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参数资料
| 型号： | ADM2481BRWZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20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 14 of 20
TRUTH TABLES
The following truth tables use the abbreviations shown in Table 9.
Table 9.
Letter
Description
H
High level
L
Low level
X
Don’t care
Z
High impedance (off)
NC
Disconnected
Table 10. Transmitting
Supply Status
Inputs
Outputs
VDD1
VDD2
DE
TxD
A
B
On
H
L
On
H
L
H
On
L
X
Z
On
Off
X
Z
Off
On
L
Z
Off
X
Z
Table 11. Receiving
Supply Status
Inputs
Outputs
VDD1
VDD2
A B (V)
RE
RxD
On
>0.03
L or NC
H
On
<0.2
L or NC
L
On
0.2 < A B < 0.03
L or NC
Indeterminate
On
Inputs open
L or NC
H
On
X
H
Z
On
Off
X
L or NC
H
Off
X
L or NC
L
THERMAL SHUTDOWN
The ADM2481 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 under this
condition and disables the driver outputs. This 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 a temperature of 140°C.
TRUE FAIL-SAFE RECEIVER INPUTS
The receiver inputs have a true fail-safe feature that ensures that
the receiver output is high when the inputs are open or shorted.
During line-idle conditions, when no driver on the bus is
enabled, the voltage across a terminating resistance at the
receiver input decays to 0 V. With traditional transceivers,
receiver input thresholds specified between 200 mV and
+200 mV mean that external bias resistors are required on the
A and B pins to ensure that the receiver outputs are in a known
state. The true fail-safe receiver input feature eliminates the
need for bias resistors by specifying the receiver input thresh-
old between 30 mV and 200 mV. The guaranteed negative
threshold means that when the voltage between A and B decays
to 0 V, the receiver output is guaranteed to be high.
MAGNETIC FIELD IMMUNITY
Because iCouplers use a coreless technology, no magnetic
components are present, and the problem of magnetic satura-
tion of the core material does not exist. Therefore, iCouplers
have essentially infinite dc field immunity. The analysis that
follows defines the conditions under which this might occur.
The 3 V operating condition of the ADM2481 is examined
because it represents the most susceptible mode of operation.
The limitation on the ac magnetic field immunity of the
i
Coupler is set by the condition in which the induced error
voltage in the receiving coil (the bottom coil in this case) is
made sufficiently large, either to falsely set or reset the decoder.
The voltage induced across the bottom coil is given by
;
π 2n
r
dt
dβ
V
∑
=
N
n
,
...
,
2
,1
=
where, if the pulses at the transformer output are greater than
1.0 V in amplitude:
β is the magnetic flux density (gauss).
N is the number of turns in receiving coil.
rn is the radius of nth turn in receiving coil (cm).
The decoder has a sensing threshold of about 0.5 V; therefore,
there is a 0.5 V margin in which induced voltages can be
tolerated.
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相关代理商/技术参数 |
参数描述 |
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| 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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