參數(shù)資料
型號： TDA4882
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： Advanced monitor video controller for OSD
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP20
封裝： 0.300 INCH, PLASTIC, SOT-146-1, DIP-20
文件頁數(shù)： 5/28頁
文件大小： 263K
代理商： TDA4882
1997 Sep 04
5
Philips Semiconductors
Product specification
Advanced monitor video controller for OSD
TDA4882
6
PINNING
SYMBOL
PIN
DESCRIPTION
BC
VIN1
GC1
GND
VIN2
CC
V
P
VIN3
HBL
CL
1
2
3
4
5
6
7
8
9
10
brightness control
signal input channel 1
gain control channel 1
ground
signal input channel 2
contrast control, OSD switch
supply voltage
signal input channel 3
horizontal blanking, switch-off
input clamping, vertical blanking,
test mode
gain control channel 3
feedback channel 3
voltage output channel 3
current output channel 3
feedback channel 2
voltage output channel 2
current output channel 2
feedback channel 1
voltage output channel 1
current output channel 1
GC3
FB3
VOUT3
IOUT3
FB2
VOUT2
IOUT2
FB1
VOUT1
IOUT1
11
12
13
14
15
16
17
18
19
20
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 V
BE
variation (Fig.8).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA4883 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Non-VGA Video Controller
TDA4884 制造商:NXP Semiconductors 功能描述:3 CHANNEL, VIDEO PREAMPLIFIER, PDIP20
TDA4885 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
TDA4885/V2 制造商:NXP Semiconductors 功能描述:
TDA4886 制造商:PHILIPS-SEMI 功能描述:
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