參數(shù)資料
型號(hào)： STHDMI002ABTR
廠商： STMICROELECTRONICS
元件分類： 多路復(fù)用及模擬開關(guān)
英文描述： 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PQFP48
封裝： 0.50 MM PITCH, TQFP-48
文件頁(yè)數(shù)： 13/26頁(yè)
文件大?。?/td> 579K
代理商： STHDMI002ABTR
Application information
STHDMI002A
20/26
9
Application information
9.1
Power supply sequencing
Proper power-supply sequencing is advised for all CMOS devices. It is recommended
to always apply VCC before applying any signals to the input/output or control pins.
9.2
Supply bypassing
Bypass each of the VCC pins with 0.1F and 1nF capacitors in parallel as close to the device as
possible, with the smaller-valued capacitor as close to the VCC pin of the device as possible.
9.3
Differential traces
The high-speed TMDS inputs are the most critical parts for the device. There are several
considerations to minimize discontinuities on these transmission lines between the connectors
and the device.
a)
Maintain 100-
differential transmission line impedance into and out of the
STHDMI002A.
b)
Keep an uninterrupted ground plane below the high-speed I/Os.
c)
Keep the ground-path vias to the device as close as possible to allow the shortest
return current path.
d)
Layout of the TMDS differential inputs should be with the shortest stubs from the
connectors.
Output trace characteristics affect the performance of the STHDMI002A. Use controlled
impedance traces to match trace impedance to both the transmission medium impedance and
termination resistor. Run the differential traces close together to minimize the effects of the
noise. Reduce skew by matching the electrical length of the traces. Avoid discontinuities in the
differential trace layout. Avoid 90 degree turns and minimize the number of vias to further
prevent impedance discontinuities.
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