MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
MC14046B
Phase Locked Loop
The MC14046B phase locked loop contains two phase comparators, a
voltage鈥揷ontrolled oscillator (VCO), source follower, and zener diode. The
comparators have two common signal inputs, PCAin and PCBin. Input PCAin
can be used directly coupled to large voltage signals, or indirectly coupled
(with a series capacitor) to small voltage signals. The self鈥揵ias 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掳 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掳 phase shift between PCA in and PCB 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 and the capacitor and
resistors connected to pins C1A, C1B, R1, and R2. The source鈥揻ollower
output SFout with an external resistor is used where the VCO in 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, fre-
quency synthesis and multiplication, frequency discrimination, tone decod-
ing, data synchronization and conditioning, voltage鈥搕o鈥揻requency
conversion and motor speed control.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Buffered Outputs Compatible with MHTL and Low鈥揚ower TTL
Diode Protection on All Inputs
Supply Voltage Range = 3.0 to 18 V
Pin鈥揻or鈥揚in 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
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
TA = 鈥?55掳 to 125掳C for all packages.
PIN ASSIGNMENT
LD
PC1out
PCBin
VCOout
INH
C1A
C1B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
ZENER
PCAin
PC2out
R2
R1
SFout
VCOin
BLOCK DIAGRAM
SELF BIAS
CIRCUIT
PHASE
COMPARATOR 1
PHASE
COMPARATOR 2
VOLTAGE
CONTROLLED
OSCILLATOR
(VCO)
SOURCE FOLLOWER
VSS
VSS
PCAin 14
PCBin 3
VCOin 9
VDD = PIN 16
VSS = PIN 8
INH 5
2 PC1out
13 PC2out
1 LD
4
11
12
6
7
VCOout
R1
R2
C1A
C1B
10 SFout
15 ZENER
REV 3
1/94
漏
MOTOROLA CMOS LOGIC DATA
Motorola, Inc. 1995
MC14046B
1
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