Overview
The ADM2795EARWZ-RL7, produced by Analog Devices Inc., is a 5 kV rms signal isolated RS-485 transceiver. This device integrates Analog Devices' iCoupler® technology, combining a 3-channel isolator, an RS-485 transceiver, and IEC electromagnetic compatibility (EMC) transient protection in a single package. It offers robust protection features, including up to ±42 V of ac/dc peak bus overvoltage fault protection and IEC 61000-4-5 Level 4 surge protection up to ±4 kV on the RS-485 bus pins. The device is fully compliant with TIA/EIA RS-485/RS-422 standards and operates over a wide temperature range of −55°C to +125°C.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|---|
| Operating Voltage Range (VDD1) | VDD1 | 1.7 | 5.5 | V | ||
| Operating Voltage Range (VDD2) | VDD2 | 3 | 5.5 | V | ||
| Common-Mode Input Range | VCM | -25 | +25 | V | ||
| Input Current (A, B) | II | -1.0 | +1.0 | mA | DE = 0 V, VDD2 = 0 V/5 V, VIN = ±25 V | |
| Input Capacitance (A, B) | CAB | 150 | pF | TA = 25°C | ||
| Line Input Resistance | RIN | 96 kΩ | -25 V ≤ VCM ≤ +25 V, up to 256 nodes supported | |||
| Output Voltage Low | VOLRxD | 0.2 | V | IORxD = 3.0 mA, VA - VB = -0.2 V | ||
| Output Voltage High | VOHRxD | VDD1 - 0.2 | V | IORxD = -3.0 mA, VA - VB = 0.2 V | ||
| Short-Circuit Current | 100 | mA | VOUT = GND or VDD1, RE = 0 V | |||
| Common-Mode Transient Immunity | 75 | 125 | kV/μs | VCM ≥ 1 kV, transient magnitude ≥ 800 V |
Key Features
- 5 kV rms signal isolation and up to ±42 V of ac/dc peak bus overvoltage fault protection on the RS-485 bus pins.
- IEC 61000-4-5 Level 4 surge protection up to ±4 kV and IEC 61000-4-4 Level 4 EFT protection up to ±2 kV.
- IEC 61000-4-2 Level 4 ESD protection up to ±15 kV on the transceiver interface pins.
- Extended common-mode input range of ±25 V for improved data communication reliability in noisy environments.
- Glitch-free power-up/power-down (hot swap) capability.
- Supports up to 256 bus nodes with 96 kΩ receiver input impedance.
- Operating temperature range of −55°C to +125°C.
- Compliant with TIA/EIA RS-485/RS-422 standards.
Applications
- Heating, ventilation, and air conditioning (HVAC) networks.
- Industrial field buses.
- Building automation.
- Utility networks.
Q & A
- What is the operating voltage range for the ADM2795EARWZ-RL7?
The operating voltage range for VDD1 is 1.7 V to 5.5 V, and for VDD2 it is 3 V to 5.5 V. - What level of surge protection does the ADM2795EARWZ-RL7 offer?
The device offers IEC 61000-4-5 Level 4 surge protection up to ±4 kV on the RS-485 bus pins. - How many bus nodes can the ADM2795EARWZ-RL7 support?
The device can support up to 256 bus nodes with 96 kΩ receiver input impedance. - What is the common-mode input range of the ADM2795EARWZ-RL7?
The common-mode input range is ±25 V. - What are the key protection features of the ADM2795EARWZ-RL7?
The device features up to ±42 V of ac/dc peak bus overvoltage fault protection, IEC 61000-4-5 Level 4 surge protection, IEC 61000-4-4 Level 4 EFT protection, and IEC 61000-4-2 Level 4 ESD protection. - What is the operating temperature range of the ADM2795EARWZ-RL7?
The operating temperature range is −55°C to +125°C. - Is the ADM2795EARWZ-RL7 compliant with any industry standards?
Yes, it is fully compliant with TIA/EIA RS-485/RS-422 standards. - What are some typical applications for the ADM2795EARWZ-RL7?
Typical applications include HVAC networks, industrial field buses, building automation, and utility networks. - Does the ADM2795EARWZ-RL7 support hot swap operations?
Yes, the device has glitch-free power-up/power-down (hot swap) capability. - What is the common-mode transient immunity of the ADM2795EARWZ-RL7?
The device has a common-mode transient immunity of >75 kV/μs.
