ADM2491E: Signal Isolated RS-485 Transceiver Full/Half Duplex
The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For halfduplex operation, ...More
ADM2491E: Signal Isolated RS-485 Transceiver Full/Half Duplex
Product Description
The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For halfduplex operation, the transmitter outputs and the receiver inputs share the same transmission line. Transmitter output Pin Y is linked externally to receiver input Pin A, and transmitter output Pin Z to receiver input Pin B. The ADM2491E is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler ® technology to combine a 3-channel isolator, a threestate differential line driver, and a differential input receiver into a single package
The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 5 V supply. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention could cause excessive power dissipation. The ADM2491E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +85°C temperature range.
- Data Sheet Rev A, 12/2008 (pdf 518kB)
- (About Data Sheets)
Quick Links
- Lead(Pb) - Free Data
- Application Notes (pdf 245kB)
Features
- Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex
- ±8 kV ESD protection on RS-485 input/output pins
- 16 Mbps data rate
- Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E)
- Suitable for 5 V or 3.3 V operation (VDD1)
- High common-mode transient immunity: >25 kV/@s
- Receiver has open-circuit, fail-safe design
- 32 nodes on the bus
- Thermal shutdown protection
- Safety and regulatory approvals pending
UL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Reinforced insulation, VIORM = 848 V peak
Diagrams
- Enlarge
- Other Diagrams
- Symbols and Footprints
Functional Block Diagram for ADM2491E
Signal Isolated RS-485 Transceiver Full/Half Duplex
Other Diagrams for ADM2491E
Signal Isolated RS-485 Transceiver Full/Half Duplex
Pin Configuration
Circuit Diagram #1
Circuit Diagram #2
Circuit Diagram #3
Circuit Diagram #4
Circuit Diagram #5
Functional Block Diagram for ADM2491E
ADN4663 - Dual, 3 V, CMOS, LVDS High Speed Differential Driver
ADN4665 - 3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4666 - 3 V, LVDS, Quad CMOS Differential Line Receiver
ADN4662 - Single, 3 V, CMOS, LVDS Differential Line Receiver
| Part# | Protocols | Data Rate | #Tx | # Rx | Pos Supply | Supply Current | 15 kV ESD | Low Pwr Shutdown | Product Description | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|---|
| ADM2482E | RS-422, RS-485 | 16Mbps | 2 | 1 | +3 to +5.5 | 6mA | Yes | No | Isolated RS-485 Xceiver, Full/Half Duplex w/ Transformer Drvr | $4.66 |
| ADM2484E | RS-422, RS-485 | 500kbps | 2 | 2 | +3 to +5.5 | 2mA | Yes | No | 500 kbps, ESD Protected, Half-/Full-Duplex, iCoupler, Isolated RS-485 Transceiver | $3.04 |
