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參數(shù)資料
| 型號(hào)： | ADM487EARZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5 V, 【15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 297K |
| 代理商： | ADM487EARZ-REEL7 |
ADM485E/ADM487E/ADM1487E
APPLICATIONS INFORMATION
DIFFERENTIAL DATA TRANSMISSION
Differential data transmission is used to reliably transmit data
at high rates over long distances and through noisy environ-
ments. Differential transmission nullifies the effects of ground
shifts and noise signals that appear as common-mode voltages
on the line. There are two main standards approved by TIA/EIA
that specify the electrical characteristics of transceivers used in
differential data transmission.
The RS-422 standard specifies data rates up to 10 MB and line
lengths up to 4000 feet. A single driver can drive a transmission
line with up to 10 receivers.
To cater to true multipoint communications, the RS-485 standard
is defined. This standard meets or exceeds all the requirements
of RS-422, but also allows for 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 differ-
ence between RS-422 and RS-485 is that the drivers can be
disabled, thereby allowing as many as 32 drivers to be connected
to a single line. Only one driver is enabled at a time, but the
RS-485 standard contains additional specifications to guarantee
device safety in the event of line contention.
Rev. 0 | Page 15 of 16
CABLE AND DATA RATE
The transmission line of choice for RS-485 communications is
a twisted pair. A twisted pair cable can cancel common-mode
noise and can also cause cancellation of the magnetic fields
generated by the current flowing through each wire, thereby
reducing the effective inductance of the pair.
A typical application showing a multipoint transmission net-
work is illustrated in Figure 29. An RS-485 transmission line
can have as many as 32 transceivers on the bus. Only one driver
can transmit at a particular time, but multiple receivers can be
enabled simultaneously.
D
R
D
R
R
R
D
D
0
RT
RT
Figure 29. Typical RS-485 Network
相關(guān)PDF資料 |
PDF描述 |
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| ADM1487 | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| ADM1487AN | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| ADM1487AR | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| ADM1487JN | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| ADM1487JR | Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM487EWARZ | 功能描述:IC TXRX HALF DUP RS485/422 8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:27 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 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:管件 |
| ADM487EWARZ-REEL7 | 功能描述:IC TXRX HALF DUP RS485/422 8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:121 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):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(yīng)商設(shè)備封裝:10-DFN（3x3） 包裝:管件 |
| ADM488 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers |
| ADM488A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers |
| ADM488ABRMZ | 功能描述:IC TXRX RS485/422 DIFF 10MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:121 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):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(yīng)商設(shè)備封裝:10-DFN（3x3） 包裝:管件 |
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