19-4291; Rev 0; 10/08 MAX4951 Evaluation Kit The MAX4951 evaluation kit (EV kit) provides a proven design to evaluate the MAX4951 dual-channel buffer. The EV kit contains four sections: an application circuit, a characterization circuit, and two calibration traces. The application circuit is designed to demonstrate the use of the MAX4951 in redriving serial-ATA (SATA) and eSATA Gen I and Gen II signals. This section of the EV kit operates from an external +5V supply that is regulated by an on-board LDO to +3.3V, which powers the MAX4951 (U1) device. All traces in the application circuit are 100Ω differential controlled impedance. The characterization circuit is provided for eye diagram evaluation using SMA connectors and 50Ω controlled impedance traces. This section is powered by an external +3.3V supply. Features o Application Circuit with SATA Input/Output o Eye Diagram Test Circuit with SMA Inputs/Outputs o Calibration Traces (50Ω Load Trace and Through Trace) o Lead-Free and RoHS Compliant o Proven PCB Layout o Fully Assembled and Tested Ordering Information PART TYPE MAX4951EVKIT+ EV Kit +Denotes lead-free and RoHS compliant. Component List DESIGNATION C1–C8, C14–C17, C22–C25 C9, C18, C26, C27 C10–C13, C19, C20, C21 QTY 16 4 7 DESCRIPTION DESIGNATION QTY JU4 1 JU6 0 Not installed, 3-pin header P1–P10 10 Edge-mount receptacle SMA connectors Johnson 142-0701-851 R1 1 200Ω ±5% resistor (0603) R2, R3 2 49.9Ω ±1% resistors (0603) U1, U2 2 SATA I/II bidirectional redrivers (20 TQFN-EP*) MAX4951CTP+ U3 1 +3.3V regulator (6 SOT23) MAX6329TPUT-T+ (Top Mark: AAIP) 0.01µF ±10%, 25V X7R ceramic capacitors (0402) Murata GRM155R71E103KA TDK C1005X7R1E103K 1µF ±10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C105K TDK C1608X7R1C105K 0.1µF ±10%, 16V X7R ceramic capacitors (0402) Murata GRM155R71C104K TDK C1005X7R1C104K DESCRIPTION 2-pin header, 0.1in centers D1 1 Green LED (0603) H1 1 Disk drive power connector — 6 Shunts J1, J2 2 7-position SATA vertical connectors — 1 PCB: MAX4951 Evaluation Kit+ JU1, JU2, JU3, JU5, JU7 5 3-pin headers, 0.1in centers *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX4951 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX4951 General Description Evaluates: MAX4951 MAX4951 Evaluation Kit Quick Start (Application Circuit) Recommended Equipment Before beginning, the following equipment is needed: • MAX4951 EV kit • +5V power supply • • • Two SATA-to-SATA or eSATA-to-SATA cables SATA device (e.g., a hard drive) SATA host (e.g., a PC) Procedure The MAX4951 EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Verify that all jumpers are in their default position, as shown in Table 1. 2) Connect the first SATA-to-SATA/eSATA-to-SATA cable from the PC to the host (J1) connector on the EV kit. 3) Connect the second SATA-to-SATA/eSATA-toSATA cable from the device (J2) connector to the SATA device. 4) Verify communication between the host PC and SATA device. Table 1. Default Shunt Positions JUMPER SHUNT POSITION JU1, JU4, JU5 1-2 JU2, JU3, JU7 2-3 Detailed Description of Hardware The MAX4951 evaluation kit (EV kit) evaluates the MAX4951 dual-channel buffer. The MAX4951 is designed to redrive serial-ATA (SATA) and eSATA Gen I and Gen II signals. The EV kit is divided into four sections: application circuit, characterization circuit, and two calibration traces. The application circuit utilizes 100Ω differential controlled impedance traces and provides two SATA connectors (J1 and J2), allowing for evaluation of the MAX4951 in a SATA environment. The characterization circuit utilizes 50Ω controlled impedance traces and SMA input/output connectors, allowing for eye diagrams and input/output return loss measurements. The lower half of the EV kit provides two sets of calibration traces, all of which are matched to the trace lengths in the characterization circuit. These traces provide a reference for determining the performance of the MAX4951 device only, when evaluated in the characterization circuit. 2 Application Circuit (U1) The application circuit (U1) provides the means for evaluating the MAX4951 in a SATA application. This section of the EV kit provides two SATA connectors (J1 and J2), one for connection to a SATA host (e.g., PC) and the other for connection to a SATA device (e.g., hard drive). Input Supply (VIN) The application circuit must be powered by +3.3V. There are two ways to get this voltage, through the onboard LDO (U3) or connecting directly to a +3.3V supply. When using the on-board voltage regulator, the LDO can be powered by the 4-pin Molex connector (H1) or by a +5V external supply connected to the VIN and GND pads. When using the on-board LDO to supply power, there is a power LED (D1) to indicate the presence of +3.3V at VCC. The user can also connect directly to a +3.3V supply, which is available on a SATA