- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370213 > FMS988AKAC140 Signal Conditioner PDF資料下載
參數(shù)資料
| 型號： | FMS988AKAC140 |
| 英文描述： | Signal Conditioner |
| 中文描述： | 信號調(diào)理 |
| 文件頁數(shù)： | 26/29頁 |
| 文件大?。?/td> | 481K |
| 代理商： | FMS988AKAC140 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當(dāng)前第26頁第27頁第28頁第29頁
PRODUCT SPECIFICATION
FMS9875
26
REV. 1.2.15 1/14/02
Printed Wiring Board Design Guidelines
Recommended strategy is to mount the FMS9875 over a
ground plane with carefully routed analog inputs and digital
outputs. All connections should be treated as transmission
lines to ensure that reflections due to mismatches are mini-
mized and ground return currents do not interfere with critical
signals.
Analog Inputs
Recommendations:
1.
Keep analog trace lengths short to minimize crosstalk.
Terminate analog inputs with 75
resistors, placed
close to the FMS9875 analog inputs, R
IN
, G
IN
and B
IN
.
By matching transmission line impedances, reflections
will be minimized.
Layout traces as 75
transmission lines.
2.
3.
4.
Avoid running analog traces near digital traces. Due to
the wide input bandwidth (400MHz) digital noise can
easily leak into analog inputs or cause excessive PLL
jitter.
5.
If necessary, limit bandwidth by adding a ferrite bead in
series with each RGB input as shown in Figure 25. A
Fair-Rite #2508051217Z0 is recommended. Alternatively,
bandwidth reduction using a shunt 10pF capacitor may
reduce snow (intensity noise) caused by HF noise riding
on the RGB input. Mismatches, reflections and noise
may cause ringing or distortion of the incoming video
signals.
6.
Locate the PLL filter close to the FMS9875 package and
clear of other signals.
7.
Bypass the reference with a 0.1μF capacitor to ground.
Figure 25. RGB Input Filter Options
Digital I/O
Recommendations:
1.
Route digital I/O signals clear of analog inputs.
2.
Terminate clock lines to reduce reflections. Treat clock
lines as transmission lines.
3.
Scale the HSIN input to 3.3V, using a resistor network
or a series 1 k
resistor.
4.
Limit Serial Port inputs voltages applied to SDA and
SDL pins with 150
resistors connected directly to the
pins.
5.
If necessary, to reduce reflections, EMI or spikes add a
50–200
resistor at each data output pin.
6.
If necessary, to reduce reflections, EMI or spikes add a
50–200
resistor at each data output pi.
7.
To minimize noise within the FMS9875, restrict the
capacitive load at the digital outputs to < 10pF.
Power and Ground
A schematic of the recommended power distribution is
shown in Figure 26. Note that:
1.
Analog and digital circuits are layed out over a common
solid ground plane.
2.
Each FMS9875 pin is decoupled with a 0.1μF capacitor.
3.
A group of pins may be de-coupled through a common
capacitor if no pin is more than 5 mm from the capacitor.
4.
A separate regulated supply is used for the phase-locked
loop power supply, V
DDP
.
Capacitors are attached to each PLL pin or pin-pair.
5.
R
IN
, G
IN
, B
IN
R, G, B INPUT
R1
75
L1
BEAD
C1
47 nF
C2
10pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FMU1 | TRANSISTOR | SOT-143R |
| RU101K | TRANSISTOR | SOT-23 |
| FMU3-48R000 | Logic IC |
| FMU3-48R000M | Logic IC |
| FMU3-60R000 | Logic IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FMSA125 | 制造商:MicroSwitch 功能描述:4-DAY SHIPPING -Inductive |
| FMSA-461 | 制造商:INTERPOINT 制造商全稱:INTERPOINT 功能描述:EMI INPUT FILTER 28 VOLT INPUT |
| FMSA-461/883 | 制造商:INTERPOINT 制造商全稱:INTERPOINT 功能描述:EMI INPUT FILTER 28 VOLT INPUT |
| FMS-A-C0 | 制造商:Panduit Corp 功能描述: |
| FMSC1125-W | 制造商:FLORIDA MISC. 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。