CD4047BF3A datasheet by Texas Instruments

CD4047BF3A Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the CD4047BF3A?
  The recommended operating voltage range for the CD4047BF3A is 3V to 15V.
• How do I ensure the CD4047BF3A oscillator starts reliably?
  To ensure the oscillator starts reliably, a capacitor (typically 10nF to 100nF) should be connected between the timing capacitor pin (pin 2) and ground. This helps to discharge the capacitor and ensure a reliable start-up.
• What is the purpose of the internal diode (D1) in the CD4047BF3A?
  The internal diode (D1) in the CD4047BF3A is used to protect the device from backpowering, which can occur when the output is connected to a voltage source that is higher than the supply voltage.
• How do I choose the correct timing components (R and C) for the CD4047BF3A?
  The timing components (R and C) should be chosen based on the desired frequency of operation. A higher value of R and a lower value of C will result in a lower frequency, while a lower value of R and a higher value of C will result in a higher frequency. The datasheet provides a formula to calculate the frequency based on the values of R and C.
• Can the CD4047BF3A be used as a voltage-controlled oscillator (VCO)?
  Yes, the CD4047BF3A can be used as a voltage-controlled oscillator (VCO) by applying a control voltage to the threshold pin (pin 5). The frequency of oscillation will vary in response to changes in the control voltage.