19-2364; Rev 0; 3/02 MAX3272 Evaluation Kit Features ♦ Single +3.3V Power Supply ♦ Fully Assembled and Tested ♦ Includes Calibration Strip for Accurate Measurements ♦ EV Kit Designed for 50Ω Interfaces ♦ Easy LOS Threshold Programming ♦ Easy Output Polarity Control Component List DESIGNATION QTY C1 1 33µF ±10% tantalum capacitor C2 1 2.2µF ±10% tantalum capacitor C3, C16 2 0.1µF ±10% ceramic capacitors (0402) C4–C7 4 1000pF ±10% ceramic capacitors (0402) C8–C15, C17 9 0.01µF ±10% ceramic capacitors (0402) Ordering Information DESCRIPTION R1, R2 2 4.75kΩ ±1% resistors (0402) R3 1 20kΩ potentiometer R4 1 2kΩ potentiometer L1 1 56nH inductor Coilcraft 0805CS-560XKBC U1 1 MAX3272EGP 20-QFN* J1–J8 8 SMA connectors, edge mount (round contact) PART TEMP RANGE IC PACKAGE MAX3272EVKIT -40°C to +85°C 20 QFN Component Suppliers SUPPLIER PHONE FAX AVX 843-448-9411 843-448-1943 Coilcraft 847-639-6400 847-639-1469 Murata 814-237-1431 814-238-0490 Venkel 800-950-8365 512-794-0087 Note: Please indicate that you are using the MAX3272 when ordering from these suppliers. Quick Start J9, J10, J11 3 1 × 3-pin headers (0.1in centers) 1) Connect a shunt across pins 1 (VCC) and 2 of jumper J9 for no inversion in the output polarity. J12, J13 2 1 × 2-pin headers (0.1in centers) 2) Ensure that J13 is open. J14, J15, TP1, TP2 4 Test points 3) Connect OUT+ and OUT- to a 50Ω terminated oscilloscope. None 1 MAX3272 evaluation circuit board, rev A 4) Apply a differential input (15mVP-P to 1200mVP-P) between IN+ and IN-. None 1 MAX3272 data sheet 5) Connect a +3.3V power supply to J14 (VCC), then connect the power-supply ground to J15 (GND). *Note: U1 has an exposed pad that requires that it be solder attached to the circuit board to ensure proper functionality of the part. 6) Adjust the LOS threshold with R3 and R4. 7) The output amplitude is approximately 750mV. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX3272 General Description The MAX3272 evaluation kit (EV kit) is fully assembled and tested to provide easy evaluation of the MAX3272 3.3V, 2.5Gbps low-power limiting amplifier. The EV kit also includes a calibration strip to enable accurate jitter and edge speed measurements. Evaluates: MAX3272 MAX3272 Evaluation Kit Detailed Description LOS Threshold Adjustment Potentiometers R3 and R4 program the LOS assert threshold. Refer to the MAX3272 data sheet for details on setting the threshold. Setting the Offset Correction Capacitor Jumper J10 sets the offset correction loop capacitor. Short pins 1 and 2 to set CAZ = 0.1µF; short pins 2 and 3 to disable the offset correction loop. Leave J10 unconnected for a higher cutoff frequency. Refer to the MAX3272 data sheet for details. Setting the Output Polarity Jumper J9 sets the output polarity. Short pins 1 (VCC) and 2 for no signal inversion, or short pins 2 and 3 (GND) for an inversion in output polarity. Setting the Output Current Jumper J13 sets the output current level. For 16mA CML output current, leave this jumper open. For approximately 20mA, short the jumper. Setting the LOS Capacitor Jumper J12 sets the LOS time constant capacitor. To connect a 0.01µF capacitor, short the jumper. For a shorter time constant (about 2µs), leave the jumper open. LOS Test Point Test point 1 is used to probe the LOS voltage. This pin should indicate high (≥2.4V) when loss-of-signal is detected, and indicate low (≤0.4V) in normal operation. LOS Test Point Test point 2 is used to probe the LOS voltage. This pin should indicate low (≤0.4V) when loss-of-signal is detected, and indicate high (≥2.4V) in normal operation. Setting the Squelch Function Jumper J11 controls the squelch function. To enable squelch, short pins 1 (VCC) and 2. To disable, short pins 2 and 3 (GND) or leave unconnected. 2 _______________________________________________________________________________________ MAX3272 Evaluation Kit Evaluates: MAX3272 VCC VCC J14 J15 VCC L1 56nH C1 33µF C2 2.2µF VCC C4 1000pF C3 0.1µF OUTPOL CAZ C16 0.1µF J10 J9 GND VCC VCC IN+ INC9 0.01µF J6 CAZ2 GND OUTPOL C7 1000pF VCC GND C8 0.01µF J5 CAZ1 IN+ U1 OUT+ IN- MAX3272 OUT- GND VCC VCC TH C11 0.01µF OUT+ J7 OUTC10 0.01µF J8 LEVEL VCC CLOS SQUELCH LOS VCC LOS J13 LEVEL C6 1000pF TP1 R3 20kΩ TP2 C5 1000pF J12 R4 2kΩ C17 0.01µF CLOS R1 4.75kΩ R2 VCC 4.75kΩ VCC J11 SQUELCH J1 C12 0.01µF C14 0.01µF J3 J2 C13 0.01µF C15 0.01µF J4 Figure 1. MAX3272 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3272 MAX3272 Evaluation Kit 2.7in, 68.6mm 1.45in, 36.8mm Figure 2. MAX3272 EV Kit Component Placement Guide—Component Side 4 _______________________________________________________________________________________ MAX3272 Evaluation Kit 2.7in, 68.6mm 2.7in, 68.6mm Evaluates: MAX3272 1.45in, 36.8mm 1.45in, 36.8mm Figure 3. MAX3272 EV Kit PC Board Layout—Component Side Figure 4. MAX3272 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 5 1.45in, 36.8mm 2.7in, 68.6mm 1.45in, 36.8mm 2.7in, 68.6mm Evaluates: MAX3272 MAX3272 Evaluation Kit Figure 5. MAX3272 EV Kit PC Board Layout—Ground Plane Figure 6. MAX3272 EV Kit PC Board Layout—Power Plane Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.