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參數資料
| 型號： | MAX11508EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVALUATION FOR MAX11508 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 主要目的： | 視頻，視頻處理 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MAX11508 |
| 主要屬性： | 3 通道視頻濾波器，帶輸出緩沖器 |
| 次要屬性： | AC 或 DC 耦合輸入和輸出 |
| 已供物品： | 板 |
MAX11508/MAX11509
Low-Cost, 3-Channel, HD/PS/SD/BP
Video Filters with Buffer
______________________________________________________________________________________
11
Filters
The MAX11508 filter characteristic provides excellent
time-domain response with low overshoot and guaran-
tees minimal attenuation in the passband. The
MAX11509 filters offer a small gain peaking response to
counter system rolloff.
Select filter frequency with inputs FSEL0 and FSEL1, as
shown in Table 1.
Standard-Definition (SD) Filters
The MAX11508 SD filters have a 9MHz (typ) -3dB fre-
quency, while the MAX11509 SD filters offer a 10MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 5MHz (typ). Both devices have a stopband
attenuation of +48dB (typ) at 27MHz.
Progressive-Scan (PS) Filters
The MAX11508 PS filters have a 16MHz (typ) -3dB fre-
quency, while the MAX11509 PS filters offer a 17MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 8.5MHz (typ). Both devices have a stopband
attenuation of +44dB (typ) at 54MHz.
High-Definition (HD) Filters
The MAX11508 HD filters have a 33MHz (typ) -3dB fre-
quency, while the MAX11509 HD filters offer a 34MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 20MHz (typ). Both devices have a stopband
attenuation of +45dB (typ) at 74.25MHz.
Bypassing the Filters
The MAX11508/MAX11509 filter bypass circuitry offers
a 60MHz (typ) -3dB frequency. Bypassed filters offer no
gain peaking.
Output Buffer
The MAX11508/MAX11509 feature output buffers with
+6dB gain that drive a standard 150 video load at
2VP-P. A typical load consists of a 75 backmatch
resistor, an optional 220F or larger coupling capacitor,
and a 75 termination resistor.
An offset of 550mV is added at the output. The offset
ensures that the blanking level on the output is less
than 1V after the backmatch resistor, thus meeting digi-
tal TV specifications allowing the devices to drive video
loads directly without using costly AC-coupling capaci-
tors. The basic output voltage equation of all filters is:
VOUT = (2 x VIN) + 0.55V
Typical voltage waveforms are shown in Figures 2 and 3.
Shutdown
Forcing digital input SHDN low places the MAX11508/
MAX11509 into low-power shutdown mode. In shut-
down, the device consumes only 1A (typ), and the
outputs are internally connected to GND through
1.58k resistors. In shutdown, the input clamps are dis-
abled and the inputs are internally connected to GND
through 350k resistors. When shutdown is forced low
while BIAS is low, the bias network remains active, but
the bias voltage changes from its nominal 0.59V to
0.475V (typ).
Applications Information
Output Considerations
DC- or AC-couple the MAX11508/MAX11509 outputs.
These devices, with +6dB gain, are typically connected
to a 75 series backmatch resistor followed by a video
cable. Choose an AC-coupling capacitor value that
ensures that the lowest frequency content in the video
signal is passed and the field-time distortion is kept
within desired limits when using an AC connection. The
selection of this value is a function of the input imped-
ance, and more importantly, the input leakage of the
circuit being driven. Common industry practice is to
use a 220F or larger capacitor.
The MAX11508/MAX11509 outputs are fully protected
against short circuits to ground. The short-circuit pro-
tection circuitry limits the output current to 75mA (typ)
per output. Shorting more than one output to ground
simultaneously may exceed the maximum package
power dissipation.
PCB Layout Recommendations
Connect the power and ground traces to large copper
areas to enhance power dissipation. Bypass VCC to
GND with 0.1F and 1.0F capacitors. Place the 0.1F
capacitor closest to VCC. Use surface-mount capaci-
tors for their low inductance. Place traces carrying
video signals appropriately to avoid mutual coupling.
When inputs are AC-coupled, place the capacitors as
close as possible to the device and keep traces short
to minimize parasitic capacitance and inductance.
Refer to the MAX11508/MAX11509 evaluation kit data
sheet for PCB layout.
Chip Information
PROCESS: BiCMOS
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX11508EVKIT+ | 功能描述:視頻 IC 開發(fā)工具 3Ch HD/PS/SD/BP Video Filters & Buff RoHS:否 制造商:Texas Instruments 產品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V |
| MAX11508UUD+ | 功能描述:視頻 IC 3Ch HD/PS/SD/BP Video Filters & Buff RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX11508UUD+T | 功能描述:視頻 IC 3Ch HD/PS/SD/BP Video Filters & Buff RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX11509 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer |
| MAX11509UUD+ | 功能描述:視頻 IC 3Ch HD/PS/SD/BP Video Filters & Buff RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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