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| 型号： | MAX7461EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC ALARM LOSS-OF-SYNC SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 同步损耗报警 |
| 应用： | 安全系统 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | MAX7461EUK+TDKR |
Detailed Description
The MAX7461 single-channel LOS alarm is ideal for any
video system needing to verify the presence of a video
source. The device accepts an AC-coupled CVBS, Y,
or any video signal with sync, and pulls LOS low when
no composite sync signal is detected for more than the
LOS detect time (3.4ms, typ) at the input (IN).
Clamp
The MAX7461 features an input clamp that corrects any
DC shift, on a line-by-line basis. The external AC-cou-
pling capacitor provides DC isolation for the input.
Lowpass Filter
The MAX7461 integrates a lowpass filter for enhanced
sync detection. The lowpass filter prevents false sync
detection by reducing color burst, chroma, and noise.
Sync Detector/LOS Filter
The sync detector looks for sync pulses greater than
the minimum sync voltage (0.13VP-P). If the detector
does not detect any sync pulses for 3.4ms (typ), the
LOS filter pulls LOS low. After detecting sync for at
least 2.2ms (typ), the LOS filter returns LOS to a high-
impedance state. LOS is an open-drain output.
Connect a 1k
Ω pullup resistor between LOS and VCC.
Power-On Reset (POR)
At power-up, LOS is pulled low and the MAX7461
checks for 2.2ms (typ) of valid sync pulses before
releasing LOS. LOS remains high impedance while a
valid sync signal is detected at the input.
Applications Information
Input Considerations
Use 0.1F ceramic capacitors to AC-couple the input.
The input cannot be DC-coupled. The input capacitor
stores a DC level so that the video signal is clamped to
an appropriate DC voltage for proper sync detection.
Power-Supply Bypassing
Careful PC board layout is important for optimal system
performance. Do not use wire-wrapped boards or
breadboards. When possible, use a multilayer board
with a dedicated low-inductance ground plane and
supply plane. Connect all GND inputs to a single
ground plane and VCC to a single-supply plane.
Bypass VCC to GND with a 0.1F capacitor.
Wired-OR Application
The LOS open-drain output allows the MAX7461 to be
used in wired-OR applications as shown in the typical
application diagram of Figure 1.
Chip Information
PROCESS: BiCMOS
Loss-of-Sync Alarm
4
Maxim Integrated
MAX7461
Pin Description
PIN
NAME
FUNCTION
1IN
Video Input. Accepts CVBS, luma (Y), or any video input with sync. AC-couple IN with a series 0.1F
capacitor.
2, 3
GND
Ground
4
LOS
Loss-Of-Sync Output (Open Drain). LOS is in high impedance when sync pulses are detected, and is
pulled low when no horizontal sync signal is detected for more than the LOS detect time. LOS returns
high when sync pulses are detected for more than the LOS release time. Connect a 1k
Ω pullup resistor
from LOS to VCC.
5VCC
Power-Supply Input. Bypass to GND with a 0.1F capacitor.
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| MAX7462USA | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7462USA+ | 功能描述:有源滤波器 Video Reconstruction Filtr RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7462USA+T | 功能描述:视频 IC Video Reconstruction Filtr 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 |
| MAX7462USA-T | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7462UUA | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
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