IN74HC4046A Datasheet, PDF (1/11 Pages) Integral Corp. – PHASE-LOCKED LOOP

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 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 50% duty cycle). Phase comparator
2 (with leading-edge sensing logic) provides digital error signals
PC2_OUT and PCP_OUT and maintains a 0 degree phase shift between
SIG_IN and COMP_IN signals (duty cycle is 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
ORDERING INFORMATION
IN74HC4046AN Plastic
IN74HC4046AD SOIC
T_A = -55° to 125° C for all
packages
PIN ASSIGNMENT
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
• 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.
Symbol
Name and Function
1
PCP_OUT
Phase Comparator Pulse Output
2
PC1_OUT
Phase Comparator 1 Output
3
COMP_IN
Comparator Input
4
VCO_OUT
VCO Output
5
INH
Inhibit Input
6
C1A
Capacitor C1 Connection A
7
C1B
Capacitor C1 Connection B
8
GND
Ground (0 V) V_SS
9
VCO_IN
VCO Input
10
DEM_OUT
Demodulator Output
11
R1
Resistor R1 Connection
12
R2
Resistor R2 Connection
13
PC2_OUT
Phase Comparator 2 Output
14
SIG_IN
Signal Input
15
PC3_OUT
Phase Comparator 3 Output
16
V_CC
Positive Supply Voltage
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