ADM2485: High Speed, Isolated RS-485 Transceiver with Integrated Transformer Driver |
The ADM2485 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E).
The device employs Analog Devices, Inc., iCoupler ® technology to combine a 3-channel isolator, a ...More
The ADM2485 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E).
The device employs Analog Devices, Inc., iCoupler ® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. An on-chip oscillator outputs a pair of square waveforms that drive an external transformer to provide isolated power with an external transformer. The logic side of the device can be powered with either a 5 V or a 3.3 V supply, and the bus side is powered with an isolated 5 V supply.
The ADM2485 driver has an active high enable. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output port that imposes minimal loading on the bus when the driver is disabled or when VDD1 or VDD2 = 0 V. Also provided is an active high receiver disable that causes the receive output to enter a high impedance state.
The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention 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.
Applications
Data Sheet, Rev. A, 12/07
| Part# | Min Pos Supply | Pwr Supply (Vnom) | Full-Half Duplex | ESD-Protection | Data Rate | # of Nodes On Bus | Drvr/Rcvr Enable | Fail Safe | Isolation V (rms) | Available Packages | Price* (1000-4999) | Protocols |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ADM2482E | +3 | +3 to +5 & ISO +3 | Full, Half | 15 kV | 16Mbps | 256 | Yes | Open, Short | 2.5 kV | SOIC | $4.66 | RS-422, RS-485 |
| ADM2484E | +3 | +3 to +5 & ISO +3 | Full, Half | 15 kV | 500kbps | 256 | Yes | Open, Short | 5 kV | SOIC | $3.04 | RS-422, RS-485 |
| ADM2487E | +3 | +3 to +5 & ISO +3 | Full, Half | 15 kV | 500kbps | 256 | Yes | Open, Short | 2.5 kV | SOIC | $3.64 | RS-422, RS-485 |
| ADM2491E | +3 | +3 to +5 & ISO +5 | Full, Half | 8 kV | 16Mbps | 32 | Yes | Open | 5 kV | SOIC | $4.76 | RS-422, RS-485 |
| ADM2582E | +3 | 3.3, 5 | Full, Half | 15 kV | 16Mbps | 256 | Yes | Open, Short | 2.5 kV | SOIC | $6.50 | RS-422, RS-485 |
| ADM2587E | +3 | 3.3, 5 | Full, Half | 15 kV | 500kbps | 256 | Yes | Open, Short | 2.5 kV | SOIC | $5.50 | RS-422, RS-485 |
| ADN4668 | +3 | 3.3 | --- | 15 kV | 400Mbps | - | Yes | - | - | SOIC, SOP | $1.16 | EIA-644, LVDS |
| ADM2490E | +2.7 | +3 to +5 & ISO +5 | Full | 8 kV | 16Mbps | 32 | No | Open | 5 kV | SOIC | $4.55 | RS-422, RS-485 |
| ADM2483 | +2.7 | +3 to +5 & ISO +5 | Half | --- | 500kbps | 256 | Yes | Open, Short | 2.5 kV | SOIC | $3.04 | RS-485 |
| ADM2485 | +2.7 | +3 to +5 & ISO +5 | Half | --- | 16Mbps | 50 | Yes | Open | 2.5 kV | SOIC | $5.57 | RS-422, RS-485 |
| ADM2486 | +2.7 | +3 to +5 & ISO +5 | Half | --- | 20Mbps | 50 | Yes | Open | 2.5 kV | SOIC | $5.04 | RS-485 |
| ADM3070E | +3 | 3.3 | Full | 15 kV | 250kbps | 256 | Yes | Open, Short | --- | SOIC | $1.62 | RS-422, RS-485 |
| ADM3071E | +3 | 3.3 | Full | 15 kV | 250kbps | 256 | No | Open, Short | --- | SOIC | $1.57 | RS-422, RS-485 |
| ADM3488E | +3 | 3.3 | Full | 15 kV | 250kbps | 32 | No | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM3488 | +3 | 3.3 | Full | --- | 250kbps | 32 | No | Open | --- | SOIC | $0.91 | RS-422, RS-485 |
| ADM3074E | +3 | 3.3 | Full | 15 kV | 500kbps | 256 | No | Open, Short | --- | SOIC | $1.52 | RS-422, RS-485 |
| ADM3490 | +3 | 3.3 | Full | --- | 10Mbps | 32 | No | Open | --- | SOIC | $1.01 | RS-422, RS-485 |
| ADM3491 | +3 | 3.3 | Full | --- | 10Mbps | 32 | Yes | Open | --- | DIP, SOIC, SOP | $1.37 | RS-422, RS-485 |
| ADM3490E | +3 | 3.3 | Full | 15 kV | 12Mbps | 32 | No | Open | --- | SOIC | $1.37 | RS-422, RS-485 |
