RS-485 Transceivers. ADM2482E Datasheet

ADM2482E Transceivers. Datasheet pdf. Equivalent

ADM2482E Datasheet
Recommendation ADM2482E Datasheet
Part ADM2482E
Description 2.5 kV Isolated RS-485 Transceivers
Feature ADM2482E; 2.5 kV Isolated RS-485 Transceivers with Integrated Transformer Driver ADM2482E/ADM2487E FEATURES I.
Manufacture Analog Devices
Datasheet
Download ADM2482E Datasheet




Analog Devices ADM2482E
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.



Analog Devices ADM2482E
ADM2482E/ADM2487E
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Timing Specifications .................................................................. 4 
Package Characteristics ............................................................... 5 
Regulatory Information............................................................... 5 
Insulation and Safety-Related Specifications............................ 5 
VDE 0884-2 Insulation Characteristics..................................... 6 
Absolute Maximum Ratings............................................................ 7 
ESD Caution.................................................................................. 7 
Pin Configuration and Function Descriptions............................. 8 
Typical Performance Characteristics ............................................. 9 
REVISION HISTORY
2/09—Rev. 0 to Rev. A
Edits to Features................................................................................ 1
Added Table 5.................................................................................... 5
Changes to Table 6............................................................................ 5
Added Table 7.................................................................................... 6
Changes to Figure 9........................................................................ 13
Added Table 13 ............................................................................... 16
Changes to Ordering Guide .......................................................... 18
5/08—Revision 0: Initial Version
Test Circuits..................................................................................... 12 
Switching Characteristics .............................................................. 13 
Circuit Description......................................................................... 14 
Electrical Isolation...................................................................... 14 
Truth Tables................................................................................. 14 
Thermal Shutdown .................................................................... 15 
True Fail-Safe Receiver Inputs .................................................. 15 
Magnetic Field Immunity.......................................................... 15 
Applications Information .............................................................. 16 
Printed Circuit Board Layout ................................................... 16 
Transformer Suppliers ............................................................... 16 
Isolated Power Supply Circuit .................................................. 16 
Typical Applications................................................................... 17 
Outline Dimensions ....................................................................... 18 
Ordering Guide .......................................................................... 18 
Rev. A | Page 2 of 20



Analog Devices ADM2482E
ADM2482E/ADM2487E
SPECIFICATIONS
Each voltage is relative to its respective ground; 3.0 V ≤ VDD1 ≤ 5.5 V, 3.0 V ≤ VDD2 ≤ 3.6 V. All minimum/maximum specifications apply
over the entire recommended operation range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = 5 V, VDD2 = 3.3 V,
unless otherwise noted.
Table 1.
Parameter
SUPPLY CURRENT
Power Supply Current, Logic Side
TxD/RxD Data Rate < 500 kbps
ADM2487E TxD/RxD Data Rate = 500 kbps
ADM2482E TxD/RxD Data Rate = 16 Mbps
Power Supply Current, Bus Side
TxD/RxD Data Rate < 500 kbps
ADM2487E TxD/RxD Data Rate = 500 kbps
ADM2482E TxD/RxD Data Rate = 16 Mbps
DRIVER
Differential Outputs
Differential Output Voltage, Loaded
∆|VOD| for Complementary Output States
Common-Mode Output Voltage
∆|VOC| for Complementary Output States
Short-Circuit Output Current
Output Leakage Current (Y, Z)
Logic Inputs
Input Threshold Low
Input Threshold High
Input Current
RECEIVER
Differential Inputs
Differential Input Threshold Voltage
Input Voltage Hysteresis
Input Current (A, B)
Line Input Resistance
Logic Outputs
Output Voltage Low
Output Voltage High
Short-Circuit Current
Tristate Output Leakage Current
Symbol Min
IDD1
IDD2
Typ Max Unit Test Conditions
3.5 mA Unloaded output
4 mA Half-duplex configuration,
RTERMINATION = 120 Ω, see Figure 25
6.0 mA Half-duplex configuration,
RTERMINATION = 120 Ω, see Figure 25
17 mA Unloaded output
40 mA VDD2 = 3.6 V, half-duplex
configuration, RTERMINATION = 120 Ω,
see Figure 25
50 mA VDD2 = 3.6 V, half-duplex
configuration, RTERMINATION = 120 Ω,
see Figure 25
|VOD2|
|VOD3|
∆|VOD|
VOC
∆|VOC|
IOS
IO
2.0
1.5
1.5
−100
VIL 0.25 × VDD1
VIH
II −10 +0.01
5.0 V
5.0 V
5.0 V
0.2 V
3.0 V
0.2 V
250 mA
125 μA
μA
0.7 × VDD1
+10
V
V
μA
RL = 100 Ω (RS-422), see Figure 19
RL = 54 Ω (RS-485), see Figure 19
−7 V ≤ VTEST ≤ +12 V, see Figure 20
RL = 54 Ω or 100 Ω, see Figure 19
RL = 54 Ω or 100 Ω, see Figure 19
RL = 54 Ω or 100 Ω, see Figure 19
DE = 0 V, RE = 0 V, VCC = 0 V or
3.6 V, VIN = 12 V
DE = 0 V, RE = 0 V, VCC = 0 V or
3.6 V, VIN = −7 V
DE, RE, TxD
DE, RE, TxD
DE, RE, TxD
VTH
VHYS
II
RIN
VOLRxD
VOHRxD
IOS
IOZR
−200
−125
96
−125
15
−30
125
VDD1 − 0.3
0.2
VDD1 − 0.2
0.4
100
±1
mV −7 V < VCM < +12 V
mV VOC = 0 V
μA DE = 0 V, VDD = 0 V or 3.6 V,
VIN = 12 V
μA DE = 0 V, VDD = 0 V or 3.6 V,
VIN = −7 V
kΩ −7 V < VCM < +12 V
V IORxD = 1.5 mA, VA − VB = −0.2 V
V IORxD = −1.5 mA, VA − VB = 0.2 V
mA
μA VDD1 = 5.0 V, 0 V < VO < VDD1
Rev. A | Page 3 of 20







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