adm3485 Analog Devices, Inc., adm3485 Datasheet

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adm3485

Manufacturer Part Number
adm3485
Description
3.3 V Slew Rate Limited, Half- And Full-duplex, Rs-485/rs-422 Transceivers
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
Operate with 3.3 V supply
Interoperable with 5 V logic
EIA RS-422 and RS-485 compliant over full
Data rate options
Half- and full-duplex options
Reduced slew rates for low EMI (ADM3483 and ADM3488)
2 nA supply current in shutdown mode
Up to 32 transceivers on the bus
−7 V to +12 V bus common-mode range
Specified over the –40°C to +85°C temperature range
8 ns skew (ADM3485/ADM3490/ADM3491)
8-lead SOIC and 14-lead SOIC (ADM3491 only) packages
APPLICATIONS
Low power RS-485/RS-422 applications
Telecom
Industrial process control
HVAC
GENERAL DESCRIPTION
The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are
low power, differential line transceivers designed to operate using a
single 3.3 V power supply. Low power consumption, coupled with a
shutdown mode, makes the ADM3483/ADM3485/ADM3488/
ADM3490/ADM3491 ideal for power-sensitive applications.
The ADM3488/ADM3490/ADM3491 feature full-duplex com-
munication, while the ADM3483/ADM3485 are designed for
half-duplex communication.
The ADM3483/ADM3488 feature slew rate limited drivers that
minimize EMI and reduce reflections caused by improperly ter-
minated cables, allowing error-free data transmission at data rates
up to 250 kbps.
The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps.
The receiver input impedance is 12 kΩ, allowing up to 32 trans-
ceivers to be connected on the bus. A thermal shutdown circuit
prevents excessive power dissipation caused by bus contention or
by output shorting. If a significant temperature increase is detected
Rev. B
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.
Trademarks and registered trademarks are the property of their respective owners.
common-mode range
ADM3483/ADM3488: 250 kbps
ADM3485/ADM3490/ADM3491: 10 Mbps
(ADM3483/ADM3485/ADM3491)
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Full-Duplex, RS-485/RS-422 Transceivers
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
in the internal driver circuitry during fault conditions, then the
thermal shutdown circuit forces the driver output into a high
impedance state. If the inputs are unconnected (floating), the
receiver contains a fail-safe feature that results in a logic high
output state. The parts are fully specified over the commercial
and industrial temperature ranges. The ADM3483/ADM3485/
ADM3488/ADM3490 are available in 8-lead SOIC_N; the
ADM3491 is available in a 14-lead SOIC_N.
3.3 V Slew Rate Limited, Half- and
FUNCTIONAL BLOCK DIAGRAMS
RO
DE
RO
RO
DE
RE
RE
DI
DI
DI
©2006 Analog Devices, Inc. All rights reserved.
ADM3488/
ADM3483/
ADM3490
ADM3485
ADM3491
D
D
D
Figure 1.
Figure 2.
Figure 3.
GND
R
R
GND
R
V
V
CC
CC
A
B
A
B
A
B
Z
Y
Z
Y
www.analog.com

Related parts for adm3485

adm3485 Summary of contents

Page 1

... EMI and reduce reflections caused by improperly ter- minated cables, allowing error-free data transmission at data rates up to 250 kbps. The ADM3485/ADM3490/ADM3491 transmit Mbps. The receiver input impedance is 12 kΩ, allowing trans- ceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting ...

Page 2

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 4 Timing Specifications—ADM3485/ADM3490/ADM3491.... 5 Timing Specifications—ADM3483/ADM3488........................ 5 Timing Specifications—ADM3483/ADM3485/ADM3488/ ADM3490/ADM3491 .................................................................. 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Test Circuits....................................................................................... 9 Switching Characteristics .............................................................. 11 REVISION HISTORY 10/06—Rev Rev. B Updated Format ...

Page 3

... Table 1. ADM34xx Part Comparison Guaranteed Data Supply Part No. Rate (Mbps) Voltage (V) ADM3483 0.25 3.0 to 3.6 ADM3485 10 3.0 to 3.6 ADM3488 0.25 3.0 to 3.6 ADM3490 10 3.0 to 3.6 ADM3491 10 3.0 to 3.6 ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 Half-/Full- Slew Rate Driver/Receiver Duplex Limited Enable Half Yes Yes Half No Yes Full Yes No Full No No Full No Yes Rev Page ...

Page 4

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 SPECIFICATIONS V = 3.3 V ± 0 unless otherwise noted MIN MAX Table 2. Parameter DRIVER Differential Output Voltage ( Δ for Complementary Output States OD Common-Mode Output Voltage ( Δ for Common-Mode Output Voltage OC DRIVER INPUT LOGIC CMOS Input Logic Threshold Low (V ...

Page 5

... Propagation Delay, High-to-Low Level ( – Propagation Delay Skew (t PLH PHL DRIVER OUTPUT ENABLE/DISABLE TIMES (ADM3485/ ADM3491 ONLY) Output Enable Time to Low Level (t PZL Output Enable Time to High Level (t PZH Output Disable Time from High Level (t Output Disable Time from Low Level (t ...

