CD74HCT4046AM datasheet by Texas Instruments

CD74HCT4046AM Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the CD74HCT4046AM?
  The recommended operating voltage range for the CD74HCT4046AM is 4.5V to 5.5V, with a typical voltage of 5V.
• How do I ensure the PLL (Phase-Locked Loop) is properly locked in the CD74HCT4046AM?
  To ensure the PLL is properly locked, the VCO (Voltage-Controlled Oscillator) input voltage should be within the recommended range, and the loop filter components should be selected according to the datasheet guidelines. Additionally, the input clock signal should be stable and within the specified frequency range.
• What is the maximum clock frequency that the CD74HCT4046AM can handle?
  The maximum clock frequency that the CD74HCT4046AM can handle is 20 MHz, but this may vary depending on the specific application and operating conditions.
• How do I choose the correct values for the loop filter components (R1, R2, C1, and C2) in the CD74HCT4046AM?
  The loop filter component values can be calculated using the equations provided in the datasheet, or by using online calculators and simulation tools. The values should be selected based on the desired PLL bandwidth, phase margin, and stability requirements.
• What is the purpose of the VCO input voltage (VIN) in the CD74HCT4046AM?
  The VCO input voltage (VIN) is used to control the frequency of the VCO, which in turn controls the output frequency of the PLL. The VIN voltage should be within the recommended range to ensure proper PLL operation.