Overview
The ADM3491ARZ-1 is a low-power, differential line transceiver designed by Analog Devices Inc. to operate using a single 3.3 V power supply. This device is optimized for low power consumption and features a shutdown mode, making it ideal for power-sensitive applications. The ADM3491ARZ-1 is suitable for communication on multipoint bus transmission lines and complies with both Electronic Industries Association (EIA) Standards RS-485 and RS-422. It includes a differential line driver and a differential line receiver, enabling full-duplex data transfer.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 3.0 | 3.3 | 3.6 | V | |
| Supply Current (ICC) | 0.84 | 1.0 | 1.5 | mA | Outputs unloaded, DE = VCC, RE = 0 V |
| Shutdown Current | 0.002 | 1 | μA | DE = 0 V, RE = VCC | |
| Differential Output Delay (TDD) | 1 | 15 | 35 | ns | RL = 60 Ω, CL1 = CL2 = 15 pF |
| Differential Output Transition Time | 1 | 8 | 15 | ns | RL = 60 Ω, CL1 = CL2 = 15 pF |
| Input Impedance | 19 | kΩ | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Low power consumption with a supply current of 840 μA and a shutdown current of 2 nA.
- Full-duplex operation with differential line driver and receiver.
- Compliance with EIA Standards RS-485 and RS-422.
- High input impedance of 19 kΩ, allowing up to 50 transceivers on the bus.
- Thermal shutdown circuit to prevent excessive power dissipation.
- Fail-safe feature resulting in a logic high output state if inputs are unconnected.
- Available in PDIP, SOIC, and TSSOP packages.
- Meets IEC1000-4-4 (>1 kV) for ESD protection.
Applications
- Telecommunications: DTE–DCE interface, packet switching.
- Local area networks and data concentration.
- Data multiplexers and integrated services digital network (ISDN).
- AppleTalk and industrial controls.
Q & A
- What is the operating voltage of the ADM3491ARZ-1?
The ADM3491ARZ-1 operates using a single 3.3 V power supply.
- What is the typical supply current of the ADM3491ARZ-1?
The typical supply current is 840 μA.
- What is the shutdown current of the ADM3491ARZ-1?
The shutdown current is typically 2 nA.
- What standards does the ADM3491ARZ-1 comply with?
The ADM3491ARZ-1 complies with EIA Standards RS-485 and RS-422.
- What is the maximum data rate supported by the ADM3491ARZ-1?
The ADM3491ARZ-1 supports data rates up to 20 Mbps.
- What is the input impedance of the receiver?
The input impedance is 19 kΩ.
- What protection features does the ADM3491ARZ-1 have?
The device features thermal shutdown and current limit protection to prevent excessive power dissipation.
- What packages is the ADM3491ARZ-1 available in?
The ADM3491ARZ-1 is available in PDIP, SOIC, and TSSOP packages.
- What is the operating temperature range of the ADM3491ARZ-1?
The operating temperature range is -40°C to +85°C.
- Does the ADM3491ARZ-1 have a fail-safe feature?
Yes, the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected.
