Overview
The ADM2865EBRNZ-RL7 from Analog Devices Inc. is a 5.7 kV rms signal and power isolated RS-485 transceiver designed for balanced transmission lines. This device complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E) standards, making it suitable for various industrial and commercial applications. It features an integrated, low EMI isolated dc-to-dc converter, which eliminates the need for an external isolated power supply, simplifying system design and reducing overall cost. The ADM2865EBRNZ-RL7 also includes robust ESD protection and a cable invert smart feature to correct reversed cable connections while maintaining full receiver fail-safe performance.
Key Specifications
| Parameter | Value |
|---|---|
| Package/Case | SOIC-28 |
| Function | Transceiver |
| Number of Drivers | 1 Driver |
| Number of Receivers | 1 Receiver |
| Duplex | Half Duplex |
| Supply Voltage - Max | 5.5 V |
| Supply Voltage - Min | 3 V |
| Operating Supply Current | 28 mA |
| Minimum Operating Temperature | -40°C |
| Maximum Operating Temperature | +105°C |
| ESD Protection | ±15 kV IEC61000-4-2 air discharge |
| Data Rate | 25 Mb/s (high speed), 500 kbps (low speed for EMI control) |
| Logic VIO Supply | 1.7 V to 5.5 V |
| VSEL Pin | Select VISO supply of 5 V (VCC > 4.5 V) or 3.3 V |
| Propagation Delay Time | 18 ns, 32 ns |
| Common-Mode Transient Immunity | 250 kV/µs |
Key Features
- 5.7 kV rms isolated RS-485/RS-422 transceiver
- Low radiated emissions, integrated, isolated dc-to-dc converter
- Passes EN 55032 Class B with margin on a 2-layer PCB
- Cable invert smart feature to correct reversed cable connections while maintaining full receiver fail-safe performance
- ESD protection on RS-485 A, B, Y, and Z pins: ≥±12 kV IEC61000-4-2 contact discharge and ≥±15 kV IEC61000-4-2 air discharge
- High speed 25 Mbps data rate (ADM2865E/ADM2867E) and low speed 500 kbps data rate for EMI control (ADM2861E/ADM2863E)
- Flexible power supplies: Input VCC supply of 3 V to 5.5 V and logic VIO supply of 1.7 V to 5.5 V
- VSEL pin to select VISO supply of 5 V (VCC > 4.5 V) or 3.3 V
- Wide operating temperature range: −40°C to +105°C
- High common-mode transient immunity: 250 kV/µs
- Short-circuit, open-circuit, and floating input receiver fail-safe
- Full hot swap support (glitch free power-up/power-down)
Applications
- Heating, ventilation, and air conditioning (HVAC) networks
- Industrial field buses
- Building automation
- Utility networks
- Energy meters
Q & A
- What is the primary function of the ADM2865EBRNZ-RL7?
The ADM2865EBRNZ-RL7 is a 5.7 kV rms signal and power isolated RS-485 transceiver designed for balanced transmission lines.
- What standards does the ADM2865EBRNZ-RL7 comply with?
The device complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E) standards.
- What is the significance of the integrated dc-to-dc converter in the ADM2865EBRNZ-RL7?
The integrated dc-to-dc converter eliminates the need for an external isolated power supply, simplifying system design and reducing overall cost.
- What ESD protection does the ADM2865EBRNZ-RL7 offer?
The device features ≥±12 kV IEC61000-4-2 contact discharge and ≥±15 kV IEC61000-4-2 air discharge ESD protection on the RS-485 A, B, Y, and Z pins.
- What is the cable invert smart feature in the ADM2865EBRNZ-RL7?
The cable invert smart feature corrects reversed cable connections on A, B, Y, and Z bus pins while maintaining full receiver fail-safe performance.
- What are the operating temperature ranges of the ADM2865EBRNZ-RL7?
The device operates over a temperature range of −40°C to +105°C.
- What data rates does the ADM2865EBRNZ-RL7 support?
The device supports high speed 25 Mbps data rate and low speed 500 kbps data rate for EMI control.
- What is the common-mode transient immunity of the ADM2865EBRNZ-RL7?
The device has a high common-mode transient immunity of 250 kV/µs.
- Does the ADM2865EBRNZ-RL7 support hot swap operations?
Yes, the device supports full hot swap operations (glitch free power-up/power-down).
- What are some typical applications of the ADM2865EBRNZ-RL7?
Typical applications include HVAC networks, industrial field buses, building automation, utility networks, and energy meters.
