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參數(shù)資料
| 型號： | ADM483E |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +-15 kV ESD Protected, EMC Compliant Slew Rate Limited, EIA RS-485 Transceiver |
| 中文描述： | -15千伏ESD保護，EMC公司符合擺率限制，環(huán)境影響評估的RS - 485收發(fā)器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 324K |
| 代理商： | ADM483E |
ADM483E
–9–
REV. 0
LOG FREQUENCY (0.15–30) – MHz
0.3
0.6
1
3
6
10
30
80
0
70
40
30
20
10
60
50
LIMIT
d
Figure 27. Conducted Emissions
RADIATED EMISSIONS
Radiated emissions are measured at frequencies in excess of
30 MHz.
A typical test setup for monitoring radiated emissions is
illustrated in Figure 28.
OUT
TURNTABLE
RADIATED NOISE
TO
RECEIVER
ADJUSTABLE
ANTENNA
Figure 28. Radiated Emissions Test Setup
Figure 29 shows that the level of radiated emissions is also well
below the allowable limit.
LIMIT
30
200
FREQUENCY – MHz
80
70
60
50
40
30
20
10
0
d
Figure 29. Radiated Emissions
APPLICATIONS INFORMATION
Differential Data Transmission
Differential data transmission is used to reliably transmit data at
high rates over long distances and through noisy environments.
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 the Electron-
ics Industries Association (EIA) that specify the electrical
characteristics of transceivers used in differential data transmission.
The RS-422 standard specifies data rates up to 10 MBaud and
line lengths up to 4000 ft. A single driver can drive a transmis-
sion line with up to 10 receivers.
In order to cater for true multipoint communications, the RS-
485 standard was 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 difference between RS-422 and RS-485 is the fact
that the drivers may be disabled, thereby allowing more than
one (32 in fact) 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 also causes 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 network
is illustrated in Figure 30. 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 may be
enabled simultaneously.
RT
RT
D
R
D
R
D
R
R
D
Figure 30. Typical RS-485 Network
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM483EAN | 功能描述:IC TX/RX RS-485 LO-SLEW 5V 8DIP 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:27 系列:- 類型:收發(fā)器 驅動器/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） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM483EANZ | 功能描述:IC TX/RX RS-485 LO-SLEW 5V 8DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/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） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| ADM483EANZ | 制造商:Analog Devices 功能描述:Transceiver IC |
| ADM483EAR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:TRANSCEIVER IC RS485 3.3V SO8 ((NS)) |
| ADM483EAR-1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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