TDA4780 datasheet(21/44 Pages) PHILIPS

21 / 44 page

1997 Feb 06

Philips Semiconductors

Preliminary speciﬁcation

RGB video processor with automatic

cut-off control and gamma adjust

TDA4780

DIFFERENCES OF BLACK LEVEL STEPS (DIFFERENCES FROM CHANNEL TO CHANNEL OF THE RATIO OF THE DIFFERENCE

(BLACK LEVEL CUT-OFF MEASUREMENT LEVEL) TO ACTUAL NOMINAL SIGNAL AMPLITUDE (V

NOM

24,VNOM22,VNOM20) OVER THE

WHOLE CONTRAST

, BRIGHTNESS AND SATURATION RANGE, SWITCHING MATRIX OR SWITCHING FAST SWITCHES, GAMMA =1,

BLST = 0, ADBL = 0)

∆V/Vnom

static deviation

note 6; ripple on pin 5

during clamping

≤1mV;

note 7

−1.0

−

+1.0

at nominal saturation

−0.5

−

+0.5

RGB outputs (output for positive RGB signals (R: pin 24, G: pin 2, B: pin 20); following data without external

load)

R24, 22, 20

differential output resistance

−

Ω

I24, 22, 20(max)

maximum output current

4.0

5.0

−

V24, 22, 20(min)

minimum output voltage

note 8

−−

0.8

V24, 22, 20(max)

maximum output voltage

RL ≥ 2kΩ

6.3

7.0

−

V24, 22, 20(max)(p-p)

maximum signal amplitude (black-white)

due to internal limits

(peak-to-peak value)

3.3

−−

V24, 22, 20(max)(p-p)

nominal signal amplitude (black-white;

peak-to-peak value)

at nominal white adjust,

contrast and saturation

setting; gamma = 1;

nominal input signals

1.7

2.0

2.3

V24, 22, 20

cut-off measurement level

note 8

1.0

−

5.0

V24, 22, 20

recommended cut-off measurement

level

−

3.0

−

OUTPUT CLAMPING (RGB)

V20, 22, 24

clamp voltage black level

control bit BCOF = 1

2.3

2.5

2.7

WHITE POTENTIOMETERS

∆Gv(inc)(max)

maximum increase of AC gain

I2C-bus data 3FH;

relative to nominal

setting; note 9

∆Gv(dec)(max)

maximum decrease of AC gain

I2C-bus data 00H;

relative to nominal

setting; note 9

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX. UNIT

TDA4780 Datasheet(PDF) 21 Page - NXP Semiconductors

TDA4780 Datasheet(HTML) 21 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL