Philips Semiconductors Linear Products

Product specification

NE/SE567

Tone decoder/phase-locked loop

April 15, 1992

409

TYPICAL RESPONSE

Response to Same Input Tone Burst

With Wideband Noise

INPUT

OUTPUT

OUTPUT

INPUT

NOTES:

NOTE:

RL = 100Ω

S/N = –6dB

Noise Bandwidth = 140Hz

RL = 100Ω

3. The value of C3 is generally non-critical. C3 sets the band edge

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

Figure 1.

INPUT

3

5

6

2

7

1

8

4

+V

+V

OUTPUT

FILTER

LOW

PASS

FILTER

567

R1

RL

R2

C3

C2

C1

f

O +

1

R

1

C

1

threshold voltage. (Such delay may be desirable to avoid spurious

outputs due to transient frequencies.) A typical minimum value for

4. Optional resistor R2 sets the threshold for the largest “no output”

input voltage. A value of 130k

Ω is used to assure the tested limit

increased sensitivity. The explanation can be found in the

“optional controls” section which follows.

The primary output is the uncommitted output transistor collector,

Pin 8. When an in-band input signal is present, this transistor

saturates; its collector voltage being less than 1.0 volt (typically

0.6V) at full output current (100mA). The voltage at Pin 2 is the

phase detector output which is a linear function of frequency over

of frequency deviation. The average voltage at Pin 1 is, during lock,

a function of the in-band input amplitude in accordance with the

transfer characteristic given. Pin 5 is the controlled oscillator square

average of +V/2. A 1k

Ω load may be driven from pin 5. Pin 6 is an

high impedance loads may be

Figure 2. Typical Output Response

THRESHOLD VOLTAGE

VREF

4.0

3.5

3.0

2.5

0

100

200mVrms

IN-BAND

INPUT

VOLTAGE

PIN 1

VOLTAGE

(AVG)

f1 = fO

7%

BW

VCE (SAT) < 1.0V

14%

V+

0

3.9V

3.8V

3.7V

1.1fO

fO

0.9fO

LOW PASS

FILTER

(PIN 2)

OUTPUT

(PIN 8)