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參數(shù)資料
| 型號： | NCS2554DTBR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP SD VIDEO 4CH 14TSSOP |
| 產(chǎn)品變化通告： | Product Discontinuation 30/Sept/2011 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 應(yīng)用： | 重構(gòu)濾波器 |
| 電路數(shù)： | 4 |
| -3db帶寬： | 8MHz |
| 電流 - 電源： | 40mA |
| 電流 - 輸出 / 通道： | 40mA |
| 電壓 - 電源，單路/雙路(±)： | 4.7 V ~ 5.3 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
NCS2554
http://onsemi.com
8
APPLICATIONS INFORMATION
The NCS2554 quad video driver has been optimized for
Standard video applications covering the requirements of
the standards Composite video (Cvbs), SVideo,
Component Video (480i/525i, 576i/625i) and related
(RGB). The three SD channels have 8 MHz filters for
covering standard definitionlike video applications.
In the regular mode of operation each channel provides an
internal voltagetovoltage gain of 2 from input to output.
This effectively reduces the number of external components
required as compared to discrete approached implemented
with stand alone op amps. An internal level shifter is
employed shifting up the output voltage by adding an offset
of 200 mV. This prevents sync pulse clipping and allows
DCcoupled output to the 150
W video load. In addition, the
NCS2554 integrates a 6th order Butterworth filter for each.
This allows rejection of the aliases or unwanted
over-sampling effects produced by the video DAC.
Similarly for the case of DVD recorders which use an ADC,
this antialiasing filter (reconstruction filter) will avoid
picture quality issue and will aide filtration of parasitic
signals caused by EMI interference.
Figure 14. ACCoupled Configuration at the Input and Output
0.1 mF
VCC
NC
3
2
1
14
13
12
CVBS_IN
GND
CVBS_OUT
6
7
4
11
8
9
SD_EN
5
10
TV
220 mF
75 W
220 mF
75 W
Rs
V
ideo
Processor
Y / G
Pb / B
Pr / R
CVBS
Y / G
Pb / B
Pr / R
SD_EN
CVBS EN
75 W Cable
220 mF
75 W
CVBS
75 W Cable
0.1 mF
10 mF
+ 5 V
CVBS_EN
SD_IN1
SD_IN2
SD_IN3
SD_OUT1
SD_OUT2
SD_OUT3
Rs
0.1 mF
NCS2554
A builtin diodelike clamp is used into the chip for each
channel to support the ACcoupled mode of operation. The
clamp is active when the input signal goes below 0 V.
The builtin clamp and level shifter allow the device to
operate in different configuration modes depending on the
DAC output signal level and the input common mode
voltage of the video driver. When the configuration is
DCCoupled at the Inputs and Outputs the 0.1
mF and
220
mF coupling capacitors are no longer used, and the
clamps are in that case inactive; this configuration provides
a low cost solution which can be implemented with few
external components (Figure 15).
The input is ACcoupled when either the inputsignal
amplitude goes over the range 0 V to 1.4 V or the video
source requires such a coupling. In some circumstances it
may be necessary to autobias signals with the addition of
a pullup and pulldown resistors or only pullup resistor
(Typical 7.5 M
W combined with the internal 800 kW
pulldown) making the clamp inactive.
The output ACcoupling configuration is advantageous
for eliminating DC ground loop with the drawback of
making the device more sensitive to video line or field tilt
issues in the case of a too low output coupling capacitor. In
some cases it may be necessary to increase the nominal
220
mF capacitor value.
Shutdown Mode
If the enable pins are left open by default the circuit will
be enabled. The Enable pin offers a shutdown function, so
the NCS2554 can consequently be disabled when not used.
The NCS2554’s quiescent current reduces to 42
mA typical
during shutdown mode.
DCCoupled Output
The outputs of the NCS2554 can be DCcoupled to a
150
W load (Figure 15). This has the advantage of
eliminating the ACcoupling capacitors at the output by
reducing the number of external components and saving
space on the board. This can be a key advantage for some
applications with limited space.
The problems of field tilt effects on the video signal are
also eliminated providing the best video quality with
optimal dynamic or peaktopeak amplitude of the video
signal allowing operating thanks to the builtin level shifter
without risk of signal clipping. In this coupling
configuration the average output voltage is higher than 0 V
and the power consumption can be a little higher than with
an ACcoupled configuration.
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| NCS-255-Ad | 制造商:Nanaboshi Electric MFG 功能描述:5 25 A_v^ IX[qicj h n_ 250V 10A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
| NCS-255-AdF | 制造商:Nanaboshi Electric MFG 功能描述:5 25 A_v^ X[qitcj h n_ 250V 10A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
| NCS-255-P | 制造商:Nanaboshi Electric MFG 功能描述:5 25 vO X[qicj h n_ 250V 10A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
| NCS-255-PM | 制造商:Nanaboshi Electric MFG 功能描述:5 25 vO IX[qitcj h n_ 250V 10A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
| NCS-255-R | 制造商:Nanaboshi Electric MFG 功能描述:5 25 Zv^N IX[qicj h n_ 250V 10A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
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