CD74HC4046APW

Overview

The CD74HC4046APW 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 (PC1, PC2, and PC3). Designed for surface-mount applications, it is housed in a 16-pin TSSOP package. The component functions reliably across an extended temperature range from -55°C to +125°C, ensuring stability in demanding environments.

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) with excellent linearity achieved through operational amplifier techniques.
• Includes three selectable phase comparators (PC1, PC2, PC3) to support various loop filter configurations.
• 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
• Motor speed control systems
• FM demodulation and audio processing

Procurement Notes

Verify the specific suffix 'PW' confirms the TSSOP-16 surface-mount package variant when sourcing. Confirm RoHS compliance status via the manufacturer's official documentation prior to integration. Ensure the selected distributor provides traceable data sheets matching the exact part number to avoid confusion with PDIP or SOIC variants.

Selection Notes

Select this component for designs requiring a single-chip PLL solution with multiple phase comparator options. The HC series compatibility allows for direct pin-for-pin replacement of older CD4046B devices in existing layouts. Consider the 38 MHz maximum frequency limit against system requirements. Verify power supply constraints fit within the 2 V to 6 V operating window.

Part Context

This device belongs to the CD74HC4046A family of high-speed silicon-gate CMOS logic components. It maintains pin compatibility with the legacy CD4046B series while offering improved switching speeds. The product falls under the Wireless & RF Integrated Circuits subcategory, specifically classified as a Phase Locked Loop (PLL) IC.

Replacement Considerations

CD74HC4046APWR: Same functional specifications but packaged in a tape-and-reel format instead of cut tape or tube.

FAQ

What types of phase comparators are included in the CD74HC4046APW?

The device integrates three different phase comparators: PC1 (exclusive OR gate), PC2 (edge-triggered JK flip-flop), and PC3 (digital mixer).

How does the input circuit handle small voltage signals?

It utilizes a self-biasing input circuit designed to keep small voltage signals within the linear region of the input amplifier, allowing for direct coupling or indirect coupling via a series capacitor.