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參數資料
型號: ADM4850AR
廠商: ANALOG DEVICES INC
元件分類: 通用總線功能
英文描述: 5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
中文描述: LINE TRANSCEIVER, PDSO8
封裝: MS-012AA, SOIC-8
文件頁數: 12/16頁
文件大小: 438K
代理商: ADM4850AR
ADM4850–ADM4857
CIRCUIT DESCRIPTION
The ADM4850–ADM4857 are high speed RS-485/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).
Rev. 0 | Page 12 of 16
SLEW-RATE CONTROL
The ADM4850/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 ADM4851/
ADM4855 offer a higher limit on driver output slew rate, allowing
data transmission rates up to 500 kbps. The driver slew rates of
the ADM4852/ADM4856 and the ADM4853/ADM4857 are not
limited, offering data transmission rates up to 2.5 Mbps and
10 Mbps, respectively.
RECEIVER INPUT FILTERING
The receivers of all the devices incorporate input hysteresis. In
addition, the receivers of the 115 kbps ADM4850/ADM485 and
the 500 kbps ADM4851/ADM4855 incorporate input 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 only do one of these at any given time.
However, with full-duplex operation, the transceiver can
transmit and receive simultaneously. The ADM4850–ADM4853
are half-duplex devices in which the driver and receiver share
differential bus terminals. The ADM4854–ADM4857 are full-
duplex devices, which have dedicated driver output and receiver
input pins. Figure 26
and Figure 27 show typical half- and full-
duplex topologies.
0
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
A
B
R
D
RO
RE DE
DI
A
B
A
A
A
A
ADM4850/ADM4851/
ADM4852/ADM4853
ADM4850/ADM4851/
ADM4852/ADM4853
Figure 26. Typical Half-Duplex RS-485 Network Topology
0
GND
RO
DI
D
R
A
B
Z
RO
DI
D
A
B
Z
Y
R
GND
V
DD
V
DD
Y
ADM4854/ADM4855/
ADM4856/ADM4857
ADM4854/ADM4855/
ADM4856/ADM4857
Figure 27. Typical Full-Duplex Point-to-Point RS-485 Network Topology
相關PDF資料
PDF描述
ADM4850AR-REEL 5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
ADM4850AR-REEL7 5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
ADM4851 5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
ADM4851ACP-REEL 5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
ADM4851ACP-REEL7 ECONOLINE: REC3-S_DR/H1 - 3W DIP Package- 1kVDC Isolation- Regulated Output- UL94V-0 Package Material- Continuous Short Circiut Protection- Internal SMD design- 100% Burned In- Efficiency to 75%
相關代理商/技術參數
參數描述
ADM4850ARMZ 功能描述:IC TXRX RS485/422 115KBPS 8MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器,接收器,收發器 系列:- 標準包裝:121 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS422,RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN(3x3) 包裝:管件
ADM4850ARMZ-REEL7 功能描述:IC TXRX RS485/422 115KBPS 8-MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器,接收器,收發器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS422,RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:通孔 封裝/外殼:8-DIP(0.300",7.62mm) 供應商設備封裝:8-PDIP 包裝:管件 產品目錄頁面:1402 (CN2011-ZH PDF)
ADM4850AR-REEL 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V Slew-Rate Limited Half- and Full-Duplex RS-485/RS-422 Transceivers
ADM4850AR-REEL7 制造商:Analog Devices 功能描述:115KBPS HALF DUPLEX 5V RS485 TRANS. I.C. - Tape and Reel
ADM4850ARZ 功能描述:IC TXRX RS485/422 115KBPS 8-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器,接收器,收發器 系列:- 標準包裝:98 系列:*
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