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TDA4687 Datasheet, PDF (12/24 Pages) NXP Semiconductors – Video processor with automatic cut-off control | |||
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Philips Semiconductors
Video processor with automatic cut-off control
Product speciï¬cation
TDA4687
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 2)
V13
voltage to select Y and CD
voltage to select R1, G1, B1
R13
internal resistance to ground
ât
difference between transit times for
signal switching and signal insertion
â
â
0.9
â
â
4.0
â
â
0.4
V
5.0
V
â
kâ¦
10
ns
Fast signal switch FSW2 (pin 1) to select Y, CD/R1, G1, B1 or R2, G2, B2 inputs (control bits: see Table 2)
V1
voltage to select Y, CD/R1, G1, B1
voltage to select R2, G2, B2
R1
internal resistance to ground
ât
difference between transit times for
signal switching and signal insertion
â
â
0.9
â
â
4.0
â
â
0.4
V
5.0
V
â
kâ¦
10
ns
Saturation adjust [acts on â(R â Y) and â(B â Y) signals under I2C-bus control; subaddress 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]
ds
saturation below maximum
at 23H
â
5
â
dB
at 00H; f = 100 kHz
â
50
â
dB
Contrast adjust [acts on internal RGB signals under I2C-bus control; subaddress 02H (bit resolution 1.5% of
maximum contrast); data byte 3FH for maximum contrast, data byte 22H for nominal contrast and data byte
00H for minimum contrast]
dc
contrast below maximum
at 22H
at 00H
â
5
â
dB
â
22
â
dB
Brightness adjust [acts on internal RGB signals under I2C-bus control; subaddress 00H (bit resolution 1.5%
of maximum brightness); data byte 3FH for maximum brightness, data byte 26H for nominal brightness and
data byte 00H for minimum brightness]
dbr
black level shift of nominal signal
at 3FH
amplitude referred to cut-off
at 00H
measurement level
â
30
â
%
â
â50
â
%
White potentiometers [under I2C-bus control; subaddresses 04H (red), 05H (green) and 06H (blue); data byte
3FH for maximum gain; data byte 19H for nominal gain and data byte 00H for minimum gain]; note 3
âGv
relative to nominal gain
increase of gain
at 3FH
â
50
â
%
decrease of gain
at 00H
â
50
â
%
1997 Jun 23
12
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