- 您现在的位置：买卖IC网 > PDF目录10198 > ADM488ARZ-REEL (Analog Devices Inc)IC TXRX RS-485 DIFF LP 8SOIC PDF资料下载
参数资料
| 型号： | ADM488ARZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-485 DIFF LP 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
ADM488/ADM489
Rev. D | Page 14 of 16
APPLICATION 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, which appear as common-mode voltages on
the line. Two main standards that specify the electrical
characteristics of transceivers used in differential data
transmission are approved by the EIA.
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.
To cater to true multipoint communications, the RS-485 stan-
dard was defined to meet or exceed the requirements of RS-422.
It 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 the
RS-422 and RS-485 is that the RS-485 drivers can be disabled,
thereby allowing up to 32 receivers 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 gener-
ated by the current flowing through each wire, thereby reducing
the effective inductance of the pair.
The ADM488/ADM489 are designed for bidirectional data
communications on multipoint transmission lines. A typical
application showing a multipoint transmission network is
illustrated in Figure 30. An RS-485 transmission line can have
up to 32 transceivers on the bus. Only one driver can transmit
at a particular time, but multiple receivers can be simultane-
ously enabled.
As with any transmission line, it is important that reflections be
minimized. This can be achieved by terminating the extreme
ends of the line using resistors equal to the characteristic im-
pedance 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.
Table 10. Comparison of RS-422 and RS-485 Interface Standards
Specification
RS-422
RS-485
Transmission Type
Differential
Maximum Data Rate
10 MB/s
Maximum Cable Length
4000 ft.
Minimum Driver Output Voltage
±2 V
±1.5 V
Driver Load Impedance
100 Ω
54 Ω
Receiver Input Resistance
4 kΩ minimum
12 kΩ minimum
Receiver Input Sensitivity
±200 mV
Receiver Input Voltage Range
7 V to +7 V
7 V to +12 V
Number of Drivers/Receivers per Line
1/10
32/32
D
R
D
R
D
R
RT
D
R
00
079
-03
0
Figure 30. Typical RS-485 Network
相关PDF资料 |
PDF描述 |
|---|---|
| EN3P13M26SX | CONN RCPT 13POS MALE PANEL #26 |
| LTC1481CN8 | IC TXRX RS485 LOWPWR W/SHTDN8DIP |
| ADM485ARMZ-REEL7 | IC TXRX RS-485 5V 5MBPS 8MSOP |
| ADM3222ARUZ-REEL7 | IC TXRX RS-232 3.3V W/SD 20TSSOP |
| SP3239EEA-L/TR | IC TXRX RS232 INTELLIGENT 28SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM488ARZ-REEL7 | 功能描述:IC TXRX RS-485 DIFF 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 |
| ADM489 | 制造商:AD 制造商全称:Analog Devices 功能描述:Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers |
| ADM489A | 制造商:AD 制造商全称:Analog Devices 功能描述:Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers |
| ADM489ABRMZ | 功能描述:IC TXRX RS485/422 DIFF 10MSOP 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 |
| ADM489ABRMZ-REEL7 | 功能描述:IC TXRX RS485/422 DIFF 10MSOP 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 |
发布紧急采购，3分钟左右您将得到回复。