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| 19-2960; Rev 1; 5/05 MAX1473 Evaluation Kit General Description The MAX1473 evaluation kit (EV kit) allows for a detailed evaluation of the MAX1473 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 MAX1473 EV kit comes in two versions: a 315MHz version and a 433.92MHz version. 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 5kbps data rate received can be adjusted from 0 to 100kbps by changing two more components. For easy implementation into the customer's design, the MAX1473 EV kit also features a proven PC board layout, which can be easily duplicated for quicker time-tomarket. The EV kit Gerber files are available for download at www.maxim-ic.com. 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 Addition of an Antenna *Requires component changes Features Evaluates: MAX1473 Ordering Information PART MAX1473EVKIT-315 MAX1473EVKIT-433 TEMP RANGE -40C to +85C -40C to +85C IC PACKAGE 28 TSSOP 28 TSSOP Component List DESIGNATION QTY C1, C2 2 DESCRIPTION 0.01F 10% ceramic capacitors (0603) Murata GRM188R71H103KA01 1500pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H152KA01 0.47F +80% - 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 4pF 0.1pF ceramic capacitor (0603) Murata GRM1885C1H4R0BZ01 2.2pF 0.1pF ceramic capacitor (0603) Murata GRM1885C1H2R2BD01 0.1F 5% ceramic capacitors (0603) Murata GRM188R71C104KA01 Not installed DESIGNATION QTY C14, C15 2 DESCRIPTION 15pF 5%, 50V ceramic capacitors (0603) Murata GRM1885C1H150JZ01 0.01F +80% - 20% ceramic capacitor (0603), not installed Murata GRM188R71H103KA01 0 resistor (0603) SMA connector edge mount, not installed Johnson 142-0701-801 3-pin headers Digi-Key S1012-36-ND or equivalent 2-pin header Not installed Shorted Shunts (JU1) Digi-Key S9000-ND or equivalent 27nH 5% inductor (0603) Coilcraft 0603CS-27NXJB C3 1 C17 C21 F_IN JU1, JU2, JU5, JU6 JU7 JU3, JU4 JU8 -- L1 (315MHz) 0 1 0 C4 1 C5 C6, C10 C7, C8, C11 C9 (315MHz) C9 (433MHz) C12, C20 C13, C16, C18, C19 1 2 3 1 1 2 0 4 1 0 1 5 1 ________________________________________________________________ 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. MAX1473 Evaluation Kit Evaluates: MAX1473 Component List (continued) DESIGNATION QTY L1 (433MHz) L2 (315MHz) L2 (433MHz) L3 1 1 1 1 DESCRIPTION 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 SMA connector top mount, not installed Digi-Key J500-ND Johnson 142-0701-201 5.1k resistor (0603), any Resistor (0603), not installed 270 resistor (0603), any, not installed 10k resistor (0603), any 10pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H100JZ01 10k resistor (0603), any Y1 (433MHz) 1 RF IN TP2, TP4-TP12 VDD, GND, SHDN, DATA_OUT, TP3 1 0 DESIGNATION QTY R9 1 DESCRIPTION 1000pF 10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102KA01 SMA connector top mount Digi-Key J500-ND Johnson 142-0701-201 Not installed Test points Mouser 151-203 or equivalent Crystal 4.754687MHz Hong Kong Crystal SSL4754687E03FAFZ8A0 or Crystek 016867 Crystal 6.6128MHz Hong Kong Crystal SSL6612813E03FAFZ8A0 or Crystek 016868 10.7MHz ceramic filter Murata SFTLA10M7FA00-B0 MAX1473EUI MAX1473 EV kit PC board 5 MIX OUT R1 R2, R4, R6 R3 R5 R7 R8 0 1 0 0 1 1 1 Y1 (315MHz) 1 Quick Start The following procedure allows for proper device evaluation. Y2 U1 -- 1 1 1 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 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 input amplitude of around -60dBm, this DC voltage will drop suddenly to about 1.5V and then rise 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 coupling 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. 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. 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% 2 _______________________________________________________________________________________ MAX1473 Evaluation Kit 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 -117dBm (0.2% BER) while a 433.92MHz kit displays a sensitivity of about -115dBm (0.2% BER). Note: The above sensitivity values are given in terms of average peak power is 3dB higher. 