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19-2714; Rev 0; 12/02
MAX5195 Evaluation Kit
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.
Features
o Fast Evaluation and Performance Testing o LVPECL Compatible o SMB Coaxial Connectors for Clock and Data Inputs o SMA Coaxial Connector for DAC Output o Differential Data Input Configuration o On-Board Differential-to-Single-Ended Output Conversion Circuitry o Fully Assembled and Tested
Evaluates: MAX5195
Ordering Information
PART MAX5195EVKIT TEMP RANGE 0C to +70C IC PACKAGE 48 QFN-EP*
*EP = Exposed paddle.
Component List
DESIGNATION QTY DESCRIPTION 10F 10%, 10V tantalum capacitors (A) AVX TAJA106K010R or Kemet T494A106K010AS 0.01F 10%, 16V X7R ceramic capacitors (0402) TDK C1005X7R1C103KT or Murata GRP155R71C103KA01 0.1F 10%, 10V X5R ceramic capacitors (0402) TDK C1005X5R1A104K or Murata GRP155R61A104KA01 47pF 10%, 50V COG ceramic capacitors (0402) TDK C1005COG1H470JT or Murata GRP1555C1H470JZ01 1F 10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K Not installed, capacitor (A) 2.2F 10%, 25V X7R ceramic capacitor (1206) TDK C3216X7R1E225K 1000pF 10%, 50V X7R ceramic capacitor (0402) TDK C1005X7R1H102KT or Murata GRP155R71H102KA01 DESIGNATION QTY C29 D0P/N-D13P/N, CLKN, CLKP JU1, JU2 L1, L2 R1-R15 R16, R17 R18, R19 R20 R21 R22 R23 T1 TP1-TP4 TP5 U1 U2 VOUT VOUTP, VOUTN None None 0 30 2 2 15 2 2 1 1 1 0 1 4 1 1 1 1 0 2 1 DESCRIPTION Not installed, capacitor (0402) SMB PC-mount vertical connectors 2-pin headers 5.6H inductors Coilcraft 1008PS-562M 100 1% resistors (0402) 3.83k 1% resistors (0603) 27.4 1% resistors (0402) 0 5% resistor (0603) 3.9k 5% resistor (0402) 6.8k 5% resistor (0402) Not installed, resistor (0402) Wideband RF transformer (1:1) Coilcraft TTWB1010-1 PC test points, red PC test point, black MAX5195EGM (48-pin QFN) 1.2 voltage reference (3-pin SOT23) MAX6120EUR SMA PC-mount vertical connector Not installed, SMA PC-mount vertical connectors Shunts (JU1, JU2) MAX5195 PC board
C1, C2
2
C3, C4
2
C5, C15, C18-C24, C26, C28
11
C6-C14
9
C16 C17 C25
1 0 1
C27
1
________________________________________________________________ Maxim Integrated Products
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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.
MAX5195 Evaluation Kit Evaluates: MAX5195
Component Suppliers
SUPPLIER AVX Coilcraft Kemet Murata Panasonic TDK PHONE 843-946-0238 847-639-6400 864-963-6300 770-436-1300 714-373-7366 847-803-6100 FAX 843-626-3123 847-639-1469 864-963-6322 770-436-3030 714-737-7323 847-390-4405 WEBSITE www.avxcorp.com www.coilcraft.com www.kemet.com www.murata.com www.panasonic.com 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) * Digital signal generator for LVPECL data inputs (e.g., Agilent 81250) * Spectrum analyzer (e.g., HP 8560E) * 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.
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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. 11) With a voltmeter, verify that 1.2V is measured at test point TP2 on the EV kit. 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. 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.
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MAX5195 Evaluation Kit
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
Table 1. Reference Selection (Jumper JU2)
SHUNT POSITION 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
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 100 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.
Not Installed
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 3.83k or 7.66k, which select a full-scale current of 20mA or 10mA, respectively. See Table 2 to configure jumper JU1 and select the full-scale current.
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.
Table 2. Selecting Full-Scale Current (Jumper JU1)
SHUNT POSITION Installed Not Installed FULL-SCALE CURRENT 20mA 10mA
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).
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 100 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.
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.
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MAX5195 Evaluation Kit Evaluates: MAX5195
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
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DVCC
DVCC
L1 5.6H
DGND DVCC AVCC R5 100 C6 47pF TP2 JU2 2 C29 OPEN GND 38 JU1 36 AVCC R16 3.83k C14 47pF D8P AMPOUT 4 D7N AVCC 5 D7P AVCC 6 CLKP U1 R8 100 CLKN 7 CLKN 30 AVCC AVCC D6P D5N 29 C11 47pF AGND AGND 11 D5P D4N 12 D4N D4P 13 DVCC R12 100 C7 47pF D3P C24 0.1F D2N R13 100 R14 100 R15 100 C27 1000pF 14 15 16 17 18 19 D3N D3P DVCC DGND D2N D2P D1N 20 D1P 21 D0N 22 REFOUT 28 27 26 AVCC AVCC D0P T.P. 23 24 25 C10 47pF C18 0.1F TP4 C28 0.1F DVCC C16 1F TP1 C15 0.1F C19 0.1F VOUTN OPEN D6N 8 R9 100 D6P 9 D5N 10 R10 100 D5P D6N OUTN OUTP C12 47pF 32 C20 0.1F VOUTP OPEN R18 27.4 AVCC CLKP AVCC C13 47pF 33 R7 100 D7P C17 OPEN C21 0.1F AVCC 34 C22 0.1F TP3 R17 3.83k D13N REFIN RSET 2 D8N AVCC 3 D7N 35 R6 100 D8P 37 C23 0.1F MAX6120 VOUT 3 R4 100 R3 100 R2 100 R1 100 C26 0.1F C5 0.1F U2 VIN 1 AVCC
C1 10F 10V C3 0.01F D9N D10P D10N D11P D11N D12P D12N D13P D13N C8 47pF
AVCC
L2 5.6H
AGND
TP5 48 D9P 1 D9N D9P DVCC DGND D10P D10N D11P D11N D12P D12N D13P 47 46 45 44 43 42 41 40 39
Figure 2. MAX5195 EV Kit Schematic
C4 0.01F C9 47pF D8N R20 0 R23 OPEN C25 2.2F
C2 10F 10V
MAX5195
31
VOUT 3 2 1 R19 27.4 4 5 6 AVCC
T1
R11 100
R21 3.9k 5% D2P D1N D1P D0N D0P R22 6.8k 5%
D4P
D3N
Evaluates: MAX5195
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*ALL RESISTORS ARE 1% UNLESS SPECIFIED.
MAX5195 Evaluation Kit
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MAX5195 Evaluation Kit Evaluates: MAX5195
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
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MAX5195 Evaluation Kit Evaluates: MAX5195
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
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MAX5195 Evaluation Kit Evaluates: MAX5195
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 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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