October 1987
Revised January 1999
CD4046BC
Micropower Phase-Locked Loop
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.
General Description
The CD4046BC 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.
Features
■ Wide supply voltage range: 3.0V to 18V
■ Low dynamic power consumption: 70 µW (typ.) at fo
10 kHz, VDD = 5V
=
Phase comparator I, an exclusive OR gate, provides a digi-
tal 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 har-
monics of the VCO center frequency.
■ VCO frequency: 1.3 MHz (typ.) at VDD = 10V
■ Low frequency drift: 0.06%/°C at VDD = 10V with tem-
perature
■ High VCO linearity: 1% (typ.)
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
input and comparator input.
Applications
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FM demodulator and modulator
Frequency synthesis and multiplication
Frequency discrimination
Data synchronization and conditioning
Voltage-to-frequency conversion
Tone decoding
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.
FSK modulation
The source follower output of the VCOIN (demodulator Out)
Motor speed control
is used with an external resistor of 10 kΩ or more.
Ordering Code:
Order Number Package Number
Package Description
CD4046BCM
M16A
16-Lead Small Outline integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
CD4046BCN
N16E
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Assignments for SOIC and DIP
Top View
© 1999 Fairchild Semiconductor Corporation
DS005968.prf
www.fairchildsemi.com