ADM2483BRWZ Analog Devices Inc, ADM2483BRWZ Datasheet

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ADM2483BRWZ

Manufacturer Part Number
ADM2483BRWZ
Description
IC TXRX RS485 ISOLATED 16SOIC
Manufacturer
Analog Devices Inc
Series
iCoupler®r
Datasheet

Specifications of ADM2483BRWZ

Inputs - Side 1/side 2
RS-485
Number Of Channels
1
Isolation Rating
2500Vrms
Voltage - Supply
4.75 V ~ 5.25 V
Data Rate
500kbps
Propagation Delay
620ns
Output Type
Logic
Package / Case
16-SOIC (0.300", 7.5mm Width)
Operating Temperature
-40°C ~ 85°C
Device Type
Differential Transceiver
Ic Interface Type
RS485
No. Of Drivers
2
Supply Voltage Range
2.7V To 5.5V
Driver Case Style
SOIC
No. Of Pins
16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ADM2483BRWZ
Manufacturer:
ADI
Quantity:
500
Price:
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ADM2483BRWZ-REEL
Manufacturer:
Analog Devices Inc.
Quantity:
800
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Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
ADM2483BRWZ-REEL7
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FEATURES
RS-485 transceiver with electrical data isolation
Complies with ANSI TIA/EIA RS-485-A and ISO 8482: 1987(E)
500 kbps data rate
Slew rate-limited driver outputs
Low power operation: 2.5 mA max
Suitable for 5 V or 3 V operations (V
High common-mode transient immunity: >25 kV/μs
True fail-safe receiver inputs
Chatter-free power-up/power-down protection
256 nodes on bus
Thermal shutdown protection
Safety and regulatory approvals
V
Operating temperature range: −40°C to +85°C
APPLICATIONS
Low power RS-485/RS-422 networks
Isolated interfaces
Building control networks
Multipoint data transmission systems
GENERAL DESCRIPTION
The ADM2483 differential bus transceiver is an integrated,
galvanically isolated component designed for bidirectional data
communication on balanced, multipoint bus transmission lines.
It complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E).
Using Analog Devices’ iCoupler technology, the ADM2483
combines a 3-channel isolator, a three-state differential line
driver, and a differential input receiver into a single package.
The logic side of the device is powered with either a 5 V or 3 V
supply, and the bus side uses a 5 V supply only.
The ADM2483 is slew-limited to reduce reflections with
improperly terminated transmission lines. The controlled slew
rate limits the data rate to 500 kbps. The device’s input impedance
is 96 kΩ, allowing up to 256 transceivers on the bus. Its driver
has an active-high enable feature. The driver differential outputs
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.
IORM
UL recognition: 2500 V
CSA Component Acceptance Notice #5A
VDE Certificate of Conformity
DIN EN 60747-5-2 (VDE 0884 Rev. 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
= 560 V peak
rms
for 1 minute per UL 1577
DD1
)
and receiver differential inputs are connected internally to form
a differential I/O port. When the driver is disabled or when
V
An active-high receiver disable feature, which causes the receive
output to enter a high impedance state, is provided as well.
The receiver inputs have a true fail-safe feature that ensures a
logic-high receiver output level when the inputs are open or
shorted. This guarantees that the receiver outputs are in a
known state before communication begins and at the point
when communication ends.
Current limiting and thermal shutdown features protect against
output short circuits and bus contention situations that might
cause excessive power dissipation. The part is fully specified
over the industrial temperature range and is available in a
16-lead, wide body SOIC package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
DD1
or V
Isolated RS-485 Transceiver
DD2
RxD
TxD
DE
PV
RE
FUNCTIONAL BLOCK DIAGRAM
= 0 V, this imposes minimal loading on the bus.
Half-Duplex, iCoupler
© 2005 Analog Devices, Inc. All rights reserved.
GND
V
DD1
1
Figure 1.
ADM2483
GND
V
DD2
2
ADM2483
www.analog.com
A
B
®

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ADM2483BRWZ Summary of contents

Page 1

FEATURES RS-485 transceiver with electrical data isolation Complies with ANSI TIA/EIA RS-485-A and ISO 8482: 1987(E) 500 kbps data rate Slew rate-limited driver outputs Low power operation: 2.5 mA max Suitable for operations (V DD1 ...

Page 2

ADM2483 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Specifications....................................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Package Characteristics ............................................................... 6 Regulatory Information............................................................... 6 Insulation and Safety-Related Specifications............................ 6 VDE 0884 Insulation Characteristics ........................................ 7 Pin Configuration and Function Descriptions............................. 8 ...

