The ADM2861E, ADM2863E, ADM2865E, and ADM2867E are 5.7 kV rms signal and power isolated RS-485 transceivers. These devices are designed for balanced transmission lines and comply with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E). The devices pass radiated emissions testing to the EN 55032 Class B standard with margin on a 2-layer printed circuit board (PCB) using two small external 0402 ferrites on isolated power and ground pins. The device features an integrated, low electromagnetic interference (EMI), isolated dc-to-dc converter, which eliminates the need for an external isolated power supply. The isolation barrier provides immunity to system level electromagnetic compatibility (EMC) standards. The family of isolator devices features ±12 kV contact and ±15 kV air IEC61000-4-2 ESD protection on the RS-485 A, B, Y, and Z pins. The devices also features cable invert pins, allowing the user to quickly correct reversed cable connection on the A, B, Y, and Z bus pins while maintaining full receiver fail-safe performance.

Slew rate limited versions are available, which are optimized for low speed over long cable runs, and have a maximum data rate of 500 kbps. Half duplex and full duplex variants are available. The full duplex generics allow independent cable inversion of the driver and receiver for additional flexibility.

Applications

• Heating, ventilation, and air conditioning (HVAC) networks
• Industrial field buses
• Building automation
• Utility networks
• Energy meters

• 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
  • Correct reversed cable connection on A, B, Y, and Z bus pins while maintaining full receiver fail-safe feature
• ESD protection on RS-485 A, B, Y, and Z pins
  • ≥±12 kV IEC61000-4-2 contact discharge
  • ≥±15 kV IEC61000-4-2 air discharge
• High speed 25 Mbps data rate (ADM2865E/ADM2867E)
• Low speed 500 kbps data rate for EMI control (ADM2861E/ADM2863E)
• Flexible power supplies
  • Input VCC supply of 3 V to 5.5 V
  • 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

• PROFIBUS compliant for 5 V VISO
• 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
• Supports 192 bus nodes (72 kΩ receiver input impedance)
• Full hot swap support (glitch free power-up/power-down)
• Safety and regulatory approvals (pending)
• CSA Component Acceptance Notice 5A, DIN V VDE V 0884-11, UL 1577, CQC11-471543-2012, IEC 61010-1
• Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)
• 28-lead, fine pitch SOIC_W package (10.15 mm × 10.05 mm) with >8.0 mm creepage and clearance

ADM2861EBRNZ，封装：28-Lead SOIC (Wide, Finer Pitch)，包装形式及数量：管装，46，工作温度：-40 to 105C，AD官网报价：6.68（100-499个）；5.8（1000+个）

ADM2861EBRNZ-RL7，封装：28-Lead SOIC (Wide, Finer Pitch)，包装形式及数量：卷带，400，工作温度：-40 to 105C，AD官网报价：6.68（100-499个）；5.8（1000+个）

EVAL-ADM2861E：ADM2861E Evaluation Board

The EVAL-ADM2561EEBZ and the EVAL-ADM2861EEBZ allow the simplified, efficient evaluation of the 3 kV rms ADM2561E and the 5.7 kV rms ADM2861E signal and power, isolated half-duplex RS-485 transceivers, respectively. The ADM2561E and the ADM2861E transceivers are available in a small footprint, 10.15 mm × 10.05 mm, 28-lead, small outline, wide body, with fine pitch (SOIC_W_FP) package. The evaluation boards differ only by the isolated RS-485 device populated on U3.

The ADM2561E and the ADM2861E feature an integrated, isolated, dc-to-dc converter that provides power to the isolated side of the device with no additional ICs required.

An on-board ADP7104 low dropout (LDO) regulator accepts an input voltage of 3.3 V to 20 V and regulates the voltage to a selectable 3.3 V or 5 V supply for the VCC pin of the ADM2561E and the ADM2861E. The LDO regulator can be bypassed to power the VCC pin of the ADM2561E and the ADM2861E directly.

A screw terminal block on the evaluation boards allows connection to the flexible VIO logic supply pin of the ADM2561E/ADM2861E. This connection allows the ADM2561E/ADM2861E to operate with a digital input/output (I/O) voltage from 1.7 V to 5.5 V, which enables communication with nodes using either a 1.8 V or 2.5 V power supply. The VIO pin can also be supplied from the ADP7104 regulated supply.

Digital and RS-485 bus signals are easily accessible via the screw terminal blocks on each evaluation board. Each digital input is configured via the on-board jumper options.

Alternative methods can provide the transmit data input (TxD) signal to the ADM2561E or the ADM2861E. An LTC6900 oscillator is included on each evaluation board and can be optionally configured to provide a clock signal for the TxD digital input within a 1 kHz to 250 kHz range. For optimal signal integrity, use the on-board Subminiature Version A (SMA) connector to connect an external data signal.

For full details on the ADM2561E or the ADM2861E, see the ADM2561E or the ADM2861E data sheet, which must be consulted in conjunction with this user guide when using the EVAL-ADM2561EEBZ and the EVAL-ADM2861EEBZ.