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| 19-2681; Rev 0; 10/02 MAX3785 Evaluation Kit General Description The MAX3785 evaluation kit (EV kit) simplifies evaluation of the MAX3785 6.25Gbps equalizer. The EV kit enables testing of all device functions. SMA connectors with 50 controlled impedance to the MAX3785 are provided for all input and output ports to facilitate connection to high-speed test equipment. Features o SMA Connectors for All High-Speed Inputs and Outputs o Fully Assembled and Tested o Calibration Test Strip Evaluates: MAX3785 Component Suppliers SUPPLIER AVX Coilcraft Murata PHONE 843-444-2863 847-639-6400 415-964-6321 FAX 843-626-3123 847-639-1469 415-964-8165 PART MAX3785EVKIT Ordering Information TEMP RANGE 0C to +85C PIN-PACKAGE 6 UCSP Note: Please indicate that you are using the MAX3785 when contacting these component suppliers. Component List DESIGNATION C1 QTY 1 DESCRIPTION 33F 10% tantalum capacitor, case B AVX TAJB336M010R 0.1F 10%, 10V ceramic capacitors (0402) Test points Digi-Key 5000K-ND SMA connectors, edge mount, tab contacts EFJohnson 142-0701-851 4.7H inductor Coilcraft 1008CT-040XJBC MAX3785UBL MAX3785 evaluation circuit board, rev A MAX3785 data sheet Quick Start 1) Connect a +1.8V power supply to J1 (V CC ). Connect the power supply ground to J2. 2) Connect DC-blocking capacitors or bias T networks to IN+ and IN- inputs. Then connect a differential signal from 400mVP-P to 1600mVP-P to the inputs using 50 cables. If not using DC-blocking capacitors, then the high level for each input signal must be VCC. Warning: The SMA connectors are directly connected to the chip's inputs and outputs. To avoid damage to laboratory equipment or device, always use DC-blocking capacitors or bias T networks. 3) Connect DC-blocking capacitors or bias T networks to OUT+ and OUT- outputs. Then connect signals from the DC-blocking capacitors to an oscilloscope with 50 input terminations. 4) At the signal source, start with a short, simple pattern such as a 27 - 1 PRBS. The data rate can be 1Gbps to 6.4Gbps. 5) Evaluation: After the EV kit has been initially checked out, evaluation can begin with a FR4 PC board. Start with a board length of 20in and progress to longer lengths. For data rates of 3.2Gbps and slower, the part equalizes board lengths up to 40in. For data rates of 6.4Gbps and slower, the part equalizes board lengths up to 30in. When connecting the equalizer with the board, keep the cables from the board to the equalizer as short as possible. 1 C2, C3 J1, J2 2 2 J3-J8 6 L1 U1 None None 1 1 1 1 ________________________________________________________________ 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. MAX3785 Evaluation Kit Evaluates: MAX3785 J1 VCC L1 4.7H C1 33H J2 GND C2 0.1H C3 0.1H A2 J4 INA1 INGND OUTA3 J5 OUT- J3 IN+ MAX3785 C1 IN+ VCC C2 OUT+ C3 J6 OUT+ J7 CALIN J8 CALOUT Figure 1. MAX3785 EV Kit Schematic 2 _______________________________________________________________________________________ MAX3785 Evaluation Kit Evaluates: MAX3785 1.0" Figure 2. MAX3785 EV Kit Component Placement Guide _______________________________________________________________________________________ 3 MAX3785 Evaluation Kit Evaluates: MAX3785 1.0" Figure 3. MAX3785 EV Kit PC Board Layout--Component Side 4 _______________________________________________________________________________________ MAX3785 Evaluation Kit Evaluates: MAX3785 1.0" Figure 4. MAX3785 EV Kit PC Board Layout--Ground Plane _______________________________________________________________________________________ 5 MAX3785 Evaluation Kit Evaluates: MAX3785 1.0" Figure 5. MAX3785 EV Kit PC Board Layout--Power Plane 6 _______________________________________________________________________________________ MAX3785 Evaluation Kit Evaluates: MAX3785 1.0" Figure 6. MAX3785 EV Kit PC Board Layout--Bottom Side 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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