Page 3

SPECIFICATIONS 2.7 ≤ V ≤ 5.5 V, 4.75 V ≤ V ≤ 5. DD1 DD2 Table 1. Parameter DRIVER Differential Outputs Differential Output Voltage ∆ for Complementary Output States OD Common-Mode Output Voltage, V ...

Page 4

ADM2483 TIMING SPECIFICATIONS 2.7 ≤ V ≤ 5.5 V, 4.75 V ≤ V ≤ 5. DD1 DD2 Table 2. Parameter Min DRIVER Maximum Data Rate 500 Propagation Delay 250 PLH PHL Skew, t SKEW Rise/Fall ...

Page 5

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. All voltages are relative to A their respective ground. Table 3. Parameter V DD1 V DD2 Digital Input Voltage (DE, RE, TxD) Digital Output Voltage RxD Driver Output/Receiver Input Voltage ESD ...

Page 6

ADM2483 PACKAGE CHARACTERISTICS Table 4. Parameter 1 Resistance (Input-Output) 1 Capacitance (Input-Output) 2 Input Capacitance Input IC Junction-to-Case Thermal Resistance Output IC Junction-to-Case Thermal Resistance 1 Device considered a 2-terminal device: Pins and ...

Page 7

VDE 0884 INSULATION CHARACTERISTICS This isolator is suitable for basic electrical isolation only within this safety limit data. Maintenance of this safety data shall be ensured by means of protective circuits. An asterisk (*) on the physical package denotes VDE ...

Page 8

ADM2483 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 8. Pin Function Descriptions Pin No. Mnemonic 1 V DD1 2, 8 GND 1 3 RxD TxD GND 2 10, 11 ...

Page 9

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

Page 10

ADM2483 SWITCHING CHARACTERISTICS V DD1 0.5V 0.5V DD1 0V t PLH B 1/2VO – SKEW PLH PHL V OH 90% POINT A, B 10% POINT Figure 9. Driver Propagation ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS 1.6 I _RCVR_ENABLE @ 5.5V DD1 1.4 1.2 1.0 0.8 I _DE_ENABLE @ 5.5V DD2 0.6 0.4 0.2 0 –40 25 TEMPERATURE (°C) Figure 13. Unloaded Supply Current vs. Temperature 120 100 ...

Page 12

ADM2483 460 t @ P_BLH 5.0V DD1 DD2 440 t @ P_AHL DD1 420 400 t @ P_BHL 5.0V DD1 DD2 380 t P_ALH V DD1 360 340 –40 ...

Page 13

BUS SIDE 200 150 LOGIC SIDE 100 100 CASE TEMPERATURE (°C) Figure 23. Thermal Derating Curve, Dependence of Safety-Limiting Values with Case Temperature per VDE 0884 0 –5 –10 –15 –20 –25 –30 ...

Page 14

ADM2483 CIRCUIT DESCRIPTION ELECTRICAL ISOLATION In the ADM2483, electrical isolation is implemented on the logic side of the interface. Therefore, the part has two main sections: a digital isolation section and a transceiver section (see Figure 26). Driver input and ...

Page 15

TRUTH TABLES The following truth tables use these abbreviations: Letter Description H High level L Low level X Irrelevant Z High impedance (off) NC Disconnected Table 9. Transmitting Supply Status Inputs TxD DD1 DD2 ...

Page 16

ADM2483 Given the geometry of the receiving coil and an imposed requirement that the induced voltage is, at most, 50% of the 0.5 V margin at the decoder, a maximum allowable magnetic field is calculated, as shown in Figure 27. ...

Page 17

APPLICATIONS INFORMATION POWER_VALID INPUT To avoid chatter on the A and B outputs caused by slow power- up and power-down transients on V DD1 ADM2483 features a power_valid (PV) digital input. This pin should be driven low until V exceeds ...

Page 18

... COPLANARITY ORDERING GUIDE Model Data Rate (kbps) ADM2483BRW 500 ADM2483BRW-REEL 1 500 2 ADM2483BRWZ 500 1, 2 ADM2483BRWZ-REEL 500 1 A -REEL suffix designates a 13-inch (1,000 units) tape-and-reel option Pb-free part. 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913) 10.65 (0.4193 ...

Page 19

NOTES Rev Page ADM2483 ...

Page 20

ADM2483 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04736–0–3/05(B) Rev Page ...

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