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ADM3085 Dataheets PDF



Part Number ADM3085
Manufacturers Analog Devices
Logo Analog Devices
Description (ADM3082 -ADM3089) Transceivers
Datasheet ADM3085 DatasheetADM3085 Datasheet (PDF)

www.DataSheet4U.com PRELIMINARY TECHNICAL DATA a Low-Current (1nA) Shutdown Mode High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and ±15kV ESD Protection ADM3082/ADM3085/ADM3088 GENERAL DESCRIPTION FEATURES Enhanced Slew Rate Limiting for Error-Free Data Transmission Fail-Safe Receiver Operation while Maintaining EIA/TIA-485 compatibility High Input Impedance — Up to 256 Transceivers on Bus ±15kV ESD Protection (Human Body Model) on RS-485 I/O pins Pin-Comp.

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www.DataSheet4U.com PRELIMINARY TECHNICAL DATA a Low-Current (1nA) Shutdown Mode High-Speed (10Mbps), Fail-Safe, RS-485/RS-422 Transceivers with Slew-Rate-Limiting and ±15kV ESD Protection ADM3082/ADM3085/ADM3088 GENERAL DESCRIPTION FEATURES Enhanced Slew Rate Limiting for Error-Free Data Transmission Fail-Safe Receiver Operation while Maintaining EIA/TIA-485 compatibility High Input Impedance — Up to 256 Transceivers on Bus ±15kV ESD Protection (Human Body Model) on RS-485 I/O pins Pin-Compatible with Industry Standard 75176 APPLICATIONS Enhanced Replacement for Industry-Standard Parts EMI-Sensitive Systems Level Translation LANs for Industrial Control Applications The ADM3082/ADM3085/ADM3088 are high-speed RS-485/RS-422 transceivers consisting of one driver and one receiver per package. The devices feature fail-safe operation, ensuring a logic-high receiver output when the receiver inputs are open-circuit or short-circuit. This guarantees that the receiver output will be high if all the transmitters on a terminated bus are disabled (high-impedance). The ADM3082 has a slew-rate limited driver to minimize electromagnetic interference (EMI) and reduce reflections caused by incorrectly terminated cables. This allows errorfree transmission at data rates up to 115kbps. The ADM3085 offers a higher slew rate allowing data rates up to 500kbps, while the ADM3088 has a driver whose slew rate is not limited, allowing data rates up to 10Mbps. All devices in the family feature ±15kV electrostatic discharge (ESD) protection and high receiver input impedance (1/8 unit load), allowing up to 256 transceivers on the bus. The devices have low current drain of 375µA unloaded, or fully loaded with the drivers disabled, and feature an ultra-low power (1nA) shutdown mode. FUNCTIONAL BLOCK DIAGRAM RO RE DE DI 1 R 2 3 4 D 8 7 6 5 VCC B A G ND AD M 30 82/A D M 308 5/AD M 3088 REV. PrA 02/02 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 2002 www.DataSheet4U.com PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 SPECIFICATIONS DC ELECTRICAL CHARACTERISTICS (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) DRIVER Parameter Differential Driver Output, V OD1 Differential Driver Output,VOD2 Change-in-Magnitude of Differential Common-Mode Output Voltage, ⌬V OD Driver Common-Mode Output Voltage, VOC Change-in-Magnitude of Common-Mode Voltage, ⌬ VOC Input High Voltage,VIH1 (DE, DI, RE) Input Low Voltage, VlL1 (DE, DI, RE) DI Input Hysteresis, VHYS Input Current, IIN1 (DE, DI, RE) Input Current (A and B), IIN4 100 ±2 125 –75 Output Leakage (Y and Z), Full Duplex, IO –100 Driver Short-Circuit,V OD1 Output Current ±25 –250 250 125 2.0 0.8 2.0 1.5 0.2 3 0.2 Min Typ Max 5 Units Test Conditions/Comments V V V V V V V V mV µA µA µA µA µA mA mA mA DE VIN DE VIN DE VIN DE VIN = = = = = = = = GND, VCC = GND or 5.25V, 12V GND, VCC = GND or 5.25V, –7V GND, VCC = GND or 5.25V, 12V GND, VCC = GND or 5.25V, –7V Figure 1 (No Load) Figure 1, R = 50⍀ (RS-422) Figure 1, R = 27⍀ (RS-485) Figure 1, R = 50⍀ or R = 27⍀ (Note 2) Figure 1, R = 50⍀ or R = 27⍀ Figure 1, R = 50⍀ or R = 27⍀ (Note 2) –7V Յ VOUT Յ VCC (Note 3) 0V Յ VOUT Յ 12V (Note 3) 0V Յ VOUT Յ VCC (Note 3) –2– REV. PrA 02/02 www.DataSheet4U.com PRELIMINARY TECHNICAL DATA ADM3082/ADM3085/ADM3088 ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued) DC ELECTRICAL CHARACTERISTICS (VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) RECEIVER Parameter Receiver Differential Threshold Voltage, VTH Receiver Input Hysteresis, ⌬VTH Receiver Output High Voltage, VOH Receiver Output Low Voltage, VOL Three-State Output Current at Receiver, IOZR Receiver Input Resistance, RIN Receiver Output Short-Circuit Current, IOSR 96 ±7 ±95 VCC –1 .5 0.4 ±1 Min –200 Typ –125 25 Max –50 Units Test Conditions/Comments mV mV V V µA k⍀ mA IO = -4mA, VID = -50mV IO = 4mA, VID = -200mV 0.4V Յ VO Յ 2.4V –7V Յ VCM Յ 12V 0V Յ VRO Յ VCC –7V Յ VCM Յ 12V SUPPLY CURRENT Parameter Supply Current, ICC Min Typ 430 375 Supply Current in Shutdown Mode, ISHDN ESD Protection for Y, Z, A, B NOTES 1 2 Max 900 600 10 Units Test Conditions/Comments µA µA µA kV No DE No DE load, RE = DI = GND or VCC, = VCC load, RE = DI = GND or VCC, = GND 0.001 ±15 DE = GND, VRE = VCC Human Body Model All currents into the device are positive; all currents out of the device are negative. All voltages are referred to devic.


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