TDA4680 Datasheet, PDF (13/28 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
TDA4680
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Fast signal switch FSW₁ (pin 13) to select Y, CD or R₁, G₁, B₁ inputs (control bits: see Table 3)
V₁₃
voltage to select Y and CD
voltage range to select R₁, G₁, B₁
R₁₃
internal resistance to ground
∆t
difference between transit times for
signal switching and signal insertion
−
−
0.9 −
−
4.0
−
−
0.4
V
5.0
V
−
kΩ
10
ns
Fast signal switch FSW₂ (pin 1) to select Y, CD/R₁, G₁, B₁ or R₂, G₂, B₂ inputs (control bits: see Table 3)
V₁
voltage to select Y, CD/R₁, G₁, B₁
voltage to select R₂, G₂, B₂
R₁
internal resistance to ground
∆t
difference between transit times for
signal switching and signal insertion
−
−
0.9 −
−
4.0
−
−
0.4
V
5.0
V
−
kΩ
10
ns
Saturation adjust [acts on internal RGB signals under I²C-bus control; sub-address 01H (bit resolution 1.5%
of maximum saturation); data byte 3FH for maximum saturation, data byte 23H for nominal saturation and
data byte 00H for minimum saturation]
d_s
saturation below maximum
at 23H
−
5
−
dB
at 00H; f = 100 kHz
−
50
−
dB
Contrast adjust [acts on internal RGB signals under I²C-bus control; sub-address 02H (bit resolution 1.5% of
maximum contrast); data byte 3FH for maximum contrast, data byte 2CH for nominal contrast and data byte
00H for minimum contrast]
d_c
contrast below maximum
at 2CH
at 00H
−
3
−
dB
−
22
−
dB
Brightness adjust [acts on internal RGB signals under I²C-bus control; sub-address 00H (bit resolution 1.5%
of brightness range); data byte 3FH for maximum brightness, data byte 27H for nominal brightness and data
byte 00H for minimum brightness]
d_br
black level shift of nominal signal
at 3FH
amplitude referred to cut-off
at 00H
measurement level
−
30
−
%
−
−50
−
%
White potentiometers [under I²C-bus control; sub-addresses 04H (red), 05H (green) and 06H (blue); data byte
3FH for maximum gain; data byte 22H for nominal gain and data byte 00H for minimum gain]; note 3
∆G_v
relative to nominal gain
increase of AC gain
at 3FH
−
60
−
%
decrease of AC gain
at 00H
−
60
−
%
1996 Oct 25
13