MOTOROLA CMOS LOGIC DATA
1
MC14046B
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, PCAin and PCBin. Input PCA
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° phase shift at the center frequency between PCAin and
PCBin signals (both at 50% duty cycle). Phase comparator 2 (with leading
edge sensing logic) provides digital error signals, PC2
out
and LD, and
maintains a 0° phase shift between PCAin and PCBin signals (duty cycle is
immaterial). The linear VCO produces an output signal VCO
out
whose
frequency is determined by the voltage of input VCOin and the capacitor and
resistors connected to pins C1A, C1B, R1, and R2. The source–follower
output SF
out
with an external resistor is used where the VC Oin signal is
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.
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.
• Buffered Outputs Compatible with MHTL and Low–Power TTL
• Diode Protection on All Inputs
• Supply Voltage Range = 3.0 to 18 V
• Pin–for–Pin Replacement for CD4046B
• 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
BLOCK DIAGRAM
PCA
in
PCB
in
VCO
in
INH
14
3
9
5
VDD = PIN 16
VSS = PIN 8
2 PC1
out
13 PC2
out
1LD
4 VCO
out
11 R1
12 R2
6C1
A
7C1
B
10 SF
out
15 ZENERV
SS
SELF BIAS
CIRCUIT
PHASE
COMPARATOR 1
PHASE
COMPARATOR 2
VOLTAGE
CONTROLLED
OSCILLATOR
(VCO)
SOURCE FOLLOWER
SEMICONDUCTOR TECHNICAL DATA
1
REV 4
Motorola, Inc. 1997
10/97
L SUFFIX
CERAMIC
CASE 620
ORDERING INFORMATION
MC14XXXBCP Plastic
MC14XXXBCL Ceramic
MC14XXXBDW SOIC
TA = – 55° to 125°C for all packages.
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
PIN ASSIGNMENT
13
14
15
16
9
10
11
125
4
3
2
1
8
7
6
R2
PC2
out
PCA
in
ZENER
V
DD
VCO
in
SF
out
R1
VCO
out
PCB
in
PC1
out
LD
V
SS
C1
B
C1
A
INH