19-1451; Rev 0; 3/99 MAX3866 Evaluation Kit The MAX3866 evaluation kit (EV kit) is a fully assembled, chip-on-board (COB) electrical demonstration kit. It provides easy evaluation of the MAX3866 2.5Gbps, +3.3V combined transimpedance/limiting amplifier. Features ♦ Easy +3.3V or +5.0V Electrical Evaluation of MAX3866 ♦ Evaluation of Adjustable Loss-of-Power (LOP) ♦ Fully Assembled and Tested Component List DESIGNATION QTY DESCRIPTION C1, C2, C3, C5–C8 7 100nF, 25V min, 10% ceramic capacitors (0603) C9, J2, J3, L2, R4, R10, R11, R12, TP2, TP3 0 Leave site open L1 1 1µH inductor Coilcraft 1008CS-102 XKBB, 10% R1 1 500Ω potentiometer R2 1 150Ω, 1% resistor (0402) R3, R7 2 1kΩ, 1% resistors (0402) R5, R8 2 49.9Ω, 1% resistors (0402) R6 1 ♦ EV Kit Designed for 50Ω I/O Interface Ordering Information PART TEMP. RANGE MAX3866EVKIT -40°C to +85°C Component Suppliers PHONE FAX AVX 803-946-0690 803-626-3123 Central Semiconductor 516-435-1110 516-435-1824 1kΩ potentiometer Murata 814-237-1431 814-238-0490 Zetex 516-543-7100 516-864-7630 R9 1 1MΩ potentiometer CR1 1 LED INPUT (J1), OUT+ (J4), OUT- (J5) 3 SMA connectors (edge mount) E.F. Johnson 142-0701-801 or Digi-Key J502-ND LOP 1 Test point Mouser 151-203 VCCS, VCCD, GND 3 2-pin headers (0.1" centers) Digi-Key S1012-36-ND VCCS 1 Shunt (installed) Digi-Key S9000-ND U1 1 MAX3866E/D None 2 MAX3866 circuit boards, Rev. B None 1 MAX3866 data sheet None 1 MAX3866 EV kit data sheet None 3 0.5" spacers None 6 Screws for the spacers SUPPLIER Note: Please indicate that you are using the MAX3866 when ordering from these suppliers. Electrical Quick Start 1) Attach matched 50Ω SMA cables from a 50Ω oscilloscope to OUT+ and OUT-. Set the oscilloscope to 20mV/div and 200ps/div. A single-ended evaluation is acceptable; however, the cable not terminated into the scope should be terminated with a 50Ω load at the end of the cable. 2) Ensure that there is a shunt across the VCCS pins. (Remove shunt for 5.0V operation.) 3) Attach ground to either side of the GND 2-pin header and +3.3V (or +5.0V) to either side of the VCCD 2-pin header. 4) Connect a 50Ω cable between the output of a 50Ω source and the input of the EV kit. Set the source to produce a 2.0Vp-p, 2.5Gbps 1-0 pattern. 5) Adjust R9 and R6 to produce a DC current of 1mA (1mA = 2.0Vp-p / 1kΩ / 2) through R7. This can be verified by checking for a 1V drop across R7. 6) Verify that the input pattern is present at the output. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Evaluates: MAX3866 General Description MAX3866 Evaluation Kit Evaluates: MAX3866 Adjustment and Control Description 2 CONTROL NAME FUNCTION/MANIPULATION VCCD VCCD Power-Supply Voltage. Both pins of this dual-pin header are the same point. VCCS VCCS Power-Supply Select Jumper. Do not apply any external voltages at this point. Both pins of this 2-pin header are not connected electrically. Depending on what the operating voltage is, either place a shunt at VCCS or remove the shunt from VCCS. When evaluating at 3.14V to 3.47V, ensure that there is a shunt on VCCS. If the evaluation voltage is 5.0V to 5.5V, remove this shunt and place a 100nF capacitor in location C8. (EV kit is shipped with 100nF in the C8 location; see Figure 1.) J1 INPUT Single-Ended Input, 3mVp-p to 2.5Vp-p range. This translates into a current of 3µA to 2.5mA, respectively (voltage at input) / (R3 = 1kΩ). Note that the EV kit input is terminated for a 50Ω source. J4, J5 OUTP, OUTM Signal Outputs (AC-coupled). Note that the EV kit outputs are designed for 50Ω termination. R1 — Sets the LOP Threshold. For normal operation, Maxim recommends R8 + R1 = 510Ω. However, if other values are desired, please refer to the Typical Operating Characteristics section (Assert/Deassert vs. RPD) of the MAX3866 data sheet. R6, R9 — Micro and Macro Current Adjustment. Simulates the average DC current portion of a diode. The amount of current that should be set through these potentiometers is calculated by the formula (AC current into MAX3866) / 2 = DC bias current. CR1 DIODE LOP is active high. Therefore, when an LOP condition exists, the LED will be off. SJ2 — Solder Jumper. For normal operation, ensure that this solder jumper is open. TP1 LOP TTL Output, active high. Probe this test point only with a high-impedance lead. _______________________________________________________________________________________ 2 INPUT J1 SMA F 1 C3 100nF R7 1k L1 1µH R3 1k SJ2 SOLDER JUMPER OPEN R10 OPEN R5 50Ω LINE TERMINATION 2 C9 OPEN 1 R6 1k L2 OPEN R11 OPEN 2 R12 OPEN 3 1 R9 1M 2 2 GND GND 3 ZTEST2 J3 SMA 1 F INV 3 GND GND MAX3866 U1 CPD- CPD+ GND OUT- OUT+ GND LOP VCCD VCCD C8 100nF 2 CHF+ VCCS VCCS 1 R1 500Ω PDC N.C. GND IN- IN+ GND R8 50Ω 2 CHFFIL- C1 100nF C7 100nF 1 VCCS C2 100nF GND GND LOP (C8 IS NOT REQUIRED IN 3.3V OPERATION.) R4 OPEN R2 150Ω VCCD 2 1 2 1 C6 100nF C5 100nF CR1 DIODE GND P2 1 2 OUT+ J4 SMA VCCD 1 2 OUTJ5 SMA VCCD P1 (3.13V... 3.47V OR 4.5V....5.5V) Evaluates: MAX3866 ZTEST1 J2 SMA F ZO = 50 1 MAX3866 Evaluation Kit Figure 1. MAX3866 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3866 MAX3866 Evaluation Kit 1.0" Figure 2. MAX3866 EV Kit Component Placement Guide— Component Side 4 _______________________________________________________________________________________ MAX3866 Evaluation Kit Evaluates: MAX3866 1.0" 1.0" Figure 3. MAX3866 EV Kit PC Board Layout—Component Side Figure 4. MAX3866 EV Kit—Ground Plane _______________________________________________________________________________________ 5 Evaluates: MAX3866 MAX3866 Evaluation Kit 1.0" Figure 5. MAX3866 EV Kit—Power Plane 6 1.0" Figure 6. MAX3866 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ MAX3866 Evaluation Kit Evaluates: MAX3866 HF23Z 1.0" Figure 7. MAX3866 EV Kit—Bond Diagram _______________________________________________________________________________________ 7 Evaluates: MAX3866 MAX3866 Evaluation Kit NOTES 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.