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| 型号： | EVAL-ADM2487EEB5Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM2487 |
| 标准包装： | 1 |
| 主要目的： | 接口，收发器，RS-485 |
| 已用 IC / 零件： | ADM2487 |
| 已供物品： | 板 |
2.5 kV Isolated RS-485 Transceivers with
Integrated Transformer Driver
ADM2482E/ADM2487E
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
www.analog.com
Fax: 781.461.3113
2008–2009 Analog Devices, Inc. All rights reserved.
FEATURES
Isolated RS-485/RS-422 transceivers, configurable as half
duplex or full duplex
Integrated oscillator driver for external transformer
±15 kV ESD protection on RS-485 input/output pins
Complies with TIA/EIA-485-A-98 and ISO 8482:1987(E)
Data rate: 500 kbps/16 Mbps
5 V or 3.3 V operation (VDD1)
256 nodes on bus
True fail-safe receiver inputs
Safety and regulatory approvals
UL recognition: 2500 V rms for 1 minute per UL 1577
VDE certificates of conformity
DIN VVDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 560 V peak
Thermal shutdown protection
Operating temperature range: 40°C to +85°C
Wide-body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
Multipoint data transmission systems
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
D1 D2
DE
TxD
RxD
RE
GND1
GND2
Y
Z
A
B
OSC
G
A
LV
A
N
IC
I
S
O
L
A
T
IO
N
07
37
9-
0
01
Figure 1.
GENERAL DESCRIPTION
The ADM2482E/ADM2487E are isolated data transceivers with
±15 kV ESD protection and are suitable for high speed, half-
duplex or full-duplex communication on multipoint transmission
lines. For half-duplex operation, the transmitter outputs and
receiver inputs share the same transmission line. Transmitter
Output Pin Y is linked externally to Receiver Input Pin A, and
Transmitter Output Pin Z to Receiver Input Pin B. The parts are
designed for balanced transmission lines and comply with
TIA/EIA-485-A-98 and ISO 8482:1987(E).
The devices employ the 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. An on-chip oscillator outputs a pair of square
waveforms that drive an external transformer to provide isolated
power. The logic side of the device is powered with either a 5 V
or a 3.3 V supply, and the bus side is powered with an isolated
3.3 V supply.
The ADM2482E/ADM2487E driver has an active high enable,
and the receiver has an active low enable. The driver output
enters a high impedance state when the driver enable signal
is low. The receiver output enters a high impedance state when
the receiver enable signal is high.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations where bus
contention might cause excessive power dissipation. The part is
fully specified over the industrial temperature range of 40°C to
+85°C and is available in a 16-lead, wide-body SOIC package.
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