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19-3917; Rev 0; 12/05
MAX7033 Evaluation Kit
General Description
The MAX7033 evaluation kit (EV kit) allows for a detailed evaluation of the MAX7033 superheterodyne receiver. It enables testing of the device's RF performance and requires no additional support circuitry. The RF input uses a 50 matching network and an SMA connector for convenient connection to test equipment. The EV kit can also directly interface to the user's embedded design for easy data decoding. The MAX7033 EV kit comes in two versions: 315MHz and 433.92MHz. The passive components are optimized for these frequencies. These components can easily be changed to work at RF frequencies from 300MHz to 450MHz. In addition, the received data rate can be adjusted from 0 to 66kbps by changing three more components. For easy implementation into the customer's design, the MAX7033 EV kit also features a proven PC board layout, which can be easily duplicated for quicker time to market. The EV kit Gerber files are available for download at www.maxim-ic.com.
Features
Proven PC Board Layout Proven Components Parts List Multiple Test Points Provided On Board Available in 315MHz or 433.92MHz Optimized Versions Adjustable Frequency Range from 300MHz to 450MHz* Fully Assembled and Tested Can Operate as a Stand-Alone Receiver with the Addition of an Antenna
*Requires component changes.
Evaluates: MAX7033
Ordering Information
PART MAX7033EVKIT-315 MAX7033EVKIT-433 TEMP RANGE -40C to +85C -40C to +85C IC PACKAGE 28 TSSOP 28 TSSOP
Component List
DESIGNATION C1, C2, C23 QTY 2 DESCRIPTION 0.01F 10% ceramic capacitors (0603) Murata GRM188R71H103KA01 1500pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H152KA01 0.47F 80% to 20% ceramic capacitor (0603) Murata GRM188F51C474ZA01 470pF 5% ceramic capacitor (0603) Murata GRM1885C1H471JA01 220pF 5% ceramic capacitors (0603) Murata GRM1885C1H221JA01 100pF 5% ceramic capacitors (0603) Murata GRM1885C1H101JA01 4.0pF 0.1pF ceramic capacitor (0603) Murata GRM1885C1H4R0BZ01 2.2pF 0.1pF ceramic capacitor (0603) Murata GRM1885C1H2R2BD01 DESIGNATION C12, C20, C24 C13, C16, C18, C19 C14, C15 QTY 2 DESCRIPTION 0.1F 5% ceramic capacitors (0603) Murata GRM188R71C104KA01 Not installed 15pF 5%, 50V ceramic capacitors (0603) Murata GRM1885C1H150JZ01 Not installed, 0.01F 80% to 20% ceramic capacitor (0603) Murata GRM188R71H103KA01 10pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H100JZ01 1000pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102KA01 Not installed, SMA connector, edge mount Johnson 142-0701-801 3-pin headers Digi-Key S1012-36-ND or equivalent
C3
1
0
2
C4
1
C17
0
C5
1
C6, C10
2
C21
1
C7, C8, C11
3
C22
1
C9 (315MHz) C9 (433MHz)
1
F_IN
0
1
JU1, JU2, JU5, JU6
4
________________________________________________________________ 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.
MAX7033 Evaluation Kit Evaluates: MAX7033
Component List (continued)
DESIGNATION JU3, JU4 JU7 JU8 L1 (315MHz) L1 (433MHz) L2 (315MHz) L2 (433MHz) L3 QTY 0 1 1 1 1 1 1 1 DESCRIPTION Not installed 2-pin header Shorted 27nH 5% inductor (0603) Coilcraft 0603CS-27NXJB 15nH 5% inductor (0603) Coilcraft 0603CS-15NXJB 120nH 5% inductor (0603) Coilcraft 0603CS-R12XJB 56nH 5% inductor (0603) Coilcraft 0603CS-56NXJB 15nH 5% inductor (0603) Murata LQG18HN15NJ00 Not installed, SMA connector, top mount Digi-Key J500-ND Johnson 142-0701-201 5.1k resistor (0603), any Not installed, resistors (0603) Not installed, 270 resistor (0603) any 10k resistor (0603), any Y1 (433MHz) 1 RF_IN TP2, TP4-TP12 VDD, GND, SHDN, AGC_C, DATA_OUT, TP3 Y1 (315MHz) 1 0 6 DESIGNATION R7 R8 QTY 1 1 DESCRIPTION 0 resistor (0603) 10k resistor (0603), any SMA connector, top mount Digi-Key J500-ND Johnson 142-0701-201 Not installed Test points Mouser 151-203 or equivalent 4.754687MHz crystal Hong Kong Crystals SSL4754687E03FAFZ8A0 or Crystek 016867 6.6128MHz crystal Hong Kong Crystals SSL6612813E03FAFZ8A0 or Crystek 016868 10.7MHz ceramic filter Murata SFTLA10M7FA00-B0 MAX7033EUI MAX7033 EV kit PC board Shunts (JU1) Digi-Key S9000-ND or equivalent
1
MIX_OUT
0
R1 R2, R4, R6 R3 R5
1 0 0 1
Y2 U1 -- --
1 1 1 5
Quick Start
The following procedures allow for proper device evaluation.
Required Test Equipment
* * Regulated power supply capable of providing +3.3V RF signal generator capable of delivering from -120dBm to 0dBm of output power at the operating frequency, in addition to AM or pulse-modulation capabilities (Agilent E4420B or equivalent) Optional ammeter for measuring supply current Oscilloscope
2) Connect the RF signal generator to the RF_IN SMA connector. Do not turn on the generator output. Set the generator for an output frequency of 315MHz (or 433.92MHz) at a power level of -100dBm. Set the modulation of the generator to provide a 2kHz, 100%, AM-modulated square wave (or a 2kHz pulse-modulated signal). 3) Connect the oscilloscope to test point TP3. 4) Turn on the DC supply. The supply current should read approximately 5mA. 5) Activate the RF generator's output without modulation. The scope should display a DC voltage that varies from approximately 1.2V to 2.0V as the RF generator amplitude is changed from -115dBm to 0dBm. (Note: At an amplitude of around -60dBm, this DC voltage drops suddenly to approximately 1.5V and then starts rising again with increasing input amplitude. This is normal; the AGC is turning on the LNA gain-reduction resistor.) 6) Set the RF generator to -100dBm. Activate the RF generator's modulation and set the scope's cou-
* *
Connections and Setup
This section provides a step-by-step guide to operating the EV kit and testing the device's functionality. Do not turn on the DC power or RF signal generator until all connections are made: 1) Connect a DC supply set to +3.3V (through an ammeter if desired) to the VDD and GND terminals on the EV kit. Do not turn on the supply.
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MAX7033 Evaluation Kit
Component Suppliers
SUPPLIER Coilcraft Crystek Hong Kong Crystal Murata PHONE 800-322-2645 800-237-3061 852-2412 0121 800-831-9172 FAX 847-639-1469 941-561-1025 852-2498 5908 814-238-0490
Evaluates: MAX7033
Note: Indicate that you are using the MAX7033 when contacting these component suppliers.
To reduce the parasitic inductance, use wider traces and a solid ground or power plane below the signal traces. Also, use low-inductance connections to ground on all GND pins, and place decoupling capacitors close to all VDD connections. The EV kit PC board can serve as a reference design for laying out a board using the MAX7033. All required components have been enclosed in 1.25in x 1.25in2, which can be directly "inserted" in the application circuit.
Detailed Description
Power-Down Control
The MAX7033 can be controlled externally using the SHDN connector. The IC draws approximately 2.5A in shutdown mode. Jumper JU1 is used to control this mode. The shunt can be placed between pins 2 and 3 for continuous shutdown, or pins 1 and 2 for continuous operation. Remove JU1 shunt for external control. See Table 1 for the jumper function descriptions.
pling to AC. The scope now displays a lowpass-filtered square wave at TP3 (filtered analog baseband data). Use the RF generator's LF OUTPUT (modulation output) to trigger the oscilloscope. 7) Monitor the DATA_OUT terminal and verify the presence of a 2kHz square wave.
Additional Evaluation
1) With the modulation still set to AM, observe the effect of reducing the RF generator's amplitude on the DATA_OUT terminal output. The error in this sliced digital signal increases with reduced RF signal level. The sensitivity is usually defined as the point at which the error in interpreting the data (by the following embedded circuitry) increases beyond a set limit (BER test). 2) With the above settings, a 315MHz-tuned EV kit should display a sensitivity of about -114dBm (0.2% BER) while a 433.92MHz kit displays a sensitivity of about -112dBm (0.2% BER). Note: The above sensitivity values are given in terms of average. 3) Capacitors C5 and C6 are used to set the corner frequency of the 2nd-order lowpass Sallen-Key data filter. The current values were selected for bit rates up to 3kbps. Adjusting these values accommodates higher data rates (refer to the MAX7033 data sheet for more details).
Table 1. Jumper Function
JUMPER JU1 STATE 1-2 2-3 N.C. JU2 1-2 2-3 1-2 JU3 2-3 N.C. JU4 1-2 2-3 1-2 JU5 2-3 N.C. 1-2 JU6 2-3 N.C. JU7 1-2 N.C. FUNCTION Normal operation Power-down mode External power-down control Crystal divide ratio = 32 Crystal divide ratio = 64 Mixer output to MIX_OUT External IF input Normal operation Uses PDOUT for faster receiver startup GND connection for peak detector filter Disable AGC Enable AGC External control of AGC lock function IR centered at 433MHz IR centered at 315MHz IR centered at 375MHz Connect VDD to +3.3V supply Connect VDD to +5.0V supply
Layout Issues
A properly designed PC board is an essential part of any RF/microwave circuit. On high-frequency inputs and outputs, use controlled-impedance lines and keep them as short as possible to minimize losses and radiation. At high frequencies, trace lengths that are on the order of /10 or longer can act as antennas. Keeping the traces short also reduces parasitic inductance. Generally, 1in of a PC board trace adds about 20nH of parasitic inductance. The parasitic inductance can have a dramatic effect on the effective inductance. For example, a 0.5in trace connecting a 100nH inductor adds an extra 10nH of inductance or 10%.