power connector. The shunt should be removed from jumper JU4 and a wire connected from the SATA power pin to pin 2 (rightmost pin) of jumper JU4 (see Table 2). Table 2. Jumper JU4 Function SHUNT POSITION VCC PIN (U1) Installed* Connected to on-board LDO output U1 powered by LDO output, +3.3V Not installed Connected to external supply Powered by +3.3V from an external supply or SATA power connector DESCRIPTION *Default position. Device Enable (JU1) The MAX4951 (U1) is enabled/disabled by configuring jumper JU1 (see Table 3). When disabled, the MAX4951 buffers are disabled and the part is placed in a low-power standby mode. Table 3. Jumper JU1 Function SHUNT POSITION EN PIN (U1) 1-2* Connected to +3.3V Buffers enabled for normal operation 2-3 Connected to GND Buffers disabled and device is in low-power standby mode DESCRIPTION *Default position. _______________________________________________________________________________________ MAX4951 Evaluation Kit Table 4. Jumper JU2 Function SHUNT POSITION BB PIN (U1) 1-2 Connected to +3.3V 2-3* Connected to GND Not installed Not connected DESCRIPTION Device Enable (JU5) The MAX4951 (U2) is enabled/disabled by configuring jumper JU5 (see Table 6). When disabled, the MAX4951 buffers are disabled and the part is placed in a low-power standby mode. Table 6. Jumper JU5 Function SHUNT POSITION EN PIN (U2) 1-2* Connected to +3.3V Buffers enabled for normal operation 2-3 Connected to GND Buffers disabled and device is in low-power standby mode Host output boost enabled Host output boost disabled; standard SATA output levels *Default position. Table 5. Jumper JU3 Function SHUNT POSITION BA PIN (U1) DESCRIPTION 1-2 Connected to +3.3V Device output boost enabled 2-3* Connected to GND Not Installed Not connected Device output boost disabled; standard SATA output levels *Default position. Characterization Circuit (U2) The characterization circuit (U2) is provided as a separate test circuit for eye diagram evaluation of the MAX4951 IC. This circuit provides differential SMA inputs and outputs with 50Ω controlled impedance traces. Channel B is not utilized in this section of the EV kit, but provides the same performance as channel A. Input Supply (VCC) The characterization circuit is powered by an external +3.3V power supply connected between the VCC and GND pads. DESCRIPTION *Default position. Output Boost Control (JU7) The MAX4951 channel A can be evaluated with standard SATA output levels or with boosted output levels. Configure JU7 to enable/disable channel A’s output boost (see Table 7). Table 7. Jumper JU7 Function SHUNT POSITION BA PIN (U2) DESCRIPTION 1-2 Connected to +3.3V Channel A output boost enabled 2-3* Connected to GND Not installed Not connected Channel A output boost disabled; standard SATA output levels *Default position. Calibration Traces The lower half of the EV kit provides two sets of calibration traces that can be used for further analysis. The lengths of the calibration traces are matched to the traces going from the SMA connector to MAX4951 (U2) of the characterization circuit. The first calibration trace includes a 50Ω load termination and the second calibration trace is a through trace. _______________________________________________________________________________________ 3 Evaluates: MAX4951 Output Boost Control (JU2, JU3) The MAX4951 host and device can be evaluated with standard SATA output levels or with boosted output levels. Configure JU2 to enable/disable the host output boost and JU3 to enable/disable the device output boost (see Tables 4 and 5, respectively). Evaluates: MAX4951 MAX4951 Evaluation Kit Figure 1a. MAX4951 EV Kit Schematic (Sheet 1 of 3) 4 _______________________________________________________________________________________ MAX4951 Evaluation Kit Evaluates: MAX4951 Figure 1b. MAX4951 EV Kit Schematic (Sheet 2 of 3) _______________________________________________________________________________________ 5 Evaluates: MAX4951 MAX4951 Evaluation Kit Figure 1c. MAX4951 EV Kit Schematic (Sheet 3 of 3) 6 _______________________________________________________________________________________ MAX4951 Evaluation Kit Evaluates: MAX4951 Figure 2. MAX4951 EV Kit Component Placement Guide— Component Side Figure 3. MAX4951 EV Kit Component PCB Layout— Component Side _______________________________________________________________________________________ 7 Evaluates: MAX4951 MAX4951 Evaluation Kit Figure 4. MAX4951 EV Kit PCB Layout—Inner Layer 2 8 Figure 5. MAX4951 EV Kit PCB Layout—Inner Layer 3 _______________________________________________________________________________________ MAX4951 Evaluation Kit Evaluates: MAX4951 Figure 6. MAX4951 EV Kit PCB Layout—Solder 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 _____________________ 9 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.