19-0375; Rev 0; 5/05 MAX2370 Evaluation Kit Features The MAX2370 evaluation kit (EV kit) simplifies the testing and evaluation of the MAX2370 quadrature transmitter. The EV kit provides 50Ω SMA connectors for all RF inputs and outputs. A varactor-based tank circuit is provided for the on-chip IF voltage-controlled oscillator (VCO) and phase locked with an on-chip PLL. I/Q baseband inputs come with standard BNC connectors. ♦ 50Ω SMA Connectors on All RF Ports The EV kit allows evaluation of the MAX2370 I/Q modulator, IF VGA, RF upconverter, IF VCO, dual synthesizer, 3-wire programming interface, and power-management features. ♦ PC Control Software (Available at www.maxim-ic.com) ♦ BNC Connectors for Baseband Inputs ♦ Fully Assembled and Tested ♦ Low-Power Shutdown Mode ♦ SPITM/QSPITM/MICROWIRETM Compatible SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Ordering Information Component List DESIGNATION C1, C2, C16, C20, C39, C65, C66, C80 C3, C11, C13, C14, C26, C27, C33, C38, C40, C41, C43, C48, C52, C56, C58, C59, C60, C64, C67, C68, C82–C85 C4, C5, C42, C75, C79, C88, C91, C93, C95, C96, C97 C6 C7, C10, C18, C19, C21, C30, C31, C35, C63, C76, C78, C81 C8, C9, C15, C17, C34, C55, C57 C12 C22, C23 QTY 8 PART DESCRIPTION 100pF ±5% ceramic capacitors (0402) Murata GRM1555C1H101J MAX2370EVKIT TEMP RANGE IC PACKAGE -40°C to +85°C 48 Thin QFN-EP* *EP = Exposed paddle. Quick Start 0 Open The MAX2370 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section. Test Equipment Required 11 1 12 7 1 2 0.1µF ±10% ceramic capacitors (0402) Murata GRM155R61C104K 4.7pF ±0.1pF ceramic capacitor (0402) Murata GRM1555C1H4R7B 1000pF ±10% ceramic capacitors (0402) Murata GRM155R71H102K 0.01µF ±10% ceramic capacitors (0402) Murata GRM155R71C103K 1.2pF ±0.1pF ceramic capacitor (0402) Murata GRM1555C1H1R2B 33pF ±5% ceramic capacitors (0402) Murata GRM1555C1H330J This section lists the recommended test equipment to verify the operation of the MAX2370. It is intended as a guide only, and substitutions may be possible. • One low-noise signal generator capable of generating a 19.2MHz signal at 600mVP-P for the PLL reference frequency • One RF signal generator capable of generating signals in the 530MHz to 695MHz frequency range with a minimum output power of -15dBm for the RF local oscillator • An RF spectrum analyzer with optional digital modulation personality (Rohde and Schwarz FSEA30 or equivalent) • A power supply that can provide 250mA at +3.0V • A power supply that can provide 50mA at +5V • An additional voltage source adjustable from 0 to 2.5V for control of the VGA functions ________________________________________________________________ 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: MAX2370 General Description MAX2370 Evaluation Kit Evaluates: MAX2370 Component List (continued) DESIGNATION QTY C24, C25 2 C28 1 C29 1 C32 1 C36 1 C37 1 C44, C45, C46 3 C47, C50 2 C49 C51 C53, C54 1 1 2 DESCRIPTION 9pF ±0.1pF ceramic capacitors (0402) Murata GRM1555C1H9R0B 0.033µF ±10% ceramic capacitor (0402) Murata GRM155R71A333K 0.022µF ±10% ceramic capacitor (0402) Murata GRM155R71C223K 1.0µF ±10% ceramic capacitor (0805) Murata GRM21BR71C105K 3300pF ±10% ceramic capacitor (0402) Murata GRM155R71H332K 0.047µF ±10% ceramic capacitor (0402) Murata GRM155R71A473K 