TDA4780 Datasheet, PDF (18/44 Pages) NXP Semiconductors – RGB video processor with automatic cut-off control and gamma adjust

Philips Semiconductors
RGB video processor with automatic
cut-off control and gamma adjust
Preliminary specification
TDA4780
CHARACTERISTICS
V_P = 8 V; T_amb = +25 °C; V_nom: nominal signal amplitude (black-white) 2 000 mV (peak-to-peak value) at output pins;
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
V_P
supply voltage (pin 5)
I_P
supply current (pin 5)
7.2 8
8.8 V
−
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)
V_6(p-p)
V_{6, 7}
I_{6, 7}
−(B − Y) signal (peak-to-peak value)
internal bias during clamping
DC input current between clamping
pulses
75% colour bar signal −
−
−
1.33 −
V
4.0 −
V
−
0.1 µA
I_{6, 7}
V_7(p-p)
R_{6, 7}
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 −
−
MΩ
Y input (pin 8; capacitively coupled to a low-ohmic source; recommendation: maximum 600 Ω)
V_8(p-p)
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
R₈
AC input resistance
10.0 −
−
MΩ
V₈
internal bias during clamping
YHI = 0
−
3.7 −
V
YHI = 1
−
4.6 −
V
I₈
DC input current between clamping
pulses
−
−
0.1 µA
I_{8(max)(clamp)}
maximum input current during clamping
100 180 260 µA
RGB input 1 (R₁: pin 10, G₁: pin 11, B₁: pin 12; capacitively coupled to a low-ohmic source;
recommendation: maximum 600 Ω); note 1
V_{10, 11, 12(p-p)}
R_{10, 11, 12}
V_{10, 11, 12}
I_{10, 11, 12}
I_{10, 11, 12(clamp)}
input signal (peak-to-peak value)
AC input resistance
internal bias during clamping
DC input current between clamping
pulses
maximum input current during clamping
−
0.7 −
V
10.0 −
−
MΩ
−
5.1 −
V
−
−
0.1 µA
100 180 260 µA
1997 Feb 06
18