MAX7058 Evaluation Kit Evaluates: MAX7058 General Description Features The MAX7058 evaluation kit (EV kit) provides a proven S Proven PCB Layout design to evaluate the MAX7058 dual-frequency ASK S Proven Components List transmitter in a 24-pin TQFN package with an exposed S Adjustable Programmable Frequency (315MHz pad. The EV kit enables testing of the devices RF perfor- and 390MHz) mance and requires no additional support circuitry. The RF output uses a 50I matching network and an SMA S Fully Assembled and Tested connector for convenient connection to test equipment. The EV kit comes with a MAX7058ATG+ installed on the EV board. Ordering Information PART TYPE MAX7058EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION J1 1 5-pin header 0.01FF Q10%, 50V X7R ceramic C1, C2, C3 3 capacitors (0603) JU1JU12 12 3-pin headers Murata GRM188R71H103K 18nH Q5% inductor (0603) L1 1 Murata LQW18AN18NJ00 0.1FF Q10%, 16V X7R ceramic C4, C5 2 capacitors (0603) 22nH Q5% inductor (0603) L2 1 Murata GRM188R71C104K Murata LQW18AN22NJ00 R1 1 0W Q5% resistor 680pF Q5%, 50V C0G ceramic C6 1 capacitor (0603) Not installed, SMA female verti- REFIN 0 Murata GRM1885C1H681J cal mount RFOUT 1 SMA female vertical mount 220pF Q10%, 50V C0G ceramic TP1, TP3TP12 11 Black miniature test points C7, C8 2 capacitors (0603) Murata GRM1885C1H221K TP2 0 Not installed, miniature test point 100pF Q5%, 50V C0G ceramic 315MHz/390MHz dual-frequency C9, C10 2 capacitors (0603) U1 1 ASK transmitter (24 TQFN-EP*) Murata GRM1885C1H101J Maxim MAX7058ATG+ 15MHz crystal 8.2pF Q0.25pF, 50V C0G ceram- Y1 1 Crystek 017480 C11 1 ic capacitor (0603) Murata GRM1885C1H8R2C 12 Shunts PCB: MAX7058 EVALUATION 10pF Q5%, 50V C0G ceramic 1 KIT+ C12, C13 2 capacitors (0603) Murata GRM1885C1H100J *EP = Exposed pad. Not installed, ceramic capacitors C14, C15 0 (0603) For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-4831 Rev 0 10/09MAX7058 Evaluation Kit Evaluates: MAX7058 Component Suppliers SUPPLIER PHONE WEBSITE Crystek Corporation 800-237-3061 www.crystek.com Murata Electronics North America 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX7058 when contacting these component suppliers. 7) To test at a carrier frequency of 390MHz, change the Quick Start shunt on jumper JU12 to the 2-3 position (FSEL = 0). Required Equipment 8) Set the spectrum analyzer to a center frequency of MAX7058 EV kit 390MHz and a span of 1MHz. Spectrum analyzer 9) With the shunt on jumper JU2 in the 1-2 position, the 2.7V, 25mA power supply spectrum analyzer should display a peak of approxi- mately +10dBm at 390MHz. Set DIN to 0 by moving Procedure the shunt on JU2 to the 2-3 position. The spectrum The MAX7058 EV kit is fully assembled and tested. analyzer peak at 390MHz is gone and only the noise Follow the steps below to verify board operation: floor displays. Set DIN to 1 by changing the shunt on 1) Verify that all jumpers (JU1JU12) are in their default JU2 to the 1-2 position. The center frequency is again positions, as shown in Table 1. at 390MHz. 2) Connect the positive terminal of the 2.7V power sup- Additional Evaluation ply to the VDD pad and the GND terminal to the GND For efficiency measurements, apply power to the VDD pad. Do not turn on the power supply. pad with an ammeter in series. Apply 2.7V to VDD. 3) By default, the MAX7058 is set to the carrier frequen- Connect a power meter to RFOUT. Measure the output cy of 315MHz (TOGGLE = 0, FSEL = 1). power and supply current. 4) Connect the RFOUT SMA connector to the spectrum The efficiency is calculated by the following equation: analyzer. Set the analyzer to a center frequency of 315MHz and a span of 1MHz. (P /10) OUT 10 Efficiency = eq. 1 5) Add a shunt on jumper JU2 to the 1-2 position. This Ix V forces DIN to go high. 6) Turn on the power supply and observe the spectrum where I is in milliamps, V is in volts, and P is in deci- OUT analyzer. The spectrum analyzer should display a bels relative to 1mW. peak of approximately +10dBm at 315MHz. Set DIN For example, if P is equal to +10dBm, supply cur- OUT to 0 by moving the shunt on jumper JU2 to the 2-3 rent is 10mA, supply voltage is 2.7V, and the efficiency position. The spectrum analyzer peak at 315MHz is is approximately 37%. gone and only the noise floor displays. Set DIN to 1 by changing the shunt on JU2 to the 1-2 position. The center frequency is again at 315MHz. 2 Maxim Integrated