19-4008; Rev 0; 2/06 MAX2335 Evaluation Kit The MAX2335 evaluation kit (EV kit) simplifies evaluation of the MAX2335 450MHz, CDMA/OFDM LNA/mixer. This kit allows evaluation of the device’s low-noise amplifier (LNA), downconverter, and buffer. Figure 1 shows the MAX2335 EV kit schematic. The EV kit provides 50Ω SMA connectors for all RF and IF input and output signals. Features ♦ Easy Evaluation of the MAX2335 ♦ +2.9V to +3.3V Single-Supply Operation ♦ All Critical Matching Components Included ♦ CDMA-Band RF Ports Matched to 450MHz ♦ SMA Connectors for All RF and IF Signal Ports ♦ Easy Configuration of Operating Modes Ordering Information PART TEMP RANGE MAX2335EVKIT -40°C to +85°C *EP = Exposed paddle. IC PACKAGE 28 Thin QFN-EP* Component List DESIGNATION QTY C1, C9 2 C2, C22, C24, C27 4 DESCRIPTION DESIGNATION QTY DESCRIPTION 0.01µF ±10% capacitors GRM155R71C103K L5 1 22nH ±5% inductor (0402) TOKO LL1608-FH22NJ 100pF ±5% capacitors TDK C1005C0G1H101J L6 1 47nH ±5% inductor (0603) Coilcraft CS-47NXJBC L7, L8 2 270nH ±5% inductors (0805) TOKO LL2012-FHLR27J L9 1 1nH ±5% inductor (0402) Coilcraft CS-1N0XJBW L13 1 47nH ±2% inductor (0402) Coilcraft CS-47NXGBW LNAOUT, IFOUT, LNAIN, LOIN 4 SMA connectors Johnson 142-0701-801 C3–C6, C8, C10, C12, C14, C17, C21, C30, C31, C33 0 C7 1 3.9pF ±5% capacitor EMK105SJ3R9JW-B C11, C18, C19, C20, C26, C28 6 1000pF ±10% capacitors TDK C1005X7R1H102K C16 1 6800pF capacitor TDK C1005X7R1E682K MIXIN, LOOUT 2 SMA connectors Johnson 142-0701-201 C23, C25 2 6.8pF ±5% capacitors EMK105RH6R8JW-B R1, R4, R5, R6, R8 5 1kΩ ±5% resistors (0402) C29 1 22µF ±5% capacitor TAJC226K010 R2, R9, R12, R13 4 Open J1–J5 5 Open R3 1 18.2kΩ ±1% resistor (0402) 5 1 x 3 headers Sullins PTC36SAAN R7 1 1kΩ ±1% resistor (0402) R10 1 24.3kΩ ±1% resistor (0603) 9 Shunts Sullins STC02SYAN R11, R16, L2 3 0Ω ±5% resistors (0402) R14 1 20Ω ±1% resistor (0402) JU2, JU6, JU8, JU10 4 1 x 2 headers Sullins PTC36SAAN R15 1 475Ω ±1% resistor (0603) 1 1 18nH ±5% inductor (0402) TOKO LL1608-FH18NJ T1 L1 Balun transformer TOKO B5F 458DB-1011 U1 1 MAX2335ETI 28-pin TQFN-EP L3, L10, L11, L12 4 Open VCC, GND 2 Test points Digi-Key 5000K-ND JU1, JU3, JU4, JU5, JU7 JU1–JU8, JU10 Open ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX2335 General Description Evaluates: MAX2335 MAX2335 Evaluation Kit Component Suppliers PHONE FAX AVX SUPPLIER 803-946-0690 803-626-2123 www.avx-corp.com EF Johnson 402-474-4800 402-474-4858 www.efjohnson.com Kamaya 219-489-1533 219-489-2261 www.kamaya.com Murata 949-852-2001 949-852-2002 www.murata.com TOKO 708-297-0070 708-699-1194 Note: Indicate that you are using the MAX2335 when contacting these suppliers. Recommended Test Equipment • Power supply capable of providing 100mA at +2.9V to+3.3V • Two RF signal generators capable of delivering -70dBm to -10dBm of output power from 450MHz to 1200MHz (HP 8658C or equivalent) • Network analyzer covering the MAX2335 operating frequency range (HP 8753 or equivalent) • Spectrum analyzer covering the MAX2335 operating frequency range (HP 8561E or equivalent) • Ammeter (optional) for measuring supply current • Noise figure meter (optional) for measuring the noise figure of the LNA and downconverters (HP 8970B or equivalent) Quick Start The MAX2335 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. Connections and Setup This section provides a step-by-step guide to setting up the MAX2335 EV kit and testing the LNA and downconverters. Do not turn on the DC power or RF signal generators until all connections are made. Low-Noise Amplifier, High-Gain High-Linearity Mode 1) Set Mode 0 (JU1), Mode 1 (JU3), and Mode 2 (JU4) on the EV kit to VCC (high). This enables the LNA to operate in the high-gain and high-linearity mode. 2) Connect a DC supply preset to +3V (through an ammeter, if desired) to the EV kit’s VCC and GND terminals. Do not turn on the supply. 3) Perform a full two-port calibration on a network analyzer at a -30dBm power level over a 400MHz to 500MHz frequency range. 2 WEBSITE www.toko.com 4) Connect port 1 and port 2 of the network analyzer to LNAIN and LNAOUT, respectively, to measure the gain at 465MHz. 5) The network-analyzer display should indicate a typical gain of 16dB at 465MHz after accounting for board losses. The input and output board losses are 0.3dB at the 465MHz band. These losses are to be added to the measurements to obtain the performance of the LNA. Downconverter, High-Gain High-Linearity Mode 1) Turn off the DC supply. 