MAX1420EVKIT

19-2058; Rev 0; 5/01 MAX1420 Evaluation Kit Features ♦ Up to 60Msps Sampling Rate ♦ Low Voltage, Low Power Operation ♦ Clock-Shaping Circuitry ♦ Easy Data Capture Configuration ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX1420EVKIT 0°C to +70°C IC PACKAGE 48 TQFP Component List DESIGNATION C1, C3, C39, C52 C2, C4, C38 C5, C7, C10, C14, C16, C18, C19, C29, C31, C33, C46, C50 C6, C8, C9, C11, C13, C15, C17, C20, C22, C24, C26, C28, C30, C32, C34, C42, C51, C53 QTY 4 3 12 18 C12, C21, C23, C25, C27, C41, C47, C48, C56 9 C35, C43, C44, C45 4 DESCRIPTION 1.0µF, 16V, X7R, 1206 ceramic capacitors Taiyo Yuden EMK316BJ105KF Murata GRM42-6X7R105K016 TDK C3216X7R1C105M 10µF, 6.3V, X5R, 1206 ceramic capacitors Taiyo Yuden JMK316BJ106KL Murata GRM42-6X5R106K6.3 TDK C3216X5R0J106K 0.1µF, 16V, X7R, 0603 ceramic capacitors Taiyo Yuden EMK107BJ104KA Murata GRM39X7R104K016 TDK C1608X7R1C104K 1000pF, 50V, X7R, 0402 ceramic capacitors 0.22µF, 10V, X7R, 0603 ceramic capacitors Taiyo Yuden LMK107BJ224KA Murata GRM39X7R224K010 DESIGNATION QTY DESCRIPTION C36, C37, C55, C57, C59, C60 0 Not installed C40 1 0.01µF, 50V, X7R, 0603 ceramic capacitor C49 1 2200pF, 50V, X7R, 0603 ceramic capacitor C54, C58 2 1.0µF, 10V, X7R, 0805 ceramic capacitors Taiyo Yuden LMK212BJ105KG Murata GRM40X7R105K010 TDK C2012X7R1A105K J1 1 2 ✕ 13-pin header J2, J3 2 SMA connectors, vertical PCmount JU1, JU2 2 3-pin headers JU3 0 Not installed L1, L2, L3 3 Ferrite chip beads, 1206 Fair-Rite Products Corp. 2512069007Y0 R1, R2 2 10Ω ±5%, 1206 resistors R3, R4, R5, R18, R23, R28–R40 18 49.9Ω ±1%, 0603 resistors R6–R17 12 100Ω ±1%, 0603 resistors 22pF, 50V, COG, 0402 ceramic capacitors ________________________________________________________________ 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: MAX1420/MAX1421/MAX1422 General Description The MAX1420 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX1420, MAX1421, or MAX1422, 12-bit, +3.3V, analog-to-digital converters (ADCs). The MAX1420/ MAX1421/MAX1422 ADCs accept 2Vp-p differential analog inputs. The offset binary digital output produced by the ADC can be easily sampled with a user-provided high-speed logic analyzer or data-acquisition system. The EV kit comes with the 60Msps part (MAX1420) installed. Order a free sample of the MAX1421CCM or MAX1422CCM to evaluate the 40Msps or 20Msps parts. MAX1420 Evaluation Kit Evaluates: MAX1420/MAX1421/MAX1422 Component List (continued) DESIGNATION QTY R19, R20, R24, R25 4 DESCRIPTION Quick Start • DC power supplies Digital (+3.3V, 100mA) 10kΩ ±5%, 0805 resistors Analog (+3.3V, 100mA) • Function generator with low-phase noise and lowjitter for clock input (e.g., HP 8662A or equivalent) R21, R22, R26, R27 4 24.9Ω ±1%, 0805 resistors R41 1 820Ω ±1%, 0805 resistor R42 1 620Ω ±1%, 0805 resistor • Function generator for analog signal input (e.g., HP 8662A or equivalent) R43 0 Resistor not installed (short PC trace) • Logic analyzer or data-acquisition system (e.g., HP 1663EP, HP 16500C or equivalent) T1, T2 2 RF transformers Mini-Circuits T1-1T-KK81 Coilcraft WB2010-1-SM • Bandpass filter selected for the input frequency of interest (e.g., TTE Q56 series or equivalent) U1 1 MAX1420CCM, 48-pin TQFP 1 16-bit buffer/driver three-state output, 48-pin TSSOP IDT 74ALVC16244APA Texas Instruments SN74ALVCH16244ADGGR U2 The MAX1420 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Verify that the shunts are installed in the following positions: JU1 (2-3) JU2 (2-3) 2) Connect the clock function generator to the CLKIN SMA connector. Component Suppliers SUPPLIER Coilcraft PHONE 847-639-6400 FAX 847-639-1469 4) Connect the output of the filter to the analog input SMA connector (VIN) of the MAX1420 EV kit. Fair-Rite Products 888-324-7748 888-337-7483 IDT 800-345-7015 408-492-8674 5) Connect the logic analyzer to the square pin header (J1), where D11 is the MSB and D0 is the LSB. Mini-Circuits 718-934-4500 718-934-7092 Murata 814-237-1431 814-238-0490 Taiyo Yuden 408-573-4150 408-573-4159 