Evaluates: MAX14940/MAX14943/

MAX14946/MAX14949

MAX149X2 Evaluation Kit

General Description

The MAX149X2 evaluation kit (EV kit) is a fully assembled

and tested PCB that demonstrates the functionality of the

MAX14943 isolated RS-485/PROFIBUS transceiver. The

EV kit operates from a single 3.3V supply and features an

on-board isolated power supply to power the secondary-

side of the circuit.

The MAX149X2 EV kit comes with the MAX14943GWE+

installed, but can also be used to evaluate the pin-compatible

MAX14940, MAX14946, and MAX14949 ICs.

Features

● Operates from a Single 3.3V Supply

● Terminal Block Connectors for Easy RS-485/

PROFIBUS Evaluation

● 5000VRMS Isolation for 60s

● Fully Assembled and Tested

● Proven PCB Layout

19-7646; Rev 0; 6/15

Ordering Information appears at end of data sheet.

Quick Start

Required Equipment

● MAX149X2 EV kit

● 3.3V, 1A DC power supply

● Signal/function generator

● Oscilloscope

Startup Procedure

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation:

1) Set the DC power supply to 3.3V and connect the

DC power supply between the EV kits VDDA and

GNDA connectors of the EV kit.

2) Ensure that J2 and J3 are in their default positions

(see Table 1).

3) Turn on the power supply.

4) Set the signal/function generator to output a 100kHz

0 to 3V square wave. Note: Set the signal/function

generator to operate with a high-impedance load. If

needed, the R1 pad is available to add a 50Ω impedance

to ground.

5) Connect the signal/function generator to the TXD

test point.

6) Verify that the A and B outputs switch as the signal

toggles.

Table 1. Jumper Settings (J1–J6)

JUMPER

SHUNT POSITION

DESCRIPTION

J1

1-2

Receiver is disabled. RXD is high impedance.

2-3*

Receiver is enabled. RXD is active.

J2

1-2*

Driver is enabled. DEM is high.

2-3

Driver is disabled. DEM is low.

J3

Open*

DE and RE are not connected together.

Closed

DE and RE are connected together.

J4

Open*

A and B are not connected through the on-board 120Ω resistor.

Closed

Connects the on-board 120Ω resistor between A and B.

*Default position.