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MAX7033 Evaluation Kit Evaluates: MAX7033
Power Supply
The MAX7033 can operate from 3.3V or 5V supplies. For 5V operation, remove JU7 before connecting the supply to VDD. For 3.3V operation, connect JU7.
Test Points and I/O Connections
Additional test points and I/O connectors are provided to monitor the various baseband signals and for external connections. See Tables 2 and 3 for a description. For additional information and a list of application notes, visit www.maxim-ic.com.
IF Input/Output
The 10.7MHz IF can be monitored with the help of a spectrum analyzer using the MIX_OUT SMA (not provided). Remove the ceramic filter for such a measurement and include R3 (270) and C17 (0.01F) to match the 330 mixer output with the 50 spectrum analyzer. Jumper JU3 needs to connect pins 1 and 2. It is also possible to use the MIX_OUT SMA to inject an external IF as a means of evaluating the baseband data slicing section. Jumper JU3 needs to connect pins 2 and 3.
Table 2. Test Points
TP 2 3 4 5 6 7 8 9 10 11 12 Data filter output Peak detector out +3.3V GND Data filter feedback node Data out Power-down select input VDD AGC control Crystal select DESCRIPTION Data slicer negative input
F_IN External Frequency Input
For applications where the correct frequency crystal is not available, it is possible to directly inject an external frequency through the F_IN SMA (not provided). Connect the SMA to a function generator. The addition of C18 and C19 is necessary (use 0.01F capacitors).
AGC Control
Jumper JU5 controls whether the AGC is enabled. Connect pins 2 and 3 to enable the AGC. In addition, by removing the jumper, the AGC setting can be locked or unlocked by transitioning the AC pin while the SHDN pin is high.
Table 3. I/O Connectors
SIGNAL RF_IN F_IN MIX_OUT GND VDD DATA_OUT SHDN AGC_C RF input External reference frequency input IF input/output Ground Supply input Sliced data output External power-down control AGC control DESCRIPTION
Crystal Select
Jumper JU2 controls the crystal-divide ratio. Connecting pins 1 and 2 sets the divide ratio to 32, while connecting pins 2 and 3 sets the ratio to 64. This determines the frequency of the crystal to be used.
Image-Rejection Frequency Select
A unique feature of the MAX7033 is its ability to vary at which frequency the image rejection is optimized. JU6 allows the selection of three possible frequencies: 315MHz, 375MHz, and 433.92MHz. See Table 1 for settings.
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C14 15pF F_IN C16 OPEN
* C9 L1 L2 Y1 Y1 * C15 15pF C19 OPEN
AT 315MHz 4pF 27nH 120nH 4.75687MHz
AT 433.92MHz 2.2pF 15nH 56nH 6.6128MHz
C18 OPEN 1 XTAL1 TP9 SHDN AVDD SHDN 27 26 TP4 R2 OPEN DSN 2 LNASRC AGND LNAOUT VDD AVDD VDD5 8 MIXIN1 MIXIN2 DSP C22 1000pF JU8 AGND IRSEL 21 20 C4 0.47F TP3 C6 220pF DSN DSN R1 5.1k MIXOUT DFO DGND DVDD IFIN2 18 19 R8 10k C3 1500pF TP2 DFFB 22 TP7 C5 470pF 23 R7 0 +3.3V 9 C8 100pF +3.3V 1 3 +3.3V OPP VDD JU7 VDD 2 JU6 11 10 C10 220pF C23 0.01F C24 0.1F C21 10pF 24 DATAOUT 25 R5 10k TP8 DATA_OUT 3 1 JU4 C13 OPEN 3 JU1 1 2 XTAL2 +3.3V 2 C7 100pF L2 * 3 LNAIN L3 15nH 4 5 +3.3V 6 +3.3V 7 C11 100pF C2 0.01F C9 * C12 0.1F 28 VDD
U1
PDOUT
RF_IN
Figure 1. MAX7033 EV Kit Schematic
MAX7033
L1 * R6 OPEN GND TP6 TP5 12 13 +3.3V 14 C1 0.01F C20 0.1F TP10 17 IFIN1 16 XTALSEL TP12 AC 15 +3.3V 1 TP11 3 Y2 10.7MHz IN 1 GND OUT 2 3 JU2 1 3 +3.3V 2 3 1 2 JU3 R4 OPEN 2 JU5 AGC_C R3 OPEN C17 OPEN MIX_OUT
Evaluates: MAX7033
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MAX7033 Evaluation Kit
5
MAX7033 Evaluation Kit Evaluates: MAX7033
Figure 2. MAX7033 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX7033 EV Kit PC Board Layout--Component Side
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MAX7033 Evaluation Kit Evaluates: MAX7033
Figure 4. MAX7033 EV Kit PC Board Layout--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 _____________________ 7 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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