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19-1799; Rev 1; 7/01
MAX1448 Evaluation Kit
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. o Up to 80Msps Sampling Rate o Low-Voltage, Low-Power Operation o Single-Ended or Fully Differential Signal Input Configuration o Clock-Shaping Circuit o Fully Assembled and Tested
Features
Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
Ordering Information
PART MAX1448EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 32 TQFP
Component List
DESIGNATION C1, C2, C4-C8, C10,C16-C20, C22, C27 , C33-C39 QTY DESCRIPTION 0.1F, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG or equivalent 22pF, 200V ceramic capacitors (0805) Murata GRM2195C2D220JV01 2.2F,10V tantalum capacitors (A) AVX TAJA225K010 or Kemet T494A225K010AS 10F, 10V tantalum capacitors (B) AVX TAJB106M010 or Kemet T494B106K010AS Not installed (0805) 1000pF, 50V COG ceramic capacitor (0805) Murata GRM2195C1H102JA01 2 x 20-pin header 2-pin headers 3-pin headers Ferrite chip beads (1206) Fair-Rite Products Corp. 2512069007Y0 or HiQ Magnetics 436-2600 Not installed (0805) 49.9 1% resistors (0805) SINGLE, DIFF, CLOCK None None None None 3 4 1 1 1 DESIGNATION R4, R5, R38 R8, R24-R33 R9, R10, R36 R11 R12, R37 R40 R41 R34 T1 U1 U2 QTY 3 11 3 1 2 1 1 1 1 1 1 DESCRIPTION 24.9 1% resistors (0805) 100 1% resistors (0805) 2k 1% resistors (0805) 6.04k 1% resistor (0805) 4.02k 1% resistors (0805) 10k 1% resistor (0805) 3.9 5% resistor (0805) 5k potentiometer RF transformer Mini-Circuits TT1-6-KK81 MAX1448EHJ (32-pin TQFP) Dual CMOS differential line receiver (8-pin SO) Maxim MAX9113ESA Buffer/driver 3-state output (48-pin TSSOP) Texas Instruments SN74ALVCH16244DGG or Pericom PI74ALVCH16244A SMA PC-mount connectors Shunts (JU1 to JU4) MAX1448 PC board MAX1448 data sheet MAX1448 EV kit data sheet
22
C3, C9
2
C11, C21, C24, C26, C28, C29, C31, C32
8
C12-C15 C23, C30 C25 J1 JU1, JU2 JU3, JU4
4 0 1 1 2 2
U3
1
L1, L2
2
R1, R39 R2, R3, R13-R23, R35
0 14
________________________________________________________________ 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.
MAX1448 Evaluation Kit Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
Part Selection Table
PART MAX1444EHJ MAX1446EHJ MAX1448EHJ MAX1449EHJ SPEED (Msps) 40 60 80 105
3)
4) 5)
Component Suppliers
SUPPLIER AVX Fair-Rite Products Kemet Mini-Circuits Murata Pericom Taiyo Yuden Texas Instruments PHONE 843-448-9411 888-324-7748 864-963-6300 718-934-4500 770-436-1300 800-435-2336 800-348-2496 972-644-5580 FAX 843-448-1943 888-337-7483 864-963-6322 718-934-7092 770-436-3030 408-435-1100 847-925-0899 214-480-7800
6)
7) 8) 9)
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
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.
Required Equipment
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.
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
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
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MAX1448 Evaluation Kit
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.
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.
Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
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.
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 10k 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.
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).
