CD74HC4046AM

Overview

The CD74HC4046AM is a high-speed CMOS logic phase-locked loop (PLL) integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports a maximum frequency of 38MHz. The device is housed in a 16-SOIC package with a width of 3.90mm and functions across an extended temperature range from -55°C to 125°C. It contains one PLL circuit with CMOS input and output levels, designed for surface-mount installation.

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) alongside three distinct phase comparators for flexible loop configuration.
• Features a self-biasing input circuit that maintains small voltage signals within the linear region of the input amplifier.
• Supports direct coupling for large voltage signals or indirect capacitive coupling for smaller signals.

Applications

• Frequency synthesis circuits
• Motor speed control systems
• FM demodulation

Procurement Notes

Verify the specific suffix 'AM' corresponds to the 16-SOIC package variant when sourcing. Confirm RoHS3 compliance status as indicated in official documentation. Ensure the operating environment remains within the specified -55°C to 125°C temperature limits for reliable performance.

Selection Notes

Select this component for applications requiring a single PLL with multiple comparator options in a surface-mount format. Compare against the CD74HCT4046AM if TTL-compatible inputs are required instead of standard CMOS levels. Verify pin compatibility with legacy CD4046B designs if migrating existing circuits.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It serves as a functional replacement for the older CD4046B while offering improved switching speeds. The device is widely used in timing and frequency control applications due to its versatile internal architecture.

Replacement Considerations

CD74HCT4046AM offers identical functionality but with HCT logic input thresholds suitable for TTL-driven systems. CD74HC4046AE provides the same electrical characteristics in a through-hole PDIP package for prototyping or board layouts requiring vertical mounting.

FAQ

What types of phase comparators are included?

The CD74HC4046AM integrates three different phase comparators: PC1, PC2, and PC3, allowing for various loop filter configurations.

How does the device handle signal coupling?

It supports both direct coupling for large voltage signals and indirect coupling via series capacitors for small voltage signals, aided by a self-biasing input circuit.