Overview
The ADM3493ARZ, produced by Analog Devices Inc., is a low power, differential line transceiver designed to operate using a single 3.3 V power supply. This device is suitable for communication on multipoint bus transmission lines and is particularly ideal for power-sensitive applications due to its low power consumption and shutdown mode. The ADM3493ARZ features a half-duplex configuration, containing one driver and one receiver, and is compliant with EIA RS-422 and RS-485 standards over the full common-mode range.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| Differential Output Voltage (VOD) | 2.0 V | - | - | V | RL = 100 Ω (RS-422), Vcc = 3.3 V ±5% |
| Differential Output Voltage (VOD) | 1.5 V | - | - | V | RL = 54 Ω (RS-485), Vcc = 3.3 V ±5% |
| Data Rate | - | - | 250 kbps | - | - |
| Supply Voltage | 3 V | - | 3.6 V | V | - |
| Operating Temperature | -40°C | - | 85°C | °C | - |
| Bus Common-Mode Range | -7 V | - | 12 V | V | - |
| Receiver Input Impedance | - | 96 kΩ | - | Ω | - |
| Supply Current | - | 1.1 mA | - | mA | - |
| Shutdown Current | - | 2 nA | - | nA | - |
| Package Type | - | - | - | - | 8-lead SOIC |
Key Features
- EIA RS-422 and RS-485 Compliance: The ADM3493ARZ is fully compliant with EIA RS-422 and RS-485 standards over the full common-mode range.
- Half Duplex Transceiver: Designed for half-duplex communication, the device contains one driver and one receiver.
- Slew Rate Limited Driver: The driver features reduced slew rates to minimize EMI and reduce reflections caused by improperly terminated cables.
- Low Power Shutdown Mode: The device can be placed in a low power shutdown mode, drawing only 2 nA of supply current when both the driver and receiver are disabled.
- Thermal Shutdown Circuit: A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or output shorting.
- Fail-Safe Feature: The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
- High Receiver Input Impedance: The receiver input impedance is 96 kΩ, allowing up to 256 transceivers to be connected on the bus.
Applications
- Low Power RS-485 Applications: Ideal for applications where power consumption is a critical factor.
- EMI Sensitive Systems: Suitable for systems that require minimal electromagnetic interference.
- DTE-DCE Interfaces: Used in data terminal equipment to data circuit-terminating equipment interfaces.
- Industrial Control: Applied in industrial control systems for reliable communication.
- Packet Switching: Used in packet switching networks for efficient data transmission.
- Local Area Networks: Suitable for local area network applications requiring reliable and low-power communication.
- Level Translators: Can be used as level translators in various communication systems.
Q & A
- What is the operating voltage range of the ADM3493ARZ?
The ADM3493ARZ operates on a single 3.3 V power supply, with a supply voltage range of 3 V to 3.6 V.
- What is the maximum data rate supported by the ADM3493ARZ?
The ADM3493ARZ supports data rates up to 250 kbps in a half-duplex configuration.
- What is the operating temperature range of the ADM3493ARZ?
The device is specified to operate over a temperature range of -40°C to +85°C.
- How many transceivers can be connected on the bus?
Up to 256 transceivers can be connected on the bus due to the high receiver input impedance of 96 kΩ.
- What is the purpose of the slew rate limited driver in the ADM3493ARZ?
The slew rate limited driver minimizes EMI and reduces reflections caused by improperly terminated cables, ensuring error-free data transmission.
- How does the thermal shutdown circuit work in the ADM3493ARZ?
The thermal shutdown circuit prevents excessive power dissipation by forcing the driver output into a high impedance state if a significant temperature increase is detected during fault conditions.
- What is the supply current in shutdown mode?
In shutdown mode, the ADM3493ARZ typically draws only 2 nA of supply current.
- What package type is the ADM3493ARZ available in?
The ADM3493ARZ is available in an 8-lead SOIC (Small Outline IC) package.
- What is the bus common-mode range of the ADM3493ARZ?
The bus common-mode range is -7 V to +12 V.
- Does the ADM3493ARZ have any fail-safe features?
Yes, the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