2) Remove the network analyzer from the LNA input and output connections. The DC supply connections for testing the downconverter mixer are the same as the LNA section. 3) Set the LO/2 jumper (JU5) to VCC to enable the LO divider circuit. 4) The mode setting for testing the downconverter mixer is the same as the LNA section. 5) Connect an RF signal generator (with output disabled) to the LOIN connector. Set the frequency to 1150MHz and the output power to -7dBm. 6) Connect another RF signal generator (with output disabled) to the MIXIN SMA connector. Set the frequency to 465MHz and the output power to -40dBm. 7) Connect the spectrum analyzer to the IFOUT SMA connector. Set the spectrum-analyzer center frequency to 110MHz. 8) Turn on the DC supply. Enable the LO signal generator and RF input signal generator outputs. 9) Measure the peak of the 110MHz IF signal on the spectrum analyzer. Compensate the IF signal conversion gain of the balun and the board losses. The balun loss is approximately 0.3dB and the input and output board losses are 0.1dB each. 10) The conversation gain is approximately 13dB after corrections from step 9 are applied. _______________________________________________________________________________________ MAX2335 Evaluation Kit PC Board Layout Considerations The MAX2335 EV kit can serve as a board layout guide. Keep PC board trace lengths as short as possible to minimize parasitics. Keep decoupling capacitors close to the device, with a low-inductance connection to the ground plane. VCC JU10 C2 100pF C1 0.01µF L1 18nH C7 3.9pF LNAOUT 2 C16 6800pF L5 22nH LNAIN VCC VCC C17 OPEN JU1 R1 1kΩ VCC JU3 JU4 27 26 LNAOUT N.C. 1 DEGEN R10 24.3kΩ R16 0Ω C8 OPEN R15 475Ω L3 OPEN J5 OPEN C5 OPEN C6 OPEN J4 OPEN L12 OPEN C9 0.01µF MIXIN 28 L9 1nH C14 OPEN L2 0Ω L6 47nH R2 OPEN J1 OPEN JU2 C4 OPEN C3 OPEN VCC R14 20Ω R4 1kΩ R5 1kΩ VCC 25 VCC 24 N.C. N.C. 23 22 I.C. MIXIN 21 RBIAS 20 RLNA IF_CDMA+ GND U1 IF_CDMA- 19 4 LNAIN MAX2335 3 5 MODE0 C11 1000pF 6 MODE1 C18 1000pF 7 MODE2 C19 N.C. 1000pF 8 VCC R6 1kΩ JU5 C20 1000pF LOIN LO_IN 10 C22 100pF C21 OPEN VCC JU6 R7 1kΩ 16 C24 100pF L7 270nH L8 270nH C25 6.8pF 3 2 1 4 IFOUT 6 T1 BALUN TOKO 85F 45808-1011 VCC JU7 C26 1000pF C27 100pF L10 OPEN C23 6.8pF R8 1kΩ VCC 15 I.C. LO_OUT N.C. L11 12 13 14 OPEN VCC JU8 R12 R13 OPEN OPEN N.C. 11 R9 OPEN J2 OPEN C10 OPEN N.C. 18 BUFFEN 17 LO/2 9 R3 18.2kΩ VCC C28 1000pF R11 0Ω VCC GND C29 22µF C31 OPEN C30 C12 OPEN OPEN J3 OPEN C33 OPEN L13 47nH LOOUT Figure 1. MAX2335 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX2335 Checking Noise Figure Noise figure measurements are sensitive to board and lab setup losses and parasitics. There are many techniques and precautions for measuring a low noise figure. Detailed explanation of these items goes beyond the scope of this document. For more information on how to perform this level of noise figure measurement, refer to the noise figure meter operating manual, as well as to the Hewlett Packard Application Note #57-2, Noise Figure Measurement Accuracy. Evaluates: MAX2335 MAX2335 Evaluation Kit Figure 2. MAX2335 EV Kit PC Board Layout—Front Side 4 _______________________________________________________________________________________ MAX2335 Evaluation Kit Evaluates: MAX2335 Figure 3. MAX2335 EV Kit PC Board Layout—Ground Layer 2 _______________________________________________________________________________________ 5 Evaluates: MAX2335 MAX2335 Evaluation Kit Figure 4. MAX2335 EV Kit PC Board Layout—Ground Layer 3 6 _______________________________________________________________________________________ MAX2335 Evaluation Kit Evaluates: MAX2335 Figure 5. MAX2335 EV Kit PC Board Layout—Back Side _______________________________________________________________________________________ 7 Evaluates: MAX2335 MAX2335 Evaluation Kit Figure 6. MAX2335 EV Kit Component Placement Guide—Top Silk 8 _______________________________________________________________________________________ MAX2335 Evaluation Kit Evaluates: MAX2335 Figure 7. MAX2335 EV Kit Component Placement Guide—Bottom Silk 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 _____________________ 9 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.