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19-2364; Rev 0; 3/02
MAX3272 Evaluation Kit
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. o Single +3.3V Power Supply o Fully Assembled and Tested o Includes Calibration Strip for Accurate Measurements o EV Kit Designed for 50 Interfaces o Easy LOS Threshold Programming o Easy Output Polarity Control
Features
Evaluates: MAX3272
Component List
DESIGNATION C1 C2 C3, C16 C4-C7 C8-C15, C17 R1, R2 R3 R4 L1 U1 J1-J8 J9, J10, J11 J12, J13 J14, J15, TP1, TP2 None None QTY 1 1 2 4 9 2 1 1 1 1 8 3 2 4 1 1 DESCRIPTION 33F 10% tantalum capacitor 2.2F 10% tantalum capacitor 0.1F 10% ceramic capacitors (0402) 1000pF 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0402) 4.75k 1% resistors (0402) 20k potentiometer 2k potentiometer 56nH inductor Coilcraft 0805CS-560XKBC MAX3272EGP 20-QFN* SMA connectors, edge mount (round contact) 1 x 3-pin headers (0.1in centers) 1 x 2-pin headers (0.1in centers) Test points MAX3272 evaluation circuit board, rev A MAX3272 data sheet SUPPLIER AVX Coilcraft Murata Venkel PART MAX3272EVKIT
Ordering Information
TEMP RANGE -40C to +85C IC PACKAGE 20 QFN
Component Suppliers
PHONE 843-448-9411 847-639-6400 814-237-1431 800-950-8365 FAX 843-448-1943 847-639-1469 814-238-0490 512-794-0087
Note: Please indicate that you are using the MAX3272 when ordering from these suppliers.
Quick Start
1) Connect a shunt across pins 1 (VCC) and 2 of jumper J9 for no inversion in the output polarity. 2) Ensure that J13 is open. 3) Connect OUT+ and OUT- to a 50 terminated oscilloscope. 4) Apply a differential input (15mVP-P to 1200mVP-P) between IN+ and IN-. 5) Connect a +3.3V power supply to J14 (VCC), then connect the power-supply ground to J15 (GND). 6) Adjust the LOS threshold with R3 and R4. 7) The output amplitude is approximately 750mV.
*Note: U1 has an exposed pad that requires that it be solder attached to the circuit board to ensure proper functionality of the part.
________________________________________________________________ Maxim Integrated Products
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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.
MAX3272 Evaluation Kit Evaluates: MAX3272
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 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 0.01F capacitor, short the jumper. For a shorter time constant (about 2s), leave the jumper open.
Setting the Offset Correction Capacitor
Jumper J10 sets the offset correction loop capacitor. Short pins 1 and 2 to set CAZ = 0.1F; 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.
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. 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 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.
LOS Test Point
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.
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MAX3272 Evaluation Kit Evaluates: MAX3272
VCC L1 56nH C1 33F C2 2.2F C3 0.1F VCC VCC C4 1000pF CAZ J10 C16 0.1F OUTPOL J9
VCC
J14 J15
GND
VCC VCC IN+ J5 C8 0.01F GND IN+ INC9 0.01F GND TH VCC VCC R3 20k C5 1000pF R4 2k J12 C17 0.01F R1 4.75k VCC CLOS SQUELCH LOS U1 CAZ1 CAZ2 GND OUTPOL VCC OUT+ OUTVCC LEVEL LOS J13 LEVEL TP1 TP2 CLOS R2 VCC 4.75k C6 1000pF C7 1000pF C11 0.01F OUT+ J7
INJ6
MAX3272
VCC
OUTC10 0.01F J8
J11 J1 C12 0.01F
SQUELCH C14 0.01F
J3
J2
C13 0.01F
C15 0.01F
J4
Figure 1. MAX3272 EV Kit Schematic
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MAX3272 Evaluation Kit Evaluates: MAX3272
1.45in, 36.8mm
Figure 2. MAX3272 EV Kit Component Placement Guide--Component Side
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2.7in, 68.6mm
MAX3272 Evaluation Kit Evaluates: MAX3272
1.45in, 36.8mm
1.45in, 36.8mm
2.7in, 68.6mm
Figure 3. MAX3272 EV Kit PC Board Layout--Component Side
Figure 4. MAX3272 EV Kit PC Board Layout--Solder Side
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2.7in, 68.6mm
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MAX3272 Evaluation Kit Evaluates: MAX3272
1.45in, 36.8mm 1.45in, 36.8mm
2.7in, 68.6mm
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
2.7in, 68.6mm

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