Overview
The ADM489AN, produced by Analog Devices Inc., is a full-duplex, low power, slew rate limited transceiver designed for communication on multipoint bus transmission lines. It complies with both EIA RS-485 and RS-422 standards, making it suitable for balanced data transmission. The device contains a single differential line driver and a single differential line receiver, enabling full-duplex data transfer. Additionally, the ADM489AN includes an extra receiver and driver enable control, enhancing its functionality.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature | -40°C to +85°C | °C |
| Supply Voltage | 4.5 V to 5.5 V | V |
| Bus Common-Mode Range | -7 V to +12 V | V |
| Data Rate | Up to 250 kbps | kbps |
| Input Impedance | 12 kΩ | kΩ |
| Supply Current | 30 μA | μA |
| Package Types | PDIP, SOIC, TSSOP | |
| ESD Protection | 2 kV EFT protection (IEC1000-4-4) | kV |
| EM Immunity | Meets IEC1000-4-3 |
Key Features
- Compliance with EIA RS-485 and RS-422 standards
- Full-duplex data transfer capability
- Single differential line driver and receiver
- Additional receiver and driver enable control (ADM489AN)
- Low power consumption (30 μA supply current)
- High input impedance (12 kΩ) allowing up to 32 transceivers on the bus
- Reduced slew rate for low electromagnetic interference
- Short-circuit protection and thermal shutdown circuit
- Fail-safe feature resulting in a logic high output state if inputs are unconnected
- Immunity to high RF field strengths without special shielding
Applications
- Low power RS-485 and RS-422 systems
- DTE-DCE interface
- Packet switching
- Local area networks
- Data concentration and data multiplexers
- Integrated services digital network (ISDN)
Q & A
- What are the primary standards that the ADM489AN complies with?
The ADM489AN complies with both EIA RS-485 and RS-422 standards.
- What is the operating temperature range of the ADM489AN?
The operating temperature range is -40°C to +85°C.
- What is the maximum data rate supported by the ADM489AN?
The maximum data rate supported is up to 250 kbps.
- How many transceivers can be connected on the bus?
Up to 32 transceivers can be connected on the bus due to the high input impedance of 12 kΩ.
- What type of protection does the ADM489AN have against electrical faults?
The ADM489AN has short-circuit protection and a thermal shutdown circuit to prevent excessive power dissipation.
- Does the ADM489AN have any special shielding requirements for RF immunity?
No, the ADM489AN is immune to high RF field strengths without special shielding precautions.
- What is the supply voltage range for the ADM489AN?
The supply voltage range is 4.5 V to 5.5 V.
- What is the purpose of the reduced slew rate in the ADM489AN?
The reduced slew rate minimizes electromagnetic interference.
- What happens if the inputs to the receiver are unconnected (floating)?
If the inputs are unconnected, the receiver output defaults to a logic high state due to the fail-safe feature.
- In what types of packages is the ADM489AN available?
The ADM489AN is available in PDIP, SOIC, and TSSOP packages.