Page 6

... Propagation Delay Skew (t PLH PHL RPDS ADM3485/ADM3490/ADM3491 ADM3483/ADM3488 RECEIVER OUTPUT ENABLE/DISABLE TIMES (ADM3483/ADM3485/ADM3491 ONLY) Output Enable Time to Low Level (t PRZL Output Enable Time to High Level (t PRZH Output Disable Time from High Level (t Output Disable Time from Low Level (t Output Enable Time from Shutdown to ...

Page 7

... SOIC 14-Lead SOIC Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 Stresses above those listed under Absolute Maximum Ratings Rating may cause permanent damage to the device. This is a stress 7 V rating only; functional operation of the device at these or any − ...

Page 8

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS ADM3483/ RE ADM3485 TOP VIEW 6 (Not to Scale) DI GND 4 5 Figure 4. ADM3483/ADM3485 Pin Configuration Table 7. Pin Function Descriptions ADM3483/ADM3485 ADM3488/ADM3490 Pin No. Pin No N N N/A N N/A N N/A N ...

Page 9

... 375Ω Figure 8. Differential Output Voltage Drivers with Varying Common-Mode Voltage (+) Figure 9. CMOS Output Voltage High and CMOS Output Voltage Low Receivers ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 –7V TO +12V (–) Rev Page GENERATOR 50Ω ...

Page 10

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 50pF L 1 GENERATOR 50Ω PPR = 250kHz, 50% DUTY CYCLE, ≤ 6.0ns INCLUDES PROBE AND STRAY CAPACITANCE. L Figure 13. Driver Enable and Disable Times ( GENERATOR 50Ω 1. PPR = 250kHz, 50% DUTY CYCLE, ≤ 6.0ns INCLUDES PROBE AND STRAY CAPACITANCE. ...

Page 11

... Figure 16. Driver Differential Output Delay and Transition Times IN 1.5V 1.5V t PLH A OUT t PHL B/Z V OUT OM Figure 17. Driver Propagation Delays IN t PRZH t PRSH OUT 1. PRHZ OUT +0.25V ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 + ≈ +2V 10% ≈ – PHL PLH 1.5V 1 ...

Page 12

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 TYPICAL PERFORMANCE CHARACTERISTICS 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) Figure 22. Output Current vs. Receiver Output Low Voltage –16 –14 –12 –10 –8 –6 –4 – 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) Figure 23. Output Current vs. Receiver Output High Voltage 3.30 3.25 3.20 3.15 3.10 3.05 3.00 –40 –30 –20 – TEMPERATURE (° ...

Page 13

... Figure 28. Output Current vs. Driver Output Low Voltage –125 –115 –105 –95 –85 –75 –65 –55 –45 –35 –25 –15 –5 –7 –6 –5 –4 –3 –2 –1 0 OUTPUT VOLTAGE (V) Figure 29. Output Current vs. Driver Output High Voltage ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0 – ...

Page 14

... The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power transceivers for RS-485 and RS-422 communi- cations. The ADM3483/ADM3488 transmit and receive at data rates up to 250 kbps; the ADM3485/ADM3490/ADM3491 trans- mit Mbps. The ADM3488/ADM3490/ADM3491 are full-duplex transceivers, while the ADM3483/ADM3485 are half- duplex transceivers. Driver enable (DE) and receiver enable ( RE ) pins are included on the ADM3483/ADM3485/ADM3491 ...

Page 15

... NOTES EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE. T ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = Figure 32. ADM3483/ADM3485 Typical Half-Duplex RS-485 Network MAXIMUM NUMBER OF NODES = Figure 33. ADM3491 Typical Full-Duplex RS-485 Network Rev Page ...

Page 16

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 MASTER ADM3488/ ADM3490 ADM3488/ ADM3490 SLAVE Figure 34. ADM3488/ADM3490 Full-Duplex Daisy-Chain Network MASTER ADM3488/ ADM3490 Figure 35. ADM3488/ADM3490 Full-Duplex Point-to-Point Applications ADM3491 DATA ...

Page 17

... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 4.00 (0.1575) 3.80 (0.1496) 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 5.80 (0.2284 1.27 (0.0500) BSC 1 ...

Page 18

... Temperature Range 1 −40°C to +85°C ADM3483ARZ ADM3483ARZ–REEL7 1 −40°C to +85°C 1 −40°C to +85°C ADM3485ARZ 1 −40°C to +85°C ADM3485ARZ–REEL7 1 ADM3488ARZ −40°C to +85°C 1 ADM3488ARZ–REEL7 −40°C to +85°C 1 −40°C to +85°C ADM3490ARZ ADM3490ARZ–REEL7 1 − ...

Page 19

... NOTES ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 Rev Page ...

Page 20

... ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05524-0-10/06(B) Rev Page ...

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