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参数资料
| 型号： | ADM483JR-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通用总线功能 |
| 英文描述： | 5 V Low Power, Slew-Rate Limited RS-485/RS-422 Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封装： | MS-012AA, SOIC-8 |
| 文件页数： | 11/16页 |
| 文件大小： | 209K |
| 代理商： | ADM483JR-REEL |
ADM483
APPLICATIONS
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 Electronics Industries Association (EIA),
which specify the electrical characteristics of transceivers
used in differential data transmission.
Rev. 0 | Page 11 of 16
The RS-422 standard specifies data rates up to 10 Mbaud
and line lengths up to 4000 ft. A single driver can drive a
transmission line with up to 10 receivers.
To achieve true multipoint communications, the RS-485
standard was defined. This standard meets or exceeds all the
requirements of RS-422, but 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 RS-422 and RS-485 is that the drivers may
be disabled, allowing up to 32 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.
Table 5. Comparison of RS-422 and RS-485 Interface Standards
Specification
Transmission Type
Maximum Cable Length
Minimum Driver Output Voltage
Driver Load Impedance
Receiver Input Resistance
Receiver Input Sensitivity
Receiver Input Voltage Range
Drivers/Receivers per Line
CABLE AND DATA RATE
The preferred transmission line for RS-485 communications
is a twisted pair. Twisted pair cable tends to cancel common-
mode noise and the magnetic fields generated by the current
flowing through each wire, thereby reducing the effective
inductance of the pair.
RS-422
Differential
4000 ft.
±2 V
100
4 k min
±200 mV
–7 V to +7 V
1/10
RS-485
Differential
4000 ft.
±1.5 V
54
12 k min
±200 mV
–7 V to +12 V
32/32
The ADM483 is designed for bidirectional data communica-
tions on multipoint transmission lines. A typical application
showing a multipoint transmission network is shown in
Figure 24
. 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 simul-
taneously. As with any transmission line, it is important to
minimize reflections. This can be done by terminating the
extreme ends of the line by using resistors equal to the char-
acteristic impedance of the line. Stub lengths of the main
line should also be kept as short as possible. A properly
terminated transmission line appears purely resistive to
the driver.
0
RO
RE
DE
DI
D
R
A
B
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS: 32
ADM483
RO
RE
DE
DI
D
R
A
B
ADM483
R
ADM483
D
RO
RE DE
DI
A
B
R
ADM483
D
RO
RE DE
DI
A
B
Figure 24. Typical Half-Duplex RS-485 Network Topology
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM483JR-REEL7 | 功能描述:IC TXRX RS-485/422 5V LP 8SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| ADM483JRZ | 功能描述:IC TXRX RS-485/422 5V LP 8SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| ADM485 | 制造商:AD 制造商全称:Analog Devices 功能描述:+5 V Low Power EIA RS-485 Transceiver |
| ADM4850 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers |
| ADM4850_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers |
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