19-2346; Rev 0; 2/02 MAX3861 Evaluation Kit Features ♦ Easy 3.3V Electrical Evaluation of the MAX3861 ♦ Fully Assembled and Tested ♦ EV Kit Designed for 50Ω Interfaces 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 Ordering Information PART MAX3861EVKIT TEMP RANGE IC PACKAGE -40°C to +85°C 24 QFN Note: Please indicate that you are using the MAX3861 when ordering from these suppliers. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C1–C8 8 0.1µF ±10% ceramic capacitors (0402) C9, C12 2 0.22µF ±10% ceramic capacitors (0603) LED1 1 Red LED R1 1 221Ω ±1% resistor (0603) 7 0.1µF ±10% ceramic capacitors (0603) R2, R3 2 49.9kΩ ±1% resistors (0603) R4 1 392Ω ±1% resistor (0603) 1 2200pF ±10% ceramic capacitor (0603) R5 1 500Ω potentiometer R6, R7 2 50kΩ potentiometers C10, C11, C13–C17 C18 L1, L2, L3 3 56nH inductors Coilcraft 1206CS-560XKBC C19 1 2.2µF ±10% ceramic capacitor (1206) TP1–TP7, VCC, GND (JU8) 10 Test points C20 1 33µF ±10% tantalum capacitor (1808) U1 1 MAX3861EGG 24-pin QFN* J1–J8 8 SMA connectors, edge mount None 1 MAX3861 evaluation circuit board, rev C JU1 1 1 ✕ 3-pin header (0.1in centers) None 1 MAX3861 data sheet 0 1 ✕ 2-pin headers (0.1in centers) DO NOT INSTALL JU2–JU7, JU9 *U1 has an exposed pad that requires it to be solder-attached to the circuit board to ensure proper part functionality. ________________________________________________________________ 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: MAX3861 General Description The MAX3861 EV kit is a fully assembled demonstration kit that provides easy evaluation of the MAX3861 2.7Gbps +3.3V automatic gain-control amplifier. The evaluation kit also includes a calibration circuit that allows bandwidth measurements. Evaluates: MAX3861 MAX3861 Evaluation Kit Quick Start 1) Connect a differential signal source with 100mVP-P amplitude with a 223 - 1 PRBS or K28.5 pattern to the differential inputs of the MAX3861 EV kit (J1 and J2). Set the signal source data rate to 2.7Gbps. 2) Connect OUT+ (J3) and OUT- (J4) to the 50Ω inputs of a high-speed oscilloscope 3) Connect a +3.3V power supply to the VCC test point, then connect the power-supply ground to the GND test point. Power-up board. 4) Adjust potentiometer R7 to set the output amplitude. Turn the potentiometer clockwise to increase amplitude. Detailed Description The MAX3861 EV kit simplifies MAX3861 evaluation. In jumper descriptions, “top” and “bottom” refer to the board positioned with the GND and VCC terminals at the top. Threshold Resistor Setting Signal Detection Enable Jumper JU1 sets the EN pin. To enable signal detection circuitry (SD and RSSI), shunt the top two pins of JU1 or leave the jumper open. To disable, shunt the bottom two pins. TH Test Point The TH test point (TP1) can be used to measure the voltage at the TH pin, or to measure the total resistance RTH to ground. Refer to the Signal Detect Threshold vs. RTH graph in the Typical Operating Characteristics section of the MAX3861 data sheet. EN Test Point The EN test point (TP2) is used to test the EN pin voltage. Make sure the pin has +3.3V to enable the signal detection circuitry and 0V to disable it. VREF Test Point Use the VREF test point (TP3) to ensure VREF = 2V. SC Test Point Potentiometers R5 and R6 set the signal detect threshold. The total threshold resistance RTH is the sum of R5, R6, and the 221Ω resistor R1. If R5 and R6 are both at maximum resistance, the threshold will be set at its minimum value. Refer to the Signal Detect Threshold vs. RTH graph in the Typical Operating Characteristics section in the MAX3861 data sheet for correct sizing. Use the SC test point (TP4) to measure the voltage on the SC pin. Refer to the Typical Operating Characteristics section of the MAX3861 data sheet. Swing Control Setting Use the SD test point (TP6) to measure the signal detect output. This pin should indicate low (<0.4V) when the input signal falls below the threshold set at the TH pin, and indicate high (>2.4V) in normal operation. The output amplitude is controlled by potentiometer R7. If maximum output amplitude is desired, decrease R7 to its minimum value to create minimal resistance between VREF and SC. If maximum output amplitude is not desired, increase the resistance until the desired output amplitude is reached. Refer to the Output Signal Amplitude vs. SC Pin Voltage graph in the Typical Operating Characteristics section of the MAX3861 data sheet. 2 OSM Test Point The OSM test point (TP5) can be used to monitor the output signal strength. SD Test Point RSSI Test Point The RSSI test point (TP7) can be used to monitor the input signal strength. _______________________________________________________________________________________ _______________________________________________________________________________________ J6 J5 IN- J2 IN+ J1 GND VCC C6 0.1µF C5 0.1µF C2 0.1µF C1 0.1µF C20 33µF CALM CALP 3 R5 500Ω 3 1 1 2 C19 2.2µF L1 56nF GND 3 R6 50kΩ 3 1 1 2 GND R1 221Ω C13 0.1µF JU6 C14 0.1µF GND C11 0.1µF 1 1 JU9 TP1 TH 2 3 C12 0.22µF EN JU1 JU2 R7 50kΩ 3 C16 0.1µF C17 0.1µF TP4 TP3 TP2 SC VREF EN VCC IN- IN+ VCC TH C9 0.22µF VCC_OUT VCC_INT JU7 CZ+ VREF L2 56nF GND C10 0.1µF U1 EXPOSED PADDLE MAX3861EGG CZSC VCC_AUX GND GND C15 0.1µF CD+ CG+ L3 56nF OSM VCC OUT- OUT+ VCC SD RSSI C18 2200pF CDCG- TEST POINTS RSSI GND EP RSSI R2 49.9kΩ BP TP7 JU4 JU3 OSM TP5 SD TP6 R3 49.9kΩ J4 OUT- J3 OUT+ C8 0.1µF C7 0.1µF J8 J7 BACK PLANE CONTACT TO EXPOSED PADDLE C4 0.1µF C3 0.1µF JU5 R4 392Ω LED1 Evaluates: MAX3861 *JUMPER SHORTED ON BOTTOM PLANE MAX3861 Evaluation Kit Figure 1. MAX3861 EV Kit Schematic 3 Evaluates: MAX3861 MAX3861 Evaluation Kit 1.0" Figure 2. MAX3861 EV Kit Component Placement Guide— Component Side 4 1.0" Figure 3. MAX3861 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ MAX3861 Evaluation Kit Evaluates: MAX3861 1.0" 1.0" Figure 4. MAX3861 EV Kit PC Board Layout—Solder Side Figure 5. MAX3861 EV Kit PC Board Layout—Ground Plane _______________________________________________________________________________________ 5 Evaluates: MAX3861 MAX3861 Evaluation Kit 1.0" Figure 6. MAX3861 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.