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19-2058; Rev 0; 5/01
MAX1420 Evaluation Kit
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. o Up to 60Msps Sampling Rate o Low Voltage, Low Power Operation o Clock-Shaping Circuitry o Easy Data Capture Configuration o Fully Assembled and Tested
Features
Evaluates: MAX1420/MAX1421/MAX1422
Ordering Information
PART MAX1420EVKIT TEMP RANGE 0C to +70C IC PACKAGE 48 TQFP
Component List
DESIGNATION QTY DESCRIPTION 1.0F, 16V, X7R, 1206 ceramic capacitors Taiyo Yuden EMK316BJ105KF Murata GRM42-6X7R105K016 TDK C3216X7R1C105M 10F, 6.3V, X5R, 1206 ceramic capacitors Taiyo Yuden JMK316BJ106KL Murata GRM42-6X5R106K6.3 TDK C3216X5R0J106K 0.1F, 16V, X7R, 0603 ceramic capacitors Taiyo Yuden EMK107BJ104KA Murata GRM39X7R104K016 TDK C1608X7R1C104K DESIGNATION C36, C37, C55, C57, C59, C60 C40 C49 QTY 0 1 1 DESCRIPTION Not installed 0.01F, 50V, X7R, 0603 ceramic capacitor 2200pF, 50V, X7R, 0603 ceramic capacitor 1.0F, 10V, X7R, 0805 ceramic capacitors Taiyo Yuden LMK212BJ105KG Murata GRM40X7R105K010 TDK C2012X7R1A105K 2 13-pin header SMA connectors, vertical PCmount 3-pin headers Not installed Ferrite chip beads, 1206 Fair-Rite Products Corp. 2512069007Y0 10 5%, 1206 resistors 49.9 1%, 0603 resistors 100 1%, 0603 resistors
C1, C3, C39, C52
4
C2, C4, C38
3
C54, C58
2
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 C12, C21, C23, C25, C27, C41, C47, C48, C56 C35, C43, C44, C45
J1 J2, J3 JU1, JU2 JU3
1 2 2 0 3 2 18 12
12
18
1000pF, 50V, X7R, 0402 ceramic capacitors
L1, L2, L3 R1, R2
9
0.22F, 10V, X7R, 0603 ceramic capacitors Taiyo Yuden LMK107BJ224KA Murata GRM39X7R224K010 22pF, 50V, COG, 0402 ceramic capacitors
R3, R4, R5, R18, R23, R28-R40 R6-R17
4
________________________________________________________________ Maxim Integrated Products
1
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.
MAX1420 Evaluation Kit Evaluates: MAX1420/MAX1421/MAX1422
Component List (continued)
DESIGNATION R19, R20, R24, R25 R21, R22, R26, R27 R41 R42 R43 QTY 4 4 1 1 0 DESCRIPTION 10k 5%, 0805 resistors 24.9 1%, 0805 resistors 820 1%, 0805 resistor 620 1%, 0805 resistor Resistor not installed (short PC trace) RF transformers Mini-Circuits T1-1T-KK81 Coilcraft WB2010-1-SM MAX1420CCM, 48-pin TQFP 16-bit buffer/driver three-state output, 48-pin TSSOP IDT 74ALVC16244APA Texas Instruments SN74ALVCH16244ADGGR
Quick Start
* DC power supplies Digital (+3.3V, 100mA) Analog (+3.3V, 100mA) * Function generator with low-phase noise and lowjitter for clock input (e.g., HP 8662A or equivalent) * Function generator for analog signal input (e.g., HP 8662A or equivalent) * Logic analyzer or data-acquisition system (e.g., HP 1663EP, HP 16500C or equivalent) * Bandpass filter selected for the input frequency of interest (e.g., TTE Q56 series or equivalent) 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.
T1, T2 U1
2 1
U2
1
Component Suppliers
SUPPLIER Coilcraft Fair-Rite Products IDT Mini-Circuits Murata Taiyo Yuden TDK Texas Instruments PHONE 847-639-6400 888-324-7748 800-345-7015 718-934-4500 814-237-1431 408-573-4150 847-803-6100 972-644-5580 FAX 847-639-1469 888-337-7483 408-492-8674 718-934-7092 814-238-0490 408-573-4159 847-803-6296 214-480-7800
3) Connect the output of the analog signal function generator to the input of the bandpass filter. 4) Connect the output of the filter to the analog input SMA connector (VIN) of the MAX1420 EV kit. 5) Connect the logic analyzer to the square pin header (J1), where D11 is the MSB and D0 is the LSB. 6) Connect a +3.3V power supply to AVDD and VS+. Connect the ground terminal of this supply to AGND. 7) Connect a +3.3V power supply to DVDD1. Connect the ground terminal of this supply to DGND. 8) Turn on both power supplies. 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.
Part Selection Table
PART MAX1420CCM MAX1421CCM MAX1422CCM SPEED (Msps) 60 40 20
2
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MAX1420 Evaluation Kit
Detailed Description
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. 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).
Evaluates: MAX1420/MAX1421/MAX1422
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.
