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參數(shù)資料
| 型號： | ADV7189 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat SDTV Video Decoder |
| 中文描述： | 標(biāo)清多格式視頻解碼器 |
| 文件頁數(shù)： | 101/104頁 |
| 文件大?。?/td> | 890K |
| 代理商： | ADV7189 |
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ADV7189
Digital Inputs
The digital inputs on the ADV7189 were designed to work with
3.3 V signals, and are not tolerant of 5 V signals. Extra
components are needed if 5 V logic signals are required to be
applied to the decoder.
Antialiasing Filters
For inputs from some video sources that are not bandwidth
limited, signals outside the video band can alias back into the
video band during A/D conversion and appear as noise on the
output video. The ADV7189 oversamples the analog inputs by a
factor of 4. This 54 MHz sampling frequency reduces the
requirement for an input filter; for optimal performance it is
recommended that an antialiasing filter be employed. The
recommended low cost circuit for implementing this buffer and
filter circuit for all analog input signals is shown in Figure 41.
Rev. A | Page 101 of 104
The buffer is a simple emitter-follower using a single npn
transistor. The antialiasing filter is implemented using passive
components. The passive filter is a third-order Butterworth
filter with a –3 dB point of 9 MHz. The frequency response of
the passive filter is shown in Figure 40. The flat pass band up to
6 MHz is essential. The attenuation of the signal at the output of
the filter due to the voltage divider of R24 and R63 is compen-
sated for in the ADV7189 part using the automatic gain control.
The ac coupling capacitor at the input to the buffer creates a
high-pass filter with the biasing resistors for the transistor. This
filter has a cut-off of
{2 × π × (R39||R89) × C93}
–1
= 0.62 Hz
It is essential that the cutoff of this filter be less than 1 Hz to
ensure correct operation of the internal clamps within the part.
These clamps ensure that the video stays within the 5 V range of
the op amp used.
0
–20
–40
–60
–80
–100
–120
100kHz
30MHz
10MHz
3MHz
1MHz
300kHz
300MHz
1GHz
100MHz
0
FREQUENCY
Figure 40. Third-Order Butterworth Filter Response
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PDF描述 |
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| ADV7189KST | Multiformat SDTV Video Decoder |
| ADV7195 | Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| ADV7195KST | Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| ADV7196 | Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision |
| ADV7196A | Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7189B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BBSTZ | 功能描述:IC VIDEO DECODER SDTV 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7189BBSTZ268H | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BBSTZ268H2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BKST | 制造商:Analog Devices 功能描述: |
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