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| 型號： | LC89210 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | High-speed fax modem data pump |
| 中文描述： | 高速傳真調(diào)制解調(diào)器數(shù)據(jù)泵 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 199K |
| 代理商： | LC89210 |
No. 5382-9/10
LC89210
Printed Circuit Board Design Guidelines
While the two most important factors influencing the performance of this fax modem are the performance of the
LC89210 itself and the appropriateness of the design of the printed circuit board, it is not the purpose of this section to
describe all aspects of modem printed circuit board design. Rather, this section presents the following few
recommendations.
1. 4-layer boards
The digital and analog system grounds should be separated and then connected at a single point (single-point
ground). Furthermore, the location of the single-point ground should be as close to the LC89210 as is possible.
AGNDR and AGNDT should be connected to the single-point ground location with an extremely low impedance.
2. 2-layer boards
Supply the ground grid to all empty spaces and the inner side of component spaces.
3. The 2.2 nF capacitors connected to the RXA1 and RXA2 pins should be located as close to the pins as possible.
4. The two 100 nF capacitors connected to the V
REFP
and V
REFN
pins should be located as close to the pins as possible.
5. To prevent latchup due to differences in power on timing between the analog and digital power supplies, insert two
diodes with reverse polarities in parallel between the V
DD
(digital) and AV
DD
(analog) power supplies.
Application Example
Note: The capacitors marked with asterisks (
*
) must be connected as close as possible to the LC89210 pins.
Signal names ending in “I” are active low signals.
If it is necessary to supply current to V
CM
, add the resistors R3, R4, R5, and R6.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC8935 | CMOS LSI |
| LC8945 | SCSI (Small Computer System Interface) Protocol Controller |
| LC89510 | CMOS LSI |
| LC895124 | CD-ROM Driver with On-Chip SCSI Interface and Subcode Functions(CD-ROM驅(qū)動器帶片上SCSI接口和子代碼功能) |
| LC895125Q | CD-ROM Driver with On-Chip SCSI Interface and Subcode Functions(CD-ROM驅(qū)動器（片上帶SCSI接口和子代碼功能）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC8935 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CMOS LSI |
| LC8945 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:SCSI (Small Computer System Interface) Protocol Controller |
| LC89510 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CMOS LSI |
| LC895124 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CD-ROM Driver with On-Chip SCSI Interface and Subcode Functions |
| LC895125Q | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:CD-ROM Driver with On-Chip SCSI Interface and Subcode Functions |
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