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| 19-1460; Rev 0; 4/99 MAX3750 Evaluation Kit General Description 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 50 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. o Interfaces with 50 Systems o Fully Assembled and Tested o Calibration Circuit for Accurate Jitter Measurement Features Evaluates: MAX3750/MAX3751 Ordering Information PART MAX3750EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP Component List DESIGNATION QTY C1-C10, C13-16 C11 C12 J1 J2-J13 L1 None R1, R2, R4, R5, R7, R8, R10, R11, R13, R14, R16, R18 R3, R6, R9, R12, R15, R17 VCC, GND U1 None None 14 1 1 1 12 1 1 12 DESCRIPTION 0.1F, 25V min, 10% ceramic capacitors 2.2F, 25V min, 10% ceramic capacitor 33F 10%, 16V min tantalum capacitor 3-pin header (0.1" center) SMA connectors (edge mount) 56nH inductor Shunt for J1 Note: To evaluate the MAX3751, order the MAX3750EVKIT and a sample of the MAX3751. Component Supplier SUPPLIER AVX PHONE 803-946-0690 FAX 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: 43.2, 1% resistors 6 1 1 1 1 178, 1% resistors 2-pin headers MAX3750CEE or MAX3751CEE (16 QSOP) MAX3750/MAX3751 circuit board 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 50 matched impedance cables to a 50 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. MAX3750 Evaluation Kit Evaluates: MAX3750/MAX3751 Input and Output Impedance Conversion For convenient interface with standard test equipment, the MAX3750 EV kit is equipped with impedance transforming resistive networks on its inputs (50 to 75) and outputs (75 to 50). 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. Table 1. Connections, Adjustments, and Controls CONTROL SHUNT BETWEEN PINS 1-2 J1 2-3 Connects LIN to OUT SELECT Connects IN to OUT J2 LOUT+ 50 C1 0.1F R1 43.2 75 75 1 2 16 15 14 13 12 11 10 9 75 J1 SEL 123 C9 0.1F C10 0.1F L1 56nH 75 75 R7 43.2 C5 0.1F 50 J6 IN+ J3 LOUT- 50 C2 0.1F R3 178 75 R2 43.2 GND LOUT+ LOUTGND GND OUT+ OUTGND GND IN+ R9 178 3 4 5 U1 MAX3750 MAX3751 C6 0.1F 50 J7 IN- INVCC VCC LIN+ LINSEL R8 43.2 R10 43.2 C7 0.1F 50 J8 LIN+ R12 178 J4 OUT+ 50 C3 0.1F R4 43.2 75 6 7 J5 OUT- 50 C4 0.1F R6 178 75 R5 43.2 8 C8 0.1F 50 J9 LIN- R11 43.2 VCC C11 2.2F R16 43.2 R17 178 C15 0.1F C12 33F GND J12 TEST+ J10 TEST2+ 50 C13 0.1F R13 43.2 R15 178 75 50 J11 TEST2- 50 C14 0.1F 75 R14 43.2 R18 43.2 C16 0.1F 50 J13 TEST- Figure 1. MAX3750 EV Kit Schematic 2 _______________________________________________________________________________________ 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 MAX3750 Evaluation Kit Evaluates: MAX3750/MAX3751 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 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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