15pF ±5% ceramic capacitors (0402) Murata GRM1555C1H150J 9.1pF ±0.1pF ceramic capacitors (0402) Murata GRM1555C1H9R1B 2.7pF ±0.1pF ceramic capacitor (0402) Murata GRM1555C1H2R7B 1.5pF ±0.1pF ceramic capacitor (0402) Murata GRM1555C1H1R5B 10pF ±5% ceramic capacitors (0402) Murata GRM1555C1H100J DESIGNATION QTY C70, C71 2 C72, C73, C94 3 C74, C77, C86 3 D1, D2, D4, D5 4 D3 1 DESCRIPTION 22µF ±10% tantalum capacitors (B-case) AVX TAJB226K010 1.0µF ±10% ceramic capacitors (0603) Murata GRM188R61A105K 10µF ±20% tantalum capacitors (B-case) AVX TAJB106K010 Varactor diodes Alpha Industries SMV1763-079 LED FL1 0 Open FL2 0 Open 7 SMA connectors—edge mount Johnson 142-0701-801 J1, J16, J20, J21, J24, J25, J27 J2, J6, J22 0 J3, J7 2 JP1 1 JU1–JU4, JU6, JU7–JU10 9 JU1, JU6–JU10 6 JU11–JU16, LOCK TESTPOINT, RBIAS 8 Open BNC connectors A/D Electronics 580-002-00 2 x 10 header Sullins PTC36DAAN 1 x 2 headers Sullins PTC36SAAN Shunts Sullins STC02SYAN Test points Keystone 5000 2) Connect the INTF2300 interface cable from the INTF2300 interface board to the MAX2370 EV kit. Pin 1 of the interface cable corresponds to the red wire. Pin 1 of the connectors are designated in the silkscreen on the MAX2370 and INTF2300 boards. • I/Q arbitrary waveform generator or CDMA generator (Agilent E4433B or equivalent) • PC (486DX33 or better) with Windows® 95/98/2000/ NT 4.0 or later operating system and an available parallel port • INTF2300 interface board and cable (supplied with EV kit) 3) Connect a +3V power supply to the headers labeled VBAT and VREG. The INTF2300 board derives its power from the MAX2370 EV kit. Connections and Setup 4) Connect a +5V power supply to the header labeled +5V. This section provides step-by-step instructions for getting the EV kit up and running for evaluation of the MAX2370 in 455MHz CDMA mode. 1) Verify shunts JU1 and JU6–JU10 are in place. 5) With its output disabled, connect the low-noise signal generator to the REF port. Set its frequency to 19.2MHz and its amplitude to -10dBm. Windows is a registered trademark of Microsoft Corp. 6) With its output disabled, connect the RF signal generator to the LOL port. Set its frequency to 575MHz and its amplitude to -10dBm. 2 _______________________________________________________________________________________ MAX2370 Evaluation Kit DESIGNATION L1 L2, L3 L4, L6, L7, L11, L16 L5, L19 L9 L10 Q1, Q2 R1, R2, R7, R19, R24, R47, R52 R3 R4, R5, R29, R30 R6, R10, R11, R12, R15, R17, R20, R26, R37, R44, R46, R49, R53, R55, R58–R61, R70, R73, R76–R84 R8, R16, R28, R48, R50, R51 R9, R18 R13, R22 R14, R21, R41, R42 7 47kΩ ±5% resistors (0402) 1 51kΩ ±5% resistor (0402) DESIGNATION R23, R45 R25, R33, R34, R38, R39, R57, R62 R27, R74 R31, R32, R35, R36 R40 R43, R54, R56 R63 R64 R71 R72 4 1kΩ ±5% resistors (0402) T2, T3 2 U1 1 U2 1 U3, U4 2 U5, U8 2 V1 V2 V3 0 0 0 QTY DESCRIPTION 1 47nH ±5% inductor (0603) 2 100nH ±5% inductors (0603) 0 Open 2 1 1 220nH ±5% inductors (0603) 56nH ±5% inductor (0603) 11nH ±5% inductor (0603) npn transistors Central Semiconductor CMPT8099 2 0 Open 6 511Ω ±1% resistors (0805) 2 2 39.2Ω ±1% resistors (0805) 680Ω ±5% resistors (0805) 4 100Ω ±1% resistors (0402) 7) Enable the low-noise signal generator’s output; then enable the RF signal generator’s output. 