| ADM2487E | RS-422, RS-485 | 500kbps | 2 | 1 | +3 to +5.5 | 4mA | Yes | No | 2.5 kV Isolated RS-485 Transceivers with Integrated Transformer Driver | $3.64 |
| ADM2491E | RS-422, RS-485 | 16Mbps | 2 | 2 | +3 to +5.5 | n/a | No | No | High Speed, ESD-Protected, Half-/Full-Duplex, iCoupler Isolated RS-485 Transceiver | $4.76 |
| ADM2582E | RS-422, RS-485 | 16Mbps | 1 | 1 | +3 to +5.5 | - | Yes | No | 16 Mbps Isolated 15kV ESD Protected RS-485 Transceiver w/ Integrated Isolated DC/DC Converter | - |
| ADM2587E | RS-422, RS-485 | 500kbps | 1 | 1 | +3 to +5.5 | - | Yes | No | 500 kBps Isolated 15kV ESD Protected RS-485 Transceiver w/ Integrated Isolated DC/DC Converter | - |
| ADM3251E | RS-232 | 460kbps | 1 | 1 | +4.5 to +5.5 | 110mA | Yes | No | Isolated Single Channel, RS-232 Line Driver/Receiver | $2.99 |
| ADM4850 | RS-422, RS-485 | 115kbps | 1 | 1 | +4.75 to +5.25 | 160µA | No | Yes | 5V, Slew Rate Limited, Half-Duplex, RS-485/RS-422 Transceivers | $0.71 |
| ADM4854 | RS-422, RS-485 | 115kbps | 1 | 1 | +4.75 to +5.25 | 160µA | No | No | 5V, Slew Rate Limited, Full-Duplex, RS-485/RS-422 Transceivers | $0.71 |
| ADM560 | RS-232 | 116kbps | 4 | 5 | +3 to +3.6 | 5mA | No | Yes | Ultralow Power, +3.3V, RS-232 Notebook PC Serial Port Drivers/Receivers | $2.41 |
| ADM561 | RS-232 | 116kbps | 4 | 5 | +3 to +3.6 | 5mA | No | Yes | Ultralow Power, +3.3V, RS-232 Notebook PC Serial Port Drivers/Receivers | $2.41 |
| ADM232L | RS-232 | 120kbps | 2 | 2 | +4.5 to +5.5 | 13mA | No | No | +5V Powered, CMOS RS-232 Drivers/Receivers | $1.27 |
| ADM233L | RS-232 | 120kbps | 2 | 2 | +4.75 to +5.25 | 13mA | No | No | +5V Powered CMOS RS-232 Drivers/Receivers | $2.79 |
| ADM202 | RS-232 | 120kbps | 2 | 2 | +4.5 to +5.5 | 6mA | No | No | High Speed, +5V, 0.1 µF CMOS RS-232 Driver/Receivers | $1.27 |
| ADM203 | RS-232 | 120kbps | 2 | 2 | +4.5 to +5.5 | 6mA | No | No | High Speed, +5V, 0.1 µF CMOS RS-232 Driver/Receiver | - |
| ADM231L | RS-232 | 120kbps | 2 | 2 | +4.5 to +5.5 | 13mA | No | No | +5V & +12V Powered, CMOS RS-232 Driver/Receiver | - |
| ADM209 | RS-232 | 120kbps | 3 | 5 | +4.5 to +5.5 | 1mA | No | No | 0.1 µF, +5V & +12V Powered CMOS RS-232 Driver/Receiver | - |
| ADM239L | RS-232 | 120kbps | 3 | 5 | +4.5 to +5.5 | 13mA | No | No | +5V & +12V Powered, CMOS RS-232 Drivers/Receivers | - |
| ADM206 | RS-232 | 120kbps | 4 | 3 | +4.5 to +5.5 | 7mA | No | Yes | 0.1 µF, +5V Powered CMOS RS-232 Driver/Receiver | $2.31 |
| ADM208 | RS-232 | 120kbps | 4 | 4 | +4.5 to +5.5 | 9mA | No | No | 0.1 µF, +5V Powered CMOS RS-232 Driver/Receiver | $2.40 |
| ADM211 | RS-232 | 120kbps | 4 | 5 | +4.5 to +5.5 | 7mA | No | Yes | 0.1 µF, +5V Powered CMOS RS-232 Driver/Receiver | $1.94 |
