1997 Feb 06

18

Philips Semiconductors

Preliminary specification

RGB video processor with automatic

cut-off control and gamma adjust

TDA4780

CHARACTERISTICS

gamma = 1; adaptive black inactive; brightness, contrast, saturation and white balance at nominal settings; no beam

current or peak drive limiting; all voltages are related to ground (pin 9) and measured in Figs 1 and 2; unless otherwise

specified.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX. UNIT

supply voltage (pin 5)

7.2

8

8.8

V

supply current (pin 5)

−

100

120

mA

Colour-difference inputs (

−(B − Y): pin 6, −(R − Y): pin 7; capacitively coupled to a low-ohmic source;

recommendation: maximum 600

Ω)

−(B − Y) signal (peak-to-peak value)

75% colour bar signal

−

1.33

−

V

internal bias during clamping

−

4.0

−

V

DC input current between clamping

pulses

−−

0.1

µA

maximum input current during clamping

100

180

260

µA

−(R − Y) signal (peak-to-peak value)

75% colour bar signal

−

1.05

−

V

AC input resistance

10.0

−−

M

Ω

Y input (pin 8; capacitively coupled to a low-ohmic source; recommendation: maximum 600

Ω)

input signal (composite signal; VBS;

peak-to-peak value)

adaption to two

different signal levels

via control bit YHI

YHI = 0

−

0.45

−

V

YHI = 1

−

1.43

−

V

AC input resistance

10.0

−−

M

Ω

internal bias during clamping

YHI = 0

−

3.7

−

V

YHI = 1

−

4.6

−

V

DC input current between clamping

pulses

−−

0.1

µA

maximum input current during clamping

100

180

260

µA

recommendation: maximum 600

Ω); note 1

input signal (peak-to-peak value)

−

0.7

−

V

AC input resistance

10.0

−−

M

Ω

internal bias during clamping

−

5.1

−

V

DC input current between clamping

pulses

−−

0.1

µA

maximum input current during clamping

100

180

260

µA