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参数资料
| 型号： | ADM1491EBRMZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX FULLDUP RS485/422 10MSOP |
| 标准包装： | 1,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
ADM1490E/ADM1491E
Data Sheet
Rev. D | Page 12 of 16
APPLICATIONS INFORMATION
DIFFERENTIAL DATA
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 that appear as common-mode voltages on the
line. There are two main standards approved by the Electronics
Industries Association (EIA) that specify the electrical char-
acteristics of transceivers used in differential data transmission.
The RS-422 standard specifies data rates of up to 10 MBaud and
line lengths of up to 4000 feet. A single driver can drive a trans-
mission line with as many as 10 receivers.
The RS-485 standard addresses true multipoint communications.
This standard meets or exceeds all of the requirements of RS-422,
and it allows as many as 32 drivers and 32 receivers to connect
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 the RS-485 is that the drivers with RS-485 can be
disabled, allowing more than one driver to be connected to a
single line, with as many as 32 drivers 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
Twisted pair is the transmission line of choice for RS-485
communications. 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.
An RS-485 transmission line can have as many as 32 trans-
ceivers on the bus. Only one driver can transmit at a time, but
multiple receivers may be enabled simultaneously.
As with any transmission line, it is important to minimize
reflections. 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.
TYPICAL APPLICATIONS
Figure 29 shows a typical configuration for a full-duplex point-
to-point application using the ADM1490E. Figure 30 shows a
typical configuration for a full-duplex multipoint application
using the ADM1491E. To minimize reflections, the lines must
be terminated at the receiving end in its characteristic impedance,
and stub lengths off the main line must be kept as short as possible.
R
D
RO
DI
ADM1490E
A
B
Z
Y
R
D
RO
DI
ADM1490E
A
B
Z
Y
NOTES
1. MAXIMUM NUMBER OF NODES = 32.
07430-
027
VCC
GND
VCC
RT
Figure 29. Typical Point-to-Point Full-Duplex Application
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| ADM1491EBRZ | 功能描述:IC TXRX FULLDUP RS485/422 14SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| ADM1491EBRZ-REEL7 | 功能描述:IC TXRX FULLDUP RS485/422 14SOIC 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 |
| ADM151-1/12VDC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| ADM151-1/24VDC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| ADM151-1/48VDC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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