CD4046 Micro-power Phase-locked Loop – Datasheet

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CD4046 belongs to the CD4000 IC series. The CD4046 micropower phase-locked loop (PLL) consists of low power, linear, voltage-controlled oscillator (VCO), a source follower, a Zener diode, and two-phase comparators. The two-phase comparators have a common signal input and a common comparator input. The signal input can be directly coupled for a large voltage signal, or capacitively coupled to the self-biasing amplifier at the signal input for a small voltage signal. The IC offers a wide variety of features such as high noise immunity and low-frequency drift with a stabilized linear output.

What is a Phase Locked Loop (PLL)?

A phase locked loop is an electronic configuration that consists of a phase detector, voltage controlled oscillator and a loop filter as well as a reference signal source. Within the phase locked loop, the incoming reference hits the phase detector along with a signal from the PLL voltage controlled oscillator. A signal proportional to the phase difference between the two is generated and this is passed through a loop filter to remove unwanted signals. The resulting error signal is applied to the input of the VCO with the effect that the phase between the reference and the VCO signals is reduced. Eventually, a point is reached where a steadily fixed phase difference exists. At this point, the phase lock loop is said to be in the lock and the frequency of the reference and VCO are exactly the same.

CD4046 Key Features

  • Wide supply voltage range: 3.0V to 18V
  • Low dynamic power consumption: 70 µW (typ.) at fo = 10 kHz, VDD = 5V
  • VCO frequency: 1.3 MHz (typ.) at VDD = 10V
  • Low frequency drift: 0.06%/°C at VDD = 10V with temperature
  • High VCO linearity: 1% (typ.)

CD4046 Pinout

Pin NoPin NameDescription
1Phase PulsePhase pulse applied to the IC
2Phase- Comp I Outoutput of Phase Comparator I
3Comparator INInput at the Comparator
4VCO OUTOutput Signal at VCO
5INHIBITelectronically turn on or off the output voltage
6C1ACapacitor 1 connected to VCO
7C1BCapacitor 2 connected to VCO
8VSSsource supply
9VCO INInput Signal at VCO
10D- OUTExtracting the original signal
11R1Resistor 1 connected between VCO and Supply Voltage
12R2Resistor 2 connected between VCO and Supply Voltage
13Phase- Comp II OUTGenerated oscillated output at Phase II Comparator
14Signal INInput Signal applied to the Phase Comparator I
15ZenerZener diode for voltage regulation
16VDDDrain supply

Application

  • FM demodulator and modulator
  • Frequency synthesis and multiplication
  • Frequency discrimination
  • Data synchronization and conditioning
  • Voltage-to-frequency conversion
  • Tone decoding
  • FSK modulation
  • Motor speed control

CD4046 Datasheet

You can download the datasheet for CD4046 Micropower Phase-locked Loop IC from the link given below:

See Also: CD40193 8-bit Up/Down Binary Counter – Datasheet | CD4502 Strobed Hex Inverter/Buffer – Datasheet | CD4067 16-channel Analog Multiplexer/Demultiplexer Datasheet