參數(shù)資料
型號(hào)： MAX9507
廠商： Maxim Integrated Products, Inc.
英文描述： 1.8V DirectDrive Video Filter Amplifier with Load Detection and Dual SPST Analog Switches
中文描述： 1.8V、DirectDrive視頻濾波放大器，提供負(fù)載檢測(cè)和兩路SPST模擬開(kāi)關(guān)
文件頁(yè)數(shù)： 13/29頁(yè)
文件大小： 480K
代理商： MAX9507
The series capacitor creates a highpass filter. Since the
lowest frequency in video is the frame rate, which can be
between 24Hz and 30Hz, the pole of the highpass filter
should ideally be an order of magnitude lower in fre-
quency than the frame rate. Therefore, the series capaci-
tor must be very large, typically from 220μF to 3000μF.
For space-constrained equipment, the series capacitor
is unacceptable. Changing from a single series capaci-
tor to a SAG network that requires two smaller capacitors
can only reduce space and cost slightly.
The series capacitor in the usual output connection
also prevents damage to the output amplifier if the con-
nector is shorted to a supply or to ground. While the
output connection of the MAX9507 does not have a
series capacitor, the MAX9507 will not be damaged if
the connector is shorted to a supply or to ground (see
the Short-Circuit Protection section).
Video Amplifier
If the full-scale video signal from a video DAC is
250mV, the black level of the video signal created by
the video DAC is around 75mV. The MAX9507 shifts the
black level to near ground at the output so that the
active video is above ground and the sync is below
ground. The amplifier needs a negative supply for its
output stage to remain in its linear region when driving
sync below ground.
The MAX9507 has an integrated charge pump and lin-
ear 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 volt-
age that is then fed into the linear regulator filtering out
the charge-pump noise.
Comparison Between DirectDrive Output
and AC-Coupled Output
The actual level of the video signal varies less with a
DirectDrive output than an AC-coupled output. The
average video signal level can change greatly depend-
ing upon the picture content. With an AC-coupled out-
put, the average level will change according to the time
constant formed by the series capacitor and series
resistance (usually 150
Ω
). For example, Figure 4 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 5 shows the video signal from a
DirectDrive amplifier with the same input signal as the
AC-coupled system.
Video Reconstruction Filter
The MAX9507 includes an internal five-pole,
Butterworth lowpass filter to condition the video signal.
The reconstruction filter smoothes the steps and
reduces 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 frequency. The recon-
struction filter typically has ±1dB passband flatness of
7.3MHz and 48dB attenuation at 27MHz.
M
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
______________________________________________________________________________________
13
INPUT
OUTPUT
2ms/div
INPUT
OUTPUT
2ms/div
0V
0V
Figure 4. AC-Coupled Output
Figure 5. DirectDrive Output
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9507ATE+ 功能描述:視頻放大器 1.8V DirectDrive Video Filter Amp 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
MAX9507ATE+T 功能描述:視頻放大器 1.8V DirectDrive Video Filter Amp 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
MAX9507EVCMAXQU+ 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX9507 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
MAX9507EVKIT 功能描述:視頻放大器 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
MAX9507EVKIT+ 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX9507 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
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