TECHNICAL DATA
IN74HC4046A
Phase-Locked Loop
High-Performance Silicon-Gate CMOS
The device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL outputs.
The IN74HC4046A phase-locked loop contains three phase
comparators, a voltage-controlled oscillator (VCO) and unity gain op-amp
DEMOUT. The comparators have two common signal inputs, COMPIN, and
SIGIN. Input SIGIN and COMPIN can be used directly coupled to large
voltage signals, or indirectly coupled (with a series capacitor to small
voltage signals). The self-bias circuit adjusts small voltage signals in the
linear region of the amplifier. Phase comparator 1 (an exclusive OR gate)
provides a digital error signal PC1OUT and maintains 90 degrees phase
shift at the center frequency between SIGIN and COMPIN signals (both at
50% duty cycle). Phase comparator 2 (with leading-edge sensing logic)
provides digital error signals PC2OUT and PCPOUT and maintains a 0
degree phase shift between SIGIN and COMPIN signals (duty cycle is
immaterial). The linear VCO produces an output signal VCOOUT whose
frequency is determined by the voltage of input VCOIN signal and the
capacitor and resistors connected to pins C1A, C1B, R1 and R2. The unity
ORDERING INFORMATION
IN74HC4046AN Plastic
IN74HC4046AD SOIC
TA = -55° to 125° C for all packages
gain op-amp output DEMOUT with an external resistor is used where the VCOIN signal is needed but no loading can be
tolerated. The inhibit input, when high, disables the VCO and all on-amps to minimize standby power consumption.
Applications include FM and FSK modulation and demodulation, frequency synthesis and multiplication, frequency
discrimination, tone decoding, data synchronization and conditioning, voltage-to-frequency conversion and motor speed
control.
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Low Power Consumption Characteristic of CMOS Device
Operating Speeds Similary to LS/ALSTTL
PIN ASSIGNMENT
Wide Operating Voltage Range: 3.0 to 6.0 V
Low Input Current: 1.0 µA Maximum (except SIGIN and COMPIN)
Low Quiescent Current: 80 µA Maximum (VCO disabled)
High Noise Immunity Characteristic of CMOS Devices
Diode Protection on all Inputs
Pin No.
Symbol
PCPOUT
PC1OUT
COMPIN
VCOOUT
INH
Name and Function
Phase Comparator Pulse Output
Phase Comparator 1 Output
Comparator Input
1
2
3
4
VCO Output
Inhibit Input
5
6
C1A
C1B
Capacitor C1 Connection A
Capacitor C1 Connection B
Ground (0 V) VSS
7
8
GND
9
VCOIN
DEMOUT
R1
VCO Input
10
11
12
13
14
15
16
Demodulator Output
Resistor R1 Connection
Resistor R2 Connection
Phase Comparator 2 Output
Signal Input
R2
PC2OUT
SIGIN
PC3OUT
VCC
Phase Comparator 3 Output
Positive Supply Voltage
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
