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MC74HC4046ADT
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MC74HC4046ADT

Overview

Category: Integrated Circuit (IC)

Use: Phase-Locked Loop (PLL) with Voltage Controlled Oscillator (VCO)

Characteristics: - High-speed CMOS technology - Low power consumption - Wide operating voltage range - Schmitt trigger inputs for improved noise immunity

Package: SOIC-16

Essence: The MC74HC4046ADT is a phase-locked loop integrated circuit that combines a voltage-controlled oscillator (VCO) and phase comparator in a single package. It is designed to provide accurate frequency synthesis and synchronization in various electronic applications.

Packaging/Quantity: The MC74HC4046ADT is available in a standard SOIC-16 package and is typically sold in reels of 2500 units.

Specifications and Parameters

  • Supply Voltage Range: 2V to 6V
  • Operating Temperature Range: -40°C to +85°C
  • Frequency Range: DC to 10MHz
  • VCO Frequency Control Range: ±10%
  • Phase Comparator Input Voltage Range: 0V to VCC

Pin Configuration

The MC74HC4046ADT features the following pin configuration:

  1. VCO Input
  2. VCO Output
  3. Phase Comparator Input A
  4. Phase Comparator Input B
  5. Phase Comparator Input C
  6. Phase Comparator Output
  7. Charge Pump Output
  8. Ground
  9. Reset
  10. Lock Detect
  11. Filter Resistor
  12. Filter Capacitor
  13. Reference Frequency Input
  14. Reference Frequency Output
  15. Phase Comparator Bias Input
  16. Positive Supply Voltage

Functional Characteristics

The MC74HC4046ADT offers the following functional characteristics:

  • Phase-locked loop operation
  • Frequency synthesis and synchronization
  • Voltage-controlled oscillator (VCO) with wide frequency control range
  • Phase comparator for precise phase detection
  • Charge pump for generating control voltage
  • Lock detect output for indicating PLL lock status
  • Reset input for initialization

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide operating voltage range - Improved noise immunity with Schmitt trigger inputs - Compact and integrated design

Disadvantages: - Limited frequency range (up to 10MHz) - Requires external components for proper operation - Sensitive to supply voltage fluctuations

Applicable Range of Products

The MC74HC4046ADT is widely used in electronic systems that require accurate frequency synthesis, synchronization, and phase-locked loop functionality. It finds applications in areas such as:

  • Communication systems
  • Audio and video equipment
  • Data transmission devices
  • Test and measurement instruments
  • Industrial control systems

Working Principles

The MC74HC4046ADT operates based on the principles of a phase-locked loop (PLL). It compares the phase and frequency of an input reference signal with that of a voltage-controlled oscillator (VCO) output. The phase comparator generates an error signal, which is filtered and fed into the VCO to adjust its frequency. This feedback mechanism ensures that the VCO output remains locked to the reference signal, providing accurate frequency synthesis and synchronization.

Detailed Application Field Plans

The MC74HC4046ADT can be applied in various fields, including:

  1. Communication Systems: Used for carrier recovery, clock generation, and frequency modulation/demodulation.
  2. Audio and Video Equipment: Enables precise frequency generation for audio and video signal processing.
  3. Data Transmission Devices: Provides clock recovery and synchronization in data communication systems.
  4. Test and Measurement Instruments: Utilized for frequency synthesis and phase detection in test equipment.
  5. Industrial Control Systems: Enables precise timing and synchronization in industrial automation applications.

Detailed Alternative Models

Some alternative models to the MC74HC4046ADT include:

  1. CD4046BE
  2. HEF4046BP
  3. 74HCT4046N
  4. CD74HC4046E
  5. SN74HC4046N

These models offer similar functionality and can be used as substitutes depending on specific requirements.

5 Common Technical Questions and Answers

  1. Q: What is the maximum operating frequency of the MC74HC4046ADT? A: The MC74HC4046ADT has a frequency range of DC to 10MHz.

  2. Q: Can the MC74HC4046ADT operate with a supply voltage below 2V? A: No, the MC74HC4046ADT requires a supply voltage range of 2V to 6V for proper operation.

  3. Q: How does the lock detect output work? A: The lock detect output indicates whether the PLL is locked to the