Evaluates: MAX3945 19-5239 Rev 0 4/10 MAX3945 Evaluation Kit General Description Features The MAX3945 evaluation kit (EV kit) is an assembled S Fully Assembled and Tested electrical demonstration board that provides easy S Software Control Through USB Port computer-controlled evaluation of the MAX3945 mul- S SMA Connectors for High-Speed Inputs and tirate limiting amplifier. The included software commu- Output nicates with the EV kit through the USB port, and pro- vides access to all the internal registers to optimize the functionality of the MAX3945. The EV kit is powered by a Ordering Information +3.3V supply and USB port. SMA connectors are used for the high-speed inputs and outputs. An LED indicates PART TYPE the status of USB power. MAX3945EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. EV Kit Contents S MAX3945 EV Kit Board Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 4.7FH inductor C1C4, C10, L1 1 Taiyo Yuden CBC3225T4R7MR C12, C20, C25, 12 0.1FF ceramic capacitors (0402) C26, C27, C49 1FH inductors (0603) L2, L3 2 C52 Taiyo Yuden FB MH1608HM102-T C5, C6, C8, 22FH, 520mA inductor 6 1000pF ceramic capacitors (0402) L13 1 C9, C11, C19 Taiyo Yuden CBC3225T220M C7 1 100pF ceramic capacitor (0402) R1 1 1kI resistor (0402) C13 1 0.1FF ceramic capacitor (0603) R7, R50 2 4.7kI resistors (0402) C14 1 0.1FF ceramic capacitor (0805) R24 1 1.5kI resistor (0402) C15 1 22FF tantalum capacitor (B case) R25, R29, R52, 5 499I resistors (0402) R62, R66 C18, C22 2 33pF ceramic capacitors (0402) C34, C55 2 1FF ceramic capacitors (0603) R30, R31, R51, 4 10kI resistors (0402) R53 C35, C37, C38 3 4.7FF ceramic capacitors (0805) D6 1 Green LED R91 1 680I resistor (0402) 1 x 2, 0.1in pitch header Limiting amplifier (16 TQFN-EP*) J1 1 U1 1 Digi-Key S1012-36-ND Maxim MAX3945ETE+ 8-bit CMOS microcontroller with USB SMA PCB-mount RF connectors J2, J4, J5, J9 4 U10 1 Microchip PIC16C745-I/SO Johnson 142-0701-851 USB connector 6MHz crystal J3 1 Y1 1 Tyco 1734035-1 ECS Inc. ECS-60-32-5 PXDN PCB: MAX3945 EVALUATION J6, J10, 1 BOARD TP1, TP2, TP3, Test points 11 TP7, TP8, Digi-Key 5000K-ND *EP = Exposed pad. TP10TP13 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX3945 Evaluation Kit Figures 1a and 1b show the electrical schematics of the Quick Start MAX3945 EV kit, while Figures 2 to 6 show the various Note: In the following sections, software-related items layers of the PCB. are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and General Setup M underlined refers to items from the Windows operating 1) Set up the EV kit according to the Quick Start system. instructions. Then connect a USB cable from the EV 1) Reviewing the MAX3945 without the program is kit to a computer. simple. Connect jumper J1, as shown in Figure 2. At 2) Load the program onto the computer and click on the this time, do not connect the USB cable from the EV .ZIP file. Then click on Setup. Follow the instructions that kit to the computer. Without the program control, the come with the program. Users must have a Windows MAX3945 operates in the default mode. The default operating system. mode is shown in Table 1. 3) When the GUI appears on the screen, click on the 2) From a 3.3V power supply, connect a wire from the USB Connect and Rx Read All button. The default 0V terminal to GND on the EV kit (J10). Then con- settings appear on the screen. Note that the soft nect a wire from the 3.3V terminal to the VCC pin reset resets the part when the Rx Read All button is (J6). Connect two cables with SMA connectors from clicked, but the GUI is not updated until the Rx Read a digital signal source to the RIN+ (J4) and RIN- (J9) All button is toggled a second time. of the EV kit. Connect two more cables from ROUT+ 4) It is a simple matter to change the settings in the (J2) and ROUT- (J5) to an oscilloscope. GUI. Figures 7, 8, and 9 show the GUI dialog boxes 3) On the signal source choose an NRZ signal between with the resulting waveforms. The input waveform is 10mV to 1.2V at a data rate from 1Gbps to P-P P-P a 200mV PRBS31 signal at 6.25Gbps. Note the P-P 11Gbps. Observe the output signal on the scope. changes to the output waveforms as the settings are changed. Table 1. Default Mode FUNCTION CONTROL Receive circuitry enabled RX EN = 1 High bandwidth signal path RATE SEL = 1 Differential output signal level SET CML 7:0 = 92d (400mV ) P-P No deemphasis RXDE EN = 0 Signal-loss detect enabled LOS1 EN = 1 LOS assert threshold of SET LOS 5:0 = 12d approximately 15mV P-P LOS timer period SET LOSTIMER 6:0 = 0 Noninverted signal polarity RX POL = 1 Squelch disabled SQ EN = 0 Autozero loop enabled AZ EN = 1 Windows is a registered trademark of Microsoft Corp. 2 Evaluates: MAX3945