tda4882, Ham- CB Radio, Karty katalogowe
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INTEGRATED CIRCUITS
DATA SHEET
TDA4882
Advanced monitor video controller
for OSD
Product specification
Supersedes data of December 1994
File under Integrated Circuits, IC02
1997 Sep 04
Philips Semiconductors
Product specification
Advanced monitor video controller for OSD
TDA4882
CONTENTS
1
FEATURES
2
GENERAL DESCRIPTION
3
QUICK REFERENCE DATA
4
ORDERING INFORMATION
5
BLOCK DIAGRAM
6
PINNING
7
FUNCTIONAL DESCRIPTION
7.1
General
7.2
Brightness control
7.3
Contrast control
7.4
Output stages
7.5
Input clamping
7.6
Vertical blanking
7.7
Horizontal blanking
7.8
Cut-off and black-level stabilization
7.9
On Screen Display
7.10
Test mode
8
LIMITING VALUES
9
THERMAL CHARACTERISTICS
10
CHARACTERISTICS
11
APPLICATION AND TEST INFORMATION
11.1
Recommendations for building the application
board
12
INTERNAL PIN CONFIGURATION
13
PACKAGE OUTLINE
14
SOLDERING
14.1
Introduction
14.2
Soldering by dipping or by wave
14.3
Repairing soldered joints
15
DEFINITIONS
16
LIFE SUPPORT APPLICATIONS
1997 Sep 04
2
Philips Semiconductors
Product specification
Advanced monitor video controller for OSD
TDA4882
1 FEATURES
2 GENERAL DESCRIPTION
·
85 MHz video controller
The TDA4882 is an RGB pre-amplifier for colour monitor
systems with SVGA performance, intended for DC or AC
coupling of the colour signals to the cathodes of the CRT.
·
Fully DC controllable
·
3 separate video channels
With special advantages the circuit can be used in
conjunction with the TDA485x monitor deflection IC family.
·
Input black-level clamping
·
White level adjustment for 2 channels only
·
Brightness control with correct grey scale tracking
·
Contrast control for all 3 channels simultaneously
·
Cathode feedback to internal reference for cut-off
control, which allows unstabilized video supply voltage
·
Current outputs for RGB signal currents
·
RGB voltage outputs to external peaking circuits
·
Blanking and switch-off input for screen protection
·
Sync on green operation possible
·
On Screen Display (OSD) facility.
3 QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
V
P
positive supply voltage
7.2
8.0
8.8
V
I
P
supply current
36
48
60
mA
V
i(b-w)
input voltage, black-to-white
-
0.7
1.0
V
V
o(b-w)
output voltage, black-to-white
nominal contrast;
channels 1 and 3 gain
control pins open-circuit
-
0.79
-
V
I
o(b-w)
output current, black-to-white
-
50
-
mA
I
OM
peak output current
-
-
100
mA
B
bandwidth
-
3dB
70
85
-
MHz
G
nom
nominal voltage gain
nominal contrast;
channels 1 and 3 gain
control pins open-circuit
-
1
-
dB
D
G
gain control difference for 2 channels
relative to G
nom
-
5
-
+2.6
dB
CR
contrast
contrast control
V
i(CC)
=1to6V
-
22
-
+3.4
dB
C
OSD(min)
minimum contrast for OSD
V
i(CC)
= 0.7 V
-
-
40
-
dB
D
V
bl
brightness control related to nominal
output signal amplitude
-
11
-
+34
%
T
amb
operating ambient temperature
-
20
-
+70
°
C
4 ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4882
DIP20
plastic dual in-line package; 20 leads (300 mil)
SOT146-1
1997 Sep 04
3
Philips Semiconductors
Product specification
Advanced monitor video controller for OSD
TDA4882
5 BLOCK DIAGRAM
handbook, full pagewidth
V
P
= 8 V
6.2 V
V
P
1
VOLTAGE
CONVERTER
10 k
W
brightness
control
TDA4882
current
output
1.5 k
W
V
CRT
= 90 V
signal
input
20
22 nF
2
CLAMP
CLIPPING
BAV21
75
W
10 M
W
voltage
output
19
220
W
33
W
33
W
BFQ235
V
P
68 k
W
8 V
10 k
W
3
VOLTAGE
CONVERTER
18
feedback
10 k
W
gain
control
CHANNEL 1
15 k
W
cut-off
control
6.8 k
W
4
1.5 k
W
V
CRT
= 90 V
current
output
25 MHz
signal
input
17
BFQ236
22 nF
BAV21
5
CLAMP
CLIPPING
