ADM1485ARZ-REEL Analog Devices Inc, ADM1485ARZ-REEL Datasheet

ADM1485ARZ-REEL

Manufacturer Part Number

ADM1485ARZ-REEL

Description

IC,LINE TRANSCEIVER,BICMOS,1 DRIVER,1 RCVR,SOP,8PIN,PLASTIC

Manufacturer

Analog Devices Inc

Type

Transceiverr

Datasheet

1.ADM1485JRZ.pdf (12 pages)

Specifications of ADM1485ARZ-REEL

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)

Data Rate

30Mbps

Interface Circuit Standard 1

RS-485

Number Of Receivers

Number Of Transmitters

Number Of Transceivers

Data Transmission Topology

Multipoint

Receiver Signal Type

Differential

Transmitter Signal Type

Differential

Single Supply Voltage (typ)

Single Supply Voltage (min)

4.75V

Single Supply Voltage (max)

5.25V

Dual Supply Voltage (typ)

Not RequiredV

Dual Supply Voltage (min)

Not RequiredV

Dual Supply Voltage (max)

Not RequiredV

Supply Current

2.2mA

Power Supply Requirement

Single

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

SOIC N

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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GENERAL DESCRIPTION

The ADM1485 is a differential line transceiver suitable for high

speed bidirectional data communication on multipoint bus trans-

mission lines. It is designed for balanced data transmission and

complies with both RS-485 and RS-422 EIA Standards. The part

contains a differential line driver and a differential line receiver.

Both the driver and the receiver may be enabled independently.

When disabled, the outputs are three-stated.

The ADM1485 operates from a single 5 V power supply. Excessive

power dissipation caused by bus contention or by output shorting

is prevented by a thermal shutdown circuit. This feature forces

the driver output into a high impedance state if, during fault condi-

tions, a significant temperature increase is detected in the internal

driver circuitry.

Up to 32 transceivers may be connected simultaneously on a bus,

but only one driver should be enabled at any time. It is important,

therefore, that the remaining disabled drivers do not load the bus.

To ensure this, the ADM1485 driver features high output

impedance when disabled and also when powered down.

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 rights of third parties that

may result from its use. 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.

FEATURES

Meets EIA RS-485 Standard

30 Mbps Data Rate

Single 5 V Supply

–7 V to +12 V Bus Common-Mode Range

High Speed, Low Power BiCMOS

Thermal Shutdown Protection

Short-Circuit Protection

Driver Propagation Delay: 10 ns

Receiver Propagation Delay: 15 ns

High-Z Outputs with Power Off

Superior Upgrade for LTC1485

APPLICATIONS

Low Power RS-485 Systems

DTE-DCE Interface

Packet Switching

Local Area Networks

Data Concentration

Data Multiplexers

Integrated Services Digital Network (ISDN)

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 ADM1485 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 ADM1485 features extremely fast switching speeds. Minimal

driver propagation delays permit transmission at data rates up to

5 Mbps while low skew minimizes EMI interference.

The part is fully specified over the commercial and industrial

temperature range and is available in PDIP, SOIC, and small

MSOP packages.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

FUNCTIONAL BLOCK DIAGRAM

EIA RS-485 Transceiver

ADM1485

8-Lead

5 V Low Power

ADM1485

GND

www.analog.com

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ADM1485ARZ-REEL Summary of contents

Page 1

FEATURES Meets EIA RS-485 Standard 30 Mbps Data Rate Single 5 V Supply – +12 V Bus Common-Mode Range High Speed, Low Power BiCMOS Thermal Shutdown Protection Short-Circuit Protection Driver Propagation Delay Receiver Propagation Delay: ...

Page 2

ADM1485–SPECIFICATIONS Parameter DRIVER Differential Output Voltage OD3 ∆|V | for Complementary Output States OD Common-Mode Output Voltage V OC ∆|V | for Complementary Output States OD Output Short-Circuit Current (V OUT Output Short-Circuit Current (V OUT CMOS ...

Page 3

... ADM1485JR-REEL7 ADM1485AN ADM1485AR ADM1485AR-REEL ADM1485AR-REEL7 ADM1485ARM ADM1485ARM-REEL ADM1485ARM-REEL7 ADM1485ARZ* ADM1485ARZ-REEL ADM1485ARZ-REEL7 ADM1485JCHIPS *Z = lead-free part. –3– ADM1485 Receiver Output. When enabled if A > 200 mV, then RO = High < 200 mV, then RO = Low. Receiver Output Enable. A low level enables the receiver output, RO. A high level places high impedance state. ...

Page 4

ADM1485 Test Circuits V OD Test Circuit 1. Driver Voltage Measurement V OD3 Test Circuit 2. Driver Voltage Measurement A R LDIFF B Test Circuit 3. Driver Propagation Delay Switching Characteristics 3V 1. PLH B 1/2VO V O ...

Page 5

OUTPUT VOLTAGE – V TPC 1. Output Current vs. Receiver Output Low Voltage 0 –2 –4 –6 –8 –10 –12 –14 –16 –18 ...

Page 6

ADM1485 100 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE – V TPC 7. Output Current vs. Driver Output Low Voltage 0 –10 –20 –30 –40 –50 –60 –70 –80 ...

Page 7

TPC 13. Unloaded Driver Differential Outputs 1, 2 TPC 14. Loaded Driver Differential Outputs TPC 15. Driver/Receiver Propagation Delays Low to High REV TPC 16. Driver/Receiver Propagation ...

Page 8

ADM1485 APPLICATION 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 ...

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ADM1485ARZ-REEL Analog Devices Inc, ADM1485ARZ-REEL Datasheet

ADM1485ARZ-REEL

Specifications of ADM1485ARZ-REEL

Available stocks

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ADM1485ARZ-REEL Summary of contents

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