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參數(shù)資料
| 型號： | ADM1487EARZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX HALF DUP RS485/422 8SOIC |
| 標(biāo)準(zhǔn)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： | 4.75 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(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
ADM485E/ADM487E/ADM1487E
Rev. B | Page 15 of 16
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.
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
RR
R
D
06
35
6-
0
15
RT
Figure 29. Typical RS-485 Network
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| ADM1487JN | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection |
| ADM1487JR | 制造商:Analog Devices 功能描述:LINE TRNSCVR 1TR 1TX 1RX 8SOIC - Bulk |
| ADM1490E | 制造商:AD 制造商全稱:Analog Devices 功能描述:16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers |
| ADM1490EBRMZ | 功能描述:IC TXRX RS485 FULL DUPLEX 8MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 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:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| ADM1490EBRMZ-REEL7 | 功能描述:IC TXRX RS485 FULL DUPLEX 8MSOP 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(biāo)準(zhǔn)包裝:121 系列:- 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: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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