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Description
1/1 Transceiver Half RS422, RS485 8-SOIC
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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: 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)
GENERAL DESCRIPTION The is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission 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 conditions, a significant temperature increase is detected in the internal driver circuitry.
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.
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 +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 typical data rates
The part is fully specified over the commercial and industrial temperature range and is available in PDIP, SOIC, and small MSOP packages.
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.
Fax: © 2012 Analog Devices, Inc. All rights reserved.VOD3 |VOD| for Complementary Output States Common-Mode Output Voltage VOC |VOD| for Complementary Output States Output Short-Circuit Current (VOUT = High) Output Short-Circuit Current (VOUT = Low) CMOS Input Logic Threshold Low, VINL CMOS Input Logic Threshold High, VINH Logic Input Current (DE, DI)
RECEIVER Differential Input Threshold Voltage, VTH Input Voltage Hysteresis, VTH Input Resistance Input Current (A, B)
CMOS Input Logic Threshold Low, VINL CMOS Input Logic Threshold High, VINH Logic Enable Input Current (RE) CMOS Output Voltage Low, VOL CMOS Output Voltage High, VOH Short-Circuit Output Current Three-State Output Leakage Current
POWER SUPPLY CURRENT ICC (Outputs Enabled) ICC (Outputs Disabled)Test Circuit 1 V VCC 50 (RS-422), Test Circuit 27 (RS-485), Test Circuit 1 V VTST +12 V, Test Circuit 50 , Test Circuit 50 , Test Circuit VO +12
TIMING SPECIFICATIONS (VCC V 5%. All specifications TMIN to TMAX, unless otherwise noted.)DRIVER Propagation Delay Input to Output tPLH, tPHL 2 Driver O/P to O/P tSKEW Driver Rise/Fall Time tR, tF Driver Enable to Output Valid Driver Disable Timing Matched Enable Switching |tAZH tBZL|, |tBZH tAZL| Matched Disable Switching |tAHZ tBLZ|, |tBHZ tALZ|
RECEIVER Propagation Delay Input to Output tPLH, tPHL 8 Skew |tPLH tPHL| Receiver Enable tEN1 Receiver Disable tEN2 Tx Pulse Width Distortion Rx Pulse Width Distortion
ns RLDIFF = 100 pF, Test Circuit 3 ns RLDIFF = 100 pF, Test Circuit 3 ns RLDIFF = 100 pF, Test Circuit = 50 pF, Test Circuit = 50 pF, Test Circuit = 50 pF, Test Circuit 4*
= 15 pF, Test Circuit = 15 pF, Test Circuit = 15 pF, 1 k, Test Circuit = 15 pF, 1 k, Test Circuit 6 ns
*Guaranteed by characterization. Specifications subject to change without notice.Driver Input V to VCC 0.3 V Control Inputs (DE, V to VCC 0.3 V Receiver Inputs (A, B). +14 V Outputs Driver Outputs (A, B). +14 V Receiver V to VCC 0.5 V Power Dissipation 8-Lead MSOP. 900 mW JA, Thermal Impedance. 206°C/W Power Dissipation 8-Lead PDIP. 500 mW JA, Thermal Impedance. 130°C/W Power Dissipation 8-Lead SOIC. 450 mW JA, Thermal Impedance. 170°C/W Operating Temperature Range Commercial (J Version). to 70°C Industrial (A Version). to +85°C Storage Temperature Range. to +150°C Lead Temperature (Soldering, 10 sec). 300°C Vapor Phase (60 sec). 215°C Infrared (15 sec). 220°C
*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum ratings for extended periods of time may affect device reliability.
Receiver Output. When enabled by 200 mV, then RO = High. by 200 mV, then RO = Low.Receiver Output Enable. A low level enables the receiver output, RO. A high level places in a high impedance state.
Driver Output Enable. A high level enables the driver differential outputs, A and B. A low level places in a high impedance state.
Driver Input. When the driver is enabled, a logic low on DI forces A low and B high while a logic high on DI forces A high and B low.
Inverting Receiver Input B/Driver Output B Power Supply, ± 5%.CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM1485 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
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The testing results for the Intergrated Circuits ADM1485ARZ-REEL ordered from Utsource website were satisfactory. The device was tested for function, power consumption, and temperature. The device was found to be functioning properly, with power consumption within the specified range, and temperature within the specified range. The device was also tested for electrical parameters such as voltage a
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03/17/2023
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ADM1485ARZ-REEL
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