ADM1486AR-REEL7 Analog Devices Inc, ADM1486AR-REEL7 Datasheet

IC TXRX RS-485 PRO-BUS 5V 8SOIC

ADM1486AR-REEL7

Manufacturer Part Number
ADM1486AR-REEL7
Description
IC TXRX RS-485 PRO-BUS 5V 8SOIC
Manufacturer
Analog Devices Inc
Type
Transceiverr
Datasheet

Specifications of ADM1486AR-REEL7

Rohs Status
RoHS non-compliant
Number Of Drivers/receivers
1/1
Protocol
RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
FEATURES
Meets and exceeds EIA RS-485 and EIA RS-422 standards
30 Mbps data rate
Recommended for PROFIBUS applications
2.1 V minimum differential output with 54 Ω termination
Low power 0.8 mA I
Thermal shutdown and short-circuit protection
0.5 ns skew driver and receiver
Driver propagation delay: 11 ns
Receiver propagation delay: 12 ns
High impedance outputs with drivers disabled or power off
Superior upgrade for SN65ALS1176
Available in standard 8-lead SOIC package
APPLICATIONS
Industrial field equipment
GENERAL DESCRIPTION
The ADM1486 is a differential line transceiver suitable for high
speed bidirectional data communication on multipoint bus
transmission lines. It is designed for balanced data transmission,
complies with EIA Standards RS-485 and RS-422, and is recom-
mended for PROFIBUS applications. The part contains a
differential line driver and a differential line receiver. Both the
driver and the receiver may be enabled independently. When
disabled or powered down, the driver outputs are high impedance.
The ADM1486 operates from a single 5 V power supply.
Excessive power dissipation caused by bus contention or output
shorting is prevented by short-circuit protection and thermal
circuitry. Short-circuit protection circuits limit the maximum
output current to ±200 mA during fault conditions. A thermal
shutdown circuit senses if the die temperature rises above
150°C and forces the driver outputs into a high impedance state
under this condition.
Up to 50 transceivers may be connected simultaneously on a
bus, but only one driver should be enabled at a time. Therefore,
it is important that the remaining disabled drivers do not load
the bus.
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. Trademarks and
registered trademarks are the property of their respective owners.
CC
To ensure this, the ADM1486 driver features high output
impedance when disabled and when powered down. This
minimizes the loading effect when the transceiver is not being
used. The high impedance driver output is maintained over the
entire common-mode voltage range from −7 V to +12 V.
The receiver contains a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM1486 is fabricated on BiCMOS, an advanced mixed
technology process combining low power CMOS with fast
switching bipolar technology. All inputs and outputs contain
protection against ESD; all driver outputs feature high source
and sink current capability. An epitaxial layer is used to guard
against latch-up.
The ADM1486 features extremely fast and closely matched
switching, enable, and disable times. Minimal driver propaga-
tion delays permit transmission at data rates up to 30 Mbps
while low skew minimizes EMI interference.
The part is fully specified over the commercial and industrial
temperature range and is available in an 8-lead SOIC package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
FUNCTIONAL BLOCK DIAGRAM
RO
RE
DE
DI
1
2
3
4
ADM1486
5 V, 0.8 mA PROFIBUS
© 2005 Analog Devices, Inc. All rights reserved.
RS-485 Transceiver
D
Figure 1.
R
ADM1486
8
7
6
5
www.analog.com
V
B
A
GND
CC

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ADM1486AR-REEL7 Summary of contents

Page 1

FEATURES Meets and exceeds EIA RS-485 and EIA RS-422 standards 30 Mbps data rate Recommended for PROFIBUS applications 2.1 V minimum differential output with 54 Ω termination Low power 0 Thermal shutdown and short-circuit protection 0.5 ns ...

Page 2

ADM1486 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Specifications....................................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Test Circuits....................................................................................... 7 Switching Characteristics ................................................................ 8 Typical Performance Characteristics ............................................. 9 REVISION HISTORY 3/05—Rev Rev. ...

Page 3

SPECIFICATIONS ±5%. All specifications MIN Table 1. Parameter DRIVER Differential Output Voltage OD3 ∆ for Complementary Output States OD Common-Mode Output Voltage V OC ∆ ...

Page 4

ADM1486 TIMING SPECIFICATIONS ±5%. All specifications MIN Table 2. Parameter DRIVER Propagation Delay Input to Output t PLH Driver O/P to O/P t SKEW Driver Rise/Fall Time ...

Page 5

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V CC Inputs Driver Input (DI) Control Inputs (DE Receiver Inputs (A, B) Outputs Driver Outputs Receiver Outputs Power Dissipation 8-Lead SOIC θ , Thermal ...

Page 6

ADM1486 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 RO Receiver Output. When enabled > 200 mV high < 200 mV ...

Page 7

TEST CIRCUITS Figure 3. Driver Voltage Measurement 375Ω 60Ω OD3 B 375Ω Figure 4. Driver Voltage Measurement A R LDIFF B Figure 5. Driver Propagation Delay ...

Page 8

ADM1486 SWITCHING CHARACTERISTICS 3V 1. PLH B 1/2VO – t SKEW PLH PHL 90% POINT VO 0V 10% POINT – Figure 9. Driver Propagation Delay, Rise/Fall Timing DE 1. ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS 0.25 0.50 0.75 1.00 OUTPUT VOLTAGE (V) Figure 13. Output Current vs. Receiver Output Low Voltage 0 –5 –10 –15 –20 –25 –30 3.50 3.75 4.00 4.25 OUTPUT ...

Page 10

ADM1486 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) Figure 19. Output Current vs. Driver Output Low Voltage 0 –10 –20 –30 –40 –50 –60 –70 –80 0 0.5 1.0 1.5 ...

Page 11

CH1 1.00VΩ CH2 1.00VΩ M4.00ns Figure 25. Unloaded Driver Differential Outputs 1, 2 CH1 500mVΩ CH2 500mVΩ M4.00ns CH1 Figure 26. Loaded Driver Differential Output (R Diff = 54 Ω 100 pF ...

Page 12

ADM1486 1, 2 CH1 1.00VΩ CH2 1.00VΩ M4.00ns Figure 31. Loaded Driver Outputs at 15 Mbps ( Ω 100 pF) LDIFF CH1 3.40V Rev Page 12 ...

Page 13

APPLICATIONS INFORMATION DIFFERENTIAL DATA TRANSMISSION Differential data transmission is used to reliably transmit data at high rates over long distances and through noisy environments. Differential transmission nullifies the effects of ground shifts and noise signals that appear as common-mode voltages ...

Page 14

ADM1486 Table 7. Comparison of RS-422, RS-485, and PROFIBUS Interface Standards Specification Transmission Type Maximum Cable Length Minimum Driver Output Voltage Driver Load Impedance Receiver Input Resistance Receiver Input Sensitivity Receiver Input Voltage Range No. of Drivers/Receivers per Line RS-422 ...

Page 15

... OUTLINE DIMENSIONS ORDERING GUIDE Model Temperature Range ADM1486AR −40°C to +85°C ADM1486AR-REEL −40°C to +85°C ADM1486AR-REEL7 −40°C to +85°C 1 ADM1486ARZ −40°C to +85°C 1 ADM1486ARZ-REEL −40°C to +85°C 1 ADM1486ARZ-REEL7 −40°C to +85° Pb-free part. 5.00 (0.1968) 4 ...

Page 16

ADM1486 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02603-0-3/05(A) Rev Page ...

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