參數(shù)資料
型號(hào)： ADV7181B
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(yè)數(shù)： 91/96頁(yè)
文件大?。?/td> 873K
代理商： ADV7181B
ADV7181B
DIGITAL INPUTS
The digital inputs on the ADV7181B are designed to work with
3.3 V signals, and are not tolerant of 5 V signals. Extra compo-
nents are needed if 5 V logic signals are required to be applied
to the decoder.
Rev. 0 | Page 91 of 96
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 ADV7181B 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 43.
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 42. 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 ADV7181B 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
100k
30M
10M
3M
FREQUENCY (Hz)
1M
300k
300M
1G
100M
0
Figure 42. Third-Order Butterworth Filter Response
相關(guān)PDF資料
PDF描述
ADV7181BBCPZ Multiformat SDTV Video Decoder
ADV7181BBSTZ Multiformat SDTV Video Decoder
ADV7181BCP Multiformat SDTV Video Decoder
ADV7181BST Multiformat SDTV Video Decoder
ADV7183B Multiformat SDTV Video Decoder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7181BBCPZ 制造商:Analog Devices 功能描述:Video Decoder 3ADC 9-Bit 64-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:ADV718XB DECODER FAMILY UPDATES - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER
ADV7181BBSTZ 制造商:Analog Devices 功能描述:Video Decoder 3ADC 9-Bit 64-Pin LQFP 制造商:Analog Devices 功能描述:IC VIDEO ENCODER
ADV7181BCP 制造商:Analog Devices 功能描述:Video Decoder 3ADC 9-Bit 64-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:10BIT NTSC/PAL/SECAM VIDEO DECODER I.C. - Bulk
ADV7181BCPZ 制造商:Analog Devices 功能描述:
ADV7181BST 制造商:Analog Devices 功能描述:Video Decoder 3ADC 9-Bit 64-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:9-BIT BIT NTSC/PAL/SECAM VIDEO DECODER - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER
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