Overview
The ADM3491AR-REEL7, produced by Analog Devices Inc., is a low-power, differential line transceiver designed to operate using a single 3.3 V power supply. This device is ideal for power-sensitive applications due to its low power consumption and shutdown mode. It is suitable for communication on multipoint bus transmission lines and complies with both Electronic Industries Association (EIA) Standards RS-485 and RS-422. The ADM3491-1 contains a differential line driver and a differential line receiver, making it suitable for full-duplex data transfer.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| Operating Supply Voltage | 3.0 | 3.3 | 3.6 | V | |
| Supply Current (ICC) | 0.84 | 1.2 | 1.5 | mA | Outputs unloaded, DE = VCC, RE = 0 V |
| Shutdown Current | 0.002 | 1 | μA | DE = 0 V, RE = VCC | |
| Data Rate | 20 | Mbps | |||
| Propagation Delay (Input to Output) | 25 | 65 | 115 | ns | CL = 15 pF |
| Skew (TPLH – TPHL) | 20 | ns | CL = 15 pF | ||
| Operating Temperature Range | -40 | 85 | °C | ||
| Package Style | PDIP, SOIC, TSSOP | ||||
| Bus Common-Mode Range | -7 | 12 | V | ||
| Number of Transceivers on Bus | 32 |
Key Features
- Operates with a single 3.3 V power supply and is interoperable with 5 V logic.
- EIA RS-422 and RS-485 compliant over full common-mode range.
- Low power consumption with a supply current of 840 μA and a shutdown current of 2 nA.
- Full-duplex communication with driver and receiver enable.
- Thermal shutdown circuit to prevent excessive power dissipation.
- Fail-safe feature that results in a logic high output state if inputs are unconnected (floating).
- Meets IEC1000-4-4 (>1 kV) for ESD protection.
- Available in PDIP, SOIC, and TSSOP packages.
Applications
- Telecommunications: DTE–DCE interface, packet switching.
- Local area networks, data concentration, data multiplexers.
- Integrated services digital network (ISDN), AppleTalk.
- Industrial controls, HVAC, and industrial process control.
Q & A
- What is the operating supply voltage range of the ADM3491AR-REEL7?
The operating supply voltage range is from 3.0 V to 3.6 V.
- What is the maximum data rate supported by the ADM3491AR-REEL7?
The maximum data rate supported is up to 20 Mbps.
- What is the typical supply current of the ADM3491AR-REEL7?
The typical supply current is 840 μA.
- What is the shutdown current of the ADM3491AR-REEL7?
The shutdown current is 2 nA.
- Is the ADM3491AR-REEL7 compliant with RS-422 and RS-485 standards?
Yes, it is compliant with both EIA RS-422 and RS-485 standards over the full common-mode range.
- What is the operating temperature range of the ADM3491AR-REEL7?
The operating temperature range is from -40°C to 85°C.
- What types of packages are available for the ADM3491AR-REEL7?
It is available in PDIP, SOIC, and TSSOP packages.
- Does the ADM3491AR-REEL7 have thermal shutdown protection?
Yes, it has a thermal shutdown circuit to prevent excessive power dissipation.
- How many transceivers can be connected on the bus?
Up to 32 transceivers can be connected on the bus.
- What is the bus common-mode range of the ADM3491AR-REEL7?
The bus common-mode range is from -7 V to +12 V.
