CD74HC4046APWT

Overview

The CD74HC4046APWT is a high-speed CMOS logic phase-locked loop (PLL) integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports a maximum input frequency of 38 MHz. The device integrates a linear voltage-controlled oscillator (VCO) and three distinct phase comparators, enabling flexible loop configurations via passive low-pass filters. Designed for surface-mount applications, it utilizes a TSSOP-16 package. The component functions reliably across an extended temperature range from -55 °C to +125 °C, ensuring stable performance in demanding electronic environments.

Feature Summary

• Integrates a linear voltage-controlled oscillator with high linearity achieved through operational amplifier techniques.
• Includes three selectable phase comparators allowing for diverse loop filter designs and signal coupling methods.
• Features self-biasing input circuits that maintain small voltage signals within the linear region of the input amplifier.

Applications

• Frequency synthesis and clock generation circuits
• Demodulation of FM signals
• Motor speed control systems

Procurement Notes

Verify the specific suffix APWT corresponds to the TSSOP-16 surface-mount package configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets prior to integration. Ensure ordering specifications match the required operating temperature range and voltage parameters defined in the technical data.

Selection Notes

Select this component when a single-channel PLL with multiple phase comparator options is required for high-speed CMOS applications. Consider the TSSOP-16 package constraints for PCB layout. Verify compatibility with the system's supply voltage limits and ensure the external components support the 38 MHz maximum frequency specification.

Part Context

This part belongs to the CD74HC4046A series, which provides pin-compatible alternatives to the legacy CD4046B devices while offering improved switching speeds. The series is designed to meet JEDEC standards for digital logic interfaces. The APWT designation specifically identifies the tape-and-reel packaging format suitable for automated surface-mount assembly processes.

Replacement Considerations

CD74HC4046APWR serves as a reel-based alternative within the same package family. For through-hole requirements, CD74HC4046AE offers a PDIP variant. Cross-reference pinouts and electrical characteristics carefully before substitution.