Philips TDA8303A Manual De Usuario

July 1992

3

Philips Semiconductors

Preliminary specification

Small signal combination IC for black/white TV

TDA8303

TDA8303A

1. Pin 11 has a double function. When during switch-on a current of 9 mA is supplied to this pin, it is used to start the

horizontal oscillator. The main supply can then be obtained from the horizontal deflection stage. When no current is
supplied to this pin it can be used as a volume control.

2. On set AGC.

3. The output signal is measured at

∆

f = 7.5 kHz and maximum volume control.

4. The minimum value is obtained by connecting a 1.8 k

Ω

resistor and a 470 nF capacitor in series between the video

output and pin 25. The slicing level can be varied by changing the value of this resistor (higher resistance value
results in a larger value of the minimum sync pulse amplitude). The slicing level is independent of the video
information.

V

P

positive supply voltage (pin 7)

9.5

12

13.2

V

I

P

supply current (pin 7)

90

125

160

mA

I

start

start current (pin 11)

note 1

−

6.5

9

mA

V

8-9(RMS)

IF sensitivity (RMS value)

at 38.9 MHz;
note 2

20

40

65

µ

V

G

8-9

IF gain control range

−

74

−

dB

S/N

signal-to-noise ratio

input signal =
10 mV

−

57

−

dB

V

18(p-p)

AFC output voltage swing
(peak-to-peak value)

10.5

−

11.5

V

V

12(RMS)

AF output signal (RMS value)

note 3

400

600

800

mV

AMS

AM suppression

at V

I

 = 50 mV

−

58

−

dB

THD

total harmonic distortion

−

0.5

−

%

V

25

required sync pulse amplitude

note 4

200

−

−

mV

I

27

required input current during flyback pulse

0.1

−

2

mA

V

22

coincidence detector output voltage

in synchronized condition

−

9.7

−

V

in no signal condition

−

1.5

−

V

V

22

vertical feedback for DC voltage

2.9

3.3

3.7

V

V

22(p-p)

vertical feedback for AC voltage
(peak-to-peak value)

−

1.2

−

V