8) Install and run Maxim’s CDMA control software for the MAX2370 evaluation kit. This software is available on the web at www.maxim-ic.com/tools/evkit. On the IC selection form, select 2363-P3. Click on the Register View button (Note: The MAX2363 Register View screen is also used to program the MAX2370.) 9) With the MAX2363-P3 control screen active, set the registers according to Table 1. Set the reference frequency in the control screen to 19.2MHz. 10) Click on the Send Data button for each of the control registers located at the right of the screen. There are eight registers that need to be downloaded to the IC. The Lock indicator on the screen should be red, indicating that the IF PLL is locked. 11) Apply 2.5V to the VGC header (JU4). QTY DESCRIPTION 2 1kΩ ±1% resistors (0805) 7 0Ω ±5% resistors (0402) 2 10kΩ ±5% resistors (0402) 4 5.1kΩ ±5% resistors (0402) 1 3 1 1 1 1 12kΩ ±5% resistor (0402) 470Ω ±5% resistors (0402) 560Ω ±5% resistor (0402) 20kΩ ±5% resistor (0402) 130kΩ ±5% resistor (0402) 2.4kΩ ±5% resistor (0402) Baluns Toko 458DB-1616 450MHz quadrature transmitter MAX2370EGM +2.8V LDO MAX8867EUK28 Dual op amps MAX412ESA +3.0V LDOs MAX8867EUK30 Open Open Open IF Modulator Evaluation 1) Connect the CDMA baseband signal generator to the I and Q ports using BNC connectors. Set the modulation to reverse-channel CDMA at an output level of 780mVP-P. The nominal input level at the I/Q input pins is 130mVRMS. Measure the differential voltage at the chip’s I/Q inputs and adjust the signal generator’s output if necessary to achieve 130mVRMS. 2) Connect IFOUT to the spectrum analyzer. Configure the spectrum analyzer to measure ACPR for reverse-channel CDMA. Set the center frequency to 120MHz with a -10dBm reference level and 30kHz resolution bandwidth. 3) Adjust the VGC voltage until the output power is -12dBm. The ACPR at ±885kHz offset will be approximately -66dBc, and the ACPR at ±1.98MHz will be approximately -84dBc. _______________________________________________________________________________________ 3 Evaluates: MAX2370 Component List (continued) Evaluates: MAX2370 MAX2370 Evaluation Kit RF Upconverter Evaluation 1) Connect a CDMA RF signal generator to the IFIN port using the SMA connector. Set the carrier frequency to 120MHz, set the output power to -16.5dBm, and set the modulation to reverse-channel CDMA. 2) Connect RFL to the spectrum analyzer. Configure the spectrum analyzer to measure ACPR for reverse-channel CDMA. Set the center frequency to 455MHz with a +10dBm reference level and 30kHz resolution bandwidth. 3) Set the VGC voltage to 2.5V and adjust the IF input power until the RF output power is +8dBm. The ACPR at ±885kHz offset will be approximately -67dBc, and the ACPR at ±1.98MHz will be approximately -86dBc. Cascaded Evaluation 1) Connect the CDMA baseband signal generator to the I and Q ports using BNC connectors. Set the modulation to reverse-channel CDMA at a 780mVP-P output level. The nominal input level at the IC’s I/Q input pins is 130mVRMS. Measure the differential voltage at the chip’s I/Q inputs and adjust the signal generator’s output if necessary to achieve 130mVRMS. 