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HEF4046B Datasheet(PDF) 3 Page - NXP Semiconductors

Part # HEF4046B
Description  Phase-locked loop
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

HEF4046B Datasheet(HTML) 3 Page - NXP Semiconductors

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January 1995
3
Philips Semiconductors
Product specification
Phase-locked loop
HEF4046B
MSI
Fig.2 Pinning diagram.
PINNING
1. Phase comparator pulse output
2. Phase comparator 1 output
3. Comparator input
4. VCO output
5. Inhibit input
6. Capacitor C1 connection A
7. Capacitor C1 connection B
8. VSS
9. VCO input
10. Source-follower output
11. Resistor R1 connection
12. Resistor R2 connection
13. Phase comparator 2 output
14. Signal input
15. Zener diode input for regulated supply.
FUNCTIONAL DESCRIPTION
VCO part
The VCO requires one external capacitor (C1) and one or
two external resistors (R1 or R1 and R2). Resistor R1 and
capacitor C1 determine the frequency range of the VCO.
Resistor R2 enables the VCO to have a frequency off-set
if required. The high input impedance of the VCO simplifies
the design of low-pass filters; it permits the designer a wide
choice of resistor/capacitor ranges. In order not to load the
low-pass filter, a source-follower output of the VCO input
voltage is provided at pin 10. If this pin (SFOUT) is used, a
load resistor (RSF) should be connected from this pin to
VSS; if unused, this pin should be left open. The VCO
output (pin 4) can either be connected directly to the
comparator input (pin 3) or via a frequency divider. A LOW
level at the inhibit input (pin 5) enables the VCO and the
source follower, while a HIGH level turns off both to
minimize stand-by power consumption.
Phase comparators
The phase-comparator signal input (pin 14) can be
direct-coupled, provided the signal swing is between the
standard HE4000B family input logic levels. The signal
must be capacitively coupled to the self-biasing amplifier
at the signal input in case of smaller swings. Phase
comparator 1 is an EXCLUSIVE-OR network. The signal
and comparator input frequencies must have a 50% duty
factor to obtain the maximum lock range. The average
output voltage of the phase comparator is equal to 1
2 VDD
when there is no signal or noise at the signal input. The
average voltage to the VCO input is supplied by the
low-pass filter connected to the output of phase
comparator 1. This also causes the VCO to oscillate at the
centre frequency (fo). The frequency capture range (2 fc) is
defined as the frequency range of input signals on which
the PLL will lock if it was initially out of lock. The frequency
lock range (2 fL) is defined as the frequency range of input
signals on which the loop will stay locked if it was initially
in lock. The capture range is smaller or equal to the lock
range.
With phase comparator 1, the range of frequencies over
which the PLL can acquire lock (capture range) depends
on the low-pass filter characteristics and this range can be
made as large as the lock range. Phase comparator 1
enables the PLL system to remain in lock in spite of high
amounts of noise in the input signal. A typical behaviour of
this type of phase comparator is that it may lock onto input
frequencies that are close to harmonics of the VCO centre
frequency. Another typical behaviour is, that the phase
angle between the signal and comparator input varies
between 0
° and 180° and is 90° at the centre frequency.
Figure 3 shows the typical phase-to-output response
characteristic.


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