MC74HC4046AFG

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC74HC4046AFG is a high-performance silicon-gate CMOS phase-locked loop (PLL) manufactured by onsemi. It integrates three phase comparators, a voltage-controlled oscillator (VCO), and a unity gain operational amplifier (DEMOUT). The device operates within a supply voltage range of 3.0 V to 6.0 V and supports an operating temperature range from -55°C to +125°C. It features low quiescent current consumption and high noise immunity. The component is housed in a 16-pin SOEIAJ package with the 'F' suffix indicating this specific form factor.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates three distinct phase comparators: XOR-based PC1, edge-sensing PC2 with tri-state output, and RS flip-flop based PC3.
• Includes a linear VCO with frequency determined by external R1, R2, and C1 components, plus a buffered DEMOUT for loop filter access.
• Provides an Inhibit input (Pin 5) to disable the VCO and op-amps for minimized standby power consumption.
• Compatible with standard CMOS outputs and LSTTL loads when pull-up resistors are used.

Clock Generators, PLLs, Frequency Synthesizers Applications

• FM and FSK modulation and demodulation circuits
• Frequency synthesis and multiplication systems
• Tone decoding and data synchronization conditioning
• Voltage-to-frequency conversion and motor speed control

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix 'FG' corresponds to the Pb-Free SOEIAJ-16 package variant listed in the official onsemi ordering information. Confirm that the 'G' suffix denotes lead-free compliance as per the manufacturer's soldering and mounting techniques reference manual. Ensure availability matches the specified shipping quantity of 50 units per rail for this specific package type.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select Phase Comparator 1 for applications requiring 90-degree phase shift at center frequency with 50% duty cycle inputs. Choose Phase Comparator 2 for zero phase shift requirements independent of duty cycle, noting its susceptibility to noise. Use Phase Comparator 3 for positive edge-triggered detection where duty cycle is immaterial. Ensure external R1/R2/C1 values maintain linearity and stay within the 3.0 kΩ to 300 kΩ resistor ranges.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MC74HC4046A series functions similarly to the legacy MC14046 metal gate CMOS device but utilizes high-speed silicon-gate technology. The 'MC74HC4046AFG' designation specifically identifies the onsemi-manufactured version in the SOEIAJ-16 package with Pb-Free construction. This part belongs to the broader 74HC4046 family produced by multiple vendors including NXP and Texas Instruments.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers include MC74HC4046AFEL (same manufacturer, tape and reel packaging) and MC74HC4046ADG (SOIC-16 package). Cross-vendor equivalents such as CD74HC4046APWR (Texas Instruments) or 74HC4046AD (Nexperia) share functional similarities but require verification of pinout compatibility and electrical parameter limits against the original design specifications.