2) Connect an external 120MHz bandpass filter between the IFOUT and IFIN ports of the MAX2370 evaluation kit. A 50Ω filter with approximately 4dB of insertion loss is recommended, or an attenuator with a loss of 4dB can be used if a 120MHz filter is not available. The on-board baluns and matching networks at the IFOUT and IFIN ports each add approximately 0.5dB of loss, for a total IF loss of 5dB. 3) Connect RFL to the spectrum analyzer. Configure the spectrum analyzer to measure ACPR for reverse-channel CDMA. Set the center frequency to 455MHz with a +10dBm reference level and 30kHz resolution bandwidth. 4) Adjust the VGC voltage until the RF output power is +8dBm. The ACPR at ±885kHz offset will be approximately -64dBc, and the ACPR at ±1.98MHz will be approximately -82dBc. Adjustments and Control VGA Adjust Apply a voltage from 0.5V to 2.5V to header VGC to adjust the IF and RF VGA of the MAX2370. The VGC voltage is filtered on the EV kit to minimize undesired amplitude modulation. 4 Table 1. Register Settings REGISTER NAME TYPICAL REGISTER SETTINGS REGISTER ADDRESS RFM[17:0] 23000DEC 0000b RFR[12:0] 384DEC 0001b IFM[13:0] 4800DEC 0010b IFR[10:0] 384DEC 0011b OPCTRL[15:0] 090FHEX 0100b CONFIG[15:0] D03FHEX 0101b ICCCTRL[15:0] 0C38HEX 0110b TEST[8:0] 100HEX 0111b Interface Control The interface port is designed to use a 20-pin ribbon cable (Figure 1); 10 pins are signal lines, and the other 10 pins are digital grounds. Pin 1 of the interface cable is red. Pin 1 is also designated in the silk screen on each of the PC boards. Detailed Description The following section covers the EV kit’s circuit blocks in detail (refer to the MAX2370 data sheet for additional information). I/Q Inputs The single-ended I/Q signals are converted to differential by operational amplifiers on the EV kit. The op amps also provide DC bias to the I/Q input pins of the MAX2370. The EV kits are set up to provide 130mVRMS differential to the IC when driven with an IS-95 forwardmodulated source set to deliver 0.9VP-P into a matched 50Ω load. Programming Interface The programming interface is provided by the INTF2300 interface board. The interface board buffers and level shifts logic levels from the PC to the MAX2370 EV kit (refer to the INTF2300 documentation). These logic signals control the logic pins as well as the serial interface. IFLO The IFLO output port provides an output signal at the IF VCO frequency with a typical -12dBm output power. Enable the IFLO port by setting the BUF_EN bit in the OPCTRL register. REF REF is the reference frequency input to the RF and IF PLL. The REF port is AC-coupled. Make sure the reference signal has low phase noise, similar to that of a TCXO. _______________________________________________________________________________________ MAX2370 Evaluation Kit Table 2. Jumpers JUMPER NUMBER ASSOCIATED FUNCTIONAL BLOCK JU1 VCC for VCCDRIVER JU2 Not used RFL JU3 Not used The MAX2370 evaluation kit is shipped with a matching network optimized for 400MHz to 500MHz. This matching network can be retuned to be optimized for evaluation at other RF frequencies. JU4 VGC jumper JU6 VCC for PA predrivers JU7 VCC for RF mixer JU8 VCC for IF modulator IFIN± and IFOUT± The MAX2370 evaluation kit is shipped configured for individual IF modulator and RF upconverter evaluation. IFIN± and IFOUT± are matched to 50Ω at 120MHz and on-board baluns at each port convert from differential to single-ended signals. For cascaded evaluation, a 120MHz bandpass filter must be connected between the board’s IFIN and IFOUT SMA connectors. A 50Ω filter with a typical 4dB insertion loss is recommended to achieve the cascaded specifications quoted in the MAX2370 data sheet. VBAT/VREG VBAT is the supply voltage to the PA driver circuitry. VREG is the supply voltage to all MAX2370’s circuits other than the PA driver. The VREG header must be connected to VBAT or connected to a separate 3V supply for proper operation. Jumpers are provided to enable current measurement to each functional block of the IC (Table 2). RBIAS Resistor R74 (nominally 10kΩ) connects from RBIAS to ground and sets the bias current for the upconverters and PA driver stages. Output linearity or efficiency may be improved by adjusting the PA driver current through the I-MULT bits in the ICC control register. JU9 VCC for digital interface JU10 VCC for RF charge pump Layout Considerations The MAX2370 EV kit can serve as a guide for your board layout. Keep PC board trace lengths as short as possible to minimize parasitics. Place decoupling capacitors as close to the IC as possible with a direct connection to the PC board’s ground plane. Do not share decoupling capacitor ground vias with other ground connections. PC Board Construction The MAX2370 EV kit PC board uses a 14-mil-wide trace for 50Ω transmission line. The PC board has an 8-millayer profile on FR4 with a dielectric constant of 4.5. INTF2300 SPI Interface Board The INTF2300 interface board is used to interface 3-wire SPI protocol from a PC’s parallel port to the EV kit. This board will level translate 5V logic from the PC to VCC of the EV kit (this will typically be 3V logic). The INTF2300 also provides buffering and EMI filtering. Its absolute maximum supply voltage is 4.6V, limited by the breakdown of the buffer IC. The recommended operating supply voltage range is +2.7V to +3.6V. Component Suppliers SUPPLIER Alpha Industries PHONE 617-935-5150 WEBSITE www.alphaindustries.com AVX 803-946-0690 www.avxcorp.com Coilcraft 847-639-6400 www.coilcraft.com Johnson 507-833-8822 www.johnsoncomponents.com Murata 770-436-1300 www.murata.com Toko 708-297-0070 www.tokoam.com Note: Indicate that you are using the MAX2370 when contacting these suppliers. _______________________________________________________________________________________ 5 Evaluates: MAX2370 LOL The MAX2370 EV kit requires an external RF local oscillator for evaluation. A low-noise RF signal generator can be connected to the EV kit’s LOL port to act as the local oscillator. The minimum input level at the LOL port is -15dBm. Evaluates: MAX2370 MAX2370 Evaluation Kit GND VCC JU1 DB25M 1 2 3 1 1 TO PC PARALLEL PORT 20 6 10 INTF2300 MAX2370 10 VBAT 20 6 GND 1 1 Figure 1. INTF2300 with MAX2370 EV Kit Providing Filtered Supply 6 _______________________________________________________________________________________ _______________________________________________________________________________________ 3 2 1 4 FL1 OPEN 10 9 7 8 SMA IFIN TXGATE R44 OPEN T2 R72 2.4k 1 2 3 C7 1000pF SMA IFOUT C53 10pF J27 L5 220nH C54 10pF C10 1000pF C80 100pF VCCMXR C2 100pF Q1 CMPT8099 C48 OPEN C11 OPEN R49 OPEN R5 1k R4 1k VCCDRIVER VCCMOD 4 6 L16 OPEN J24 IDLE 2 D3 SMLED 1 4 6 C51 1.5pF R34 0 R71 130k T3 R3 51k 1 2 