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| 型号： | MAX9503METE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO W/FILTER 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 系列： | DirectDrive® |
| 应用： | 滤波器 |
| 电路数： | 1 |
| 电流 - 电源： | 12mA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 包装： | 管件 |
The MAX9503 has an integrated charge pump and linear
regulator to create a low-noise negative supply from the
positive supply voltage. The charge pump inverts the
positive supply to create a raw negative voltage that is
then fed into the linear regulator, which outputs -2V. The
linear regulator filters out the charge-pump noise.
Comparison Between DirectDrive Output
vs. AC-Coupled Output
The actual level of the video signal varies less with a
DirectDrive output than an AC-coupled output. The
video signal average can change greatly depending
upon the picture content. With an AC-coupled output,
the average will change according to the time constant
formed by the series capacitor and series resistance
(usually 150
Ω). For example, Figure 1 shows an AC-
coupled video signal alternating between a completely
black screen and a completely white screen. Notice the
excursion of the video signal as the screen changes.
With the DirectDrive amplifier, the black level is held at
ground. The video signal is constrained between
-0.3V to +0.7V. Figure 2 shows the video signal from a
DirectDrive amplifier with the same input signal as the
AC-coupled system.
Video Reconstruction Filter
Before the video signal from the DAC can be amplified,
it must be lowpass filtered to smooth the steps and to
reduce the spikes created whenever the DAC output
changes value. In the frequency domain, the steps and
spikes cause images of the video signal to appear at
multiples of the sampling clock. The MAX9503 contains
a six-pole Butterworth lowpass filter. The passband
extends to 5.5MHz, and the minimum attenuation is
35dB at 27MHz.
Short-Circuit Protection
The MAX9503 typical application circuit includes a 75
Ω
back-termination resistor that limits short-circuit current if
an external short is applied to the video output. The
MAX9503 features internal output, short-circuit protection
to prevent device damage in prototyping and applica-
tions where the amplifier output can be directly shorted.
Shutdown
The MAX9503 features a low-power shutdown mode for
battery-powered/portable applications. Shutdown
reduces the quiescent current to less than 10nA.
Connecting SHDN to ground (SGND) disables the out-
puts and places the MAX9503 into a low-power shut-
down mode. In shutdown mode, the amplifier, charge
pump, and linear regulator are turned off and the video
output impedance is 4k
Ω.
MAX9503
DirectDrive Video Amplifier with
Reconstruction Filter
_______________________________________________________________________________________
9
INPUT
500mV/div
OUTPUT
500mV/div
2ms/div
Figure 1. AC-Coupled Output
INPUT
500mV/div
OUTPUT
1V/div
2ms/div
0V
Figure 2. DirectDrive Output
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9503METE+ | 功能描述:视频放大器 DirectDrive Video Amplifier RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX9503METE+T | 功能描述:视频放大器 DirectDrive Video Amplifier RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX9503METE-T | 功能描述:视频放大器 RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX9504AELT | 制造商:Maxim Integrated Products 功能描述:3V/5V 6DB VIDEO AMPLIFIERS WITH HI - Rail/Tube |
| MAX9504AELT+ | 制造商:Maxim Integrated Products 功能描述:VID AMP SGL 5.5V 6PIN UDFN - Rail/Tube |
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