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參數資料
| 型號： | LTC485 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Power RS485 Interface Transceiver |
| 中文描述： | 低功率485接口收發(fā)器 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LTC485 |
9
LTC485
APPLICATIU
LTC485 Line Length vs Data Rate
The maximum line length allowable for the RS422/RS485
standard is 4000 feet.
U
W
U
Figures 17 and 18 show that the LTC485 is able to
comfortably drive 4000 feet of wire at 110kHz.
Figure 14. Line Length Test Circuit
TTL
OUT
LTC485
LTC485
NOISE
GENERATOR
100
C
D
4000 FT 26AWG
TWISTED PAIR
A
B
TTL
IN
Using the test circuit in Figure 14, Figures 15 and 16 show
that with ~20V
P-P
common-mode noise injected on the
line, The LTC485 is able to reconstruct the data stream at
the end of 4000 feet of twisted pair wire.
RO
DIFFERENTIAL
VOLTAGE A – B
DI
LTC485 F16
Figure 16. System Differential Voltage at 19.2kHz
Figure 15. System Common-Mode Voltage at 19.2kHz
COMMON-MODE
VOLTAGE (A + B)/2
RO
DI
LTC485 F15
Figure 17. System Common-Mode Voltage at 110kHz
RO
COMMON-MODE
VOLTAGE (A + B)/2
DI
LTC485 F17
RO
COMMON-MODE
VOLTAGE (A – B)
DI
LTC485 F18
Figure 18. System Differential Voltage at 110kHz
When specifying line length vs maximum data rate the
curve in Figure 19 should be used:
Figure 19. Cable Length vs Maximum Data Rate
MAXIMUM DATA RATE
10k
10
C
100
1k
10k
100k
1M
10M
LTC485 F19
2.5M
相關PDF資料 |
PDF描述 |
|---|---|
| LTC485C | Low Power RS485 Interface Transceiver |
| LTC485CJ8 | Low Power RS485 Interface Transceiver |
| LTC485CN8 | Low Power RS485 Interface Transceiver |
| LTC485CS8 | Low Power RS485 Interface Transceiver |
| LTC485I | Low Power RS485 Interface Transceiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC485CJ8 | 制造商:Linear Technology 功能描述:Single Transmitter/Receiver RS-422/RS-485 8-Pin CDIP |
| LTC485CN8 | 功能描述:IC TXRX INTRFC RS485 LOPWR 8-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數:1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| LTC485CN8#PBF | 功能描述:IC TXRX INTRFC RS485 LOPWR 8-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:98 系列:* |
| LTC485CN8PBF | 制造商:Linear Technology 功能描述:LTC485CN8PBF |
| LTC485CS8 | 功能描述:IC TXRX INTRFC RS485 LOPWR 8SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數:1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
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