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參數(shù)資料
| 型號(hào)： | EVAL-ADM2491EEBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADM2491 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，收發(fā)器，RS-485 |
| 已用 IC / 零件： | ADM2491 |
| 已供物品： | 板 |
High Speed, ESD-Protected, Half-/Full-Duplex
i
Coupler Isolated RS-485 Transceiver
ADM2491E
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2007–2010 Analog Devices, Inc. All rights reserved.
FEATURES
Isolated, RS-485/RS-422 transceiver, configurable as half- or
full-duplex
±8 kV ESD protection on RS-485 input/output pins
16 Mbps data rate
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482: 1987(E)
Suitable for 5 V or 3.3 V operation (V
DD1)
High common-mode transient immunity: >25 kV/μs
Receiver has open-circuit, fail-safe design
32 nodes on the bus
Thermal shutdown protection
Safety and regulatory approvals
UL recognition: 5000 V rms isolation voltage
for 1 minute, per UL 1577
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Reinforced insulation, V
IORM = 848 V peak
Operating temperature range: 40°C to +85°C
Wide body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
INTERBUS
Multipoint data transmission systems
FUNCTIONAL BLOCK DIAGRAM
VDD1
GND1
A
B
VDD2
GND2
Y
Z
TxD
DE
RxD
ADM2491E
06985-
001
GA
LV
ANI
C
I
S
O
L
A
TION
RE
Figure 1.
GENERAL DESCRIPTION
The ADM2491E is an isolated data transceiver with ±8 kV ESD
protection and is suitable for high speed, half- or full-duplex
communication on multipoint transmission lines. For half-
duplex operation, the transmitter outputs and the receiver
inputs share the same transmission line. Transmitter output
Pin Y is linked externally to receiver input Pin A, and transmit-
ter output Pin Z is linked to receiver input Pin B.
The ADM2491E is designed for balanced transmission lines
and complies with ANSI TIA/EIA RS-485-A-1998 and ISO
8482: 1987(E). The device employs Analog Devices, Inc.,
iCoupler technology to combine a 3-channel isolator, a three-
state differential line driver, and a differential input receiver into
a single package.
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to
±8 kV using the human body model (HBM). The logic side of
the device can be powered with either a 5 V or a 3.3 V supply,
whereas the bus side requires an isolated 5 V supply.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations in which
bus contention could cause excessive power dissipation.
The ADM2491E is available in a wide body, 16-lead SOIC package
and operates over the 40°C to +85°C temperature range.
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