Overview
The ADM489ARZ-REEL7 is a full-duplex, low power, slew rate limited transceiver produced by Analog Devices Inc. It is designed to comply with both EIA RS-485 and RS-422 standards, making it suitable for balanced data transmission on multipoint bus transmission lines. The device features a single differential line driver and a single differential line receiver, enabling full-duplex data transfer. Additionally, the ADM489 includes an extra receiver and driver enable control, enhancing its functionality.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V | |
| Data Rate | 250 | kbps | |||
| Input Impedance | 12 kΩ | ||||
| Bus Common-Mode Range | -7 | +12 | V | ||
| Short-Circuit Output Current | 85 mA | VOUT = GND or VCC | |||
| Power Supply Current (ICC) | 30 | 60 μA | Outputs unloaded, receivers enabled | ||
| Propagation Delay (TPLH, TPHL) | 250 | 2000 ns | RL Differential = 54 Ω, CL1 = CL2 = 100 pF |
Key Features
- Compliance with EIA RS-485 and RS-422 standards
- Full-duplex operation with a single differential line driver and receiver
- Additional receiver and driver enable control (ADM489)
- Low power consumption with a supply current of 30 μA to 60 μA
- High input impedance of 12 kΩ, allowing up to 32 transceivers on the bus
- Short-circuit protection and thermal shutdown circuitry
- 2 kV EFT protection and high EM immunity
- Reduced slew rate for low electromagnetic interference
- Excellent noise immunity
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 ADM489ARZ-REEL7 complies with?
The ADM489ARZ-REEL7 complies with both EIA RS-485 and RS-422 standards.
- What is the maximum data rate supported by the ADM489ARZ-REEL7?
The maximum data rate supported is 250 kbps.
- What is the input impedance of the ADM489ARZ-REEL7?
The input impedance is 12 kΩ.
- How many transceivers can be connected on the bus?
Up to 32 transceivers can be connected on the bus.
- What kind of protection does the ADM489ARZ-REEL7 offer against short circuits and thermal issues?
The device features short-circuit protection and a thermal shutdown circuit to prevent excessive power dissipation.
- What is the typical supply current for the ADM489ARZ-REEL7?
The typical supply current is between 30 μA and 60 μA.
- Does the ADM489ARZ-REEL7 have built-in protection against electromagnetic interference?
Yes, it has reduced slew rate for low electromagnetic interference and high EM immunity.
- What is the bus common-mode range for the ADM489ARZ-REEL7?
The bus common-mode range is from -7 V to +12 V.
- What kind of packaging is available for the ADM489ARZ-REEL7?
The device is available in 14-SOIC packaging.
- What are some common applications of the ADM489ARZ-REEL7?
Common applications include low power RS-485 and RS-422 systems, DTE-DCE interface, packet switching, local area networks, data concentration, data multiplexers, and ISDN.
