January 1992

8

Philips Semiconductors

Preliminary specification

Quasi-split sound processor with two FM demodulators

TDA3867T

Limiting amplifiers (pins 18 and 22)

minimum input signal (RMS value)

−3 dB AF signal

−

300

450

µV

maximum input signal (RMS value)

200

−−

mV

input resistance

−

560

−Ω

DC voltage

−

0

−

V

level detector threshold for no muting

(RMS value, pin 22)

only 5.74 MHz channel

−

1

−

mV

∆V

i

hysteresis of level detector

−

5

−

dB

Tracking automatic frequency control (AFC) of the vision carrier reference circuit.

tracking output voltage range (pin 16)

note 5

tracking reducing factor for

black picture

−

9

−

white test picture

−

4

−

50 % grey picture

−

6

−

S

AFC steepness (open loop) for

black picture

−−8

−

mV/kHz

white test picture

−−3

−

mV/kHz

50 % grey picture

−−5.5

−

mV/kHz

FM1 and FM2 demodulators

De-emphasis of 50

intercarrier signals

(RMS values, pins 7-8 and 11-12)

−

100

−

mV

DC voltage (pins 7, 8, 11 and 12)

−

1.8

−

V

AF output signals

(RMS values, pins 9 and 10)

0.75

0.95

1.20

V

difference of AF signals

between channels (pins 9 and 10)

pin 6 open-circuit;

note 2

−−

1dB

output resistance

−

100

−Ω

DC voltage

−

2.1

−

V

allowed AC current of emitter output

(peak value)

note 3

−−

±1.5

mA

maximum allowed DC output current

−−

−2mA

THD

total harmonic distortion

−

0.5

1.0

%

AF output signal (RMS value)

THD = 1.5 %

1.25

−−

V

α

AM

AM suppression

1 kHz, m = 0.3

48

54

−

dB

S/N(W)

weighted signal-to-noise ratio

CCIR 468-3

64

68

−

dB

B

AF bandwidth

−3 dB

0.02

−

100

kHz

crosstalk attenuation (pins 9-10)

60

70

−

dB

adjusting voltage for AF2 signal (pin 6)

note 4

0

−

5V

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT