MAX1448EVKIT

19-1799; Rev 2; 11/03 MAX1448 Evaluation Kit Features ♦ Up to 80Msps Sampling Rate ♦ Low-Voltage, Low-Power Operation ♦ Single-Ended or Fully Differential Signal Input Configuration ♦ Clock-Shaping Circuit ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX1448EVKIT 0°C to +70°C IC PACKAGE 32 TQFP Component List DESIGNATION QTY C1, C2, C4–C8, C10,C16–C20, C22, C27, C33–C39 22 C3, C9 2 C11, C21, C24, C26, C28, C29, C31, C32 8 C12–C15 4 DESCRIPTION DESIGNATION QTY 0.1µF, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG or equivalent R4, R5, R38 3 R8, R24–R33 11 100Ω ±1% resistors (0805) R9, R10, R36 3 2kΩ ±1% resistors (0805) R11 1 6.04kΩ ±1% resistor (0805) R12, R37 2 4.02kΩ ±1% resistors (0805) R40 1 10kΩ ±1% resistor (0805) R41 1 3.9Ω ±5% resistor (0805) 2.2µF,10V tantalum capacitors (A) AVX TAJA225K010 or Kemet T494A225K010AS R34 1 5kΩ potentiometer T1 1 RF transformer Mini-Circuits ADT1-1WT 10µF, 10V tantalum capacitors (B) AVX TAJB106M010 or Kemet T494B106K010AS U1 1 MAX1448EHJ (32-pin TQFP) U2 1 Dual CMOS differential line receiver (8-pin SO) Maxim MAX9113ESA U3 1 Buffer/driver 3-state output (48-pin TSSOP) Texas Instruments SN74ALVCH16244DGG or Pericom PI74ALVCH16244A SINGLE, DIFF, CLOCK 3 SMA PC-mount connectors None 4 Shunts (JU1 to JU4) None 1 MAX1448 PC board 10pF, 200V ceramic capacitors (0805) Murata GQM2195C2A100JB01 C23, C30 0 Not installed (0805) C25 1 1000pF, 50V COG ceramic capacitor (0805) Murata GRM2195C1H102JA01 J1 1 2 × 20-pin header JU1, JU2 2 2-pin headers JU3, JU4 2 3-pin headers 2 Ferrite chip beads (1206) Fair-Rite Products Corp. 2512069007Y0 or HiQ Magnetics 436-2600 L1, L2 DESCRIPTION 24.9Ω ±1% resistors (0805) R1, R39 0 Not installed (0805) R2, R3, R13–R23, R35 14 49.9Ω ±1% resistors (0805) None 1 MAX1448 data sheet None 1 MAX1448 EV kit data sheet ________________________________________________________________ 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: MAX1444/MAX1446/MAX1448/MAX1449 General Description The MAX1448 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX1444, MAX1446, MAX1448, or MAX1449 10-bit analog-to-digital converters (ADCs). The MAX1444/MAX1446/MAX1448/ MAX1449 ADCs process differential or single-ended analog inputs. The EV kit allows the user to evaluate the ADCs with both types of signals from one single-ended analog signal. The digital output produced by the ADCs can be easily sampled with a user-provided high-speed logic analyzer or data-acquisition system. The EV kit comes with the MAX1448 installed. Order free samples of the MAX1444EHJ, MAX1446EHJ or MAX1449EHJ to evaluate these parts. The EV kit operates from a +3V power supply. It includes circuitry that generates a clock signal from an AC signal provided by the user. Evaluates: MAX1444/MAX1446/MAX1448/MAX1449 MAX1448 Evaluation Kit Part Selection Table PART SPEED (Msps) MAX1444EHJ 40 MAX1446EHJ 60 MAX1448EHJ 80 MAX1449EHJ 105 3) 4) 5) Component Suppliers SUPPLIER PHONE FAX AVX 843-448-9411 843-448-1943 Fair-Rite Products 888-324-7748 888-337-7483 Kemet 864-963-6300 864-963-6322 Mini-Circuits 718-934-4500 718-934-7092 Murata 770-436-1300 770-436-3030 Pericom 800-435-2336 408-435-1100 Taiyo Yuden 800-348-2496 847-925-0899 Texas Instruments 972-644-5580 214-480-7800 Note: Please indicate that you are using the MAX1448, MAX1444, MAX1446, or MAX1449 when contacting these component suppliers. Quick Start • DC power supplies: Digital = +3V, 100mA Required Equipment Analog = +3V, 100mA • A function generator with low phase noise and low jitter for clock input (e.g., HP 8662A) • A function generator for analog signal input (e.g., HP 8662A) • A logic analyzer or data-acquisition system (e.g., HP 1663EP, HP 16500C) • An analog bandpass filter (e.g., TTE elliptical function bandpass filter Q56 series) • A digital voltmeter The MAX1448 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 function generators until all connections are completed. 1) Connect one +3V power supply to VAIN1 and VAIN2. Connect the ground terminal of this supply to AGND. 2) Connect one +3V power supply to VDIN1 and 2 6) 7) 8) 9) VDIN2. Connect the ground terminal of this supply to DGND. Verify that shunts are not installed in jumpers JU1 (MAX1448 enabled) and JU2 (MAX1448 output enabled). Connect the clock function generator to the CLOCK SMA connector. Connect the output of the analog signal function generator to the input of the bandpass filter. To evaluate differential analog signals, verify that shunts are installed on pins 1 and 2 of jumpers JU3 and JU4. Connect the output of the bandpass filter to the DIFF SMA connector. For single-ended analog signal evaluation, verify that shunts are installed on pins 2 and 3 of jumpers JU3 and JU4, and connect the output of the bandpass filter to the SINGLE SMA connector. Connect the logic analyzer to the square pin header (J1). Turn on both power supplies. With a voltmeter, verify that +1.20V is measured across test points TP4 and TP5. If the voltage is not +1.20V, adjust potentiometer R34 until +1.20V is obtained. 10) Enable the function generators. Set the clock function generator to 2.4VP-P and frequency (fCLK) ≤ 80MHz. Set the analog signal function generator to 2VP-P and desired frequency. The two function generators should be phase locked to each other. 11) Set the logic analyzer to latch data on the clock’s rising edge. 12) Enable the logic analyzer. 13) Collect data using the logic analyzer. Detailed Description The MAX1448 EV kit is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX1449, MAX1448, MAX1446, or MAX1444 10-bit ADC at a maximum clock frequency (fCLK) of 80MHz. These ADCs can process differential or single-ended analog inputs. With the proper board configuration, the user can evaluate the ADC with both types of signals by supplying only one singleended analog signal to the EV kit. The EV kit’s PC board is designed as a four-layer board to optimize the performance of the MAX1448. Separate analog and digital power planes minimize noise coupling between analog and digital signals. For simple operation, the EV kit is specified to have +3V power _______________________________________________________________________________________ MAX1448 Evaluation Kit Power Supplies The MAX1448 EV kit requires separate analog and digital power supplies for best performance. A +3V power supply is used to power the analog portion of the MAX1449/MAX1448/MAX1446/MAX1444 ADC and the clock signal circuit. The MAX1449/MAX1448/ MAX1446/MAX1444 analog supply voltage has a range of +2.7V to +3.3V; however, +3V must be supplied to the EV kit (VAIN1, VAIN2) to meet the minimum input voltage supply to the clock signal generator. A separate +3.0V power supply is used to power the digital portion (VDIN1, VDIN2) of the MAX1448 ADC and the buffer/driver, but it will operate