NE567 datasheet(6/13 Pages) PHILIPS

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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

–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

3 4 5

100

CENTER FREQUENCY — kHz

% V

15.0

12.5

10.0

7.5

5.0

2.5

–75

–25

125

TEMPERATURE –

°C

BANDWIDTH AT 25

°C

DESIGN FORMULAS

O [

1.1R

1 C1

[

1070

O C2

in % of f

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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