19-2714; Rev 0; 12/02 MAX5195 Evaluation Kit Features ♦ Fast Evaluation and Performance Testing ♦ LVPECL Compatible ♦ SMB Coaxial Connectors for Clock and Data Inputs ♦ SMA Coaxial Connector for DAC Output ♦ Differential Data Input Configuration ♦ On-Board Differential-to-Single-Ended Output Conversion Circuitry ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX5195EVKIT 0°C to +70°C IC PACKAGE 48 QFN-EP* *EP = Exposed paddle. Component List DESIGNATION QTY C1, C2 C3, C4 C5, C15, C18–C24, C26, C28 C6–C14 C16 DESCRIPTION 2 10µF ±10%, 10V tantalum capacitors (A) AVX TAJA106K010R or Kemet T494A106K010AS 2 0.01µF ±10%, 16V X7R ceramic capacitors (0402) TDK C1005X7R1C103KT or Murata GRP155R71C103KA01 11 9 1 DESIGNATION QTY DESCRIPTION C29 0 Not installed, capacitor (0402) D0P/N–D13P/N, CLKN, CLKP 30 SMB PC-mount vertical connectors JU1, JU2 2 2-pin headers L1, L2 2 5.6µH inductors Coilcraft 1008PS-562M R1–R15 15 100Ω ±1% resistors (0402) 0.1µF ±10%, 10V X5R ceramic capacitors (0402) TDK C1005X5R1A104K or Murata GRP155R61A104KA01 R16, R17 2 3.83kΩ ±1% resistors (0603) R18, R19 2 27.4Ω ±1% resistors (0402) R20 1 0Ω ±5% resistor (0603) R21 1 3.9kΩ ±5% resistor (0402) 47pF ±10%, 50V COG ceramic capacitors (0402) TDK C1005COG1H470JT or Murata GRP1555C1H470JZ01 R22 1 6.8kΩ ±5% resistor (0402) R23 0 Not installed, resistor (0402) T1 1 Wideband RF transformer (1:1) Coilcraft TTWB1010-1 TP1–TP4 4 PC test points, red TP5 1 PC test point, black 1 MAX5195EGM (48-pin QFN) 1µF ±10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K C17 0 Not installed, capacitor (A) U1 1 1 2.2µF ±10%, 25V X7R ceramic capacitor (1206) TDK C3216X7R1E225K U2 C25 1.2 voltage reference (3-pin SOT23) MAX6120EUR VOUT 1 SMA PC-mount vertical connector VOUTP, VOUTN 0 Not installed, SMA PC-mount vertical connectors None 2 Shunts (JU1, JU2) None 1 MAX5195 PC board C27 1 1000pF ±10%, 50V X7R ceramic capacitor (0402) TDK C1005X7R1H102KT or Murata GRP155R71H102KA01 ________________________________________________________________ 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. 1 Evaluates: MAX5195 General Description The MAX5195 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX5195 14-bit, 260MHz digital-to-analog converter (DAC). The EV kit requires LVPECL-compatible data and clock inputs and two 5V power supplies for simple board operation and optimum performance. Evaluates: MAX5195 MAX5195 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX WEBSITE AVX 843-946-0238 843-626-3123 Coilcraft 847-639-6400 847-639-1469 www.coilcraft.com Kemet 864-963-6300 864-963-6322 www.kemet.com www.avxcorp.com Murata 770-436-1300 770-436-3030 www.murata.com Panasonic 714-373-7366 714-737-7323 www.panasonic.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Please indicate that you are using the MAX5195 when contacting these component suppliers. Quick Start Recommended equipment: • DC power supplies Digital: 5.0V, 300mA Analog: 5.0V, 100mA • Function generator with low-phase noise and low jitter for clock input (e.g., HP 8662A) 7) Connect the spectrum analyzer to the VOUT SMA connector. 8) Connect the 5.0V, 300mA power supply to DVCC. Connect the ground terminal of this supply to DGND. 9) Connect the 5.0V, 100mA power supply to AVCC. Connect the ground terminal of this supply to AGND. 10) Turn on both power supplies. • Digital signal generator for LVPECL data inputs (e.g., Agilent 81250) 11) With a voltmeter, verify that 1.2V is measured at test point TP2 on the EV kit. • Spectrum analyzer (e.g., HP 8560E) 12) Enable the function generator and the digital signal generator. Set the function generator (HP 8662A) for an output amplitude of +12dBm and frequency (fCLK) ≤ 520MHz. Set the digital signal generator for clock frequency of 260MHz. • Digital voltmeter The MAX5195 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on power supplies or enable signal generators until all connections are completed. 1) To set full-scale current to 20mA, verify that shunt is installed across jumper JU1 or remove the shunt across jumper JU1 to set the full-scale current to 10mA. 2) Verify that a shunt is installed across jumper JU2 to use the 1.2V on-board external reference. 