April 1985

5

Philips Semiconductors

Product specification

I.F. amplifier and demodulator for

multistandard TV receivers

TDA2549

Notes to the characteristics

1.

2. Measured in application of Fig. 5.

A.F.C. output voltage swing

10

−−

V

Change of frequency required for a.f.c.

output voltage swing of 10 V

∆f

−

70

200

kHz

A.F.C. switch off for a voltage lower than:

−−

1,5

V

A.F.C. inverter switch

positive a.f.c. (Fig.2)

0

−

1,5

V

negative a.f.c. (Fig.3)

4

−

12

V

Tuner A.G.C.

Leakage current

−−

15

µA

Saturation voltage

−

0,1

0,3

V

take-over point LOW

−−

3mV

take-over point HIGH

10

−−

mV

−−

0,5

dB

Negative modulation (Fig.4)

white spot inverter threshold level

−

4,6

−

V

white spot insertion level

−

3,2

−

V

noise inverter threshold level

−

0,9

−

V

noise insertion level

−

2,5

−

V

Positive modulation a.g.c. detector

reference level

3,0

3,2

3,4

V

0,7

1

1,4

V

Auxiliary video output

output signal (note 2)

−

1

−

V

top sync level

123V

output impedance

−

7

−Ω

Levels for video switches

positive video

−−

1V

negative video

3

−−

V

internally demodulated signal

−−

1V

auxiliary video signal

3

−−

V

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

Signal

to

–

noise ratio S/N

–

V

V

n rms

5 MHz

=

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=