with a voltage supply as low as +1.7V and as high as +3.3V. Enhanced dynamic performance can be achieved when the digital supply voltage is lower than the analog supply voltage. Clock An on-board clock-shaping circuit generates a clock signal from an AC sine-wave signal applied to the CLOCK SMA connector. The signal should not exceed 2.6VP-P. The typical clock frequency should be 80MHz or less. The frequency of the sinusoidal input signal determines the sampling frequency of the ADC. A DS90LV028A differential line receiver processes the input signal to produce the CMOS clock signal. The signal’s duty cycle can be adjusted with potentiometer R34. A clock signal with a 50% duty cycle can be achieved by adjusting R34 until +1.2V is produced across test points TP4 and TP5 at +3V analog voltage supply (40% of the analog power supply). Input Signal The MAX1448 ADC is able to process differential or single-ended analog input signals. The EV kit requires only one single-ended analog input signal provided by the user. During single-ended signal operation, the signal is applied directly to the ADC, and in differential signal operation, an on-board transformer takes the singleended analog signal and generates a differential analog signal at the ADC’s differential input pins. For singleended or differential signal board operation, see Table 1 for jumper configuration. Note: When a differential signal is applied to the ADC, its positive and negative input pins each receive half of the input signal supplied at SMA connector DIFF centered at (VAIN1) / 2. MAX1448 Enable/Shutdown The MAX1448 EV kit features jumpers to enable and disable the MAX1448 (JU1) or its digital outputs (JU2). See Table 1 for jumper settings. External Voltage Reference The MAX1448 ADC requires an input voltage reference at pin 31 (REFIN) to set the full-scale analog signal voltage input. The ADC also has a stable on-chip voltage reference of +2.048V that can be accessed at REFOUT. The EV kit was designed to use the on-chip voltage reference by connecting REFIN to REFOUT through resistor R40. The user can externally adjust the reference level, and hence the full-scale range, by installing a resistor at R39. The adjusted reference level can be calculated by applying the following equation; VREFIN = (R39 / (R40 + R39)) x VREFOUT where R39 is the value of the resistor installed, R40 is a 10kΩ resistor, and VREFOUT is +2.048V. Alternatively, the user can also apply a stable, low-noise, external reference voltage directly at the REFIN pad to set the full scale. Table 1. MAX1448 EV Kit Jumper Selection JUMPER JU1 JU2 SHUNT STATUS CLOSED OPEN CLOSED PIN CONNECTION EV KIT OPERATION PD connected to VDDUT MAX1448 is disabled (powered down) PD connected internally to GND MAX1448 is enabled OE connected to VDDUT MAX1448 digital outputs are disabled OE connected internally to GND MAX1448 digital outputs are enabled 1 and 2 IN+ and IN- pins connected to SMA connector DIFF Analog input signal is coupled into the ADC as a differential input 2 and 3 IN+ pin connected to SMA connector SINGLE and IN- pin connected to COM pin Analog input signal is coupled into the ADC as a single-ended input OPEN JU3, JU4 _______________________________________________________________________________________ 3 Evaluates: MAX1444/MAX1446/MAX1448/MAX1449 supplies applied to analog and digital power planes. However, the digital supply