3 R73 OPEN R39 0 R74 10k C50 9.1pF L3 100nH L2 100nH 9.1pF LOCK TEST POINT RBIAS TEST POINT LOCK VCCD RBIAS N.C. N.C. IFIN- IFIN+ 13 47 14 R63 560 5% TXGATE V CC IDLE V CC DRV LOCK N.C. RFOUT C81 1000pF VCCMOD C47 12 11 10 9 8 7 6 5 4 3 2 1 48 46 J21 N.C. +5V C55 0.01uF SMA LOL GND C1 100pF 15 45 GND R33 0 44 17 43 U1 42 18 19 EP MAX2370 R55 OPEN C49 2.7pF R25 0 16 N.C. J1 LO N.C. SMA RFOUT N.C. IFOUT- 41 39 38 22 V GC JU4 C16 100pF 24 C17 0.01uF 23 37 R10 OPEN I+ I- SHDN V CC IFLO TANK- TANK+ N.C. N.C. N.C. N.C. REF R41 100 1% Q- R15 OPEN I+ R51 511 1% R50 511 1% R42 100 1% I- VEE INA+ INA- OUTA 4 3 2 1 R8 511 1% R14 100 1% J16 SMA REF + - C63 1000pF C20 1000pF R62 0 C6 4.7pF R21 100 1% R6 OPEN L9 56nH R17 OPEN C28 0.033uF C84 OPEN C85 OPEN R12 OPEN 25 26 27 28 29 30 31 32 33 34 35 36 Q+ C31 1000pF VCCD C76 1000pF VCCD VCCMOD R29 1k 21 R58 OPEN 20 40 C78 1000pF VCCCP R57 0 V CCRFCP GC C66 100pF C65 100pF RFCP V CC L1 47nH V CC V CC C39 100pF RFPLL IFOUT+ V CCIFCP Q- GND CLK CLK DI DI CS CS IFCP Q+ J20 U4 C21 1000pF C19 1000pF J25 SMA IFLO D5 D4 MAX412 R48 511 1% C22 33pF C23 33pF +5V INB+ INB5 OUTB 6 VCC 7 8 4 3 2 1 VEE INA+ INA- OUTA R30 1k R32 5.1k R31 5.1k + - R28 511 1% U4 R64 20k C35 1000pF +5V R45 1K 1% INB5 INB+ VCC 7 OUTB 6 8 SHDN C29 0.022uF MAX412 VCCMOD C13 OPEN R38 0 R18 39 1% + C70 22uF R13 680 5% C18 1000pF C32 1uF J3 BNC Q R22 680 5% C30 1000pF R16 511 1% VREG R23 1k 1% C71 22uF R9 39 1% + J27 BNC I Evaluates: MAX2370 SMA LOH + C57 0.01uF + VCCPA MAX2370 Evaluation Kit Figure 2. MAX2370 EV Kit Schematic (Sheet 1 of 2). Note: This schematic only represents components that are placed. 7 8 GND +5V GND VREG GND VBAT JU12 JU15 JU16 JU14 JU13 JU11 + +5V + VREG + VBAT C74 10uF 10V C86 10uF 10V C77 10uF 10V C75 0.1uF C94 1uF C42 0.1uF C93 0.1uF JU10 JU9 JU8 JU7 JU1 JU6 C88 0.1uF C91 0.1uF VCCCP VCCD C97 0.1uF C96 0.1uF C95 0.1uF VCCMOD VCCMXR C5 0.1uF VCCDRIVER VCCPA CS R47 47k VCCD CLK C45 15pF DI VCCD INTERFACE R54 470 SHDN LOCK C46 15pF R56 470 C44 15pF L19 220nH R1 47k R1 47k VCCD TXGATE R27 10k IDLE R43 470 C15 0.01uF R1 47k VCCD JP1-1 JP1-3 LOCK JP1-5 CLK JP1-7 CS JP1-9 DI JP1-11 VCCD JP1-13 SHDN JP1-15 IDLE JP1-17 JP1-19 TXGATE JP1-2 JP1-4 JP1-6 JP1-8 JP1-10 JP1-12 JP1-14 JP1-16 JP1-18 JP1-20 Evaluates: MAX2370 MAX2370 Evaluation Kit Figure 2. MAX2370 EV Kit Schematic (Sheet 2 of 2) _______________________________________________________________________________________ MAX2370 Evaluation Kit Evaluates: MAX2370 Figure 3. MAX2370 EV Kit Component Placement Guide—Component Side (Top View) _______________________________________________________________________________________ 9 Evaluates: MAX2370 MAX2370 Evaluation Kit Figure 4. MAX2370 EV Kit Component Placement Guide—Solder Side (Bottom View) 10 ______________________________________________________________________________________ MAX2370 Evaluation Kit Evaluates: MAX2370 Figure 5. MAX2370 EV Kit PC Board Layout—Component Side (Top View) Figure 6. MAX2370 EV Kit PC Board Layout—Inner Layer 2 (Ground Plane, Top View) Figure 7. MAX2370 EV Kit PC Board Layout—Inner Layer 3 (Top View) Figure 8. MAX2370 EV Kit PC Board Layout—Solder Side (Bottom View) 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 ____________________ 11 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.