TECHNICAL DATA
Phase-Locked Loop
High-Performance Silicon-Gate CMOS
IN74HC4046A
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
DEM
OUT
. The comparators have two common signal inputs, COMP
IN
, and
SIG
IN
. Input SIG
IN
and COMP
IN
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 PC1
OUT
and maintains 90 degrees phase
shift at the center frequency between SIG
IN
and COMP
IN
signals (both at
ORDERING INFORMATION
50% duty cycle). Phase comparator 2 (with leading-edge sensing logic)
IN74HC4046AN Plastic
provides digital error signals PC2
OUT
and PCP
OUT
and maintains a 0
IN74HC4046AD SOIC
degree phase shift between SIG
IN
and COMP
IN
signals (duty cycle is
T
A
= -55° to 125° C for all packages
immaterial). The linear VCO produces an output signal VCO
OUT
whose
frequency is determined by the voltage of input VCO
IN
signal and the
capacitor and resistors connected to pins C1A, C1B, R1 and R2. The unity
gain op-amp output DEM
OUT
with an external resistor is used where the VCO
IN
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.
•
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 SIG
IN
and COMP
IN
)
•
Low Quiescent Current: 80
µA
Maximum (VCO disabled)
•
High Noise Immunity Characteristic of CMOS Devices
•
Diode Protection on all Inputs
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
PCP
OUT
PC1
OUT
COMP
IN
VCO
OUT
INH
C1A
C1B
GND
VCO
IN
DEM
OUT
R1
R2
PC2
OUT
SIG
IN
PC3
OUT
V
CC
Name and Function
Phase Comparator Pulse Output
Phase Comparator 1 Output
Comparator Input
VCO Output
Inhibit Input
Capacitor C1 Connection A
Capacitor C1 Connection B
Ground (0 V) V
SS
VCO Input
Demodulator Output
Resistor R1 Connection
Resistor R2 Connection
Phase Comparator 2 Output
Signal Input
Phase Comparator 3 Output
Positive Supply Voltage
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
