Overview
The ADM1485AR-REEL7 is a differential line transceiver designed by Analog Devices Inc. for high-speed bidirectional data communication on multipoint bus transmission lines. It complies with both EIA RS-485 and RS-422 standards, making it suitable for a variety of applications requiring balanced data transmission.
This component operates from a single 5 V power supply and features thermal shutdown protection to prevent excessive power dissipation due to bus contention or output shorting. The ADM1485AR-REEL7 is known for its high speed, low power consumption, and superior performance in minimizing EMI interference.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Differential Output Voltage (VOD) | 2.0 | - | 5.0 | V | VCC = 5 V, R = 50 Ω (RS-422) |
| Differential Output Voltage (VOD) | 1.5 | - | 5.0 | V | VCC = 5 V, R = 27 Ω (RS-485) |
| Common-Mode Output Voltage (VOC) | - | - | 3 | V | R = 27 Ω or 50 Ω |
| Driver Propagation Delay | - | 10 | - | ns | - |
| Receiver Propagation Delay | - | 15 | - | ns | - |
| Bus Common-Mode Range | -7 | - | +12 | V | - |
Key Features
- Meets EIA RS-485 and RS-422 standards
- Single 5 V power supply
- High speed data rate of up to 30 Mbps
- Thermal shutdown protection and short-circuit protection
- High-Z outputs when power is off
- Low power consumption and minimal EMI interference
- Independent enable/disable for driver and receiver
Applications
- Low power RS-485 systems
- DTE-DCE interface
- Packet switching
- Local area networks
- Data concentration and data multiplexers
- Integrated Services Digital Network (ISDN)
Q & A
- What is the ADM1485AR-REEL7 used for?
The ADM1485AR-REEL7 is used for high-speed bidirectional data communication on multipoint bus transmission lines, complying with EIA RS-485 and RS-422 standards.
- What is the power supply requirement for the ADM1485AR-REEL7?
The ADM1485AR-REEL7 operates from a single 5 V power supply.
- What is the maximum data rate supported by the ADM1485AR-REEL7?
The ADM1485AR-REEL7 supports data rates of up to 30 Mbps.
- Does the ADM1485AR-REEL7 have thermal protection?
Yes, the ADM1485AR-REEL7 features thermal shutdown protection to prevent excessive power dissipation.
- What is the bus common-mode range of the ADM1485AR-REEL7?
The bus common-mode range is from -7 V to +12 V.
- Can the driver and receiver be enabled/disabled independently?
Yes, both the driver and receiver can be enabled or disabled independently, and when disabled, the outputs are three-stated.
- What are some typical applications of the ADM1485AR-REEL7?
Typical applications include low power RS-485 systems, DTE-DCE interfaces, packet switching, local area networks, data concentration, data multiplexers, and ISDN.
- How does the ADM1485AR-REEL7 minimize EMI interference?
The ADM1485AR-REEL7 minimizes EMI interference through its low skew and high-speed switching capabilities.
- What is the propagation delay for the driver and receiver of the ADM1485AR-REEL7?
The driver propagation delay is 10 ns, and the receiver propagation delay is 15 ns.
- Does the ADM1485AR-REEL7 have short-circuit protection?
Yes, the ADM1485AR-REEL7 includes short-circuit protection.
