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CD4046BM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CD4046BM
Beschreibung Micropower Phase-Locked Loop
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 14 Seiten
CD4046BM Datasheet, Funktion
November 1995
CD4046BM CD4046BC Micropower Phase-Locked Loop
General Description
The CD4046B micropower phase-locked loop (PLL) con-
sists of a low power linear voltage-controlled oscillator
(VCO) a source follower a zener diode and two phase
comparators The two phase comparators have a common
signal input and a common comparator input The signal
input can be directly coupled for a large voltage signal or
capacitively coupled to the self-biasing amplifier at the sig-
nal input for a small voltage signal
Phase comparator I an exclusive OR gate provides a digital
error signal (phase comp I Out) and maintains 90 phase
shifts at the VCO center frequency Between signal input
and comparator input (both at 50% duty cycle) it may lock
onto the signal input frequencies that are close to harmon-
ics of the VCO center frequency
Phase comparator II is an edge-controlled digital memory
network It provides a digital error signal (phase comp II
Out) and lock-in signal (phase pulses) to indicate a locked
condition and maintains a 0 phase shift between signal in-
put and comparator input
The linear voltage-controlled oscillator (VCO) produces an
output signal (VCO Out) whose frequency is determined by
the voltage at the VCOIN input and the capacitor and resis-
tors connected to pin C1A C1B R1 and R2
The source follower output of the VCOIN (demodulator Out)
is used with an external resistor of 10 kX or more
The INHIBIT input when high disables the VCO and source
follower to minimize standby power consumption The zener
diode is provided for power supply regulation if necessary
Features
Y Wide supply voltage range
3 0V to 18V
Y Low dynamic
power consumption
Y VCO frequency
Y Low frequency drift
with temperature
70 mW (typ ) at
fo e 10 kHz VDD e 5V
1 3 MHz (typ ) at VDD e 10V
0 06% C at VDD e 10V
Y High VCO linearity
1% (typ )
Applications
Y FM demodulator and modulator
Y Frequency synthesis and multiplication
Y Frequency discrimination
Y Data synchronization and conditioning
Y Voltage-to-frequency conversion
Y Tone decoding
Y FSK modulation
Y Motor speed control
Block Connection Diagrams
Dual-In-Line Package
FIGURE 1
C1995 National Semiconductor Corporation TL F 5968
Top View
TL F 5968 – 2
Order Number CD4046B
TL F 5968 – 1
RRD-B30M115 Printed in U S A






CD4046BM Datasheet, Funktion
Phase Comparator State Diagrams
Typical Waveforms
FIGURE 2
TL F 5968 – 3
TL F 5968–4
FIGURE 3 Typical Waveform Employing Phase
Comparator I in Locked Condition
TL F 5968 – 5
FIGURE 4 Typical Waveform Employing Phase
Comparator II in Locked Condition
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