參數(shù)資料
型號: LT1785IS8#PBF
廠商: Linear Technology
文件頁數(shù): 3/16頁
文件大?。?/td> 0K
描述: IC TXRX RS485/RS422 60V 8-SOIC
標準包裝: 100
類型: 收發(fā)器
驅(qū)動器/接收器數(shù): 1/1
規(guī)程: RS422,RS485
電源電壓: 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 8-SOIC
包裝: 管件
產(chǎn)品目錄頁面: 1354 (CN2011-ZH PDF)
LT1785/LT1785A/
LT1791/LT1791A
11
178591fc
APPLICATIONS INFORMATION
Slew Limiting for EMI Emissions Control
The LT1785/LT1791 feature controlled driver output slew
rates to control high frequency EMI emissions from equip-
ment and data cables. The slew limiting limits data rate
operation to 250kbaud. Slew limiting also mitigates the
adverse affects of imperfect transmission line termina-
tion caused by stubs or mismatched cable. In some low
speed, short distance networks, cable termination may
be eliminated completely with no adverse effect on data
transmission.
Data Network Cable Selection and Termination
Long distance data networks operating at high data trans-
mission rates should use high quality, low attenuation
cable with well-matched cable terminations. Short distance
networks at low data rates may use much less expensive
PVC cable. These cables have characteristic impedances
as low as 72Ω. The LT1785/LT1791 output drivers are
guaranteed to drive cables as low as 72Ω.
Figure 9. Full-Duplex RS422
5
4
3
2
A
B
Z
Y
12
11
10
9
RO
RE
DE
DI
178591 F09
TX
120Ω
5
4
3
2
Y
Z
B
A
9
10
11
12
RO
LT1791
RE
DE
DI
RX
TX
120Ω
RX
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