NJM567D NJR, NJM567D Datasheet - Page 8

IC TONE-DECODER/PH-LCKDLOOP 8DIP

NJM567D

Manufacturer Part Number
NJM567D
Description
IC TONE-DECODER/PH-LCKDLOOP 8DIP
Manufacturer
NJR
Type
Phase Lock Loop (PLL)r
Datasheet

Specifications of NJM567D

Pll
Yes
Input
Clock
Output
Clock
Number Of Circuits
1
Ratio - Input:output
1:1
Differential - Input:output
No/No
Frequency - Max
500kHz
Divider/multiplier
No/No
Voltage - Supply
4.75 V ~ 9 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
8-DIP
Frequency-max
500kHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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quadrature phase detector (lock detector) output cause the output stage to move through its threshold more than once.
Many loads, for example lamps and relays, will not respond to the chatter. However, logic may recognize the chatter as a
series of outputs. By feeding the output stage output back to its input (pin 1) the chatter can be eliminated. Three
schemes for doing this are given in Figure 4. All operate by feeding the first output step (either on or off) back to the input,
pushing the input past the threshold until the transient conditions are over. It is only necessary to assure that the feedback
time constant is not so large as to prevent operation at the highest anticipated speed. Although chatter can always be
eliminated by making C
Note that if the feedback time constant is made quite large, a short burst at the input frequency can be stretched into a
long output pulse This may be useful to drive, for example, stepping relays.
range, the circuits shown above can be used. By moving the detection band to one edge of the range, for example, input
signal variations will expand the detection band in only one direction. This may prove useful when a strong but
undesirable signal is expected on one side or the other of the center frequency. Since R
this method may be used to obtain a precise duty cycle when the 567 is used as an oscillator.
◎ Chatter Prevention (Figure 4)
◎ Detection Band Centering (or Skew) Adjustment (Figure 5)
- 8 -
Chatter occurs in the output stage when C
When it is desired to alter the location of the detection band (corresponding to the loop capture range) within the lock
3
large, the feedback circuit will enable faster operation of the 567 by allowing C
3
is relatively small, so that the lock transient and the AC components at the
Figure 4
Figure 5
B
also alters the duty cycle slightly,
3
to be kept small.
Ver.2003-12-09