processes. Cross-reference the datasheet revision date to ensure compatibility with current design specifications and regulatory compliance requirements.

Telecom Selection Notes

Select this component when a single-channel PLL tone decoder is required for frequencies up to 500kHz. Ensure the application environment stays within the 0°C to 70°C operating range. Verify that the available supply voltage falls between 4.75V and 9V. Consider the 8-SOIC package dimensions for PCB layout constraints compared to through-hole alternatives like the LM567CN.

Telecom Part Context

This part is a surface-mount variant of the LM567 series, which serves as a foundational tone decoder in Texas Instruments' portfolio. It shares core functionality with other LM567 variants but differs in packaging and handling characteristics. The LM567 family is widely recognized for its use in analog signal processing tasks requiring frequency discrimination and demodulation capabilities.

Telecom Replacement Considerations

The LM567CN/NOPB is a parameter-equivalent through-hole alternative from Texas Instruments. Designers must account for the difference in mounting style and pin configuration when substituting surface-mount parts with dual in-line packages.