HEF4046BT,652 datasheet by NXP Semiconductors

HEF4046BT,652 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the HEF4046BT,652 can handle?
  The maximum clock frequency of the HEF4046BT,652 is 25 MHz, but it can be operated at higher frequencies with reduced voltage supply.
• How do I ensure that the PLL (Phase-Locked Loop) in the HEF4046BT,652 is properly locked?
  To ensure the PLL is properly locked, the VCO (Voltage-Controlled Oscillator) range should be set correctly, and the loop filter components should be chosen according to the datasheet recommendations. Additionally, the PLL lock detector output can be used to monitor the lock status.
• What is the purpose of the VCO input voltage range in the HEF4046BT,652?
  The VCO input voltage range (typically 0.5V to 2.5V) controls the frequency of the VCO output. The VCO input voltage range should be set according to the desired output frequency and the specific application requirements.
• How do I choose the correct values for the loop filter components in the HEF4046BT,652?
  The loop filter component values (R1, R2, C1, and C2) should be chosen based on the desired PLL bandwidth, phase margin, and loop gain. The datasheet provides guidelines and equations to help with the component selection.
• What is the recommended power-on reset circuit for the HEF4046BT,652?
  A simple power-on reset circuit can be implemented using a resistor, capacitor, and diode. The datasheet provides a recommended circuit diagram and component values for a reliable power-on reset.