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參數(shù)資料
| 型號： | MAX9586 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single, Dual, Triple, and Quad Standard-Definition Video Filter Amplifiers with AC-Coupled Input Buffers |
| 中文描述： | 單、雙、三和四通道標清視頻濾波放大器，提供交流耦合輸入緩沖器 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 426K |
| 代理商： | MAX9586 |
M
Single, Dual, Triple, and Quad Standard-Definition
Video Filter Amplifiers with AC-Coupled Input Buffers
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9
Detailed Description
The MAX9586–MAX9589 filter and amplify the video
DAC output in applications such as set-top boxes and
televisions. These devices consist of input clamps,
input bias circuits, lowpass filters, and gain of 2V/V out-
put amplifiers capable of driving a standard 150
video load to ground.
Inputs
The input stages of the MAX9586–MAX9589 are either
sync-tip clamps or bias circuits. Sync-tip clamps accept
AC-coupled CVBS or luma video signals with sync puls-
es. The sync-tip voltage is internally set to 300mV. Bias
circuit inputs accept AC-coupled chroma, a subcarrier
modulated with the color information. The bias voltage
of the bias circuits is approximately 500mV.
Video Filter
The filter passband (±1dB) is typically 7MHz, which
makes the device suitable for standard-definition video
signals from all sources (e.g., broadcast and DVD).
Broadcast video signals are channel limited: NTSC sig-
nals have 4.2MHz bandwidth and PAL signals have
5MHz bandwidth. Video signals from a DVD player,
however, are not channel limited, so the bandwidth of
DVD video signals can approach the Nyquist limit of
6.75MHz. (Recommendation ITU-R BT.601-5 specifies
13.5MHz as the sampling rate for standard-definition
video). Therefore, the maximum bandwidth of the signal
is 6.75MHz. To ease the filtering requirements, most
modern video systems oversample by two times, clock-
ing the video current DAC at 27MHz.
Outputs
The video output amplifiers can both source and sink
load current, allowing output loads to be DC- or AC-
coupled. The amplifier output stage needs approxi-
mately 300mV of headroom from either supply rail. The
devices have an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output.
If the supply voltage is greater than 3.135V (5% below
a 3.3V supply), each amplifier can drive two DC-cou-
pled video loads to ground. If the supply is less than
3.135V, each amplifier can drive only one DC-coupled
or AC-coupled video load.
Shutdown (MAX9586)
The MAX9586 draws less than 1μA supply current
when
SHDN
is low. In shutdown mode, the amplifier
output becomes high impedance.
Applications Information
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 1.
Coupling capacitors should be 220μF or greater to
keep the highpass filter, formed by the 150
equivalent
resistance of the video transmission line, to a corner
frequency of 4.8Hz or below. The frame rate of PAL
systems is 25Hz, and the frame rate of NTSC systems
is 30Hz. The corner frequency should be well below the
frame rate.
Power-Supply Bypassing and Ground
The MAX9586–MAX9589 operate from a single-supply
voltage down to 2.7V, allowing for low-power operation.
Bypass V
DD
to GND with a 0.1μF capacitor. Place all
external components as close as possible to the device.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9586AZK+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX9586AZK+T | 功能描述:視頻放大器 Standard-Definition 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 |
| MAX9586EVKIT+ | 功能描述:視頻放大器 MAX9586 Evaluation Kit 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 |
| MAX9587AZT+ | 制造商:Maxim Integrated Products 功能描述:SINGLE, DUAL, TRIPLE, AND QUAD STANDARD-DEFINITION VIDEO FIL - Rail/Tube |
| MAX9587AZT+T | 功能描述:視頻放大器 Standard-Definition 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 |
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