| ADM213 | RS-232 | 120kbps | 4 | 5 | +4.5 to +5.5 | 7mA | No | Yes | 0.1 µF, +5V Powered CMOS RS-232 Driver/Receiver | $2.40 |
| ADM236L | RS-232 | 120kbps | 4 | 3 | +4.5 to +5.5 | 103mA | No | Yes | +5V Powered CMOS RS-232 Drivers/Receivers | - |
| ADM238L | RS-232 | 120kbps | 4 | 4 | +4.5 to +5.5 | 13mA | No | No | +5V Powered CMOS RS-232 Drivers/Receivers | $2.40 |
| ADM241L | RS-232 | 120kbps | 4 | 5 | +4.5 to +5.5 | 13mA | No | Yes | 5 V Powered CMOS RS-232 Interface Line Drivers/Receivers | $2.31 |
| ADM207 | RS-232 | 120kbps | 5 | 3 | +4.5 to +5.5 | 9mA | No | No | 0.1 µF, +5V Powered CMOS RS-232 Driver/Receiver | $2.40 |
| ADM237L | RS-232 | 120kbps | 5 | 3 | +4.75 to +5.25 | 13mA | No | No | +5V Powered CMOS RS-232 Drivers/Receivers | $2.31 |
| ADM222 | RS-232 | 200kbps | 2 | 2 | +4.5 to +5.5 | 8mA | No | Yes | High Speed, +5V, 0.1 µF CMOS RS-232 Driver/Receiver | $1.58 |
| ADM232A | RS-232 | 200kbps | 2 | 2 | +4.5 to +5.5 | 8mA | No | No | High Speed, +5V, 0.1 µF CMOS RS-232 Driver/Receivers | $1.58 |
| ADM242 | RS-232 | 200kbps | 2 | 2 | +4.5 to +5.5 | 8mA | No | Yes | High Speed, +5V, 0.1 µF, CMOS RS-232 Interface Line Driver/Receivers | $1.58 |
| ADM1181A | RS-232 | 230kbps | 2 | 2 | +4.5 to +5.5 | 6mA | Yes | No | EMI/EMC-Compliant, ±15 kV, ESD Protected, RS-232 Line Drivers/Receivers | $1.42 |
| ADM202E | RS-232 | 230kbps | 2 | 2 | +4.5 to +5.5 | 6mA | Yes | No | EMI/EMC-Compliant, ±15 kV ESD Protected, RS-232 Line Driver/Receiver | $1.48 |
| ADM206E | RS-232 | 230kbps | 4 | 3 | +4.5 to +5.5 | 13mA | Yes | Yes | EMI/EMC Compliant, ±15kV Protected, RS-232 Line Driver/Receiver | $2.23 |
| ADM208E | RS-232 | 230kbps | 4 | 4 | +4.5 to +5.5 | 13mA | Yes | No | EMI/EMC Compliant, ±15kV Protected, RS-232 Line Driver/Receiver | $2.23 |
| ADM211E | RS-232 | 230kbps | 4 | 5 | +4.5 to +5.5 | 13mA | Yes | Yes | EMI/EMC Compliant, ±15kV Protected, RS-232 Line Driver/Receiver | $2.32 |
| ADM213E | RS-232 | 230kbps | 4 | 5 | +4.5 to +5.5 | 13mA | Yes | Yes | EMI/EMC Compliant, ±15kV Protected, RS-232 Line Driver/Receiver | $2.32 |
| ADM207E | RS-232 | 230kbps | 5 | 3 | +4.5 to +5.5 | 13mA | Yes | No | EMI/EMC Compliant, ±15kV Protected, RS-232 Line Driver/Receiver | $2.32 |
| ADM3070E | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | Yes | 3.3V, ±15kV ESD, Full-Duplex, 250kbps, RS-422/485 Transceiver w/ Drvr/Rcvr Output-Enable Inputs | $1.62 |
| ADM3071E | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | No | 3.3V, ±15kV ESD, 250kbps, Full Duplex Interface Transceiver | $1.57 |
| ADM3072E | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | Yes | 3.3V, ±15kV ESD, Half-Duplex, 250kbps Transceiver w/ Driver/Receiver Enable Inputs | $1.52 |
