Overview
The ADM2487EBRWZ is a high-performance, isolated RS-485/RS-422 transceiver produced by Analog Devices Inc. This device integrates a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package, utilizing Analog Devices' iCoupler® technology. It is designed to provide reliable and isolated communication over balanced transmission lines, complying with TIA/EIA-485-A-98 and ISO 8482:1987(E) standards.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions |
|---|---|---|---|---|---|
| Differential Output Voltage (Loaded) | 1.5 | 5.0 | V | RL = 54 Ω (RS-485), see Figure 19 | |
| Propagation Delay (Driver) | 110 ns | CL = 15 pF, see Figure 23 and Figure 27 | |||
| Rise Time/Fall Time (Driver) | 15 ns | RDIFF = 54 Ω, CL = 100 pF, see Figure 21 and Figure 26 | |||
| Enable Time (Driver) | 120 ns | RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 28 | |||
| Disable Time (Driver) | 150 ns | RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 28 | |||
| Power Supply Current (Bus Side) | 17 mA | 40 mA | VDD2 = 3.6 V, half-duplex configuration, RTERMINATION = 120 Ω, see Figure 25 | ||
| Isolation Voltage | 2500 Vrms | ||||
| ESD Protection | ±15 kV | On RS-485 input/output pins |
Key Features
- Isolated RS-485/RS-422 transceivers, configurable as half duplex or full duplex.
- Integrated oscillator driver for external transformer.
- ±15 kV ESD protection on RS-485 input/output pins.
- Thermal shutdown circuitry to protect against excessive power dissipation.
- Logic side powered with either 5 V or 3.3 V supply, and bus side powered with an isolated 3.3 V supply.
- Active high enable for the driver and active low enable for the receiver.
- Compliance with TIA/EIA-485-A-98 and ISO 8482:1987(E) standards.
Applications
- Industrial automation and control systems.
- Building automation and HVAC systems.
- Medical devices requiring isolation for safety.
- Aerospace and defense applications where high reliability is crucial.
- Any system requiring isolated communication over RS-485 or RS-422 interfaces.
Q & A
- What is the isolation voltage of the ADM2487EBRWZ?
The isolation voltage is 2500 Vrms.
- What are the power supply options for the logic side of the device?
The logic side can be powered with either a 5 V or a 3.3 V supply.
- What is the maximum data rate supported by the ADM2487EBRWZ?
The maximum data rate supported is 500 kbps.
- Does the ADM2487EBRWZ have ESD protection?
Yes, it has ±15 kV ESD protection on RS-485 input/output pins.
- What is the package type of the ADM2487EBRWZ?
The device is packaged in a 16-pin SOIC (0.295", 7.50mm Width).
- Does the ADM2487EBRWZ support thermal shutdown?
Yes, it includes thermal shutdown circuitry to protect against excessive power dissipation.
- What are the enable/disable times for the driver?
The enable time is 120 ns, and the disable time is 150 ns.
- What is the propagation delay for the receiver?
The propagation delay for the receiver is 110 ns.
- Is the ADM2487EBRWZ compliant with any industry standards?
Yes, it complies with TIA/EIA-485-A-98 and ISO 8482:1987(E) standards.
- What is the typical power supply current for the bus side?
The typical power supply current for the bus side is 17 mA to 40 mA depending on the configuration and data rate.
