Datasheet > 驱动程序和接口 > 线路驱动器或接收器> ADM1485JR-REEL

ADM1485JR-REEL

更新时间： 2024-01-30 05:01:11

品牌	Logo	应用领域
亚德诺 - ADI		线路驱动器或接收器驱动程序和接口接口集成电路光电二极管信息通信管理
页数	文件大小	规格书
11页	356K
描述
5 V Low Power EIA RS-485 Transceiver

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技术参数
数据手册

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ADM1485JR-REEL 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOIC-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.7
Samacsys Confidence：	3	Samacsys Status：	Released
2D Presentation：	https://componentsearchengine.com/2D/0T/236838.1.2.png	Schematic Symbol：	https://componentsearchengine.com/symbol.php?partID=236838
PCB Footprint：	https://componentsearchengine.com/footprint.php?partID=236838	3D View：	https://componentsearchengine.com/viewer/3D.php?partID=236838
Samacsys PartID：	236838	Samacsys Image：	https://componentsearchengine.com/Images/9/ADM1485JRZ-REEL.jpg
Samacsys Thumbnail Image：	https://componentsearchengine.com/Thumbnails/1/ADM1485JRZ-REEL.jpg	Samacsys Pin Count：	8
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Small Outline Packages
Samacsys Footprint Name：	R-8 (SOIC)	Samacsys Released Date：	2015-11-06 07:15:09
Is Samacsys：	N	其他特性：	THERMAL SHUTDOWN PROTECTION
差分输出：	YES	驱动器位数：	1
高电平输入电流最大值：	0.000001 A	输入特性：	DIFFERENTIAL SCHMITT TRIGGER
接口集成电路类型：	LINE TRANSCEIVER	接口标准：	EIA-422; EIA-485
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e3
长度：	4.9 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
最小输出摆幅：	1.5 V	输出特性：	3-STATE
最大输出低电流：	0.004 A	输出极性：	COMPLEMENTARY
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
最大接收延迟：	40 ns	接收器位数：	1
座面最大高度：	1.75 mm	子类别：	Line Driver or Receivers
最大压摆率：	2.2 mA	最大供电电压：	5.25 V
最小供电电压：	4.75 V	标称供电电压：	5 V
表面贴装：	YES	技术：	BICMOS
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
最大传输延迟：	15 ns	宽度：	3.9 mm
Base Number Matches：	1

ADM1485JR-REEL 数据手册

ADM1485

APPLICATION INFORMATION

Differential Data Transmission

As with any transmission line, it is important that reflections are

minimized. This can be achieved by terminating the extreme ends

of the line using resistors equal to the characteristic 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.

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) that specify the electrical charac-

teristics 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 transmission

line with up to 10 receivers.

In order to cater to true multipoint communications, the RS-485

standard was defined. This standard meets or exceeds all the

requirements of the RS-422 but also allows for up to 32 drivers

and 32 receivers to be connected to a single bus. An extended com-

mon-mode range of –7 V to +12 V is defined. The most

significant difference between the RS-422 and the 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.

Figure 5. Typical RS-485 Network

Thermal Shutdown

The ADM1485 contains thermal shutdown circuitry that protects

the part from excessive power dissipation during fault conditions.

Shorting the driver outputs to a low impedance source can result

in high driver currents. The thermal sensing circuitry detects the

increase in die temperature and disables the driver outputs. The

thermal sensing circuitry is designed to disable the driver outputs

when a die temperature of 150°C is reached. As the device cools,

the drivers are re-enabled at 140°C.

Table III. Comparison of RS-422 and RS-485 Interface Standards

Specification

RS-422

RS-485

Transmission Type

Differential

4000 ft.

2 V

100 Ω

4 kΩ min

200 mV

Differential

4000 ft.

1.5 V

54 Ω

12 kΩ min

200 mV

Maximum Cable Length

Minimum Driver Output Voltage

Driver Load Impedance

Receiver Input Resistance

Receiver Input Sensitivity

Receiver Input Voltage Range

Propagation Delay

The ADM1485 features very low propagation delay, ensuring

maximum baud rate operation. The driver is well balanced,

ensuring distortion free transmission.

–7 V to +7 V –7 V to +12 V

No. of Drivers/Receivers per Line 1/10

32/32

Another important specification is a measure of the skew between

the complementary outputs. Excessive skew impairs the noise

immunity of the system and increases the amount of electro-

magnetic interference (EMI).

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.

Receiver Open-Circuit Fail-Safe

The receiver input includes a fail-safe feature that guarantees a

logic high on the receiver when the inputs are open circuit or

floating.

The ADM1485 is designed for bidirectional data communications

on multipoint transmission lines. A typical application showing

a multipoint transmission network is illustrated in Figure 5.

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.

REV.

–8–

1...5 6 789 10 11

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与ADM1485JR-REEL相关器件

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ADM1485JRZ	ADI	5 V Low Power EIA RS-485 Transceiver	获取价格
ADM1485JRZ-REEL	ADI	5 V Low Power EIA RS-485 Transceiver	获取价格
ADM1486	ADI	+5 V Low Power RS-485 PROFIBUS Transceiver	获取价格
ADM1486_05	ADI	5 V, 0.8 mA PROFIBUS RS-485 Transceiver	获取价格
ADM1486AN	ADI	+5 V Low Power RS-485 PROFIBUS Transceiver	获取价格
ADM1486AQ	ADI	+5 V Low Power RS-485 PROFIBUS Transceiver	获取价格

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