MC74HC4046ADTG

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC74HC4046ADTG is a high-performance silicon-gate CMOS phase-locked loop (PLL) integrated circuit manufactured by onsemi. It integrates three distinct 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 functionality supported down to 2.0 V. It features an operating temperature range from -55°C to +125°C. Key electrical parameters include a maximum quiescent current of 80 µA when the VCO is disabled and output drive capability equivalent to 10 LSTTL loads. The component is housed in a TSSOP-16 package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates Phase Comparator 1 (XOR gate), Phase Comparator 2 (digital memory network with tri-state output), and Phase Comparator 3 (edge-triggered sequential detector).
• Includes a linear Voltage-Controlled Oscillator (VCO) with frequency determined by external R1, R2, and C1 components.
• Features a unity gain op-amp buffer (DEMOUT) for accessing 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 and motor speed control.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix 'DTG' against the manufacturer's official documentation to confirm the TSSOP-16 packaging and Pb-Free status. Cross-reference the part number with the latest datasheet revision history to ensure compliance with current environmental standards and pinout configurations before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a single-chip PLL solution with multiple comparator options is required. Phase Comparator 2 is suitable for applications requiring zero steady-state phase error and lock detection via the PCP output. Ensure external timing components (R1, R2, C1) are selected within the specified ranges to maintain VCO linearity and frequency stability across the operating temperature range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The MC74HC4046A belongs to the 74HC logic family, offering speeds similar to LSTTL with low power consumption characteristic of CMOS devices. The 'ADTG' designation indicates the SOIC/TSSOP variant with specific packaging and lead-free attributes. This device is functionally similar to the older MC14046 metal-gate CMOS device but utilizes high-speed silicon-gate technology.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional substitutes include other 74HC4046 variants from different manufacturers such as Nexperia or NXP, provided they match the TSSOP-16 package and electrical specifications. Verify pin compatibility and operating voltage ranges when substituting.