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參數(shù)資料
| 型號： | MAX9517ATC+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 22/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC STD-DEF VID FILT AMP12TQFN-EP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 視頻濾波器 |
| 應用： | 照相機，手機、媒體播放器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-TQFN 裸露焊盤 |
| 供應商設備封裝： | 12-TQFN EP（3x3） |
| 包裝： | 帶卷 (TR) |
MAX9517/MAX9524
Standard-Definition Video Filter Amplifiers with
Dual SPST Switches
_______________________________________________________________________________________
9
Detailed Description
The MAX9517/MAX9524 consist of a lowpass filter and
an output amplifier capable of driving a standard 150Ω
video load to ground. The MAX9517 has an input buffer
and the MAX9524 has an input sync-tip clamp. The
MAX9517/MAX9524 both have two SPST analog
switches that can be used to route audio, video, or digi-
tal signals. The output amplifiers provide a fixed gain of
2V/V.
The MAX9517/MAX9524 filter and amplify the video
DAC output. External video signals, in which the DC
bias is usually not known, can be AC-coupled to the
MAX9524.
Input with DC Buffer (MAX9517)
The input of the MAX9517 can be directly connected to
the video source if the signal is approximately between
ground and 1V. This specification is commonly found at
the output of most video DACs.
DC-coupling requires that the input signals are ground
referenced so that the sync tip of composite or luma
signals is within 50mV of ground.
Input with Sync-Tip Clamp (MAX9524)
When the bias of the incoming video signal is either
unknown or not between ground and 1V (such as an
external video source), use the MAX9524 to connect
the video source through a 0.1F capacitor.
The VIDIN input of the MAX9524 can only handle sig-
nals with a sync pulse, such as composite video and
luma. An internal sync-tip clamp sets the internal DC
level of the video signal.
Video Filter
The filter passband (±1dB) is typically 9MHz to make
the device suitable for standard-definition video signals
from all sources (including broadcast video 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; therefore, the band-
width 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 require-
ments, most modern video systems oversample by two
times, clocking 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 around
300mV of headroom from either supply rail. The parts
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
The MAX9517/MAX9524 draw less than 1A supply
current when
SHDN is low. In shutdown, the amplifier
output becomes high impedance.
Applications Information
Reducing Power Consumption
in the Video DACs
The MAX9517/MAX9524 have high-impedance input
buffers that can work with source resistances as high
as 300Ω. To reduce power dissipation in the video
DACs, the DAC output resistor can be scaled up in
value. The reference resistor that sets the reference
current inside the video DACs must also be similarly
scaled up. For instance, if the output resistor is 37.5Ω,
the DAC must source 26.7mA when the output is 1V. If
the output resistor is increased to 300Ω, the DAC only
needs to source 3.33mA when the output is 1V.
There is parasitic capacitance from the DAC output to
ground. That capacitance in parallel with the DAC out-
put resistor forms a pole that can potentially roll off the
frequency response of the video signal. For example,
300Ω in parallel with 50pF creates a pole at 10.6MHz.
To minimize this capacitance, reduce the area of the
signal trace attached to the DAC output as much as
possible, and place the MAX9517/MAX9524 as close
as possible to the video DAC outputs.
_______________________________________________________________________________________
9
IN_
SWITCH STATE
0
OFF
1ON
Table 1. Logic for Analog Switches
SPST Analog Switches
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9517EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX9517/24 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9519ARS+T | 功能描述:視頻放大器 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 |
| MAX951C/D | 功能描述:特殊用途放大器 Ultra-Low-Power Single-Supply Op Amp + Comparator + Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX951C/D+ | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX951EPA | 功能描述:特殊用途放大器 Op Amp / Comparator / Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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