NE567N NXP Semiconductors, NE567N Datasheet - Page 10

• Manufacturer Part Number: NE567N
• Manufacturer: NXP Semiconductors

Specifications of NE567N

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Package Type: PDIP
• Pin Count: 8
• Mounting: Through Hole
• Lead Free Status / Rohs Status: Compliant

minimum lock-up time is not achievable. We must simply wait for the
about 10 cycles per bit, corresponding to an information transfer rate
Philips Semiconductors
SPEED OF OPERATION
Minimum lock-up time is related to the natural frequency of the loop.
The lower it is, the longer becomes the turn-on transient. Thus,
maximum operating speed is obtained when C
When the signal is first applied, the phase may be such as to initially
drive the controlled oscillator away from the incoming frequency
rather than toward it. Under this condition, which is of course
unpredictable, the lock-up transient is at its worst and the theoretical
transient to die out.
The following expressions give the values of C
highest operating speeds for various band center frequencies. The
minimum rate at which digital information may be detected without
information loss due to the turn-on transient or output chatter is
of f
In cases where turn-off time can be sacrificed to achieve fast
turn-on, the optional sensitivity adjustment circuit can be used to
move the quiescent C
voltage). However, sensitivity to beat frequencies, noise and
extraneous signals will be increased.
OPTIONAL CONTROLS
The 567 has been designed so that, for most applications, no
external adjustments are required. Certain applications, however,
will be greatly facilitated if full advantage is taken of the added
control possibilities available through the use of additional external
components. In the diagrams given, typical
values are suggested where applicable. For best results the
resistors used, except where noted, should have the same
temperature coefficient. Ideally, silicon diodes would be
low-resistivity types, such as forward-biased transistor base-emitter
junctions. However, ordinary low-voltage diodes should be adequate
for most applications.
2002 Sep 25
Tone decoder/phase-locked loop
C
C
O
/10 baud.
2
3
130
260
f
f
O
O
F
F
3
voltage lower (closer to the threshold
(Figure 19)
2
2
is at a minimum.
and C
3
which allow
10
out-band signal rejection. This will inevitably slow the response time.
SENSITIVITY ADJUSTMENT
When operated as a very narrow-band detector (less than 8%), both
C
If, however, the output stage is biased closer to the threshold level,
the turn-on time can be improved. This is accomplished by drawing
additional current to terminal 1. Under this condition, the 567 will
also give an output for lower-level signals (10 mV or lower).
By adding current to terminal 1, the output stage is biased further
away from the threshold voltage. This is most useful when, to obtain
maximum operating speed, C
Normally, frequencies just outside the detection band could cause
false outputs under this condition. By desensitizing the output stage,
the out-band beat notes do not feed through to the output stage.
Since the input level must be somewhat greater when the output
stage is made less sensitive, rejection of third harmonics or in-band
harmonics (of lower frequency signals) is also improved.
2
and C
3
are made quite large in order to improve noise and
DECREASE
SENSITIVITY
567
567
Figure 19. Sensitivity adjustment
1
1
V+
R
C
3
R
C
50k
A
3
2
and C
V+
1.0k
2.5k
R
R
3
B
C
(Figure 19)
are made very small.
INCREASE
SENSITIVITY
SILICON
DIODES FOR
TEMPERATURE
COMPENSATION
(OPTIONAL)
NE567/SE567
567
DECREASE
SENSITIVITY
INCREASE
SENSITIVITY
1
SL00556
C
3
R
Product data