參數(shù)資料
型號: ADV7188
廠商: Analog Devices, Inc.
英文描述: Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述: 標(biāo)清多格式視頻解碼器支持快速開關(guān)重疊
文件頁數(shù): 107/112頁
文件大?。?/td> 943K
代理商: ADV7188
ADV7188
DIGITAL INPUTS
The digital inputs on the ADV7188 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 107 of 112
XTAL AND LOAD CAPACITOR VALUES SELECTION
Figure 49 shows an example reference clock circuit for the
ADV7188. Special care must be taken when using a crystal
circuit to generate the reference clock for the ADV7188. Small
variations in reference clock frequency may cause autodetection
issues and impair the ADV7188 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 ADV7188.
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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