can be operated down to +1.7V without compromising the board’s performance. The logic analyzer’s threshold should be adjusted accordingly. Access to the output is provided through connector J1. The 40-pin connector can easily interface directly to a user-provided logic analyzer or data-acquisition system. Figure 1. MAX1448 EV Kit Schematic _______________________________________________________________________________________ TP5 R36 2kΩ CLOCK R34 3 5kΩ 2 1 C22 0.1µF R35 49.9Ω C4 0.1µF TP4 6 1 4 5 T1 R1 OPEN 2 3 R37 4.02kΩ R3 49.9Ω C2 0.1µF R2 49.9Ω R12 4.02kΩ R11 6.04kΩ R4 24.9Ω R5 24.9Ω 3 2 4 1 C25 1000pF VADUT R38 24.9Ω IN2+ IN1+ IN2- GND OUT2 OUT1 VCC U2 MAX9113 IN1- C32 2.2µF 10V 1 3 JU4 2 1 3 JU3 2 C10 0.1µF R10 2kΩ R9 2kΩ 5 6 7 8 R8, 100Ω C33 0.1µF C3 10pF C9 10pF C28 2.2µF 10V C27 0.1µF C6 0.1µF C5 0.1µF C26 2.2µF 10V C29 2.2µF 10V C7 0.1µF R39 OPEN C24 2.2µF 10V C14 DGND 10µF 10V C13 VDIN2 10µF 10V VDIN1 TP3 TP2 TP1 NOTE: ALL RESISTORS ARE 0805 1% UNLESS OTHERWISE NOTED. VA DIFF SINGLE C1 0.1µF C23 OPEN GND IN- IN+ GND GND VDD COM REFN C18 0.1µF C19 0.1µF C11 2.2µF 10V 8 7 6 5 4 3 2 1 C8 0.1µF R40 10kΩ 9 REFIN 32 REFP VDD 31 REFIN VDD 30 VDDUT VD C38 0.1µF 10 U1 28 29 MAX1448 GND GND 11 REFOUT R41 3.9Ω JU1 CLK 12 27 D4 D8 D7 D6 D5 OVDD T.P. OGND VA VADUT JU2 D0 PD 13 25 D3 D9 26 D1 GND 14 D2 OE 15 4 16 17 18 19 20 21 22 23 24 VDDUT OVDD OVDD C12 10µF 10V C15 10µF 10V DGND VDIN1 C20 0.1µF C16 0.1µF VDIN2 C17 0.1µF C30 OPEN C35 0.1µF R24, 100Ω R25, 100Ω R26, 100Ω R27, 100Ω R28, 100Ω R29, 100Ω C34 0.1µF R30, 100Ω R31, 100Ω R32, 100Ω R33, 100Ω C31 2.2µF 10V C39 0.1µF 1A1 1A2 GND 1A3 1A4 VCC 2A1 2A2 GND 2A3 2A4 3A1 3A2 GND 3A3 3A4 VCC 4A1 4A2 GND 4A3 4A4 3DE 48 2DE 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VD 13 14 15 16 17 18 19 20 21 22 23 24 1DE 1Y1 1Y2 GND 1Y3 1Y4 VCC 2Y1 2Y2 GND 2Y3 1 2 3 4 5 6 7 8 9 10 11 2Y4 12 3Y1 3Y2 GND 3Y3 3Y4 VCC 4Y1 4Y2 GND 4Y3 4Y4 4DE U3 SN74ALVCH16244 L1 C21 2.2µF 10V L2 C36 0.1µF VDDUT R13, 49.9Ω C37 0.1µF R15, 49.9Ω R17, 49.9Ω R19, 49.9Ω R21, 49.9Ω R14, 49.9Ω R16, 49.9Ω R18, 49.9Ω R20, 49.9Ω R22, 49.9Ω R23, 49.9Ω J1-21 J1-19 J1-17 J1-15 J1-13 J1-11 J1-9 J1-7 J1-5 J1-3 J1-1 J1-40 J1-39 J1-37 J1-38 J1-35 J1-36 J1-33 J1-34 J1-32 J1-31 J1-30 J1-28 J1-29 J1-27 J1-26 J1-25 J1-24 J1-23 J1-22 J1-20 J1-18 J1-16 J1-14 J1-12 J1-10 J1-8 J1-6 J1-4 J1-2 Evaluates: MAX1444/MAX1446/MAX1448/MAX1449 MAX1448 Evaluation Kit MAX1448 Evaluation Kit 1.0" without compromising the digital output signal. The outputs of the buffer are connected to a 40-pin header (J1) located on the right side of the EV kit where the user can connect a logic analyzer or data-acquisition system. 1.0" Figure 2. MAX1448EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX1448EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX1448EV Kit PC Board Layout—Solder Side Figure 5. MAX1448EV Kit Component Placement Guide— Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX1444/MAX1446/MAX1448/MAX1449 Output Buffer/Driver The SN74ALVCH16244 buffer/driver buffers the MAX1448’s digital output, which produces straight offset binary data. The buffer is able to drive capacitive loads, which may be present at the logic analyzer connection, Evaluates: MAX1444/MAX1446/MAX1448/MAX1449 MAX1448 Evaluation Kit 1.0" 1.0" Figure 6. MAX1448EV Kit PC Layout—Ground Planes Figure 7. MAX1448EV Kit PC Layout—Power Planes 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.