| ADM3491E | +3 | 3.3 | Full | 15 kV | 12Mbps | 32 | Yes | Open | --- | SOIC | $1.42 | RS-422, RS-485 |
| ADM3076E | +3 | 3.3 | Full | 15 kV | 16Mbps | 256 | Yes | Open, Short | --- | SOIC | $1.62 | RS-422, RS-485 |
| ADM3077E | +3 | 3.3 | Full | 15 kV | 16Mbps | 256 | No | Open, Short | --- | SOIC | $1.57 | RS-422, RS-485 |
| ADM3072E | +3 | 3.3 | Half | 15 kV | 250kbps | 256 | Yes | Open, Short | --- | SOIC | $1.52 | RS-422, RS-485 |
| ADM3483E | +3 | 3.3 | Half | 15 kV | 250kbps | 32 | Yes | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM3493 | +3 | 3.3 | Half | --- | 250kbps | 256 | Yes | Open | --- | SOIC | $0.96 | RS-422, RS-485 |
| ADM3483 | +3 | 3.3 | Half | --- | 250kbps | 32 | Yes | Open | --- | SOIC | $0.91 | RS-422, RS-485 |
| ADM3073E | +3 | 3.3 | Half | 15 kV | 500kbps | 256 | Yes | Open, Short | --- | SOIC | $1.62 | RS-422, RS-485 |
| ADM3075E | +3 | 3.3 | Half | 15 kV | 500kbps | 256 | Yes | Open, Short | --- | SOIC | $1.52 | RS-422, RS-485 |
| ADM3486E | +3 | 3.3 | Half | 15 kV | 2.5Mbps | 32 | Yes | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM3485 | +3 | 3.3 | Half | --- | 10Mbps | 32 | Yes | Open | --- | SOIC | $1.01 | RS-422, RS-485 |
| ADM3485E | +3 | 3.3 | Half | 15 kV | 12Mbps | 50 | Yes | Open | --- | DIP, SOIC | $1.32 | RS-422, RS-485 |
| ADM3078E | +3 | 3.3 | Half | 15 kV | 16Mbps | 256 | Yes | Open, Short | --- | SOIC | $1.55 | RS-422, RS-485 |
| ADM488 | +4.5 | 5 | Full | --- | 250kbps | 32 | No | Open | --- | DIP, SOIC | $1.11 | RS-422, RS-485 |
| ADM489 | +4.5 | 5 | Full | --- | 250kbps | 32 | Yes | Open | --- | DIP, SOIC, SOP | $1.62 | RS-422, RS-485 |
| ADM483E | +4.5 | 5 | Half | 15 kV | 250kbps | 32 | Yes | Open | --- | DIP, SOIC | $1.27 | RS-422, RS-485 |
| ADM4854 | +4.75 | 5 | Full | --- | 115kbps | 256 | No | Open, Short | --- | SOIC | $0.71 | RS-422, RS-485 |
| ADM4855 | +4.75 | 5 | Full | --- | 500kbps | 256 | No | Open, Short | --- | SOIC | $0.71 | RS-422, RS-485 |
| ADM4856 | +4.75 | 5 | Full | --- | 2.5Mbps | 256 | No | Open, Short | --- | SOIC | $0.71 | RS-422, RS-485 |
| ADM4857 | +4.75 | 5 | Full | --- | 10Mbps | 256 | No | Open, Short | --- | SOIC | $0.71 | RS-422, RS-485 |
| ADM4850 | +4.75 | 5 | Half | --- | 115kbps | 256 | Yes | Open, Short | --- | CSP, MSOP, SOIC | $0.71 | RS-422, RS-485 |
| ADM487E | +4.75 | 5 | Half | 15 kV | 250kbps | 128 | Yes | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM483 | +4.75 | 5 | Half | --- | 250kbps | 32 | Yes | Open | --- | SOIC | $0.67 | RS-422, RS-485 |
| ADM4851 | +4.75 | 5 | Half | --- | 500kbps | 256 | Yes | Open, Short | --- | CSP, SOIC | $0.71 | RS-422, RS-485 |
| ADM1487E | +4.75 | 5 | Half | 15 kV | 2.5Mbps | 128 | Yes | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM485E | +4.75 | 5 | Half | 15 kV | 2.5Mbps | 32 | Yes | Open | --- | SOIC | $1.32 | RS-422, RS-485 |
| ADM4852 | +4.75 | 5 | Half | --- | 2.5Mbps | 256 | Yes | Open, Short | --- | CSP, SOIC | $0.71 | RS-422, RS-485 |
| ADM485 | +4.75 | 5 | Half | --- | 5Mbps | 32 | Yes | Open | --- | DIP, SOIC, SOP | $1.31 | RS-422, RS-485 |
| ADM4853 | +4.75 | 5 | Half | --- | 10Mbps | 256 | Yes | Open, Short | --- | CSP, SOIC | $0.71 | RS-422, RS-485 |
| ADM1486 | +4.75 | 5 | Half | --- | 30Mbps | 50 | Yes | Open | --- | SOIC | $2.07 | RS-422, RS-485 |
| ADM1485 | +4.75 | 5 | Half | --- | 30Mbps | 32 | Yes | Open | --- | DIP, SOIC, SOP | $1.63 | RS-422, RS-485 |
Table Default Sort is Power Supply (Ascending) then Full/Half Duplex Ascending
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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