1996 Jan 26

28

Philips Semiconductors

Objective specification

TDA8376; TDA8376A

Notes

1. Signal with negative-going sync. Amplitude includes sync pulse amplitude.

2. This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix

batches which are made in the pilot production period.

3. This parameter is measured at nominal settings of the various controls.

4. Indicated is a signal for a colour bar with 75% saturation (chrominance : burst ratio = 2.2 : 1).

5. The RGB1 inputs (pins 14 to 17) have priority over the RGB2 inputs (pins 23 to 25).

6. Nominal contrast is specified with the DAC in position 20H. Nominal saturation as maximum

−10 dB. In the nominal

brightness setting the black level at the outputs is identical to the level of the black-current measuring pulses.

7. This parameter is not tested during production and is just given as application information for the designer of the

television receiver.

8. The

−3 dB bandwidth of the circuit can be calculated by means of the following equation:

9. Valid for a signal amplitude on the Y-input of 0.7 V black-to-white (100 IRE) with a rise time (10% to 90%) of 70 ns

and the video switch in the Y/C mode. During production the peaking function is not tested by measuring the

overshoots but by measuring the frequency response of the Y output.

10. For video signals with a black level which deviates from the back-porch blanking level the signal is ‘stretched’ to the

blanking level. The amount of correction depends on the IRE value of the signal (see Fig.10). The black level is

detected by the capacitor connected to pin 2. The black level stretcher can be made inoperative by connecting pin 2

to the positive supply line. The values given are valid only when the luminance input signal (pins 7, 9 and 13) has a

value of 1 V (p-p).

11. The slicing level is independent of sync pulse amplitude. The given percentage is the distance between the slicing

level and the black level (back porch).

contrast reduction starting voltage

−

3.5

−

V

voltage difference for full contrast

reduction

−

2.0

−

V

brightness reduction starting voltage

−

2.5

−

V

voltage difference for full brightness

reduction

−

1.0

−

V

internal bias voltage

−

4.5

−

V

internal charge current

−

25

−µA

discharge current due to ‘peak-white

limiting’

−

200

−µA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

f

3dB

–

f

1

2Q

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–





=