B
B
3.3 V, 15 kV ESD-Protected, Half- and
Full-Duplex, RS-485/RS-422 Transceivers
ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E
FEATURES FUNCTIONAL BLOCK DIAGRAMS
V
CC
TIA/EIA RS-485/RS-422 compliant
15 kV ESD protection on RS-485 input/output pins
ADM3070E/
ADM3073E/
Data rates
ADM3076E
ADM3070E/ADM3071E/ADM3072E: 250 kbps
A
RO R
ADM3073E/ADM3074E/ADM3075E: 500 kbps
RE
ADM3076E/ADM3077E/ADM3078E: 16 Mbps
DE
Half- and full-duplex options
Z
True fail-safe receiver inputs
DI D
Y
Up to 256 nodes on the bus
40C to +125C temperature option
GND
RE
Hot-swap input structure on DE and pins
Figure 1.
Reduced slew rates for low EMI
V
CC
Low power shutdown current (all except ADM3071E/
ADM3074E/ADM3077E)
ADM3071E/
ADM3074E/
Outputs high-Z when disabled or powered off
ADM3077E
Common-mode input range: 7 V to +12 V
A
RO R
Thermal shutdown and short-circuit protection
8-lead and 14-lead narrow SOIC packages
APPLICATIONS
Z
DI D
Y
Power/energy metering
Industrial control
GND
Lighting systems
Figure 2.
Telecommunications
Security systems V
CC
Instrumentation
ADM3072E/
ADM3075E/
GENERAL DESCRIPTION ADM3078E
The ADM307xE are 3.3 V, low power data transceivers with
R
RO
15 kV ESD protection suitable for full- and half-duplex
RE
A
communication on multipoint bus transmission lines. They
DE
B
are designed for balanced data transmission, and they comply
DI D
with TIA/EIA standards: RS-485 and RS-422.
The devices have a unit load receiver input impedance, which
GND
allows up to 256 transceivers on a bus. Because only one driver
Figure 3.
should be enabled at any time, the output of a disabled or powered-
down driver is tristated to avoid overloading the bus.
The receiver inputs have a true fail-safe feature, which eliminates
the need for external bias resistors and ensures a logic high
output level when the inputs are open or shorted. This guar-
antees that the receiver outputs are in a known state before
communication begins and when communication ceases.
Rev. E
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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
rights of third parties that may result from its use. Specifications subject to change without notice. No
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license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Fax: 781.461.3113 20062009 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the property of their respective owners.
06285-003 06285-001
06285-002ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E
TABLE OF CONTENTS
Typical Performance Characteristics ........................................... 12
Features .............................................................................................. 1
Circuit Description......................................................................... 15
Applications ....................................................................................... 1
Function Tables ........................................................................... 15
General Description ......................................................................... 1
Receiver Fail-Safe ....................................................................... 15
Functional Block Diagrams ............................................................. 1
Hot-Swap Capability .................................................................. 16
Revision History ............................................................................... 2
Line Length vs. Data Rate ......................................................... 16
Specif icat ions ..................................................................................... 4
15 kV ESD Protection ............................................................. 16
Timing Specifications
ADM3070E/ADM3071E/ADM3072E ....................................... 5 Human Body Model .................................................................. 16
Timing Specifications 256 Transceivers on the Bus ...................................................... 16
ADM3073E/ADM3074E/ADM3075E ....................................... 6
Reduced EMI and Reflections .................................................. 16
Timing Specifications
Low Power Shutdown Mode ..................................................... 17
ADM3076E/ADM3077E/ADM3078E ....................................... 7
Driver Output Protection .......................................................... 17
Absolute Maximum Ratings ............................................................ 8
Typical Applications ................................................................... 17
ESD Caution .................................................................................. 8
Outline Dimensions ....................................................................... 19
Pin Configurations and Function Descriptions ........................... 9
Ordering Guide .......................................................................... 20
Test Circuits and Switching Characteristics ................................ 10
REVISION HISTORY
8/09Rev. D to Rev. E
Changes to Ordering Guide .......................................................... 20
4/09Rev. C to Rev. D
Changes to Ordering Guide .......................................................... 20
1/09Rev. B to Rev. C
Changes to Ordering Guide .......................................................... 20
8/08Rev. A to Rev. B
Changes to Table 3 ............................................................................ 5
Changes to Figure 36 ...................................................................... 18
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
10/06Rev. 0 to Rev. A
Added ADM3077E and ADM3078E ............................... Universal
Changes to Figure 2 and Figure 3 ................................................... 1
Changes to Figure 5 and Figure 6 ................................................... 9
Changes to Figure 34 and Figure 35 ............................................. 17
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
8/06Revision 0: Initial Version
Rev. E | Page 2 of 20