Overview
The ADM1491EBRZ, produced by Analog Devices Inc., is a high-speed, full-duplex RS-485 transceiver designed for balanced transmission lines and compliant with the TIA/EIA-485-A-98 standard. This device is optimized for motor control applications and other scenarios requiring high data rates up to 16 Mbps. It features robust protection mechanisms, including electrostatic discharge (ESD) protection up to ±8 kV using the human body model (HBM), and short-circuit protection to prevent excessive power dissipation. The ADM1491EBRZ operates from a single 5 V power supply and is available in various package options, including narrow body SOIC and MSOP packages.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Maximum Data Rate | - | - | 16 Mbps | - | - |
| Propagation Delay (tDPLH, tDPHL) | 11 | 17 | ns | RL = 54 Ω, CL = 100 pF | |
| Driver Output Skew (tSKEW) | 0.5 | 2 | ns | RL = 54 Ω, CL = 100 pF | |
| Rise Time/Fall Time (tDR, tDF) | 8 | 15 | ns | RL = 54 Ω, CL = 100 pF | |
| Enable Time (tZH, tZL) | - | 20 | ns | - | |
| Receiver Input Impedance | - | - | 12 kΩ | - | |
| Short-Circuit Current | - | - | ±250 mA | Fault conditions | |
| Thermal Shutdown Temperature | - | - | 150°C | - |
Key Features
- High-speed, full-duplex RS-485 transceiver with data rates up to 16 Mbps.
- Compliant with TIA/EIA-485-A-98 standard for balanced transmission lines.
- ESD protection up to ±8 kV using the human body model (HBM).
- Short-circuit protection and thermal shutdown circuitry to prevent excessive power dissipation.
- Fail-safe feature in the receiver that results in a logic high output state if the inputs are unconnected (floating).
- Low propagation delay and minimal driver skew to minimize EMI interference.
- Single 5 V power supply operation.
- Available in narrow body SOIC and MSOP packages.
Applications
- Motor control applications requiring high-speed communications.
- Multipoint data transmission systems.
- Industrial automation and control systems.
- High-speed data transmission in harsh environments.
- Full-duplex communication systems where robust ESD protection and low EMI are critical.
Q & A
- What is the maximum data rate supported by the ADM1491EBRZ?
The ADM1491EBRZ supports data rates up to 16 Mbps.
- What is the ESD protection level of the ADM1491EBRZ?
The ADM1491EBRZ has ESD protection up to ±8 kV using the human body model (HBM).
- What types of packages are available for the ADM1491EBRZ?
The ADM1491EBRZ is available in narrow body SOIC and MSOP packages.
- What is the power supply voltage for the ADM1491EBRZ?
The ADM1491EBRZ operates from a single 5 V power supply.
- What is the receiver input impedance of the ADM1491EBRZ?
The receiver input impedance is 12 kΩ, allowing up to 32 nodes on the bus.
- Does the ADM1491EBRZ have short-circuit protection?
Yes, the ADM1491EBRZ has short-circuit protection that limits the maximum output current to ±250 mA during fault conditions.
- What is the thermal shutdown temperature for the ADM1491EBRZ?
The thermal shutdown temperature is 150°C, which forces the driver outputs into a high impedance state if exceeded.
- Is the ADM1491EBRZ suitable for full-duplex communication?
Yes, the ADM1491EBRZ is designed for full-duplex communication.
- What is the fail-safe feature in the receiver of the ADM1491EBRZ?
The receiver has a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
- Does the ADM1491EBRZ minimize EMI interference?
Yes, the ADM1491EBRZ has low propagation delay and minimal driver skew to minimize EMI interference.
