Click here for production status of specific part numbers. Evaluates: MAX49140 MAX49140 Evaluation Kit General Description Quick Start The MAX49140 evaluation kit (EV kit) is a fully assembled Required Equipment and tested circuit board that evaluates the MAX49140 MAX49140 EV kit 30ns, rail-to-rail single supply comparator. 2.7V to 5.5V, 100mA DC power supply The MAX49140 EV kit comes with a MAX49140AXK/V+ Two precision voltage calibrators installed that operates off a V supply between 2.7V DD and 5.5V. The MAX49140AXK/V+ is fully specified over Two multimeters -40C to +125C automotive temperature range and is Procedure AEC-Q100 qualified. The EV kit is fully assembled and tested. Follow the steps Features below to verify board operation before exercising the full features of the MAX49140 devices: Fast, 30ns Propagation Delay (10mV Overdrive) 1) Set the DC power supply output to 5V. Disable the Low Power 100A Supply Current (V = 3V) DD output. Optimized for 3V and 5V Applications 2) Verify that all components except R1/R2/R3 are Rail-to-Rail Input Voltage Range properly installed. Low, 500V Offset Voltage 3) Connect the 5V supply positive terminal to V DD Internal Hysteresis for Clean Switching test point on the EV kit. Use the first multimeter to measure the supply current (set the multimeter to Output Swing 300mV of Power Rails measure A current). CMOS/TTL-Compatible Outputs 4) Connect the 5V supply ground terminal to GND test Small SC70 Package point on the EV kit. AEC-Q100 Qualified 5) Connect the second multimeter to measure the Proven PCB Layout voltage on OUT test point on the EV kit. Fully Assembled and Tested 6) Connect the first calibrator output (set to 0.5V) to IN P test point on the EV kit. Disable the output. 7) Connect the second calibrator output (set to 0.1V) IN N test point on the EV kit. Disable the output. 8) Enable the power supply. 9) Enable all the calibrators. Ordering Information appears at end of data sheet. 10) Verify that the first multimeter reads less than 180A. 11) Verify that the second multimeter reads 5V 0.3V. 12) Disable the calibrators. 13) Disable the power supply output. 14) Set the first calibrator to 0.1V. 15) Set the second calibrator to 0.5V. 16) Enable the power supply output. 17) Enable the calibrators. 18) Verify that the first multimeter reads less than 180A. 19) Verify that the second multimeter reads 0V 0.3V. 319-100518 Rev 0 4/20MAX49140 Evaluation Kit Evaluates: MAX49140 Add Extra Input Hysteresis Detailed Description of Hardware The MAX49140 has a built-in hysteresis of 1.2mV typi- The MAX49140 EV kit provides a proven layout for the cal. If the environment noise or signal noise is large, the MAX49140. The MAX49140 EV kit by default comes with output may oscillate when the input differential voltage the MAX49140 IC, which is a 30ns, rail-to-rail single sup- is around the hysteresis. To avoid this issue, the EV kit ply comparator in 5-pin SC70 package. The EV kit oper- allows users to add extra hysteresis in addition to the ates from a single 2.7V to 5.5V DC power supply. 1.2mV internal hysteresis by adding a positive feedback circuit. R3 and R4 pads are provided for this purpose. The extra hysteresis added is given by the equation below (assuming the high output is close to V ) and low output DD is close to ground): HYSTERESIS = (R3/R4) x V DD Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION GND 1 Black test point 0.1F 10%, 50V X7R ceramic C1 1 capacitor (0603) IN P, IN N, 3 White test points Murata GCJ188R71H104KA12 OUT R1, R2, R3 0 Not installed, 0603 resistors 1F 10%, 50V X7R ceramic capacitor (0603) R4 1 0 5% resistor (0603) C2 1 TAIYO YUDEN UMK107AB- U1 1 MAX49140AXK/V+ 7105KA V 1 Red test point DD Ordering Information PART TYPE MAX49140EVKIT EV Kit Denotes RoHS compliance. Maxim Integrated 2 www.maximintegrated.com