Table 1. MAX1448 EV Kit Jumper Selection
JUMPER JU1 JU2 SHUNT STATUS CLOSED OPEN CLOSED OPEN 1 and 2 JU3, JU4 2 and 3 PIN CONNECTION PD connected to VDDUT PD connected internally to GND OE connected to VDDUT OE connected internally to GND IN+ and IN- pins connected to SMA connector DIFF IN+ pin connected to SMA connector SINGLE and IN- pin connected to COM pin EV KIT OPERATION MAX1448 is disabled (powered down) MAX1448 is enabled MAX1448 digital outputs are disabled MAX1448 digital outputs are enabled Analog input signal is coupled into the ADC as a differential input Analog input signal is coupled into the ADC as a single-ended input
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3
Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
L2 OVDD C39 0.1F C20 0.1F C21 2.2F 10V L1 VD U3 SN74ALVCH16244 25 R33, 100 26 4A4 4Y4 4Y3 J1-3 R21, 49.9 R20, 49.9 C36 0.1F R19, 49.9 R18, 49.9 J1-9 J1-11 R17, 49.9 R16, 49.9 R15, 49.9 R14, 49.9 11 2Y3 GND 2Y2 2A2 2A1 42 C35 0.1F 43 44 45 46 47 8 7 6 5 R8, 100 C30 OPEN VCC 1A4 1A3 GND 1A2 1A1 48 2DE 2Y1 VCC 1Y4 1Y3 GND 1Y2 1Y1 1DE 10 9 8 41 VDDUT C11 2.2F 10V C38 0.1F C25 1000pF U2 MAX9113 1 RIN1RIN2RIN1+ RIN2+ GND ROUT2 ROUT1 VCC R11 6.04k 4 2 R12 4.02k 3 C33 0.1F 7 6 5 4 3 2 1 R13, 49.9 J1-21 C37 0.1F J1-13 J1-15 J1-17 J1-19 J1-5 J1-7 GND 4Y2 4Y1 VCC 3Y4 3Y3 GND 3Y2 3Y1 2Y4 12 13 14 15 16 17 18 19 20 21 22 R22, 49.9 J1-1 4A3 GND 4A2 4A1 VCC 3A4 3A3 GND 3A2 3A1 2A4 2A3 GND 27 28 R31, 100 29 30 31 32 33 34 R27, 100 35 36 37 38 39 40 C3 22pF JU1 JU2 R26, 100 R25, 100 R24, 100 24 R30, 100 23 22 R29, 100 OVDD R28, 100 21 20 19 18 17 C34 0.1F 23 R23, 49.9 J1-2 J1-4 J1-6 J1-8 J1-10 J1-12 J1-14 J1-16 J1-18 J1-20 J1-22 J1-23 J1-24 J1-25 J1-26 J1-27 J1-28 J1-29 J1-30 J1-31 J1-32 J1-33 J1-34 J1-35 J1-36 J1-37 J1-38 J1-39 J1-40 R32, 100
32 31 30 29 28 27 26 25
D0
D1
D2
REFIN
DIFF COM OGND T.P. VDD GND OVDD D5 D6 D7
VDD VDD GND CLK
C2 0.1F TP3 2 3 C6 0.1F 4 5 GND C27 0.1F IN+ INGND
PD GND OE 9 10 11 12 13 14 15 16 D9
C26 2.2F 10V C5 0.1F REFN D4 1
REFP
GND
1 C10 0.1F VADUT 6 7 8 D8 C9 22pF C28 2.2F 10V 3 JU3 2 1 3 JU4 2 R4 24.9 1 R38 24.9 C29 2.2F 10V
T1
6
R3 49.9
2
5
3
4
MAX1448
MAX1448 Evaluation Kit
R5 24.9
VA
R37 4.02k C32 2.2F 10V
TP4
R34 3 5k 2 1
TP5 R36 2k
C22 0.1F
CLOCK
C4 0.1F
R35 49.9
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VDDUT REFIN C23 OPEN R39 OPEN C8 0.1F 3DE 4DE 24 C31 2.2F 10V R40 10k TP1 R9 2k C7 0.1F
REFOUT D3
Figure 1. MAX1448 EV Kit Schematic
R10 2k TP2 C24 2.2F 10V
4
U1
VDIN1 VD C19 0.1F C18 0.1F VDDUT VA R41 3.9 VADUT VDIN1 C17 0.1F DGND C16 0.1F VDIN2 C14 DGND 10F 10V C13 VDIN2 10F 10V C12 10F 10V C15 10F 10V
SINGLE
C1 0.1F
R2 49.9
R1 OPEN
NOTE: ALL RESISTORS ARE 0805 1% UNLESS OTHERWISE NOTED.
MAX1448 Evaluation Kit
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, 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.
Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
1.0"
1.0"
Figure 2. MAX1448EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1448EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 4. MAX1448EV Kit PC Board Layout--Solder Side
Figure 5. MAX1448EV Kit Component Placement Guide-- Solder Side 5
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MAX1448 Evaluation Kit Evaluates: MAX1444/MAX1446/MAX1448/MAX1449
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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