TDA4681 Datasheet, PDF (15/28 Pages) NXP Semiconductors – Video processor with automatic cut-off and white level control

Philips Semiconductors
Video processor with automatic cut-off
and white level control
Product specification
TDA4681
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
GENERAL
I₁₄
input current
V₁₄ < 0.5 V
−100 −
t_d
leading edge delay of the clamping control bit DELOF = 0 −
1.5
pulse
control bit DELOF = 1 −
0
t_BK
n_pulse
required burst key pulse time
control bit DELOF = 0; 3
−
normally used with f_L
control bit DELOF = 1; 1.5
−
normally used with 2f_L
required horizontal or burst key pulses e.g. at interlace scan 4
−
during vertical blanking interval
(VBW2 = 0)
e.g. at progressive line 8
−
scan (VBW2 = 1)
−
µA
−
µs
−
µs
−
µs
−
µs
29
−
57
−
Average beam current limiting (pin 15); note 7
V_c(15)
∆V_c(15)
contrast reduction starting voltage
voltage difference for full contrast
reduction
V_br(15)
∆V_br(15)
brightness reduction starting voltage
voltage difference for full brightness
reduction
−
4.0
−
V
−
−2.0
−
V
−
2.5
−
V
−
−1.6
−
V
Peak drive limiting voltage [pin 16; internal peak drive limiting level (V_pdl) acts on RGB outputs under I²C-bus
control; subaddress 0AH]; note 8
V_20,22,24
RGB output voltages
at 00H
at 3FH
−
−
6.5
−
3.0
V
−
V
I₁₆
charge current
discharge current
−
−1
−
µA
during peak white
−
5
−
mA
V₁₆
V_c(16)
∆V_c(16)
internal voltage limitation
contrast reduction starting voltage
voltage difference for full contrast
reduction
4.5
−
−
V
−
4.0
−
V
−
−2.0
−
V
V_br(16)
∆V_br(16)
brightness reduction starting voltage
voltage difference for full brightness
reduction
−
2.5
−
V
−
−1.6
−
V
1997 Mar 04
15