19-1460; Rev 0; 4/99 MAX3750 Evaluation Kit The MAX3750 evaluation kit (EV kit) simplifies evaluation of the MAX3750/MAX3751 port bypass ICs. It provides impedance transformation networks that allow interface with standard 50Ω test equipment. This fully assembled and tested EV kit includes a jumper to facilitate signal flow selection, and a calibration circuit that allows accurate jitter measurement. Features ♦ Interfaces with 50Ω Systems ♦ Fully Assembled and Tested ♦ Calibration Circuit for Accurate Jitter Measurement Ordering Information PART MAX3750EVKIT Component List DESIGNATION QTY 0°C to +70°C IC PACKAGE 16 QSOP Note: To evaluate the MAX3751, order the MAX3750EVKIT and a sample of the MAX3751. DESCRIPTION C1–C10, C13–16 14 0.1µF, 25V min, 10% ceramic capacitors C11 1 2.2µF, 25V min, 10% ceramic capacitor C12 TEMP. RANGE 1 33µF ±10%, 16V min tantalum capacitor J1 1 3-pin header (0.1" center) J2–J13 12 SMA connectors (edge mount) L1 1 56nH inductor None 1 Shunt for J1 Component Supplier SUPPLIER AVX PHONE FAX 803-946-0690 803-626-3123 Note: Please indicate that you are using the MAX3750 or MAX3751 when contacting this component supplier. Quick Start To evaluate the MAX3750 or MAX3751 input-to-output signal path: R1, R2, R4, R5, R7, R8, R10, R11, R13, R14, R16, R18 12 43.2Ω, 1% resistors R3, R6, R9, R12, R15, R17 6 178Ω, 1% resistors VCC, GND 1 2-pin headers U1 1 MAX3750CEE or MAX3751CEE (16 QSOP) None 1 MAX3750/MAX3751 circuit board None 1 MAX3750/MAX3751 data sheet 1) Connect a differential signal source to the input at IN+, IN-. Set the signal amplitude to 500mVp-p. The input signal can have a data rate up to 1Gbps for the MAX3751 and 2.1Gbps for the MAX3750. 2) Connect OUT+ and OUT- through 50Ω matched impedance cables to a 50Ω oscilloscope. 3) Connect a +3.3V supply to the VCC terminal, and a ground to the GND terminal. 4) Shunt pins 1 and 2 on J1 to select the IN to OUT signal path. 5) Ensure that the differential signal at the oscilloscope is between 425mV and 690mV. ________________________________________________________________ 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: MAX3750/MAX3751 General Description Evaluates: MAX3750/MAX3751 MAX3750 Evaluation Kit Input and Output Impedance Conversion Table 1. Connections, Adjustments, and Controls For convenient interface with standard test equipment, the MAX3750 EV kit is equipped with impedance transforming resistive networks on its inputs (50Ω to 75Ω) and outputs (75Ω to 50Ω). The impedance transforming networks also introduce signal attenuation. The input signal is attenuated by a factor of 0.64, and the output signal is attenuated by a factor of 0.43. For example, a differential signal of 600mV applied to the input terminals of the MAX3750 EV kit will produce a differential input signal of 381mV across the IC’s input pins. If a differential signal of 225mV is observed at the output terminals of the EV kit, then the actual output of the IC is a differential signal of 600mV. J2 50Ω C1 0.1µF R1 43.2Ω SHUNT BETWEEN PINS CONTROL SELECT 1–2 Connects IN to OUT 2–3 Connects LIN to OUT J1 75Ω 75Ω R7 43.2Ω C5 0.1µF 50Ω J6 IN+ LOUT+ J3 50Ω C2 0.1µF 1 R3 178Ω 2 75Ω LOUT- J4 50Ω C3 0.1µF 3 R2 43.2Ω 4 R4 43.2Ω 5 75Ω OUT+ 6 7 J5 50Ω C4 0.1µF R6 178Ω 8 GND GND IN+ LOUT+ LOUTGND GND U1 MAX3750 MAX3751 LIN- GND SEL R9 178Ω 15 75Ω 14 R13 43.2Ω 50Ω J7 IN- 12 75Ω 11 R10 43.2Ω C7 0.1µF 50Ω J8 LIN+ 10 R12 178Ω 9 75Ω 1 2 3 C8 0.1µF 50Ω J9 LIN- J1 SEL 75Ω C6 0.1µF R8 43.2Ω 13 75Ω C9 0.1µF 50Ω VCC OUT- R5 43.2Ω J10 VCC LIN+ OUT+ OUT- C13 0.1µF IN- 16 L1 56nH R11 43.2Ω VCC C10 0.1µF C11 2.2µF R16 43.2Ω C12 33µF C15 0.1µF 50Ω GND J12 TEST+ TEST2+ J11 50Ω C14 0.1µF R15 178Ω R17 178Ω 75Ω C16 0.1µF R14 43.2Ω R18 43.2Ω Figure 1. MAX3750 EV Kit Schematic 2 50Ω J13 TEST- TEST2- _______________________________________________________________________________________ MAX3750 Evaluation Kit Evaluates: MAX3750/MAX3751 1.0" 1.0" Figure 2. MAX3750 EV Kit Component Placement Guide— Component Side Figure 3. MAX3750 EV Kit Component Placement Guide— Solder Side _______________________________________________________________________________________ 3 Evaluates: MAX3750/MAX3751 MAX3750 Evaluation Kit 1.0" 1.0" Figure 4. MAX3750 EV Kit PC Board Layout—Ground Plane Figure 5. MAX3750 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. 4 _____________________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.