19-3095; Rev 0; 12/03 MAX3272A Evaluation Kit ____________________________Features The MAX3272A evaluation kit (EV Kit) is fully assembled and tested to provide easy evaluation of the MAX3272A +3.3V, 2.5Gbps low power limiting amplifier. The EV Kit also includes a calibration strip for accurate measurements. ♦ Single +3.3V Power Supply ♦ Fully Assembled and Tested ♦ Includes Calibration Strip for Accurate Measurements ♦ EV Kit Designed for 50Ω Ω Interfaces ♦ Easy LOS Threshold Programming ♦ Easy Output Polarity Control ____________________ Component List DESIGNATION QTY DESCRIPTION 33µF ±10% tantalum capacitor ______________ Ordering Information PART MAX3272AEVKIT TEMP RANGE -40°C to +85°C IC PACKAGE 20 QFN C1 1 C2 1 2.2µF ±10% tantalum capacitor C3, C16 2 0.1µF ±10% ceramic capacitors (0402) C4 - C7 4 1000pF ±10% ceramic capacitors (0402) SUPPLIER AVX 843-448-9411 843-448-1943 C8 - C15, C17 9 0.01µF ±10% ceramic capacitors (0402) Coilcraft 847-639-6400 847-639-1469 R1, R2 2 4.75kΩ resistors ±1% (0402) R3 1 20kΩ potentiometer R4 1 2kΩ potentiometer L1 1 56nH inductor Coilcraft 0805CS-560XKBC U1 1 MAX3272AEGP 20-QFN* J1 - J8 8 SMA connectors edge mount (round contact) 1) J9, J10, J11 3 1X3 pin headers (0.1” centers) 2) J12, J13 2 1X2 pin headers (0.1” centers) 3) J14, J15, TP1, TP2 4 Test points 4) None 1 MAX3272A evaluation circuit board, rev A 5) None 1 MAX3272 / MAX3272A data sheet 6) 7) ______________Component Suppliers PHONE FAX Murata 814-237-1431 814-238-0490 Venkel 800-950-8365 512-794-0087 Note: Please indicate that you are using the MAX3272A when ordering from these suppliers. ________________________ Quick Start Connect a shunt across pins 1 (VCC) and 2 of jumper J9 for no inversion in the output polarity. Ensure that J13 is open. Connect OUT+ and OUT- to a 50Ω terminated oscilloscope. Apply a differential input (15mVP-P to 1200mVP-P) between IN+ and IN-. Connect a +3.3V power supply to J14 (VCC), then connect the power supply ground to J15 (GND). Adjust the LOS threshold with R3 and R4. The output amplitude is approximately 750mVP-P. *Note: U1 has an exposed pad which requires it to be solder attached to the circuit board to insure proper functionality of the part. _________________________________________________________________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: MAX3272A _______________ General Description Evaluates: MAX3272A MAX3272A Evaluation Kit ____________ ___ ___Detailed Description LOS Threshold Adjustment Potentiometers R3 and R4 program the LOS assert threshold. Refer to the MAX3272 / MAX3272A 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 / MAX3272A Data Sheet for details. Setting the Output Polarity Jumper J9 sets the output polarity. Short pins 1 (VCC) and 2 for no signal inversion, and short pins 2 and 3 (GND) for an inversion in output polarity. 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. 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. 2 _________________________________________________________________________________________ MAX3272A Evaluation Kit Evaluates: MAX3272A A Figure 1. MAX3272A EV Kit Schematic _________________________________________________________________________________________ 3 MAX3272A Evaluation Kit 2.70in Evaluates: MAX3272A 1.45in Figure 2. MAX3272A EV Kit Component Placement Guide – Component Side 4 _________________________________________________________________________________________ MAX3272A Evaluation Kit Evaluates: MAX3272A 1.45in 2.70in 2.70in 1.45in Figure 3. MAX3272A EV Kit PC Board Layout – Component Side Figure 4. MAX3272A EV Kit PC Board Layout – Solder Side _________________________________________________________________________________________ 5 MAX3272A Evaluation Kit Figure 5. MAX3272A EV Kit PC Board Layout – Ground Plane 1.45in 2.70in 2.70in Evaluates: MAX3272A 1.45in Figure 6. MAX3272A EV Kit PC Board Layout – Power Plane Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operation parameters, including “typicals” must be validated for each customer application by customer’s technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury or death may occur. 6 _________________________________________________________________________________________