CD4046BC Datasheet, PDF (1/14 Pages) Fairchild Semiconductor – Micropower Phase-Locked Loop

October 1987
Revised March 2002
CD4046BC
Micropower Phase-Locked Loop
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.
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.
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.
The linear voltage-controlled oscillator (VCO) produces an
output signal (VCO Out) whose frequency is determined by
the voltage at the VCO_IN input, and the capacitor and resis-
tors connected to pin C1_A, C1_B, R1 and R2.
The source follower output of the VCO_IN (demodulator Out)
is used with an external resistor of 10 kΩ 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
s Wide supply voltage range: 3.0V to 18V
s Low dynamic power consumption: 70 µW (typ.)
at f_o = 10 kHz, V_DD = 5V
s VCO frequency: 1.3 MHz (typ.) at V_DD = 10V
s Low frequency drift: 0.06%/°C at V_DD = 10V with
temperature
s High VCO linearity: 1% (typ.)
Applications
• FM demodulator and modulator
• Frequency synthesis and multiplication
• Frequency discrimination
• Data synchronization and conditioning
• Voltage-to-frequency conversion
• Tone decoding
• FSK modulation
• Motor speed control
Ordering Code:
Order Number Package Number
Package Description
CD4046BCM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
CD4046BCN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
© 2002 Fairchild Semiconductor Corporation DS005968
www.fairchildsemi.com