Overview
The ADM485JRZ-REEL7, produced by Analog Devices Inc., is a high-speed, low-power differential line transceiver designed for bidirectional data communication on multipoint bus transmission lines. It complies with EIA standards RS-485 and RS-422, making it suitable for a variety of applications requiring balanced data transmission. The device operates from a single 5 V power supply and features a BiCMOS process that combines low power CMOS with fast switching bipolar technology.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC | -0.3 to +7 | V | |
| Driver Input (DI) | -0.3 to VCC + 0.3 | V | |
| Control Inputs (DE, RE) | -0.3 to VCC + 0.3 | V | |
| Receiver Inputs (A, B) | -9 to +14 | V | |
| Driver Outputs (A, B) | -9 to +14 | V | |
| Receiver Output | -0.5 to VCC + 0.5 | V | |
| Data Rate | 5 Mbps | ||
| Driver Propagation Delay | 10 ns (typical) | ns | |
| Receiver Propagation Delay | 15 ns (typical) | ns | |
| Bus Common-Mode Range | -7 to +12 | V | |
| Power Dissipation | 900 mW (8-Lead MSOP) | mW | |
| Thermal Impedance (θJA) | 206°C/W | °C/W |
Key Features
- Meets EIA RS-485 and RS-422 standards
- Single 5 V power supply
- High speed, low power BiCMOS technology
- Thermal shutdown protection and short-circuit protection
- High-Z outputs when disabled or powered off
- Fail-safe receiver inputs ensuring a logic high output state if inputs are unconnected
- Up to 32 transceivers can be connected on a bus, with only one driver enabled at a time
- ESD protection on all inputs and outputs
Applications
- Low power RS-485 systems
- DTE/DCE interface
- Packet switching
- Local area networks (LANs)
- Data concentration
- Data multiplexers
- Integrated services digital network (ISDN)
Q & A
- What are the main standards that the ADM485JRZ-REEL7 complies with?
The ADM485JRZ-REEL7 complies with EIA standards RS-485 and RS-422. - What is the operating voltage of the ADM485JRZ-REEL7?
The device operates from a single 5 V power supply. - What is the maximum data rate supported by the ADM485JRZ-REEL7?
The maximum data rate supported is 5 Mbps. - What protection features does the ADM485JRZ-REEL7 have?
The device features thermal shutdown protection and short-circuit protection. - How many transceivers can be connected on a bus?
Up to 32 transceivers can be connected on a bus, with only one driver enabled at a time. - What happens to the receiver outputs if the inputs are unconnected?
The receiver outputs will be in a logic high state if the inputs are unconnected due to the fail-safe feature. - What is the common-mode voltage range of the bus?
The bus common-mode voltage range is -7 V to +12 V. - Does the ADM485JRZ-REEL7 have ESD protection?
Yes, all inputs and outputs have ESD protection. - What is the thermal shutdown temperature for the driver outputs?
The driver outputs are disabled at a die temperature of 150°C and re-enabled at 140°C. - What is the typical propagation delay for the driver and receiver?
The typical driver propagation delay is 10 ns, and the typical receiver propagation delay is 15 ns.
