SE567D Просмотр технического описания (PDF) - Philips Electronics
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SE567D Datasheet PDF : 13 Pages
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Philips Semiconductors Linear Products
Tone decoder/phase-locked loop
Product specification
NE/SE567
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Center Frequency Temperature
Coefficient
(Mean and SD)
100
0
–100
–200
∆t = 0°C to 70°C
–300
4.5
5.0 5.5
6.0
6.5
SUPPLY VOLTAGE — V
DtO
tO ń V *
7.0
1.0
0.9
0.8
0.7
0.6
%ń V
0.5
0.4
0.3
0.2
0.1
0
1
Center Frequency
Shift With Supply
Voltage Change vs
Operating Frequency
2 3 4 5 10 20 40 100
CENTER FREQUENCY — kHz
Typical Bandwidth Variation
Temperature
15.0
14
12
12.5
10
10.0
8
7.5
6
5.0
4
2.5
2
BANDWIDTH AT 25°C
0
–75
–25 0 25
75
125
TEMPERATURE – °C
DESIGN FORMULAS
fO [
1
1.1R1 C1
BW [
Ǹ1070
VI
fO C2
in % of fO
VI v 200mVRMS
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)).
April 15, 1992
408
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