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MC14046B Arkusz danych(PDF) 1 Page - ON Semiconductor

Numer części MC14046B
Szczegółowy opis  Phase Locked Loop
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MOTOROLA CMOS LOGIC DATA
1
MC14046B
Phase Locked Loop
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 PCAin
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 PC1out,
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, PC2out and LD, and
maintains a 0
° phase shift between PCAin and PCBin signals (duty cycle is
immaterial). The linear VCO produces an output signal VCOout 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 SFout with an external resistor is used where the VCOin 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–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
PCAin
PCBin
VCOin
INH
14
3
9
5
VDD = PIN 16
VSS = PIN 8
2 PC1out
13 PC2out
1LD
4 VCOout
11 R1
12 R2
6C1A
7C1B
10 SFout
15 ZENER
VSS
SELF BIAS
CIRCUIT
PHASE
COMPARATOR 1
PHASE
COMPARATOR 2
VOLTAGE
CONTROLLED
OSCILLATOR
(VCO)
SOURCE FOLLOWER
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1
REV 4
© Motorola, Inc. 1997
10/97
MC14046B
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
12
5
4
3
2
1
8
7
6
R2
PC2out
PCAin
ZENER
VDD
VCOin
SFout
R1
VCOout
PCBin
PC1out
LD
VSS
C1B
C1A
INH


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