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ADM2487E Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM2487E
Beschreibung 2.5 kV Isolated RS-485 Transceivers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADM2487E Datasheet, Funktion
2.5 kV Isolated RS-485 Transceivers with
Integrated Transformer Driver
ADM2482E/ADM2487E
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
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
FUNCTIONAL BLOCK DIAGRAM
VDD1
D1 D2
VDD2
OSC
DE
Y
TxD
Z
RxD
RE
A
B
GND1
Figure 1.
GND2
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.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. 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.






ADM2487E Datasheet, Funktion
ADM2482E/ADM2487E
VDE 0884-2 INSULATION CHARACTERISTICS
This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by
means of protective circuits. An asterisk (*) on packages denotes DIN V VDE V 0884-10 approval.
Table 7.
Description
CLASSIFICATIONS
Installation Classification per DIN VDE
0110 for Rated
Mains Voltage
≤150 V rms
≤300 V rms
≤400 V rms
Climatic Classification
Pollution Degree
VOLTAGE
Maximum Working Insulation Voltage
Input-to-Output Test Voltage
Method b1
Method a:
After Environmental Tests, Subgroup 1
Method a
After Input and/or Safety Test,
Subgroup 2/3):
Highest Allowable Overvoltage1
SAFETY-LIMITING VALUES2
Case Temperature
Input Current
Output Current
Insulation Resistance at TS3
Conditions
(DIN VDE 0110: 1989-01, see Table 1)
VIORM × 1.875 = VPR, 100% production tested, tm =
1 sec, partial discharge < 5 pC
VIORM × 1.6 = VPR, tm = 60 sec, partial discharge <5 pC
VIORM × 1.2 = VPR, tm = 60 sec, partial discharge <5 pC
Symbol Characteristic Unit
VIORM
VPR
I to IV
I to III
I to II
40/85/21
2
560
1050
896
672
VTR 4000
TS
IS, INPUT
IS, OUTPUT
RS
150
265
335
>109
V peak
V peak
V peak
V peak
V peak
°C
mA
mA
Ω
1 Transient overvoltage, tTR = 10 sec.
2 The safety-limiting value is the maximum value allowed in the event of a failure. See Figure 3 for the thermal derating curve.
3 VIO = 500 V.
Rev. A | Page 6 of 20

6 Page









ADM2487E pdf, datenblatt
ADM2482E/ADM2487E
TEST CIRCUITS
Y
TxD
Z
VOD2
RL
2
RL
2 VOC
Figure 19. Driver Voltage Measurement
TxD
Y
VOD3 60
Z
375
375VTEST
Figure 20. Driver Voltage Measurement
TxD
DE
VOUT
VCC
Y
S1
Z
RL
110
CL
50pF
S2
Figure 22. Driver Enable/Disable
A
B RE
VOUT
CL
Figure 23. Receiver Propagation Delay
TxD
Y
RDIFF
Z
CL
CL
Figure 21. Driver Propagation Delay
VDD1
DE
VDD2
VDD2
+1.5V
–1.5V
S1
RL
RE CL VOUT
VCC
S2
RE IN
Figure 24. Receiver Enable/Disable
Y
TxD Z 120
RxD
RE
A
B
GND1
GND2
Figure 25. Supply Current Measurement Test Circuit
Rev. A | Page 12 of 20

12 Page





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