Click here for production status of specific part numbers. Evaluates: MAX40025A MAX40025 Evaluation Kit MAX40025C General Description Quick Start The MAX40025 evaluation kit (EV kit) is a fully assembled Required Equipment electrical demonstration kit that provides a proven design MAX40025 EV kit to evaluate the MAX40025 ultra-low 280ps propagation 6 matched-length SMA cables (preferably up to delay, ultra-low dispersion comparator. The board 18GHz capable), 2 feet, or less, in length provides layout options that allow the input termination to be easily modified for alternative input terminations. The +3.6V, 100mA DC power supply (V /+SUPPLY) CC comparator outputs are designed to drive low voltage High-speed signal generator with differential outputs differential signal outputs (LVDS). The LVDS outputs help capable of generating square waves with < 500ps minimize power dissipation and interfaces directly with rise times. (e.g., HP 8131A) high speed interconnect devices, FPGAs and CPUs. The High-speed oscilloscope with 50 termination MAX40025 comparator is ideal for time of flight distance measurement applications. Procedure This evaluation kit demonstrates the MAX40025CAWT+ in The MAX40025 EV kit is fully assembled and tested. 6-pin wafer-level package (WLP). For other available pin- Follow the steps below to verify board operation. compatible option (MAX40025AAWT+), contact factory. Caution: Do not turn on power supply until all connections are completed. Features 1) Set the V power supply to +3.3V. Disable V . CC CC Fast Propagation Delay: 280ps (Typ) 2) Connect the negative terminal of the V power supply CC Low Over-Drive Dispersion: 25ps to the GND pad. Connect the positive terminal of the (V = 20mV to 100mV) OV V power supply to the +SUPPLY pad. CC Supply Voltage 2.7V to 3.6V 3) Set the signal generator to produce an output square-wave signal of 100mV differential at a P-P 39.4mW at 2.7V Supply frequency of 250MHz with a common mode voltage Power-Efficient LVDS Outputs of +2.5V. Disable the signal generator outputs. -40C to +125C Temperature Range Ordering Information appears at end of data sheet. MAX40025 EV Kit Photo 319-100306 Rev 3 5/19MAX40025 Evaluation Kit Evaluates: MAX40025A MAX40025C 4) Connect the signal generator differential outputs to the Input and Output Termination edge-mount SMA connector marked INA+ and INA-. Input Termination 5) Enable power supply. Enable the signal generator. 6) Verify that the supply current is within 5% of 17mA Terminating Inputs with a 50 Oscilloscope 7) Monitor and verify inputs IN+ TERM and IN- TERM By default, the EV kit is designed to terminate the inputs with the oscilloscope. The oscilloscope must be when 50 oscilloscope probes are connected to the IN+ configured for 50 input termination. TERM and IN- TERM termination SMA edge connectors. 8) Monitor and verify outputs OUT+ and OUT- with the When inputs from a signal generator are connected to oscilloscope. The oscilloscope must be configured the IN+ and IN- SMA connector inputs, IN+ TERM and for 50 input termination. IN- TERM are used to terminate the input signals with a 50 oscilloscope. This enables the input signals to Detailed Description of Hardware be observed at the oscilloscope and at the same time The MAX40025 EV kit provides a proven design to evaluate terminates the micro-strip line. Populate R5, R2, R6, and MAX40025 comparator. The device offers ultra-low 280ps R3 resistors with 0 resistors when operating this way. propagation delay, ultra-low dispersion of 25ps. When a 50 Oscilloscope is Not Supply Voltage Terminated at Inputs The MAX40025 EV kit operates from standard supply When inputs from a signal generator are connected to the 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 +SUPPLY and GND pads, to terminate the inputs to a scope, then the 0 resistor at respectively. R2 and R3 resistors must be de-populated and the 100 termination resistor must be populated at R1. Inputs This is helpful when high-speed devices (TIAs, differential The MAX40025 EV kit provides an efficient and simple amplifiers) connect directly to the inputs of MAX40025 for method to evaluate the comparator. The inputs to the signal discrimination. device are from IN+ and IN- SMA connectors. IN+ TERM and IN- TERM SMA connectors serve as terminating Output Termination leads at the input when using an oscilloscope to terminate Terminating Outputs with a 50 Oscilloscope and observe the input signal. During this condition R1 is not populated. When not using IN+ TERM and IN- TERM By default, the EV kit is designed to terminate the outputs 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 couple mode range from +1.5V to V + 0.1V. the outputs to the 50 oscilloscope inputs. R4 termination CC resistor is not populated in this case. Outputs When a 50 Oscilloscope is not OUT+ and OUT- SMA connectors access the MAX40025 terminated at inputs outputs. Both OUT+ and OUT- output traces are in default When connecting to a subsequent high-speed device AC- coupled for easy evaluation when connecting to a designed to accept LVDS inputs, then C3 and C4 50 terminated oscilloscope. The outputs OUT+ and capacitors must be replaced with 0 resistor shorts and OUT- are 50 single-ended characteristic lines either R4 resistor must be populated with 100 termination. 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. When connecting the outputs to an LVDS device such as an FPGA, replace the AC coupling capacitors C3 and C4 with 0 shorts and R4 populated with 100 termination resistor. Maxim Integrated 2 www.maximintegrated.com