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TDA4882 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. TDA4882
Description  Advanced monitor video controller for OSD
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 5 page
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1997 Sep 04
5
Philips Semiconductors
Product speciļ¬cation
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
GND
4
ground
VIN2
5
signal input channel 2
CC
6
contrast control, OSD switch
VP
7
supply voltage
VIN3
8
signal input channel 3
HBL
9
horizontal blanking, switch-off
CL
10
input clamping, vertical blanking,
test mode
GC3
11
gain control channel 3
FB3
12
feedback channel 3
VOUT3
13
voltage output channel 3
IOUT3
14
current output channel 3
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
IOUT1
20
current output channel 1
Fig.2 Pin configuration.
handbook, halfpage
BC
GND
CC
HBL
CL
VOUT1
IOUT1
FB1
VOUT2
IOUT2
FB2
VOUT3
VIN1
VIN2
VIN3
VP
IOUT3
FB3
GC3
GC1
1
2
3
4
5
6
7
8
9
10
11
12
20
19
18
17
16
15
14
13
TDA4882
MHA815
7
FUNCTIONAL DESCRIPTION
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.
7.2
Brightness control
Brightness control (Fig.4) yields a simultaneous signal
black-level shift of the three channels relative to a
reference black level.
For nominal brightness (pin 1 open-circuit) the signal black
level is equal to the reference black level.
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 VBE variation (Fig.8).




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