4046 IC Phase-locked loop

CD4046
is a Micropower Phase-Locked Loop (PLL) that comes with a phase detector for comparing the phase of the output signal with the input signal and adjusting them in order to make the matching signals from both ends.

It comes with a common comparator input and a common signal input amplifierbetween a low-powerlinear voltage-controlled oscillator (VCO) and two different phase comparators.

The input signal can be operated in two ways: capacitively layered with a self-biasing amplifier for creating a small voltage signal or directly coupled for a large voltage signal.

The VCO (Voltage Controlled Oscillator) is an integral part of the IC that mainly generates oscillatedfrequency based on the applied input. The generated frequency is then used for phase modulation.

The chip features two phasecomparatorsi.e. Phase Comparator I and Phase Comparator II. They are also known as Phase Detectors.

Phase comparator I is nothing but an exclusive OR gate that produces a digital, maintaining 90 phase shifts at the VCO.

It is important to note that both signal input and comparator input are set at 50% duty cycle where Phase Comparator I can lock the input frequencies that match with the magnitude of the VCO center frequency.

Similarly, Phase comparator II is known as an edge-controlled digital memory network and maintains a0 phase shift between signalinput and comparator input, providing a lock-in and digital error signal.

Pin No

Pin Name

Description

1

Phase Pulse

Phase pulse applied to the IC

2

Phase- Comp I Out

the output of Phase Comparator I

3

Comparator IN

Inputat the Comparator

4

VCO OUT

Output Signal at VCO

5

INHIBIT

electronically turn on or off the output voltage

6

C1A

Capacitor 1 connected to VCO

7

C1B

Capacitor 2 connected to VCO

8

VSS

source supply

9

VCO IN

Input Signal at VCO

10

D- OUT

Extracting the original signal

11

R1

Resistor 1 connected between VCO and Supply Voltage

12

R2

Resistor 2 connected between VCO and Supply Voltage

13

Phase- Comp II OUT

Generated oscillated output at Phase II Comparator

14

Signal IN

Input Signal applied to the Phase Comparator I

15

Zener

Zenerdiodefor voltage regulation

16

VDD

Drain supply

Technical Specifications

Physical

Case/Package

PDIP

Contact Plating

Gold

Mount

Through Hole

Number of Pins

16

Technical

Frequency

2.4 MHz

Input

CMOS

Max Frequency

2.4 MHz

Max Operating Temperature

125 C

Max Supply Voltage

18 V

Min Operating Temperature

-55 C

Min Supply Voltage

3 V

Nominal Supply Current

10 mA

Number of Bits

1

Number of Circuits

1

Number of Elements

1

Number of Gates

1

PLL

Yes

Voltage

20 V

Applications

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

Datasheet