MC74HC4046ADTR2G

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC74HC4046ADTR2G 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, with non-VCO operation supported down to 2.0 V. It features an operating temperature range from -55°C to +125°C and is housed in a TSSOP-16 package. The component provides drive capability for 10 LSTTL loads and includes diode protection on all inputs.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates Phase Comparator 1 (XOR), Phase Comparator 2 (edge-sensitive), and Phase Comparator 3 (RS flip-flop based).
• Includes a linear Voltage-Controlled Oscillator (VCO) with frequency determined by external R1, R2, and C1 components.
• Features a unity gain op-amp output (DEMOUT) for buffered access to the VCO input voltage without loading the loop filter.
• Provides an Inhibit input (INH) to disable the VCO and op-amps for minimized standby power consumption.

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 applications.
• Motor speed control loops.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix 'R2' corresponds to the TSSOP-16 tape and reel packaging configuration as defined in the manufacturer's ordering information. Confirm that the component meets Pb-Free requirements if applicable to the assembly process. Check current availability status through authorized distributors, as production lifecycles may affect stock levels.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a single-chip PLL solution with multiple comparator options is required for CMOS logic compatibility. Ensure the design accommodates the 3.0 V to 6.0 V supply voltage range and the -55°C to +125°C industrial temperature grade. Verify that the TSSOP-16 package dimensions fit the PCB layout constraints and that thermal dissipation limits are respected under maximum load conditions.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the 74HC4046A family of phase-locked loops. It is functionally similar to the older MC14046 metal gate CMOS device but utilizes high-speed silicon-gate technology. The HC series offers operating speeds comparable to LSTTL while maintaining low power consumption characteristics typical of CMOS devices. It serves as a direct replacement for legacy designs requiring robust frequency synthesis capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct substitutes include other manufacturers' 74HC4046 variants such as those from NXP or Nexperia, provided they match the TSSOP-16 package and electrical specifications. Verify pinout compatibility and ensure that any alternative component supports the same voltage ranges and temperature specifications.