参数资料
| 型号： | EL4501IUZ |
| 厂商： | Intersil |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO FRONT END AMP 24-QSOP |
| 标准包装： | 55 |
| 应用： | 视频前端（VFE） |
| 电路数： | 1 |
| -3db带宽： | 100MHz |
| 转换速率： | 96 V/µs |
| 电流 - 电源： | 10.5mA |
| 电流 - 输出 / 通道： | 70mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1233 (CN2011-ZH PDF) |
15
Block Diagram
Applications Information
Product Description
The EL4501 is a video front-end sub-system comprised of a
video amplifier with DC-restore, an adjustable threshold data
slicer, and an advanced sync separator. The prime function
of the system is to DC-stabilize and buffer AC-coupled
analog video signals and to extract timing reference signals
embedded in the video signal. An adjustable threshold data
slicer incorporated into the EL4501 may be used to extract
data embedded within the active video or VBI regions of a
video signal.
Theory of Operation
DC-RESTORE LOOP
When video signals are distributed, it is common to employ
capacitive coupling to prevent DC current flow due to
differences in local grounds or signal reference levels.
However, the coupling capacitor causes the DC level of the
signal post capacitor to be dependent on the video
(luminance) content of the waveform. A DC-restore loop is
used to correct this behavior by moving a portion of the
video waveform to a DC reference level in response to a
control signal. When the loop is operating, DC drift
accumulates over a single line only, before it is corrected.
The peak value of drift is limited by the rate of the control
signal (typically video line rate) and the AC coupling time
constant.
The restore loop is comprised of a 100MHz forward video
amplifier, combined with a nulling amplifier and sample and
hold circuit. For maximum flexibility the hold capacitor is
placed off-chip, allowing the loop response rate to be tailored
for specific applications and minimizing hold-step problems.
The loop provides a restore current peak of ±20A at room
temperature. Figure 36 shows the amplifier and S/H
connection. During normal operation the internally generated
DC-restore control signal is timed to the back porch of the
video waveform. Figure 37 shows an NTSC video signal,
along with the EL4501 BACK PORCH output. In operation,
BACK PORCH activates the S/H switch, completing the
nulling feedback loop and driving the video amplifier output
towards the reference voltage. At the end of BACK PORCH,
the external capacitor holds the correction voltage for the
remainder of the video line. In the absence of a valid input
signal, the chip generates a repetitive, arbitrary restore
control signal at the line rate set by the external resistor
RFREQ. Although uncorrelated to the input, the pulse
-
+
-
+
-
+
FILTER
+
-
SYNC
SEPARATOR
GND
GNDD
RFREQ
LOS
SYNC AMP
FSEL
SYNC IN
VIDEO IN
0.1F
INPUT
VIDEO
VS
VSD
DS REF
ODD/EVEN
VERTICAL
HORIZONTAL
COMPOSITE
BACK PORCH
REF OUT
REF IN
VFB
VIDEO OUT
DS OUT
DS ENABLE
DS MODE
CHOLD
CREF
RF
RG
1.3V
TRACK/
HOLD
SLICE
MODE
EL4501
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4501IUZT13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Front End |
| EL4501IUZ-T13 | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4501IUZ-T7 | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4501IUZ-T7A | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4502 | 功能描述:高速光耦合器 Optocouplers RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
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