adm3485e Analog Devices, Inc., adm3485e Datasheet
adm3485e
Available stocks
Related parts for adm3485e
adm3485e Summary of contents
Page 1
... EMI-sensitive systems Industrial control Local area networks GENERAL DESCRIPTION The ADM3485E is a 3.3 V, low power data transceiver with ±15 kV ESD protection, suitable for half-duplex communi- cation on multipoint bus transmission lines. The ADM3485E is designed for balanced data transmission and complies with TIA/EIA standards RS485 and RS-422. The ADM3485E is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and the receiver ...
Page 2
... ADM3485E TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications....................................................................... 4 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configuration and Pin Function Descriptions...................... 6 REVISION HISTORY 12/06—Rev Rev. C Updated Format..................................................................Universal Removed PDIP Model .......................................................Universal Changes to Features, Applications, and General Description .... 1 Changes to Specifications ...
Page 3
... < V < OUT CC 3 load 1 load μ Human body model kV Human body model ADM3485E = – ...
Page 4
... ADM3485E TIMING SPECIFICATIONS 25° Table 2. Parameter DRIVER Maximum Data Rate Differential Output Delay Differential Output Transition Time Propagation Delay From Low to High Level From High to Low Level |t − Propagation Delay Skew PLH PHL Enable/Disable Timing Enable Time to Low Level ...
Page 5
... Table 4. Thermal Resistance –0 Package Type –0 0 8-Lead SOIC_N − +13 V ±250 mA ESD CAUTION 650 mW –40°C to +85°C –65°C to +150°C 300°C 215°C 220°C ±15 kV Rev Page ADM3485E θ Unit JA 158 °C/W ...
Page 6
... RE 2 Receiver Output Enable. With RE low, the receiver output (RO) is enabled. With RE high, the output goes into a high impedance state high and DE is low, the ADM3485E enters a shutdown state Driver Output Enable. A high level enables the driver differential outputs A and B. A low level places high impedance state ...
Page 7
... PPR = 250kHz, 50% DUTY CYCLE, ≤ 6.0ns 50Ω INCLUDES PROBE AND STRAY CAPACITANCE. L 1.5V 1. PZH PHZ 0.25V OUT V OM Figure 8. Driver Enable and Disable Times (t ADM3485E 27Ω L OUT 2 = 15pF L = 50Ω OUT R = 110Ω ...
Page 8
... ADM3485E 50pF L 1 GENERATOR 50Ω PPR = 250kHz, 50% DUTY CYCLE, ≤ 6.0ns INCLUDES PROBE AND STRAY CAPACITANCE 1.5V 1.5V t PSL OUT V OM Figure 9. Driver Enable and Disable Times (t +1.5V –1.5V 1 PPR = 250kHz, 50% DUTY CYCLE INCLUDES PROBE AND STRAY CAPACITANCE. ...
Page 9
... Figure 16. Driver Output Current vs. Differential Output Voltage 2 –1.5mA RO 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1 Figure 17. Driver Differential Output Voltage vs. Temperature Rev Page – TEMPERATURE (°C) Figure 15. Receiver Output Low Voltage vs. Temperature 0 0 0.5 1.0 1.5 2.0 2.5 DIFFERENTIAL OUTPUT VOLTAGE (V) –50 – TEMPERATURE (°C) ADM3485E I = 2.5mA RO 85 3.0 3 54Ω ...
Page 10
... ADM3485E 120 100 OUTPUT LOW VOLTAGE (V) Figure 18. Output Current vs. Driver Output Low Voltage 120 100 –7 –6 –5 –4 –3 –2 –1 OUTPUT HIGH VOLTAGE (V) Figure 19. Output Current vs. Driver Output High Voltage 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 –40 –10 20 TEMPERATURE (°C) Figure 20 ...
Page 11
... I/O discharge, where the equipment is operating normally when the discharge occurs. Table 9. ESD Test Results ESD Test Method Human Body Model 100% 1 90% 2 High-Z 36.8% 10 Figure 24. Human Body Model Current Waveform Rev Page ADM3485E I/O Pins ± TIME t DL ...
Page 12
... ADM3485E The ADM3485E is designed for bidirectional data communi- cations on multipoint transmission lines. A typical application showing a multipoint transmission network is illustrated in Figure 25. Only one driver can transmit at a particular time, but multiple receivers may be enabled simultaneously. As with any transmission line important that reflections are minimized ...
Page 13
... Temperature Range ADM3485EAR –40°C to +85°C ADM3485EAR-REEL7 –40°C to +85°C ADM3485EAR-REEL –40°C to +85°C 1 ADM3485EARZ –40°C to +85°C 1 ADM3485EARZ-REEL7 –40°C to +85°C 1 ADM3485EARZ-REEL –40°C to +85° Pb-free part. 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497 ...
Page 14
... ADM3485E NOTES Rev Page ...
Page 15
... NOTES Rev Page ADM3485E ...
Page 16
... ADM3485E NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03338-0-12/06(C) T Rev Page ...