SEMICONDUCTOR TECHNICAL DATA
L SUFFIX
CERAMIC
CASE 620
The MC14046B phase locked loop contains two phase comparators, a
voltage–controlled oscillator (VCO), source follower, and zener diode. The
comparators have two common signal inputs, PCA and PCB . Input PCA
in in
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
P SUFFIX
PLASTIC
CASE 648
comparator 1 (an exclusive OR gate) provides a digital error signal PC1
,
out
and maintains 90° phase shift at the center frequency between PCA and
in
PCB signals (both at 50% duty cycle). Phase comparator 2 (with leading
in
edge sensing logic) provides digital error signals, PC2
and LD, and
out
DW SUFFIX
SOIC
CASE 751G
maintains a 0° phase shift between PCA and PCB signals (duty cycle is
in in
immaterial). The linear VCO produces an output signal VCO
whose
out
frequency is determined by the voltage of input VCO and the capacitor and
in
resistors connected to pins C1 , C1 , R1, and R2. The source–follower
A
B
ORDERING INFORMATION
output SF
with an external resistor is used where the VCO signal is
in
out
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
needed but no loading can be tolerated. The inhibit input Inh, when high,
disables the VCO and source follower to minimize standby power
consumption. The zener diode can be used to assist in power supply
regulation.
T
A
= – 55° to 125°C for all packages.
Applications include FM and FSK modulation and demodulation, fre-
quency synthesis and multiplication, frequency discrimination, tone decod-
ing, data synchronization and conditioning, voltage–to–frequency
conversion and motor speed control.
PIN ASSIGNMENT
LD
out
1
2
16
15
V
DD
ZENER
•
•
•
•
•
•
Buffered Outputs Compatible with MHTL and Low–Power TTL
Diode Protection on All Inputs
Supply Voltage Range = 3.0 to 18 V
PC1
PCB
3
4
5
6
7
8
14
13
12
11
10
9
PCA
in
in
Pin–for–Pin Replacement for CD4046B
VCO
PC2
R2
out
out
Phase Comparator 1 is an Exclusive Or Gate and is Duty Cycle Limited
Phase Comparator 2 switches on Rising Edges and is not Duty Cycle
Limited
INH
C1
A
R1
C1
SF
B
out
V
VCO
SS
in
BLOCK DIAGRAM
SELF BIAS
CIRCUIT
PHASE
COMPARATOR 1
PCA 14
in
2
PC1
out
PHASE
COMPARATOR 2
13 PC2
out
PCB
VCO
3
9
1
LD
in
4
VCO
VOLTAGE
CONTROLLED
OSCILLATOR
(VCO)
out
in
11 R1
12 R2
V
V
= PIN 16
= PIN 8
6
7
C1
C1
DD
SS
A
B
SOURCE FOLLOWER
10 SF
out
15 ZENER
INH
5
V
SS
10/97
REV 4
1
MMotOoroTlaO, IRncO. 1L9A97CMOS LOGIC DATA
MC14046B
1