NE567D NXP Semiconductors, NE567D Datasheet - Page 8

• Manufacturer Part Number: NE567D
• Manufacturer: NXP Semiconductors

Specifications of NE567D

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Package Type: SO
• Pin Count: 8
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

The free-running frequency of the current controlled oscillator (CCO)
The frequency range, centered about f
above the threshold voltage (typically 20 mV
of the detection band. The skew can be reduced to zero if necessary
Philips Semiconductors
DESIGN FORMULAS
Where
PHASE-LOCKED LOOP TERMINOLOGY CENTER
FREQUENCY (f
in the absence of an input signal.
Detection bandwidth (BW)
zero state on the output. The detection bandwidth corresponds to
the loop capture range.
Lock range
The largest frequency range within which an input signal above the
threshold voltage will hold a logical zero state on the output.
Detection band skew
A measure of how well the detection band is centered about the
center frequency, f
where f
by means of an optional centering adjustment.
OPERATING INSTRUCTIONS
Figure 16 shows a typical connection diagram for the 567. For most
applications, the following three-step procedure will be sufficient for
choosing the external components R
1. Select R1 and C1 for the desired center frequency. For best
2. Select the low-pass capacitor, C2, by referring to Figure 4,
2002 Sep 25
V
C
Tone decoder/phase-locked loop
BW
f
temperature stability, R1 should be between 2 k and 20 k ,
and the combined temperature coefficient of the R1C1 product
should have sufficient stability over the projected temperature
range to meet the necessary requirements.
‘Bandwidth vs. input signal amplitude’. If the input amplitude
variation is known, the appropriate value of f
give the desired bandwidth may be found. Conversely, an area
of operation may be selected on this graph and the input level
and C2 may be adjusted accordingly. For example, constant
bandwidth operation requires that input amplitude be above
200mV
controlled solely by the f
I
2
O
f
= Input voltage (V
MAX
= Low-pass filter capacitor ( F)
MAX
1.1R
V
1070
RMS
I
2f
f
and f
MIN
1
O
1
. The bandwidth, as noted on the graph, is then
200mV
C
MIN
1
O
f
2f
O
. The skew is defined as:
O
V
are the frequencies corresponding to the edges
O
C
)
I
RMS
RMS
2
in % of f
)
O
C
2
product (f
O
1
, C
O
, within which an input signal
1
, C
O
RMS
2
(Hz), C2( F)).
and C
O
) will cause a logical
C
3
2
.
necessary to
8
3. The value of C3 is generally non-critical. C3 sets the band edge
4. Optional resistor R2 sets the threshold for the largest “no output”
TYPICAL RESPONSE
input voltage. A value of 130 k is used to assure the tested limit
desirable to avoid spurious outputs due to transient frequencies.)
of a low-pass filter which attenuates frequencies outside the
detection band to eliminate spurious outputs. If C3 is too small,
frequencies just outside the detection band will switch the output
stage on and off at the beat frequency, or the output may pulse
on and off during the turn-on transient. If C3 is too large, turn-on
and turn-off of the output stage will be delayed until the voltage
on C
A typical minimum value for C
of 10 mV
increased sensitivity. The explanation can be found in the
“optional controls” section which follows.
3
passes the threshold voltage. (Such delay may be
f
O
NOTE:
R
RMS
NOTES:
S/N = –6dB
R
Noise Bandwidth = 140Hz
L
Response to 100mV
L
INPUT
Response to Same Input Tone Burst
= 100
= 100
OUTPUT
OUTPUT
R 1 C 1
min. This resistor can be referenced to ground for
INPUT
INPUT
1
Figure 16. Typical connection
Figure 17. Typical response
C
R
1
1
With Wideband Noise
3
5
6
2
C
LOW
PASS
FILTER
3
2
is 2C
RMS
567
Tone Burst
2
NE567/SE567
+V
4
7
.
1
8
SL00554
C
OUTPUT
FILTER
3
+V
R
2
R
Product data
L
SL00553