| ADM3483E | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 2.2mA | Yes | Yes | 3.3 V, ±15 kV ESD-Protected, 250kbps Half-Duplex, RS-485/RS-422 Transceiver | $1.32 |
| ADM3488E | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 2.2mA | Yes | No | 3.3 V, ±15 kV ESD-Protected, 250kbps Full-Duplex, RS-485/RS-422 Transceiver | $1.32 |
| ADM487E | RS-422, RS-485 | 250kbps | 1 | 1 | +4.75 to +5.25 | 400µA | Yes | Yes | 5 V, 128 Nodes, ±15 kV ESD-Protected, 250kbps Half-Duplex Transceiver | $1.32 |
| ADM3488 | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 2.2mA | No | No | RS-422/485, 3.3 V Slew - Rate Limited, Full Duplex Low Power Transceiver | $0.91 |
| ADM3493 | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 2.2mA | No | Yes | 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver | $0.96 |
| ADM3483 | RS-422, RS-485 | 250kbps | 1 | 1 | +3 to +3.6 | 2.2mA | No | Yes | 3.3 V, 250 kbps, slew rate Limited, Half-Duplex, RS-485/RS-422 Transceiver | $0.91 |
| ADM483 | RS-422, RS-485 | 250kbps | 1 | 1 | +4.75 to +5.25 | 650µA | No | Yes | 5 V, Low Power, Slew-Rate Limited, RS-485/RS-422 Transceiver | $0.67 |
| ADM483E | RS-422, RS-485 | 250kbps | 1 | 1 | +4.5 to +5.5 | 10µA | Yes | Yes | ±15 kV ESD Protected, EMC Compliant, Slew Rate Limited, EIA RS-485 Transceiver | $1.27 |
| ADM488 | RS-422, RS-485 | 250kbps | 1 | 1 | +4.5 to +5.5 | 74µA | No | No | Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceiver | $1.11 |
| ADM489 | RS-422, RS-485 | 250kbps | 1 | 1 | +4.5 to +5.5 | 74µA | No | No | Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceiver w/ Rcvr & Drvr enables | $1.62 |
| ADM3101E | RS-232 | 460kbps | 1 | 1 | +3 to +5.5 | 5mA | Yes | No | 3.3 V, Single Channel RS-232 Line Driver/Receiver | $0.89 |
| ADM101E | RS-232 | 460kbps | 1 | 1 | +4.5 to +5.5 | 1mA | Yes | Yes | Craft Port, Tiny RS-232 Transceiver for Portable Applications | $0.78 |
| ADM3232E | RS-232 | 460kbps | 2 | 2 | +3 to +5.5 | 3mA | Yes | No | ±15 kV ESD Protected, 3.3 V, RS-232 Line Driver/Receiver | $1.37 |
| ADM1385 | RS-232 | 460kbps | 2 | 2 | +3 to +3.6 | 2.1mA | No | Yes | High-Speed, 2-Channel RS-232/V.28 Interface Transceiver | $1.42 |
| ADM3202 | RS-232 | 460kbps | 2 | 2 | +3 to +5.5 | 3mA | Yes | No | High-Speed, Low Power, 2-Channel RS-232/V.28 Interface Line Driver/Receiver | $1.37 |
| ADM3222 | RS-232 | 460kbps | 2 | 2 | +3 to +3.6 | 2.1mA | No | Yes | High-Speed, 2-Channel, RS-232/V.28 Interface Devices | $1.37 |
| ADM3311E | RS-232 | 460kbps | 3 | 5 | +2.7 to +3.6 | 1µA | Yes | Yes | 15 kV ESD Protected, 2.7V to 3.6V, Serial Port Transceivers with Green Idle | $1.72 |
