Analog Devices Inc. ADM256xE Evaluation Boards (EVAL-ADM256xEEBZ)

Analog Devices Inc. ADM256xE Evaluation Boards (EVAL-ADM256xEEBZ) allow simplified, efficient demonstration and evaluation of the ADM256xE Signal and Power Isolated RS-485 Transceivers. The ADM256xE RS-485 Transceivers feature 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 ±12kV contact and ±15kV air IEC61000-4-2 ESD protection on the RS-485 A, B, Y, and Z pins. These devices also feature 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.

The Analog Devices Inc. EVAL-ADM286xEEBZ Evaluation Boards include an onboard ADP7104 low dropout (LDO) regulator, which accepts an input voltage of 3.3V to 20.0V and regulates the voltage to a selectable 3.3V or 5.0V supply for the V_CC pin of the ADM286xE. The LDO regulator can be bypassed to power the V_CC pin of the ADM2867E directly.

A flexible logic V_IO supply allows the device to operate with a digital input/output (I/O) voltage from 1.7V to 5.5V, which enables communication with modern nodes using either a 1.8V or 2.5V power supply. The V_IO pin can also be supplied from the ADP7104 regulated supply.

The EVAL-ADM286xEEBZ comes with options to evaluate the ADM2867E in an individual system. Digital and RS-485 bus signals are accessible via the screw terminal blocks on the EVALADM286xEEBZ. Each digital input can be configured via the onboard jumper options.

Alternative methods can provide the transmit data input (TxD) signal to the device. An optional LTC6900 oscillator is included on the EVAL-ADM286xEEBZ and can be configured to provide a clock signal for the TxD digital input. For optimal signal integrity, the onboard SMA connector can be used to connect to an external data signal.

Features

Simplified evaluation of the ADM256xE RS-485 Transceiver
2-layer PCB compliant to EN 55032 Class B radiated emissions
Footprint for 10.15mm × 10.05mm, 28-lead SOIC_W_FP package with >8.0mm creepage and clearance
Onboard ADP7104 LDO regulator with jumper options for simplified evaluation in 5.0V or 3.3V configurations
Flexible, low voltage V_IO supply rail to interface with I/O nodes as low as 1.7V
Selectable 3.3V or 5.0V isolated supply voltage options available

IEC 61000-4-2 ESD protection on the A, B, Y, and Z pins
±12kV contact discharge and ±15kV air discharge
SMA connector for high speed 25Mbps TxD input signal
Optional onboard LTC6900 oscillator to provide TxD input signal
Screw terminal blocks for power connections, digital signals, and RS-485 signals
Jumper-selectable enable and disable for digital input signals
Resistors and footprints for termination and loopback test
Test points to measure all signals