Evaluates: MAX14940/MAX14943/
MAX14946/MAX14949
MAX149X2 Evaluation Kit
General Description
Quick Start
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.
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:
The MAX149X2 EV kit comes with the MAX14943GWE+
installed, but can also be used to evaluate the pin-compatible
MAX14940, MAX14946, and MAX14949 ICs.
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.
Features
● Operates from a Single 3.3V Supply
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.
● Terminal Block Connectors for Easy RS-485/
PROFIBUS Evaluation
● 5000V
Isolation for 60s
RMS
● Fully Assembled and Tested
● Proven PCB Layout
Ordering Information appears at end of data sheet.
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
1-2
2-3*
Receiver is disabled. RXD is high impedance.
J1
Receiver is enabled. RXD is active.
1-2*
Driver is enabled. DEM is high.
J2
J3
2-3
Driver is disabled. DEM is low.
Open*
Closed
Open*
Closed
DE and RE are not connected together.
DE and RE are connected together.
A and B are not connected through the on-board 120Ω resistor.
Connects the on-board 120Ω resistor between A and B.
J4
*Default position.
19-7646; Rev 0; 6/15