Click here for production status of specific part numbers. Evaluates: MAX22502E/MAX22503E MAX22502E Evaluation Kit Startup Procedure General Description The EV kit is fully assembled and tested. Follow the steps The MAX22502E evaluation kit (EV kit) is a fully assembled below to verify board operation. and tested PCB that demonstrates the functionality of the MAX22502E and the MAX22503E full-duplex high speed 1) Ensure that all jumpers are in their default positions RS-485/RS-422 transceiver. The EV kit includes on-board (see Table 1). termination for easy point-to-point evaluation. The EV kit 2) Set the DC power supply to 5V and connect the DC is assembled using MAX22502E in a 12-pin TDFN pack- power supply to the V test point. Connect the CC age, but also provides equivalent functional evaluation ground terminal of the 5V supply to the GND test for the MAX22503E, which is offered in a 14-pin SOIC point. package. 3) Turn on the power supply. 4) Set the signal/function generator to output a 30MHz Features 0-to-5V square wave. Configurable to Operate from a Single 3V to 5V 5) Connect the signal/function generator to the DI test Supply point. 6) Using the oscilloscope, verify that the Y, Z, and RO Separate Logic Supply (VL) to Interface with Logic Signals as Low as 1.6V outputs switch as the DI signal toggles. Terminal Block and RJ45 Connectors for Easy RS-485/RS-422 Evaluation Fully Assembled and Tested Quick Start Required Equipment MAX22502E EV kit 5V, 500mA DC power supply 80MHz signal/function generator Ordering Information appears at end of data sheet. Oscilloscope 319-100082 Rev 1 5/19Evaluates: MAX22502E/MAX22503E MAX22502E Evaluation Kit Loopback Configuration Detailed Description of Hardware The MAX22502E EV kit is a fully assembled and tested To test the MAX22502E in a loopback configuration, close the J6 and J15 jumpers. J6 connects the A input to the Y circuit board for evaluating the MAX22502E high speed full-duplex RS-485/RS-422 transceiver (U1). The EV kit output. J15 connects the B input to the Z output. can be powered from a single supply and can be used Termination for an End-of-Line Transceiver for standalone evaluation or can be connected (using the The MAX22502E EV kit includes 120 termination resistors on-board terminal block) to an RS-485/RS-422 network between the Y and Z driver outputs (R6) and between the for easy in-system evaluation. The MAX22503E does not A and B receiver inputs (R7) on the MAX22502E. feature preemphasis or have a separate logic supply input pin (V ). To emulate the functional performance of the L Table 1. Jumper Table (J3-J6, J8, J14) MAX22503E set switch SW1 to the OFF position and close the J4 jumper to operate with a single supply voltage. SHUNT JUMPER DESCRIPTION POSITION Powering the Board RE is high. The RS-485 receiver is 1-2 The MAX22502E includes two supplies: VCC and VL, disabled. allowing the device to interface with logic signals as low J3 RE is low. The RS-485 receiver is as 1.6V. To operate the EV kit with a single supply, close 2-3* enabled. the J4 jumper to connect VL to VCC (VL = 5V), to operate VL is not connected to VCC. Connect the EV kit with a single supply. Close the J4 jumper for Open an external supply to VCC and to VL. equivalent functional performance with the MAX22503E. J4 Closed* VL is connected to VCC. Open the J4 jumper and connect a separate logic supply to the VL testpoint (TP6) to operate with a logic supply DE is high. The RS-485 driver outputs 1-2* that is not equal to the VCC voltage. are enabled. J5 Ensure that VCC = 5V, when operating the EV kit with DE is low. The RS-485 driver outputs 2-3 preemphasis enabled. When preemphasis is disabled, are disabled. connect a supply voltage between 3V and 5V to VCC. Open A is not connected to Y. J6 Driver and Receiver Enable Closed* A is connected to Y. The EV kit features three jumpers (J3, J5, and J8) to Open* DE and RE are not connected together. enable/disable the driver and receiver outputs. Set J3 to J8 Closed DE and RE are connected together. low (2-3) to enable the receiver. Set J3 to high (1-2) to enable the driver. Open B is not connected to Z. J15 To actively control both enables, remove the J2 and Closed* B is connected to Z. J3 jumpers and close J8, which connects DE and RE *Default position. together. Setting the Preemphasis (MAX22502E only) Ordering Information The MAX22502E features integrated driver preemphasis circuitry for reliable communication higher data rates over PART TYPE longer distances. Preemphasis is set with by connecting a MAX22502EEVKIT EV Kit resistor between PSET and ground. The MAX22502E EV Denotes RoHS compliant. kit includes a 15k to set the preemphasis for a 30Mbps data rate. Set the switch (SW1) to the ON position to enable preemphasis. To disable preemphasis, set SW1 to the OFF position. Disabling preemphasis and closing the J4 jumper provides equivalent functional performance with the MAX22503E. Maxim Integrated 2 www.maximintegrated.com