75
W
10 M
W
10
W
220
W
40 MHz
voltage
output
1 k
W
CRT
16
BFQ235
10
W
68 k
W
8 V
33
W
33
W
REF
GAIN
10 k
W
15 k
W
60 MHz
cut-off
c
ontrol
BFQ256
6.8 k
W
V
P
CHANNEL 2
15
feedback
6
VOLTAGE
CONVERTER
10 k
W
contrast
control
V
P
7
+
860
W
V
CRT
= 65 V
signal
input
14
current
output
BFQ236
22 nF
8
CLAMP
CLIPPING
BAV21
10
W
75
W
10 M
W
voltage
output
BFQ235
1 k
W
47 nF
1
00
W
13
18
W
18
W
10
W
V
CRT
9
VOLTAGE
CONVERTER
BFQ256
93
k
10 k
W
horizontal blanking
switch off
CHANNEL 3
12
feedback
cut-off
control
input
clamping
test mode
ultra black
10 k
W
blanking
output clamping
10
PULSE
DECODER
5.8 V
V
P
horizontal blanking
MED910
clamping pulse
vertical blanking
test mode
11
10 k
W
gain
control
Fig.1 Block diagram and basic application circuits for DC and AC coupling.
1997 Sep 04
4
W
Philips Semiconductors
Product specification
Advanced monitor video controller for OSD
TDA4882
6 PINNING
SYMBOL PIN
DESCRIPTION
BC
1
brightness control
VIN1
2
signal input channel 1
GC1
3
gain control channel 1
handbook, halfpage
GND
4
ground
BC
1
20
IOUT1
VIN2
5
signal input channel 2
VIN1
2
19
VOUT1
CC
6
contrast control, OSD switch
GC1
3
18
FB1
V
P
7
supply voltage
GND
4
17
IOUT2
VIN3
8
signal input channel 3
VIN2
5
16
VOUT2
HBL
9
horizontal blanking, switch-off
TDA4882
CC
6
15
FB2
CL
10 input clamping, vertical blanking,
test mode
V
P
7
14
IOUT3
GC3
11 gain control channel 3
VIN3
8
13
VOUT3
FB3
12 feedback channel 3
HBL
9
12
FB3
VOUT3
13 voltage output channel 3
CL
10
11
GC3
IOUT3
14 current output channel 3
MHA815
FB2
15 feedback channel 2
VOUT2
16 voltage output channel 2
IOUT2
17 current output channel 2
FB1
18 feedback channel 1
VOUT1
19 voltage output channel 1
Fig.2 Pin configuration.
IOUT1
20 current output channel 1
7 FUNCTIONAL DESCRIPTION
For nominal brightness (pin 1 open-circuit) the signal black
level is equal to the reference black level.
7.1
General
Figure 4 illustrates the signal processing. The RGB input
signals 0.7 V (p-p) are capacitively coupled into the
TDA4882 from a low ohmic source and are clamped to an
internal DC voltage (artificial black level). Composite
signals will not disturb normal operations because an
internal clipping circuit cuts all signal parts below black
level. Channels 1 and 3 have a maximum total voltage
gain of 7 dB (maximum contrast and maximum individual
channel gain), channel 2 having 4.4 dB (maximum
contrast and nominal gain). With the nominal channel gain
of 1 dB and nominal contrast setting the nominal
black-to-white output signal is 0.79 V (p-p). Brightness,
contrast and gain control is by DC voltage.
7.3
Contrast control
Contrast is voltage controlled to affect the three channels
simultaneously (Fig.4). To provide the correct white point,
individual gain controls adjust the signals of channels 1
and 3 relative to the reference channel 2. Gain setting also
changes contrast to achieve correct grey scale tracking.
7.4 Output stages
The output stages provide both voltage and current
outputs. External cascode transistors reduce power
consumption of the IC and prevent breakdown of the
output transistors. Signal output currents and peaking
characteristics are determined by external components at
the voltage outputs and the video supply. The channels
have separate internal feedback loops which ensure large
signal linearity and marginal signal distortion irrespective
of output transistor thermal V
BE
variation (Fig.8).
7.2
Brightness control
Brightness control (Fig.4) yields a simultaneous signal
black-level shift of the three channels relative to a
reference black level.
1997 Sep 04
5
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