TDK 847-803-6100 847-803-6296 7) Connect a +3.3V power supply to DVDD1. Connect the ground terminal of this supply to DGND. Texas Instruments 972-644-5580 214-480-7800 8) Turn on both power supplies. Part Selection Table 2 3) Connect the output of the analog signal function generator to the input of the bandpass filter. PART SPEED (Msps) MAX1420CCM 60 MAX1421CCM 40 MAX1422CCM 20 6) Connect a +3.3V power supply to AVDD and VS+. Connect the ground terminal of this supply to AGND. 9) Enable the function generators. Set the clock function generator to 2Vp-p and frequency ≤ 60MHz. Set the analog signal function generator to 2Vp-p and the desired frequency. The function generators should be phase locked to ensure optimum performance. 10) Set the logic analyzer to capture data on the rising edge of the clock. 11) Collect and evaluate the data using the logic analyzer. _______________________________________________________________________________________ MAX1420 Evaluation Kit The MAX1420 EV kit is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX1420, MAX1421, or MAX1422, 12-bit ADC at a maximum clock frequency of 60MHz. The EV kit is designed using a four-layer architecture, to optimize the performance of the MAX1420. Separate, nonoverlapping, analog and digital power planes minimize noise coupling between analog and digital signals. For simple operation, the EV kit is specified to have +3.3V power supplies applied to analog and digital power planes. However, the digital supply can be operated down to +2.7V without compromising the board’s performance. The logic analyzer’s threshold should be adjusted accordingly. Access to the digital outputs and the capture clock is provided through connector J1. The 26-pin connector interfaces directly to a user-provided logic analyzer or data-acquisition system. Power Supplies The MAX1420 EV kit requires separate analog and digital power supplies for best performance. A +3.3V power supply is used to power the analog portion (AVDD) of the MAX1420/MAX1421/MAX1422. A second separate +3.3V power supply is used to power the digital portion (DVDD1) of the MAX1420 and the buffer/driver, but it will work with a supply as low as +2.7V and as high as +3.6V. Enhanced dynamic performance can be achieved when the digital supply voltage is lower than the analog supply voltage. Input Signal The MAX1420 EV kit requires a single-ended analog input signal. This single-ended signal is converted to a differential signal by transformer T1. This differential Table 1. Jumper JU1 and JU2 Functions JUMPER JU1 SHUNT LOCATION FUNCTION 1-2 MAX1420 in power-down mode 2-3 MAX1420 operational 1-2 Digital outputs D0–D11 disabled (high impedance) 2-3 Digital outputs D0–D11 enabled signal is applied to the input pins (INP and INN) of the MAX1420. Both input pins receive half of the input signal swing applied at the SMA connector VIN centered at (VS+/2). MAX1420 Enable and Power-Down The MAX1420 EV kit features jumpers to enable and power-down the MAX1420 (JU1) or enable/disable its digital outputs (JU2). See Table 1 for jumper settings. Voltage Reference The MAX1420 requires a voltage reference to set the full-scale analog input range. The MAX1420 provides three modes of operation to set the reference voltage. In internal reference mode, the on-chip +2.048V bandgap reference is used. The pads CMLT, REFNT, REFPT, and REFIN must be left floating in this mode. In buffered external reference mode, a stable and accurate voltage must be applied at the REFIN pad to set the reference voltage. The pads CMLT, REFNT, and REFPT must be left floating in this mode. Connecting REFIN to AGND activates the unbuffered external reference mode. In this mode, the full-scale input range is determined by the voltage difference (VDIFF) between the pads REFPT and REFNT. In this mode, CMLT must be biased between +1.568V to +1.733V. REFPT and REFNT should be biased to V CMLT + (V DIFF/2) and VCMLT - (VDIFF/2), respectively. Output Buffer/Driver The 74ALVC16244 buffers the