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.
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.
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
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.
Table 1. Jumper JU1 and JU2 Functions
JUMPER SHUNT LOCATION 1-2 2-3 1-2 JU2 2-3 Digital outputs D0-D11 enabled FUNCTION MAX1420 in power-down mode MAX1420 operational Digital outputs D0-D11 disabled (high impedance)
JU1
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3
Evaluates: MAX1420/MAX1421/MAX1422
DVDD CMLT REFNT L1 JU3 DVDD1 R3 49.9 R4 49.9 AVDD DGND B-DGND DVD 1 2 JU2 R6 100 26 4A4 R7 100 48 AGND 36 29 4A2 4Y3 R30 49.9 J1-21 R31 49.9 4Y1 19 J1-19 R32 49.9 3Y4 17 J1-17 16 3Y3 C60 OPEN R33 49.9 J1-26 J1-15 J1-24 J1-22 R34 49.9 B-DGND 28 R12 100 R13 100 27 38 J1-13 9 2A3 2Y2 40 R14 100 D3 26 R15 100 D2 AVDD DGND 22 14 21 C15 1000pF 15 18 AVDD CLK AGND AVDD DVDD AGND CLK D0 23 D1 24 25 R16 100 R17 100 C16 0.1F DVD R35 49.9 J1-11 8 2A2 41 2Y1 R36 49.9 J1-9 6 2A1 43 1Y4 R37 49.9 J1-7 5 1A4 44 1Y3 R38 49.9 J1-5 R39 49.9 1A3 1Y2 46 1A3 1Y1 GND 4OE DVDD C59 OPEN B-DGND AVDD R26 24.9 AVDD L3 R24 10k 5% 4 5 6 C48 0.22F R25 10k 5% C42 1000pF R27 24.9 T2 3 B-DGND 2 1 J3 CLKIN R23 49.9 R42 620 C58 1F CLKIN C51 1000pF R41 820 47 1A1 GND GND GND 1OE 3 J1-3 2 15 24 10 21 4 1 B-DGND R40 49.9 J1-1 J1-4 J1-2 J1-10 J1-8 J1-6 J1-16 J1-14 J1-12 J1-20 J1-18 22 R29 49.9 J1-23 R9 100 30 4A1 20 R10 100 32 3A4 4Y2 R11 100 33 3A3 3OE 25 DVDD AGND 32 1 AGND D8 2 AVDD AVDD 33 D7 34 AVDD C33 0.1F 4 AGND D6 5 T1 INP 5 C35 22pF R22 24.9 7 C36 OPEN 8 AGND D5 DGND INN DGND 30 C17 1000pF C18 0.1F DVDD 4 C37 OPEN 6 6 R21 24.9 C34 1000pF 3 35 C31 0.1F C32 1000pF AVDD CML REFN REFP REFIN AVDD AGND PD OE D11 D10 D9 R8 100 J1-25 47 46 45 44 43 42 41 40 39 38 37 27 4A3 R28 49.9 B-DGND C49 2200pF C50 0.1F 7 VCC 18 VCC 42 VCC 31 VCC 23 4Y4 3 3 1 2 U2 74ALVCH16244A C27 0.22F C25 0.22F C23 0.22F C21 0.22F C19 0.1F DVDD R5 49.9 AVDD C29 0.1F C4 10F C3 1F C54 1F C55 R2 OPEN 10 5% R1 10 5% REFPT REFIN C52 1F DVD
NOTES: 1. ALL RESISTORS ARE 1% UNLESS OTHERWISE SPECIFIED.
AVDD C1 1F C2 10F C30 1000pF C26 1000pF JU1 C24 1000pF C22 1000pF C20 1000pF C28 1000pF
MAX1420 Evaluation Kit
Figure 1. MAX1420 EV Kit Schematic
C56 0.22F C57 OPEN
AGND
J2
C53 1000pF
VIN
1
U1 MAX1420
31
DVDD
R18 49.9
2
3
28 GND 34 GND 39 GND 35 3A2 36 3A1 37 2A4 45 GND 46 2OE
VS+ 9 AGND D4 C6 1000pF 10 AVDD AVDD 11 C7 0.1F 12 AGND AGND 13 C9 1000pF C46 0.1F C43 22pF C47 0.22F C12 0.22F C14 0.1F 16 C11 1000pF 17 C44 22pF 19 20 C45 C13 22pF 1000pF C8 1000pF C40 0.01F C5 0.1F C41 0.22F
R19 10k 5%
14 3Y2 13 3Y1 12 2Y4 11 2Y3
C38 10F
C39 1F
R20 10k 5%
AVDD
R43 SHORT (PC TRACE)
C10 0.1F
L2
4_______________________________________________________________________________________________________ _______________________________________________________________________________________
B-DGND
4
MAX1420 Evaluation Kit Evaluates: MAX1420/MAX1421/MAX1422
Figure 2. MAX1420 EV Kit Component Placement Guide-- Component Side
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
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MAX1420 Evaluation Kit Evaluates: MAX1420/MAX1421/MAX1422
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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