3) Synchronize the clock function generator (HP 8662A) to the CLOCK/REF input of the digital signal generator (Agilent 81250). See Figure 1 for equipment setup. 4) Verify that the digital signal generator is programmed for LVPECL-level outputs, which transition from 1.6V to 2.4V. 5) Connect the differential clock signal output from the digital signal generator to the CLKP (positive rail) and CLKN (complementary rail) SMB connectors on the EV kit. 6) Connect the 14-bit differential LVPECL outputs from the digital signal generator to the SMB input connectors on the EV kit. Connect the differential bit 0 to D0P and D0N, connect the differential bit 1 to D1P and D1N, etc. 2 13) Use the spectrum analyzer to view the MAX5195 output spectrum or view the output waveform using an oscilloscope on VOUT. Note: Set the Agilent 81250’s internal divider to generate a 260MHz signal from the HP 8662A’s 520MHz synchronous signal. Detailed Description The MAX5195 EV kit is designed to simplify the evaluation of the MAX5195 14-bit, 260MHz DAC. The board contains all circuitry necessary to evaluate the dynamic performance of this high-speed converter, including the circuit to convert the DAC’s differential output into a single-ended output. The EV kit provides connector pads for power supplies (DVCC and AVCC) and SMA/SMB connectors for the digital and clock differential LVPECL inputs (D0P/N–D13P/N, CLKP, CLKN), and the DAC output (VOUT) to simplify connection to the EV kit. The four-layer PC board is a high-speed design that optimizes the dynamic performance of the DAC by separating the analog and digital circuitry and implementing impedance matching to the differential input signal lines. _______________________________________________________________________________________ MAX5195 Evaluation Kit Digital Inputs The MAX5195 EV kit provides high-frequency SMB connectors for the 14-bit, differential LVPECL input signal lines. Each differential matched-impedance pair features an on-board 100Ω termination resistor located near the DAC. The digital signal source must be programmed to supply differential LVPECL-standard logic levels with valid voltage levels of 1.6V and 2.4V. Connect each differential output bit from the digital signal generator to its corresponding SMB connector. Connect D0P–D13P to the positive signal connectors and their complementary signals to the D0N–D13N SMB connectors. DAC Output The MAX5195 is designed to supply a 0.5VP-P to 1VP-P differential output voltage range. This differential voltage is then used to drive transformer T1 to convert the differential voltage into a single-ended voltage that can be sampled at the VOUT SMA connector. Clock The MAX5195 EV kit requires an LVPECL differential clock signal input. The clock signal must be connected to the CLKP (positive rail) and CLKN (complementary rail) SMB connectors. The minimum clock frequency must follow the Nyquist criteria (fCLK ≥ 2 ✕ fOUT). Reference Voltage Options The MAX5195 requires an input voltage reference at its REFIN pin to set the full-scale analog signal voltage output. The EV kit circuit is designed with a 1.2V temperature stable, external voltage reference source (U2, MAX6120) that can be used in place of the internal reference provided by the MAX5195. The EV kit can be configured to use the on-board external reference by installing a shunt across jumper JU2. The user can also externally adjust the full-scale range by removing the shunt across jumper JU2 and supplying a stable, lownoise, external voltage reference to test point TP2. See Table 1 for jumper JU2 configuration. The DAC also has a stable on-chip bandgap reference of 1.2V that can be accessed at test point TP1. To use the on-chip voltage reference, remove the shunt across jumper JU2, and connect test point TP1 to TP2. Table 1. Reference Selection (Jumper JU2) SHUNT POSITION Installed Not Installed REFERENCE MODE External 1.2V reference (U2) connected to REFIN pin on U1 User must supply a voltage reference to TP2 or use the internal 1.2V bandgap reference by connecting TP1 to TP2 Full-Scale Current The MAX5195 DAC requires an external resistor connected from the RSET pin to ground to set the converter’s full-scale current. The EV kit circuit