參數(shù)資料
型號： ADV7184BSTZ
廠商： ANALOG DEVICES INC
元件分類： 顏色信號轉換
英文描述： Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述： COLOR SIGNAL DECODER, PQFP80
封裝： LEAD FREE, MS-026BEC, LQFP-80
文件頁數(shù)： 106/108頁
文件大?。?/td> 925K
代理商： ADV7184BSTZ
ADV7184
DIGITAL INPUTS
The digital inputs on the ADV7184 are 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.
Rev. 0 | Page 106 of 108
XTAL AND LOAD CAPACITOR VALUES SELECTION
Figure 49 shows an example reference clock circuit for the
ADV7184. Special care must be taken when using a crystal
circuit to generate the reference clock for the ADV7184. Small
variations in reference clock frequency may cause autodetection
issues and impair the ADV7184 performance.
C1 = 47pF
C2 = 47pF
XTAL
28.63636MHz
0
R = 1M
Ω
Figure 49. Crystal Circuit
Use the following guidelines to ensure correct operation:
Use the correct, 28.63636 MHz, frequency crystal.
Tolerance should be 50 ppm or better.
User a parallel-resonant crystal.
Know the C
load
for the crystal part selected. The values of
the C1 and C2 capacitors must be calculated using this
C
load
value.
To find C1 and C2, use the following formula:
C = 2(
C
load
C
stray
)
C
pg
where
C
stra
y
is usually 2 pF to 3 pF, depending on board traces,
and
C
pg
(pin-to-ground capacitance) is 4 pF for the ADV7184.
Example:
C
load
= 30 pF. C1 = 50 pF, C2 = 50 pF (in this case 47 pF is the
nearest real-life cap value to 50 pF)
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