| ADM3312E | RS-232 | 460kbps | 3 | 3 | +2.7 to +3.6 | 1µA | Yes | Yes | 15 kV ESD Protected, 2.7V to 3.6V, Serial Port Transceivers with Green Idle | $1.47 |
| ADM3315E | RS-232 | 460kbps | 3 | 3 | +2.7 to +3.6 | 0.85mA | Yes | Yes | 15 kV ESD Protected, 2.7V to 3.6V, Serial Port Transceivers with Green Idle | $1.52 |
| ADM3310E | RS-232 | 460kbps | 3 | 5 | +2.7 to +3.6 | 0.85µA | Yes | Yes | 15 kV ESD Protected, 2.7V to 3.6V, Serial Port Transceivers with Green Idle | $1.52 |
| ADM3073E | RS-422, RS-485 | 500kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | Yes | 3.3V, ±15kV ESD, Full-Duplex, 500kbps Interface-Transceiver w/ Driver/Receiver Enable Input | $1.62 |
| ADM3074E | RS-422, RS-485 | 500kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | No | 3.3V, ±15kV ESD, Full-Duplex, 500 kbps Interface Transceiver | $1.52 |
| ADM3075E | RS-422, RS-485 | 500kbps | 1 | 1 | +3 to +3.6 | 1.5mA | Yes | Yes | 3.3V, ±15kV ESD, Half-Duplex, 500kbps Interface Transceiver w/ Driver/Receiver Enable Inputs | $1.52 |
| ADM2483 | RS-485 | 500kbps | 1 | 1 | +2.7 to +5.5 | 2.5mA | No | No | iCoupler® Galvanically Isolated, Slew Rate Limited RS-485 Transceiver w/ fail safe&thermal shutdown | $3.04 |
| ADM4851 | RS-422, RS-485 | 500kbps | 1 | 1 | +4.75 to +5.25 | 200µA | No | Yes | 5V, Slew Rate Limited, Half-Duplex, RS-485/RS-422 Transceiver | $0.71 |
| ADM4855 | RS-422, RS-485 | 500kbps | 1 | 1 | +4.75 to +5.25 | 200µA | No | No | 5V, Slew Rate Limited, Full-Duplex, RS-485/RS-422 Transceivers | $0.71 |
| ADM2209E | RS-232 | 920kbps | 6 | 10 | +10.8 to +13.2 | 5mA | Yes | Yes | EMI-/EMC-Compliant, ±15 kV ESD Protected, Dual RS-232 Port w/ Low Power Standby Mode | $2.78 |
| ADM3307E | RS-232 | 1Mbps | 5 | 3 | +2.7 to +3.6 | 1µA | Yes | Yes | 15 kV ESD Protected, 2.7V to 3.6V, Serial Port Transceivers with Green Idle | $1.47 |
| ADM1487E | RS-422, RS-485 | 2.5Mbps | 1 | 1 | +4.75 to +5.25 | 500µA | Yes | No | 5 V, 128 Nodes, ±15 kV ESD-Protected, 2.5Mbps Half-Duplex Transceiver | $1.32 |
| ADM3486E | RS-422, RS-485 | 2.5Mbps | 1 | 1 | +3 to +3.6 | 2.2mA | Yes | Yes | 3.3 V, ±15 kV ESD, Half-Duplex, 2.5 Mbps RS-422/485 Transceiver w/ Xmit/Rcvr Output Enable Inputs | $1.32 |
| ADM485E | RS-422, RS-485 | 2.5Mbps | 1 | 1 | +4.75 to +5.25 | 900µA | Yes | No | 5 V, 32 Nodes, ±15 kV ESD-Protected, 2.5Mbps Half-Duplex Transceiver | $1.32 |
| ADM4852 | RS-422, RS-485 | 2.5Mbps | 1 | 1 | +4.75 to +5.25 | 500µA | No | Yes | 5V, Slew Rate Limited, Half-Duplex, RS-485/RS-422 Transceivers | $0.71 |
| ADM4856 | RS-422, RS-485 | 2.5Mbps | 1 | 1 | +4.75 to +5.25 | 500µA | No | No | 5V, Slew Rate Limited, Full-Duplex, RS-485/RS-422 Transceivers | $0.71 |
| ADM485 | RS-422, RS-485 | 5Mbps | 1 | 1 | +4.75 to +5.25 | 2.2mA |