is designed with a resistor option that allows the user to set the resistance value to 3.83kΩ or 7.66kΩ, which select a full-scale current of 20mA or 10mA, respectively. See Table 2 to configure jumper JU1 and select the full-scale current. Table 2. Selecting Full-Scale Current (Jumper JU1) SHUNT POSITION FULL-SCALE CURRENT Installed 20mA Not Installed 10mA Board Layout The MAX5195 EV kit is a four-layer PC board design optimized for high-speed signals. All high-speed differential signals are routed through 100Ω impedancematched differential transmission lines. The digital inputs are arranged in a circular pattern to match the line lengths between the DAC inputs. The length of these transmission lines is matched to within 50 mils to minimize layout-dependent data skew. The board layout separates the analog and digital portions of the circuit. _______________________________________________________________________________________ 3 Evaluates: MAX5195 Power Supplies The MAX5195 EV kit requires separate analog and digital power supplies for best performance. Connect a 5.0V power supply to the DVCC PC board pad on the EV kit to power the digital portion of the MAX5195 and the clock signal circuit. Connect the other 5.0V power supply to the AVCC PC board pad on the EV kit to power the analog portion of the DAC. Evaluates: MAX5195 MAX5195 Evaluation Kit * HP 8662A RF SIGNAL OUTPUT AGILENT 81250 CLKP CLOCK SIGNALS (TO BE CONNECTED TO THE MAX5195 EV KIT) CLKN CLOCK/REF INPUT DIFFERENTIAL DATA OUTPUTS (TO BE CONNECTED TO THE MAX5195 EV KIT) *HP 8662A RF SIGNAL OUTPUT USED TO SYNCHRONIZE AGILENT 81250 TO THE HP 8662A. Figure 1. Data and Clock Equipment Setup for the MAX5195 EV Kit 4 _______________________________________________________________________________________ TP5 L2 5.6µH C2 10µF 10V C1 10µF 10V *ALL RESISTORS ARE 1% UNLESS SPECIFIED. AGND AVCC DGND L1 5.6µH D8P C4 0.01µF C3 0.01µF D5P D6P CLKN D7P D8N D4N D5N D6N CLKP D7N D9P C9 47pF AVCC C8 47pF DVCC R11 100Ω R10 100Ω R9 100Ω R8 100Ω R7 100Ω R6 100Ω R5 100Ω 12 11 10 9 8 7 6 5 4 3 2 1 D3N 14 D3N 13 D4P DVCC 47 DVCC D4P D4N D5P D5N D6P D6N CLKN CLKP D7P D7N D8P D8N D9N D9P 48 D9N R12 100Ω 45 16 DVCC D10P C5 0.1µF DVCC D3P 15 D3P DGND 46 C6 47pF 17 DGND C7 47pF 43 D2N 18 D2N D2P 19 D2P R13 100Ω MAX5195 U1 42 D11N D11N R3 100Ω D11P D11P C24 0.1µF 44 D10N D10N R4 100Ω D10P 41 D1N 20 D1N D12P 40 D12N R14 100Ω D1P 21 D1P D12N R2 100Ω D12P 39 D0N 22 D0N D13P 38 37 D13N R15 100Ω D0P 23 24 AVCC D0P T.P. REFOUT AGND AGND AVCC OUTN OUTP AVCC AVCC AMPOUT AVCC RSET D13N REFIN R1 100Ω D13P 25 26 27 28 29 30 31 32 33 34 35 36 AVCC AVCC AVCC R16 3.83kΩ C27 1000pF C10 47pF C11 47pF C12 47pF AVCC R17 3.83kΩ JU1 TP2 C28 0.1µF TP4 C18 0.1µF C19 0.1µF C20 0.1µF C13 47pF C14 47pF VOUTN OPEN DVCC C16 1µF C21 0.1µF C17 OPEN R22 6.8kΩ 5% R21 3.9kΩ 5% C22 0.1µF TP3 VOUTP OPEN AVCC C23 0.1µF JU2 R18 27.4Ω C15 0.1µF TP1 R19 27.4Ω 1 3 2 R20 0Ω R23 OPEN C29 OPEN 2 U2 6 4 5 T1 AVCC AVCC 3 VOUT GND VIN C25 2.2µF MAX6120 VOUT AVCC 1 C26 0.1µF Evaluates: MAX5195 DVCC MAX5195 Evaluation Kit Figure 2. MAX5195 EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX5195 MAX5195 Evaluation Kit Figure 3. MAX5195 EV Kit Component Placement Guide—Component Side 6 _______________________________________________________________________________________ MAX5195 Evaluation Kit Evaluates: MAX5195 Figure 4. MAX5195 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 7 Evaluates: MAX5195 MAX5195 Evaluation Kit Figure 5. MAX5195 EV Kit PC Board Layout—Ground Planes 8 _______________________________________________________________________________________ MAX5195 Evaluation Kit Evaluates: MAX5195 Figure 6. MAX5195 EV Kit PC Board Layout—Power Planes _______________________________________________________________________________________ 9 Evaluates: MAX5195 MAX5195 Evaluation Kit Figure 7. MAX5195 EV Kit PC Board Layout—Solder Side 10 ______________________________________________________________________________________ MAX5195 Evaluation Kit Evaluates: MAX5195 Figure 8. MAX5195 EV Kit Component Placement Guide—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 ____________________ 11 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.