- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16742 > NCS2564DTBGEVB (ON Semiconductor)BOARD EVAL FOR NCS2564 VID DVR PDF資料下載
參數(shù)資料
| 型號(hào)： | NCS2564DTBGEVB |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 3/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR NCS2564 VID DVR |
| 設(shè)計(jì)資源： | NCS2564DTBGEVB Bill of Materials NCS2564DTBGEVB Gerber File NCS2564DTBGEVB Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 視頻，放大器，四路 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | NCS2564 |
| 主要屬性： | 增益 6dB，重構(gòu)濾波器 |
| 次要屬性： | AC 或 DC 耦合輸入和輸出 |
| 已供物品： | 板 |
| 其它名稱： | NCS2564DTBGEVBOS |
第1頁(yè)第2頁(yè)當(dāng)前第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)
NCS2564
http://onsemi.com
11
APPLICATIONS INFORMATION
The NCS2564 quad video driver has been optimized for
Standard and High Definition video applications covering
the requirements of the standards Composite video (CVBS),
SVideo, Component Video (480i/525i, 576i/625i,
720p/1080i) and related (RGB). The three SD/HD channels
have selectable filters (8 MHz and 34 MHz) for covering
either standard definitionlike video applications or High
Definition video applications. These frequencies are
selectable using the pin SD/HD.
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
NCS2564 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 22. ACCoupled Configuration at the Input and Output
0.1 mF
VCC
SD/HD
3
2
114
13
12
CVBS_IN
GND
CVBS_OUT
6
7
411
8
9
SD/HD_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/HD EN
CVBS EN
SD/HD SEL
75 W Cable
220 mF
75 W
CVBS
75 W Cable
0.1 mF
10 mF
+ 5 V
CVBS_EN
SD/HD IN1
SD/HD IN2
SD/HD IN3
SD/HD OUT1
SD/HD OUT2
SD/HD OUT3
Rs
0.1 mF
NCS2564
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 23).
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 NCS2564 can consequently be disabled when not used.
The NCS2564’s quiescent current reduces to 42
mA typical
during shutdown mode.
DCCoupled Output
The outputs of the NCS2564 can be DCcoupled to a
150
W load (Figure 23). 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VERSAFIT-3X-3/8-0-SP | HEAT SHRINK TUBING |
| H6MMS-2606M | DIP CABLE - HDM26S/AE26M/HDM26S |
| M1BXA-2436J | IDC CABLE - MSR24A/MC24G/X |
| EYM22DRMS | CONN EDGECARD 44POS .156 WW |
| H4PXH-1036G | DIP CABLE - HDP10H/AE10G/X |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCS2564DTBR2G | 功能描述:視頻放大器 4 CH VIDEO DRVR SLCT SD/HD RCON FLTR RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| NCS2566 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Six-Channel Video Driver with Triple SD & Triple Selectable SD/HD Filters |
| NCS2566DTBR2G | 功能描述:視頻放大器 6 CH VIDEO AMP TRIP SLCT SD/HD RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| NCS-256-Ad | 制造商:Nanaboshi Electric Mfg Co Ltd 功能描述:Bulk |
| NCS-256-AdF | 制造商:Nanaboshi Electric MFG 功能描述:6 25 A_v^ X[qitcj h n_ 250V 5A 2000M 3m 1800V/1min. +120 -40 / jbPbL Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。