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参数资料
| 型号： | ADM2481BRWZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX ISOLATED RS-485 16SOIC |
| 标准包装： | 400 |
| 系列： | iCoupler® |
| 类型： | 收发器，隔离式 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422/RS485 |
| 电源电压： | 3.3V，5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
ADM2481
Data Sheet
Rev. A | Page 16 of 20
APPLICATIONS INFORMATION
PRINTED CIRCUIT BOARD (PCB) LAYOUT
The ADM2481 signal isolated RS-485 transceiver requires no
external interface circuitry for the logic interfaces. Power supply
bypassing is required at the input and output supply pins (see
Bypass capacitors are most conveniently connected between
Pin 1 and Pin 2 for VDD1 and between Pin 15 and Pin 16 for
VDD2. The capacitor value must be between 0.01 μF and 0.1 μF.
The total lead length between both ends of the capacitor and
the input power supply pin must not exceed 20 mm.
VDD1
GND1
RxD
RE
DE
TxD
GND1
VDD2
GND2
NC
B
A
NC
GND2
NC = NO CONNECT
ADM2481
0
89
20
-12
7
Figure 29. Recommended Printed Circuit Board Layout
In applications involving high common-mode transients, take
care to ensure that board coupling across the isolation barrier
is minimized. Furthermore, the board layout must be designed
such that any coupling that does occur equally affects all pins
on a given component side.
Failure to ensure this can cause voltage differentials between
pins that exceed the absolute maximum ratings of the device,
thereby leading to latch-up or permanent damage.
ISOLATED POWER SUPPLY CIRCUIT
The ADM2481 requires isolated power capable of 5 V at
100 mA to be supplied between the VDD2 and GND2 pins. If
no suitable integrated power supply is available, a discrete
circuit, such as the one in Figure 30, can be used. A center-
tapped transformer provides electrical isolation. The primary
winding is excited with a pair of square waveforms that are 180°
out of phase with each other. A pair of Schottky diodes and a
smoothing capacitor are used to create a rectified signal from
the secondary winding. The ADP3330 linear voltage regulator
provides a regulated power supply to the bus-side circuitry of
the ADM2481.
08
92
0-
0
29
VCC
ISOLATION
BARRIER
SD103C
22F
++
10F
SD103C
78253
IN
SD
ERR
NR
OUT
5V
GND
ADP3330
VCC
VDD1
VDD2
GND1
GND2
ADM2481
TRANSFORMER
DRIVER
Figure 30. Isolated Power Supply Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM2482E | 制造商:AD 制造商全称:Analog Devices 功能描述:2.5 kV Isolated RS-485 Transceivers with Integrated Transformer Driver |
| ADM2482EBRWZ | 功能描述:IC TXRX RS485 ISO W/ESD 16SOIC 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:1 系列:- 类型:线路收发器 驱动器/接收器数:5/3 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:Digi-Reel® 产品目录页面:918 (CN2011-ZH PDF) 其它名称:296-25096-6 |
| ADM2482EBRWZ-REEL7 | 功能描述:IC TXRX RS485 ISO W/ESD 16SOIC 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:250 系列:- 类型:收发器 驱动器/接收器数:2/2 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-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| ADM2483 | 制造商:AD 制造商全称:Analog Devices 功能描述:Half-Duplex iCoupler-R Isolated RS-485 Transceiver |
| ADM2483BRW | 功能描述:IC TXRX RS-485 ISOLATED 16-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:iCoupler® 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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