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参数资料
| 型号： | ADM4857ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/422 10MBPS 8SOIC |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857
Rev. D | Page 13 of 16
CIRCUIT DESCRIPTION
RS-422 transceivers offering enhanced performance over
industry-standard devices. All devices in the family contain
one driver and one receiver, but offer a choice of performance
options. The devices feature true fail-safe operation, which
means that a logic high receiver output is guaranteed when
the receiver inputs are open-circuit or short-circuit, or when
they are connected to a terminated transmission line with all
drivers disabled (see the Fail-Safe Operation section).
SLEW-RATE CONTROL
The ADM4850 and ADM4854 feature a controlled slew-rate
driver that minimizes electromagnetic interference (EMI) and
reduces reflections caused by incorrectly terminated cables,
allowing error-free data transmission rates up to 115 kbps. The
slew rate, allowing data transmission rates up to 500 kbps. The
transmission rates up to 2.5 Mbps and 10 Mbps, respectively.
RECEIVER INPUT FILTERING
The receivers of all the devices incorporate input hysteresis. In
filtering. This enhances noise immunity with differential signals
that have very slow rise and fall times. However, it causes the
propagation delay to increase by 20%.
HALF-/FULL-DUPLEX OPERATION
Half-duplex operation implies that the transceiver can transmit
and receive, but it can do only one of these at any given time. How-
ever, with full-duplex operation, the transceiver can transmit and
ADM4853 are half-duplex devices in which the driver and the
receiver share differential bus terminals. The ADM4854/
have dedicated driver output and receiver input pins. Figure 28
and Figure 29 show typical half- and full-duplex topologies.
04931-026
RO
RE
DE
DI
D
R
A
B
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS: 256
RO
RE
DE
DI
D
R
A
B
R
D
RO RE DE DI
AB
R
D
RO RE DE
DI
AB
ADM4850/ADM4851/
ADM4852/ADM4853
ADM4850/ADM4851/
ADM4852/ADM4853
ADM4850/ADM4851/
ADM4852/ADM4853
ADM4850/ADM4851/
ADM4852/ADM4853
Figure 28. Typical Half-Duplex RS-485 Network Topology
04
93
1-
0
2
7
GND
RO
DI
D
R
A
B
RO
DI
D
A
B
Z
Y
R
GND
VCC
Z
Y
ADM4854/ADM4855/
ADM4856/ADM4857
ADM4854/ADM4855/
ADM4856/ADM4857
Figure 29. Typical Full-Duplex Point-to-Point RS-485 Network Topology
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM485AN | 功能描述:IC TX/RX SINGLE RS-485 5V 8DIP RoHS:否 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 |
| ADM485ANZ | 功能描述:IC TX/RX SINGLE RS-485 5V 8DIP 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:98 系列:* |
| ADM485ANZ | 制造商:Analog Devices 功能描述:RS-485 IC |
| ADM485ANZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Meets EIA RS-485 standard |
| ADM485AQ | 制造商:Rochester Electronics LLC 功能描述:RS-485 I/F TRANSCEIVER - Bulk |
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