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NE567N Datasheet(PDF) 6 Page - NXP Semiconductors |
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NE567N Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 13 page ![]() 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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