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1 9-907; Rev ; /0 MAX7 Evaluation Kit General Description The MAX7 evaluation kit (EV kit) allows for a detailed evaluation of the MAX7 ASK transmitter. It enables testing of the device s RF performance and requires no additional support circuitry. The RF output uses a 50Ω matching network and an SMA connector for convenient connection to test equipment. A reversepolarity SMA is also included to connect to a / wave whip antenna. The EV kit can also directly interface to the user s embedded design for easy data encoding. The MAX7 EV kit comes in two versions: a 5MHz version and a.9mhz version. The passive components are optimized for these frequencies. These components can easily be changed to work at RF frequencies from 00MHz to 50MHz. For easy implementation into the customer s design, the MAX7 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 Features Proven PC Board Layout Proven Components Parts List Multiple Test Points Provided On-Board Available in 5MHz or.9mhz Optimized Versions Adjustable Frequency Range from 00MHz to 50MHz Fully Assembled and Tested Can Operate as a Stand-Alone Transmitter with Included Battery Requires component changes Ordering Information PART TEMP RANGE IC PACKAGE MAX7EVKIT-5-0 C to +85 C 8 SOT-8 MAX7EVKIT- -0 C to +85 C 8 SOT-8 Component List Evaluates: MAX7 Antenna (5MHz) 0 5MHz / wave whip antenna Lynx ANT-5-CW-RH, C (5MHz) pf ±5%, 50V ceramic Murata GRM885CH0J Antenna (MHz) 0 MHz / wave whip antenna Lynx ANT--CW-RH, C (MHz) pf ±5%, 50V ceramic Murata GRM885CH0J ANTENNA_OUT BAT SMA connector top mount, Digi-Key J500-ND Johnson Battery holder MPD BA0 C, C0 C 0.0µF ±0%, 50V ceramic capacitors (060) Murata GRM88R7H0KA0 680pF ±5%, 50V ceramic Murata GRM885CH68J Battery C (5MHz) C (MHz) Coin-cell battery Panasonic BR0 5pF ±5%, 50V ceramic Murata GRM885CH50J 7pF ±5%, 50V ceramic Murata GRM885CH7R0J C5, C6, C8, C9 0 Not installed C6 (5MHz) C6 (MHz) C7 5pF ±5%, 50V ceramic Murata GRM885CH50J 0pF ±5%, 50V ceramic Murata GRM885CH00J 0.7µF +80% - 0%, 6V ceramic Murata GRM88F5C7Z Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at
2 MAX7 Evaluation Kit Evaluates: MAX7 C, C C, C5 JU, JU JU JU, JU L (5MHz) L (MHz) L (5MHz) L (MHz) R 0pF ±5%, 50V ceramic capacitors (060) Murata GRM885CHJ pf ±5%, 50V ceramic capacitors (060) Murata GRM885CH0J -pin headers Digi-Key S0-6-ND or equivalent Shunts Digi-Key S9000-ND or equivalent -pin headers Digi-Key S0-6-ND or equivalent 7nH ±5% inductor (060) Coilcraft 060CS-7NXJB nh ±5% inductor (060) Coilcraft 060CS-NXJB nh ±5% inductor (060) Coilcraft 060CS-NXJB 5nH ±5% inductor (060) Coilcraft 060CS-5NXJB 5kΩ potentiometer BC Components SMW50 Component List (continued) R 0 0Ω resistor (060), any, R 5.Ω resistor (060), any R 6kΩ ±5% resistor (060), any REF_IN RFOUT SW, VSS,, DATA-IN RP-SMA connector Lynx CONREVSMA00 SMA connector top mount Digi-Key J500-ND Johnson Switch Panasonic EVQ-PJS0K U MAX7EKA U ICM7555ISA Y (5MHz) Y (MHz) Test points Mouser 5-0 or equivalent Crystal MHz Hong Kong Crystal SSL98750E0FAFZ800 or Crystek Crystal.56MHz Hong Kong Crystal SSM56000E0FAFZ800 or Crystek 0700 MAX7 EV kit PC board Component Suppliers SUPPLIER PHONE FAX Coilcraft Crystek Hong Kong Crystal Murata Quick Start The following procedure allows for proper device evaluation. Required Test Equipment Regulated power supply capable of providing +.0V Spectrum analyzer such as the Agilent 856E Optional ammeter for measuring supply current Power meter such as the Agilent EPM-A 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 until all connections are made: ) Connect a DC supply set to +.0V, through an ammeter, to the and VSS terminals on the EV kit. Do not turn on the supply. ) Connect the RF OUT SMA connector to the spectrum analyzer. Set the analyzer to a center frequency of 5MHz (or.9mhz) and a span of MHz. ) Turn on the DC supply. The spectrum analyzer should display a peak of about +0dBm at 5MHz (or.9mhz). ) Disconnect the spectrum analyzer and connect the power meter instead. Measure the output power and also the current draw.
