Overview
The ADM3491AR-1 is a low-power, differential line transceiver designed by Analog Devices Inc. It operates using a single 3.3 V power supply, making it ideal for power-sensitive applications. This transceiver is compliant with both Electronic Industries Association (EIA) Standards RS-485 and RS-422, and it is suitable for full-duplex data transfer on multipoint bus transmission lines. The ADM3491AR-1 features low power consumption, a shutdown mode, and advanced BiCMOS technology, combining low power CMOS with fast switching bipolar technology.
Key Specifications
| Parameter | Value | Unit | Comments |
|---|---|---|---|
| Supply Voltage (VCC) | 3.3 V ± 0.3 V | V | |
| Supply Current (ICC) | 840 μA | μA | Typical, VCC = 3.3 V |
| Shutdown Current | 2 nA | nA | Typical, RE high, DE low |
| Data Rate | Up to 20 Mbps | Mbps | |
| Input Impedance | 19 kΩ | kΩ | Allowing up to 50 transceivers on the bus |
| Operating Temperature | -40°C to +85°C | °C | |
| Package Type | PDIP, SOIC, TSSOP | ||
| ESD Protection | IEC1000-4-4 (>1 kV) | ||
| Skew | 8 ns | ns |
Key Features
- Operates with a single 3.3 V power supply
- EIA RS-422 and RS-485 compliant over full common-mode range
- Up to 50 transceivers can be connected on the bus due to 19 kΩ input impedance
- 20 Mbps data rate
- Short-circuit protection and thermal shutdown
- Interoperable with 5 V logic
- Fail-safe feature for unconnected (floating) inputs, resulting in a logic high output state
- Low power shutdown mode with 2 nA supply current
- 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
Q & A
- What is the operating voltage of the ADM3491AR-1?
The ADM3491AR-1 operates with a single 3.3 V power supply (± 0.3 V).
- What are the data rates supported by the ADM3491AR-1?
The ADM3491AR-1 supports data rates up to 20 Mbps.
- How many transceivers can be connected on the bus?
Up to 50 transceivers can be connected on the bus due to the 19 kΩ input impedance.
- What is the operating temperature range of the ADM3491AR-1?
The operating temperature range is -40°C to +85°C.
- What types of packages are available for the ADM3491AR-1?
The ADM3491AR-1 is available in PDIP, SOIC, and TSSOP packages.
- Does the ADM3491AR-1 have any ESD protection features?
Yes, it meets IEC1000-4-4 (>1 kV) for ESD protection.
- What is the typical supply current of the ADM3491AR-1?
The typical supply current is 840 μA.
- How does the shutdown mode affect the supply current?
In shutdown mode, the supply current is typically 2 nA.
- What happens if the inputs are unconnected (floating)?
If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state.
- Is the ADM3491AR-1 interoperable with 5 V logic?
Yes, the ADM3491AR-1 is interoperable with 5 V logic.
