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參數(shù)資料
| 型號： | ADM489ABRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/422 DIFF 14SOIC |
| 標準包裝： | 1,000 |
| 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： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOICN |
| 包裝： | 帶卷 (TR) |
ADM488A/ADM489A
Rev. A | Page 13 of 16
APPLICATIONS INFORMATION
DIFFERENTIAL DATA TRANSMISSION
Differential data transmission reliably transmits data at high
rates over long distances and through noisy environments.
Differential transmission nullifies the effects of ground shifts
and noise signals, which appear as common-mode voltages on
the line. Two main standards that specify the electrical charac-
teristics of transceivers used in differential data transmission are
approved by the EIA.
The RS-422 standard specifies data rates up to 10 Mbps and line
lengths up to 4000 ft. A single driver can drive a transmission
line with up to 10 receivers.
To cater to true multipoint communications, the RS-485 stan-
dard was defined to meet or exceed the requirements of RS-422.
It also allows up to 32 drivers and 32 receivers to be connected
to a single bus. An extended common-mode range of 7 V to
+12 V is defined. The most significant difference between the
RS-422 and RS-485 is that the RS-485 drivers can be disabled,
thereby allowing up to 32 receivers to be connected to a single
line. Only one driver should be enabled at a time, but the RS-485
standard contains additional specifications to guarantee device
safety in the event of line contention.
CABLE AND DATA RATE
The transmission line of choice for RS-485 communications is a
twisted pair. Twisted pair cable tends to cancel common-mode
noise and causes cancellation of the magnetic fields generated
by the current flowing through each wire, thereby reducing the
effective inductance of the pair.
The ADM488A/ADM489A are designed for bidirectional data
communications on multipoint transmission lines. A typical
application with a multipoint transmission network is illustrated
in Figure 22. An RS-485 transmission line can have up to 32
transceivers on the bus. Only one driver can transmit at a par-
ticular time, but multiple receivers can be simultaneously enabled.
As with any transmission line, it is important to minimize reflec-
tions. This can be achieved by terminating the extreme ends of the
line using resistors equal to the characteristic impedance of the
line. Keep stub lengths of the main line as short as possible. A
properly terminated transmission line appears purely resistive
to the driver.
Table 8. Comparison of RS-422 and RS-485 Interface Standards
Specification
RS-422
RS-485
Transmission Type
Differential
Maximum Data Rate
10 Mbps
Maximum Cable Length
4000 ft.
Minimum Driver Output Voltage
±2 V
±1.5 V
Driver Load Impedance
100
54
Receiver Input Resistance
4 k minimum
12 k minimum
Receiver Input Sensitivity
±200 mV
Receiver Input Voltage Range
7 V to +7 V
7 V to +12 V
Number of Drivers/Receivers per Line
1/10
32/32
D
R
D
R
D
R
RT
D
R
08498-
022
Figure 22. Typical RS-485 Network
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM489AN | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 14-Pin PDIP N 制造商:Analog Devices 功能描述:CMOS BUS TRANSCEIVER DIP14 489 制造商:Analog Devices 功能描述:Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers |
| ADM489ANZ | 功能描述:IC TXRX RS485 LO SLEW/EN 14DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1 系列:- 類型:線路收發(fā)器 驅(qū)動器/接收器數(shù):5/3 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:Digi-Reel® 產(chǎn)品目錄頁面:918 (CN2011-ZH PDF) 其它名稱:296-25096-6 |
| ADM489AR | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 14-Pin SOIC N 制造商:Analog Devices 功能描述:IC TRANSCEIVER RS485 |
| ADM489AR-REEL | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 14-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:FULL DUPLEX,RS-485 TRANSCEIVER I.C. - Tape and Reel |
| ADM489AR-REEL7 | 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-422/RS-485 14-Pin SOIC N T/R |
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