Click here for production status of specific part numbers. Evaluates: MAX40026 MAX40026 Evaluation Kit General Description Quick Start The MAX40026 evaluation kit (EV kit) is a fully assembled Required Equipment electrical demonstration kit that provides a proven design MAX40026 EV kit to evaluate the MAX40026 ultra-low 280ps propagation 6 matched-length SMA cables (preferably up to delay, ultra-low dispersion comparator with 2mV hysteresis. 18GHz capable), 2 feet, or less, in length The board provides layout options that allow the input termination to be easily modified for alternative input +3.6V, 100mA DC power supply (V ) CC terminations. The comparator outputs are designed High-Speed signal generator with differential outputs to drive low voltage differential signal outputs (LVDS). capable of generating square waves with <500ps rise The LVDS outputs help minimize power dissipation and times. (Eg., HP8131A) interfaces directly with high speed interconnect devices, High-speed oscilloscope with 50 termination FPGAs and CPU. The MAX40026 comparator is ideal for time of flight distance measurement applications. Procedure This EV kit demonstrates the MAX40026ATA/VY+ in an The MAX40026 EV kit is fully assembled and tested. 8-pin TDFN package. Follow the steps below to verify board operation. Caution: Do not turn on power supply until all connec- Features tions are completed. Fast Propagation Delay: 280ps typ 1) Set the V power supply to +3.3V. Disable V . CC CC Low Overdrive Dispersion: 25ps (V = 10mV to 100mV) OV 2) Connect the negative terminal of the V power CC Supply Voltage 2.7V to 3.6V supply to the GND pad. Connect the positive terminal 39.4mW at 2.7V Supply of the V power supply to the V1 SUPPLY pad. CC Power-Efficient LVDS Outputs 3) Set the signal generator to produce an output square-wave signal of 100mV differential at a P-P -40C to +125C Temperature Range frequency of 250MHz with common mode of +2.5V. Disable the signal generator outputs. Ordering Information appears at end of data sheet. MAX40026 EV Kit Photo 319-100332 Rev 0 3/19MAX40026 Evaluation Kit Evaluates: MAX40026 4) Connect the signal generator differential outputs to When connecting the outputs to an LVDS device such as the edge-mount SMA connector marked INA+ INPUT/ an FPGA, replace the AC coupling capacitors C3 and C4 J5 and INA- INPUT/J6. with 0 shorts and R4 populated with 100 termination resistor. 5) Enable all power supply. Enable the signal generator. 6) Verify if the supply current is within 5% of 17mA Input and Output Termination 7) Monitor and verify inputs IN+ 50/J1 and IN- 50/J2 with Input Termination the oscilloscope. The oscilloscope must be configured Terminating Inputs with a 50 Oscilloscope for 50 input termination. By default, the EV kit is designed to terminate the inputs 8) Monitor and verify outputs OUT+/J3 and OUT-/J4 with when 50 oscilloscope probes are connected to IN+ 50 the oscilloscope. The oscilloscope must be config - and IN- 50 termination SMA edge connectors. When ured for 50 input termination. inputs from a signal generator are connected to IN+ and IN- SMA connector inputs, IN+ 50 and IN- 50 are used Detailed Description of Hardware to terminate the input signals with a 50 oscilloscope. The MAX40026EV kit provides a proven design to evalu- This enables the input signals to be observed at the ate MAX40026 comparator. The device offers ultra-low oscilloscope and at the same time terminates the 280ps propagation delay, ultra-low dispersion of 25ps and micro-strip line. During this condition. Populate R5, R2, 1.5mV hysteresis. R6, and R3 with 0 resistors when operating this way. Supply Voltage When a 50 Oscilloscope is Not Terminated at Inputs The MAX40026 EV kit operates from standard supply When inputs from a signal generator are connected to levels +2.7V to +3.6V. Connect the positive and negative IN+ and IN- SMA connectors and when it is not desired supply voltages (ground return) to V1 SUPPLY and GND to terminate the inputs to a scope, then the 0 resistor at pads, respectively. R2 and R3 resistors must be de-populated and the 100 termination resistor must be populated at R1. Inputs The MAX40026 EV kit provides an efficient and simple This is helpful when high-speed devices (TIAs, differential method to evaluate the comparator. The inputs to the amplifiers) connect directly to the inputs of MAX40026 for device are from IN+ and IN- SMA connectors. IN+ 50 signal discrimination. and V1 SUPPLY SMA connectors serve as terminating Output Termination leads at the input when using an oscilloscope to terminate and observe the input signal. During this condition R1 Terminating Outputs with a 50 Oscilloscope is not populated. When not using IN+ 50 and IN- 50 By default, the EV kit is designed to terminate the outputs SMA connectors, R1 should be populated with 100. The when a 50 oscilloscope is connected to the OUT+ and differential inputs accept input signals in the common OUT- SMAs. C3 and C4 AC coupling capacitors facilitates mode range from +1.5V to V + 0.1V. CC the outputs to the 50 oscilloscope inputs. R4 termination resistor is not populated in this case. Outputs OUT+ and OUT- SMA connectors access the MAX40026 When a 50 Oscilloscope is Not Terminated at Inputs outputs. Both OUT+ and OUT- output traces are in When interconnecting to a subsequent high-speed device default AC- coupled for easy and simple evaluation when designed to accept LVDS inputs, then C3 and C4 capacitors connecting to 50 terminated oscilloscope. The outputs must be replaced with 0 resistor shorts and R4 resistor OUT+ and OUT- are 50 single ended characteristic lines must be populated with 100 termination. either terminated by an oscilloscope or a subsequent high-speed device. The outputs are LVDS levels. When terminating with a scope, the outputs are AC coupled. Maxim Integrated 2 www.maximintegrated.com