3 MAX7 Evaluation Kit 5) Calculate the efficiency. This is done using the following equation: Efficiency = 0 ^ (Pout / 0) / (V x I) where I is in ma. For example, the efficiency is 6.6% for an output of +dbm, and a current of 9mA (at.0v). 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 λ/0 or longer can act as antennas. Keeping the traces short also reduces parasitic inductance. Generally, in of a PC board trace adds about 0nH of parasitic inductance. The parasitic inductance can have a dramatic effect on the effective inductance. For example, a 0.5in trace connecting a 00nH inductor adds an extra 0nH of inductance or 0%. 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 connections. The EV kit PC board can serve as a reference design for laying out a board using the MAX7. Detailed Description Enable Control The MAX7 can be controlled externally using the connector. The IC draws approximately na (at room temperature) in shutdown mode. Jumper JU is used to control this mode. The shunt can be placed between pins and for continuous operation. Remove the JU shunt for external control. See Table for jumper function descriptions. Table. Jumper Functions JUMPER STATE FUNCTION JU - Normal operation JU NC External power-down control JU - RF carrier-transmit mode JU - Transmit pulse-train mode JU NC External data transmit JU - External supply operation JU - Battery operation JU - Continuous data generation JU NC Data controlled by SW Data Input The MAX7 EV kit transmits ASK data with data rates up to 00kbps. JU controls whether the MAX7 transmits CW (jumper pins and connected), an external data stream (no jumper), or train pulses generated by the ICM7555 timer (jumper pins and connected). JU controls whether the ICM7555 data is being generated continuously or at the push of SW. REF_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 REF_IN SMA (not provided). Connect the SMA to a low-phase-noise generator. The addition of C8 and C9 is necessary (use 0.0µF capacitors). Battery Operation The MAX7 EV kit can be powered by an external power supply or by the supplied V coin-cell battery. Set jumper JU to connect pins and for battery operation. RF Output The MAX7 EV kit includes two SMA connectors for RF output. RFOUT is a standard SMA and is used to connect the PA output to test equipment. Output is matched to 50Ω. ANTENNA_OUT is a reverse polarity SMA and is used to connect to a / wave whip antenna. Note that resistor R (0Ω) needs to be added. Table lists all I/O connections. Table. I/O Connectors SIGNAL RFOUT REF_IN ANTENNA_OUT VSS DATA_IN RF output I/O Connections DESCRIPTION External reference frequency input Reverse polarity SMA for / wave antenna Ground.0V power input Data input External power-down control For additional information and a list of application notes, consult the Maxim website, www/maxim-ic.com. Evaluates: MAX7
4 MAX7 Evaluation Kit Evaluates: MAX7 Figure. MAX7 EV Kit 50Ω OUTPUT AT 5MHz AT.9MHz C 5pF 7pF C pf pf C6 5pF 0pF L 7nH nh L nh 5nH Y 9.875MHz.56MHz VALUES AFFECTED BY PC BOARD LAYOUT. C pf Y C6 C5 pf C9 REF_IN RFOUT C 680pF L C6 R 5kΩ R 0Ω C 0pF C C VSS C8 L ANTENNA_OUT 8 XTAL XTAL V SS PAV SS PA U MAX7 V DD DATA C5 C7 0.7µF JU R 6kΩ C 0pF SW R 5.Ω C0 0.0µF GND DATA_IN JU DISCHARGE U ICM7555 V+ OUTPUT THRESHOLD JU BAT C 0.0µF JU RESET CONTROL VOLTAGE 5 Figure. MAX7 EV Kit Circuit Diagram
5 MAX7 Evaluation Kit Evaluates: MAX7 Figure. MAX7 EV Kit Component Placement Guide Top Silkscreen Figure. MAX7 EV Kit PC Board Layout Top Copper Figure 5. MAX7 EV Kit PC Board Layout Bottom Copper 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, 0 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
*Requires component changes
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9-24; Rev 2; 2/02 EVALUATION KIT AVAILABLE 0MHz to 050MHz Integrated General Description The combines a low-noise oscillator with two output buffers in a low-cost, plastic surface-mount, ultra-small µmax
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9-887; Rev 0; 2/00 MAX669 Evaluation System General Description The MAX669 evaluation system consists of a MAX669 evaluation kit (EV kit) and a companion Maxim SMBus interface board. The MAX669 EV kit
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General Description The MAXFILTERBRD is an unpopulated PCB design to evaluate the MAX7408 MAX7415/ 5th-order, lowpass, switched-capacitor filters (SCFs). Contact the factory for free samples of the pin-compatible
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9-75; Rev ; 5/5 MAX7 Evaluation Kit General Description The MAX7 evaluation kit (EV kit) simplifies the testing and evaluation of the MAX7 quadrature transmitter. The EV kit provides 5Ω connectors for
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MAX68 Evaluation Kit Evaluates: MAX68 General Description The MAX68 evaluation kit (EV kit) demonstrates the MAX68 high-brightness LED (HB LED) driver, integrating a step-up DC-DC preregulator followed
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General Description The MAX2839 evaluation kit (EV kit) simplifies testing of the MAX2839 receive and transmit performance in WiMAX applications operating in the 2.3GHz to 2.7GHz band. The EV kit provides
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