MAX1420’s digital outputs, and is able to drive capacitive loads without compromising the MAX1420’s dynamic performance. The outputs of the buffer are connected to a 26-pin header (J1) located on the right side of the EV kit, where the user can connect a logic analyzer or data-acquisition system. Clock The MAX1420 EV kit requires a single-ended sinusoidal clock input signal. This single-ended signal is converted to a differential signal by transformer T2. The differential signal is then applied to the clock pins (CLK and CLK) of the MAX1420. The clock frequency determines the sampling rate of the MAX1420. The frequency should be between 100kHz and 60MHz. The clock signal is also connected through the 74ALVC16244 to the 26-pin header J1, to be used by a logic analyzer or data-acquisition system. JU2 _______________________________________________________________________________________ 3 Evaluates: MAX1420/MAX1421/MAX1422 Detailed Description VS+ C38 10µF VIN J2 C39 1µF R18 49.9Ω AGND AVDD C40 0.01µF 4 3 6 5 T1 C33 0.1µF C31 0.1µF AVDD C7 0.1µF C5 0.1µF C41 0.22µF R22 24.9Ω R21 24.9Ω C2 10µF AVDD 2 1 R43 SHORT (PC TRACE) R20 10kΩ 5% R19 10kΩ 5% C53 1000pF C1 1µF C36 OPEN C35 22pF NOTES: 1. ALL RESISTORS ARE 1% UNLESS OTHERWISE SPECIFIED. C8 1000pF C6 1000pF C37 OPEN C34 1000pF C32 1000pF 12 11 10 9 8 7 6 5 4 3 2 1 13 L2 AVDD L3 AVDD C10 0.1µF 14 C9 1000pF AGND AGND AVDD AVDD AGND AGND INN INP AGND AGND AVDD AVDD AVDD AVDD AGND AGND 47 48 C30 1000pF C29 0.1µF AVDD CLK C43 22pF 1 R23 49.9Ω 2 C42 1000pF T2 6 R27 24.9Ω C47 0.22µF C14 0.1µF 3 AVDD 19 20 C45 C13 22pF 1000pF AGND 5 4 18 U1 REFIN 43 C22 1000pF C21 0.22µF REFIN MAX1420 C24 1000pF REFP 44 C48 0.22µF CLK 17 C44 22pF R26 24.9Ω R25 10kΩ 5% R24 10kΩ 5% C12 0.22µF C46 0.1µF 16 C11 1000pF AVDD 15 C26 1000pF REFN 45 AGND C28 1000pF C23 0.22µF REFPT R5 49.9Ω C25 0.22µF REFNT R4 49.9Ω C27 0.22µF CML 46 R3 49.9Ω CMLT J3 CLKIN C16 0.1µF 22 3 1 2 DVDD PD 40 JU1 DGND AGND 41 C15 1000pF DVDD 21 DVDD AVDD 42 C20 1000pF C19 0.1µF AVDD D1 DVDD CLKIN B–DGND 25 26 27 28 30 31 32 33 34 35 C3 1µF C17 1000pF R7 100Ω C58 1µF 24 D2 D3 D4 D5 DGND DGND DVDD DVDD D6 D7 D8 36 R6 100Ω C4 10µF C59 OPEN D0 23 38 37 JU2 OE D11 D10 D9 39 3 1 2 DGND DVDD1 C51 1000pF R17 100Ω R16 100Ω R15 100Ω R14 100Ω R13 100Ω R12 100Ω C18 0.1µF R11 100Ω R10 100Ω R9 100Ω R8 100Ω L1 C60 OPEN C54 1µF C52 1µF DVD R1 10Ω 5% 3OE 3A3 3A4 4A1 4A2 47 46 44 43 41 40 38 1A1 1A3 1A3 1A4 2A1 2A2 2A3 28 GND 34 GND 39 GND 35 3A2 36 3A1 37 2A4 45 GND 46 2OE 25 33 32 30 29 4A3 26 4A4 27 DVD 16 17 19 20 22 GND 1OE GND GND GND 4OE 1Y1 1Y2 1Y3 1Y4 2Y1 2Y2 1 4 21 10 24 15 2 3 5 6 8 9 14 3Y2 13 3Y1 12 2Y4 11 2Y3 3Y3 3Y4 4Y1 4Y2 4Y3 7 VCC 18 VCC 42 VCC 31 VCC 23 4Y4 J1–26 C50 0.1µF J1–1 J1–3 J1–5 J1–7 J1–9 J1–11 J1–13 B–DGND J1–2 J1–4 J1–6 J1–8 J1–10 J1–12 J1–14 J1–16 J1–18 J1–20 J1–22 J1–15 J1–24 J1–17 J1–19 J1–21 J1–23 J1–25 C49 2200pF B–DGND R40 49.9Ω R39 49.9Ω R38 49.9Ω R37 49.9Ω R36 49.9Ω R35 49.9Ω R34 49.9Ω R33 49.9Ω R32 49.9Ω R31 49.9Ω R30 49.9Ω R29 49.9Ω R28 49.9Ω DVD B–DGND JU3 U2 74ALVCH16244A C55 R2 OPEN 10Ω 5% B–DGND R42 620Ω R41 820Ω B–DGND DVDD B–DGND C56 0.22µF C57 OPEN Evaluates: MAX1420/MAX1421/MAX1422 MAX1420 Evaluation Kit Figure 1. MAX1420 EV Kit Schematic 4_______________________________________________________________________________________________________ _______________________________________________________________________________________ 4 MAX1420 Evaluation Kit Figure 3. MAX1420 EV Kit PC Board Layout—Component Side Figure 4. MAX1420 EV Kit PC Board Layout—Solder Side Figure 5. MAX1420 EV Kit Component Placement Guide— Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX1420/MAX1421/MAX1422 Figure 2. MAX1420 EV Kit Component Placement Guide— Component Side Evaluates: MAX1420/MAX1421/MAX1422 MAX1420 Evaluation Kit Figure 6. MAX1420 EV Kit PC Board Layout—Inner GND Layer Figure 7. MAX1420 EV Kit PC Board Layout—Inner VCC Layer 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 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.