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 5kbps. Adjusting these values accommodates higher data rates (refer to the MAX1473 data sheet for more details). for continuous shutdown, or pins 1 and 2 for continuous operation. Remove the JU1 shunt for external control. Table 1 describes jumper functions. Evaluates: MAX1473 Power Supply The MAX1473 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. IF Input/Output The 10.7MHz IF can be monitored with the help of a spectrum analyzer using the MIX_OUT SMA connector (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 connector to inject an external IF as a means of evaluating the baseband data slicing section. Jumper JU3 needs to connect pins 2 and 3. 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 connector (not provided). Connect the SMA connector to a function generator. The addition of C18 and C19 is necessary (use 0.01F capacitors). 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%. 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 MAX1473. All required components have been enclosed in a 1.25in 1.25in square, which can be directly "inserted" into the application circuit. AGC Control Jumper JU5 controls whether the AGC is enabled. Connect pins 2 and 3 to enable the AGC. Crystal Select Jumper JU2 controls the crystal divide ratio. Connecting pins 1 and 2 sets the divide ratio to 64, while connecting pins 2 and 3 sets the ratio to 32. This determines the frequency of the crystal to be used. Image Rejection Frequency Select A unique feature of the MAX1473 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. 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, consult the www.maxim-ic.com website. Detailed Description Power-Down Control The MAX1473 can be controlled externally using the SHDN connector. The IC draws approximately 1.25A in shutdown mode. Jumper JU1 is used to control this mode. The shunt can be placed between pins 2 and 3 _______________________________________________________________________________________________________ 3 MAX1473 Evaluation Kit Evaluates: MAX1473 Table 1. Jumper Functions JUMPER JU1 JU1 JU1 JU2 JU2 JU3 JU3 JU3 JU4 JU4 JU5 JU5 JU6 JU6 JU6 JU7 JU7 STATE 1-2 2-3 NC 2-3 1-2 1-2 2-3 NC 1-2 2-3 1-2 2-3 1-2 2-3 NC 1-2 NC 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 Disables AGC Enables AGC IR centered at 433MHz IR centered at 315MHz IR centered at 375MHz Connect VDD to +3.3V supply Connect VDD to +5.0V supply Table 3. I/O Connectors SIGNAL RF_IN F_IN MIX_OUT GND VDD DATA_OUT SHDN RF input External reference frequency input IF input/output Ground Supply input Sliced data output External power-down control DESCRIPTION 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 Figure 1. MAX1473 EV Kit 4 _______________________________________________________________________________________ MAX1473 Evaluation Kit Evaluates: MAX1473 * C9 L1 L2 Y1 AT 315MHz 4pF 27nH 120nH 4.754689MHz AT 433.92MHz 2.2pF 15nH 56nH 6.6128MHz C18 OPEN +3.3V C12 0.1F 1 2 XTAL1 AVDD XTAL2 PWRDN PDOUT C16 OPEN C14 15pF Y1 * C15 15pF C19 OPEN F_IN +3.3V JU7 C20 0.1F VDD VDD TP10 TP5 VDD 28 27 26 R2 OPEN 3 4 L3 15nH +3.3V 7 C2 0.01F 5 6 LNAIN LNASRC AGND LNAOUT AVDD R9 1000pF 8 MIXIN1 MIXIN2 22 21 20 R1 TP3 5.1k C6 220pF DSN TP2 C4 0.47F C5 470pF JU8 SHORT R6 OPEN U1 MAX1473 DSP 23 C21 0 R7 10pF DATAOUT VDD5 25 24 VDD C13 OPEN TP4 1 2 JU4 3 JU1 DSN 1 2 3 SHDN TP9 TP8 R5 10k DATA_OUT RF_IN C7 100pF L2 * L1 * +3.3V C9 * C11 100pF C10 220pF C8 100pF 9 DFFB OPP GND TP6 DSN TP7 +3.3V 10 1 3 2 JU6 11 12 13 AGND IR_SEL MIXOUT DFO IFIN2 19 18 17 C3 1500pF R8 10k +3.3V +3.3V JU2 1 2 1 3 3 R3 JU3 OPEN 2 R4 OPEN C17 OPEN MIX_OUT +3.3V DGND 14 DV DD C1 0.01F IN 1 GND 2 IFIN1 16 XT_SEL 15 AGC_OFF Y2 OUT 10.7MHz 3 JU5 1 TP12 2 3 TP11 Figure 2. MAX1473 EV Kit Schematic _______________________________________________________________________________________ 5 MAX1473 Evaluation Kit Evaluates: MAX1473 Figure 3. MAX1473 EV Kit Component Placement Guide-- Component Side Figure 4. MAX1473 EV Kit PC Board Layout--Component Side Figure 5. MAX1473 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. |
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