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NE567N Datasheet(PDF) 6 Page - NXP Semiconductors

Part # NE567N
Description  Tone decoder/phase-locked loop
Download  13 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

NE567N Datasheet(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors Linear Products
Product specification
NE/SE567
Tone decoder/phase-locked loop
April 15, 1992
408
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Center Frequency Temperature
Coefficient
(Mean and SD)
Center Frequency
Shift With Supply
Voltage Change vs
Operating Frequency
Typical Bandwidth Variation
Temperature
100
0
–100
–200
–300
4.5
5.0
5.5
6.0
6.5
7.0
SUPPLY VOLTAGE — V
∆t = 0°C to 70°C
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
2
3 4 5
10
20
40
100
CENTER FREQUENCY — kHz
Dt
O
t
O
V
*
% V
15.0
12.5
10.0
7.5
5.0
2.5
0
–75
–25
0
25
75
125
TEMPERATURE –
°C
BANDWIDTH AT 25
°C
2
4
6
8
10
12
14
DESIGN FORMULAS
f
O [
1
1.1R
1 C1
BW
[
1070
V
I
f
O C2
in % of f
O
V
I v
200mV
RMS
Where
VI=Input voltage (VRMS)
C2=Low-pass filter capacitor (µF)
PHASE-LOCKED LOOP TERMINOLOGY CENTER
FREQUENCY (fO)
The free-running frequency of the current controlled oscillator (CCO)
in the absence of an input signal.
Detection Bandwidth (BW)
The frequency range, centered about fO, within which an input signal
above the threshold voltage (typically 20mVRMS) will cause a logical
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, fO. The skew is defined as (fMAX+fMIN-2fO)/2fO
where fmax and fmin are the frequencies corresponding to the
edges of the detection band. The skew can be reduced to zero if
necessary by means of an optional centering adjustment.
OPERATING INSTRUCTIONS
Figure 1 shows a typical connection diagram for the 567. For most
applications, the following three-step procedure will be sufficient for
choosing the external components R1, C1, C2 and C3.
1. Select R1 and C1 for the desired center frequency. For best
temperature stability, R1 should be between 2K and 20K ohm,
and the combined temperature coefficient of the R1C1 product
should have sufficient stability over the projected temperature
range to meet the necessary requirements.
2. Select the low-pass capacitor, C2, by referring to the Bandwidth
versus Input Signal Amplitude graph. If the input amplitude
Variation is known, the appropriate value of fO ⋅ C2 necessary to
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
200mVRMS. The bandwidth, as noted on the graph, is then
controlled solely by the fO ⋅ C2 product (fO (Hz), C2(µF)).


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