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19-0375; Rev 0; 5/05
MAX2370 Evaluation Kit
General Description
The MAX2370 evaluation kit (EV kit) simplifies the testing and evaluation of the MAX2370 quadrature transmitter. The EV kit provides 50 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. 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.
Features
o 50 SMA Connectors on All RF Ports o BNC Connectors for Baseband Inputs o Fully Assembled and Tested o Low-Power Shutdown Mode o SPITM/QSPITM/MICROWIRETM Compatible o PC Control Software (Available at www.maxim-ic.com)
Evaluates: MAX2370
SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
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 DESCRIPTION 100pF 5% ceramic capacitors (0402) Murata GRM1555C1H101J PART MAX2370EVKIT
Ordering Information
TEMP RANGE -40C to +85C IC PACKAGE 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
0.1F 10% ceramic capacitors (0402) Murata GRM155R61C104K 4.7pF 0.1pF ceramic capacitor (0402) Murata GRM1555C1H4R7B 1000pF 10% ceramic capacitors (0402) Murata GRM155R71H102K 0.01F 10% ceramic capacitors (0402) Murata GRM155R71C103K 1.2pF 0.1pF ceramic capacitor (0402) Murata GRM1555C1H1R2B 33pF 5% ceramic capacitors (0402) Murata GRM1555C1H330J
11
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
1
1
*
12
*
7
* * *
1 2
________________________________________________________________ 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.
MAX2370 Evaluation Kit Evaluates: MAX2370
Component List (continued)
DESIGNATION C24, C25 QTY 2 DESCRIPTION 9pF 0.1pF ceramic capacitors (0402) Murata GRM1555C1H9R0B 0.033F 10% ceramic capacitor (0402) Murata GRM155R71A333K 0.022F 10% ceramic capacitor (0402) Murata GRM155R71C223K 1.0F 10% ceramic capacitor (0805) Murata GRM21BR71C105K 3300pF 10% ceramic capacitor (0402) Murata GRM155R71H332K 0.047F 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 C70, C71 QTY 2 DESCRIPTION 22F 10% tantalum capacitors (B-case) AVX TAJB226K010 1.0F 10% ceramic capacitors (0603) Murata GRM188R61A105K 10F 20% tantalum capacitors (B-case) AVX TAJB106K010 Varactor diodes Alpha Industries SMV1763-079 LED Open Open SMA connectors--edge mount Johnson 142-0701-801 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
C28
1
C72, C73, C94
3
C29
1
C74, C77, C86 D1, D2, D4, D5 D3 FL1 FL2 J1, J16, J20, J21, J24, J25, J27 J2, J6, J22 J3, J7 JP1 JU1-JU4, JU6, JU7-JU10 JU1, JU6-JU10 JU11-JU16, LOCK TESTPOINT, RBIAS
3 4 1 0 0 7 0 2 1 9 6
C32
1
C36
1
C37 C44, C45, C46 C47, C50
1 3 2
C49
1
C51 C53, C54
1 2
8
* *
I/Q arbitrary waveform generator or CDMA generator (Agilent E4433B or equivalent) PC (486DX33 or better) with Windows(R) 95/98/2000/ NT 4.0 or later operating system and an available parallel port INTF2300 interface board and cable (supplied with EV kit)
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. 3) Connect a +3V power supply to the headers labeled VBAT and VREG. The INTF2300 board derives its power from the MAX2370 EV kit. 4) Connect a +5V power supply to the header labeled +5V. 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. 6) With its output disabled, connect the RF signal generator to the LOL port. Set its frequency to 575MHz and its amplitude to -10dBm.
*
Connections and Setup
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.
Windows is a registered trademark of Microsoft Corp. 2
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MAX2370 Evaluation Kit
Component List (continued)
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 QTY DESCRIPTION 1 47nH 5% inductor (0603) 2 100nH 5% inductors (0603) 0 2 1 1 2 7 1 4 Open 220nH 5% inductors (0603) 56nH 5% inductor (0603) 11nH 5% inductor (0603) npn transistors Central Semiconductor CMPT8099 47k 5% resistors (0402) 51k 5% resistor (0402) 1k 5% resistors (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 T2, T3 U1 0 Open U2 U3, U4 U5, U8 6 2 2 4 511 1% resistors (0805) 39.2 1% resistors (0805) 680 5% resistors (0805) 100 1% resistors (0402) V1 V2 V3 0 0 0 QTY DESCRIPTION 2 1k 1% resistors (0805) 7 2 4 1 3 1 1 1 1 2 1 1 2 2 0 5% resistors (0402) 10k 5% resistors (0402) 5.1k 5% resistors (0402) 12k 5% resistor (0402) 470 5% resistors (0402) 560 5% resistor (0402) 20k 5% resistor (0402) 130k 5% resistor (0402) 2.4k 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
Evaluates: MAX2370
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).
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.
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3
MAX2370 Evaluation Kit Evaluates: MAX2370
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 50 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.
Table 1. Register Settings
REGISTER NAME RFM[17:0] RFR[12:0] IFM[13:0] IFR[10:0] OPCTRL[15:0] CONFIG[15:0] ICCCTRL[15:0] TEST[8:0] TYPICAL REGISTER SETTINGS 23000DEC 384DEC 4800DEC 384DEC 090FHEX D03FHEX 0C38HEX 100HEX REGISTER ADDRESS 0000b 0001b 0010b 0011b 0100b 0101b 0110b 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 50 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.
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.
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.
4
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MAX2370 Evaluation Kit
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
Table 2. Jumpers
JUMPER NUMBER JU1 JU2 JU3 JU4 JU6 JU7 JU8 JU9 JU10 ASSOCIATED FUNCTIONAL BLOCK VCC for VCCDRIVER Not used Not used VGC jumper VCC for PA predrivers VCC for RF mixer VCC for IF modulator VCC for digital interface VCC for RF charge pump
RFL
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.
IFIN and IFOUT
The MAX2370 evaluation kit is shipped configured for individual IF modulator and RF upconverter evaluation. IFIN and IFOUT are matched to 50 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 50 filter with a typical 4dB insertion loss is recommended to achieve the cascaded specifications quoted in the MAX2370 data sheet.
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.
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).
PC Board Construction
The MAX2370 EV kit PC board uses a 14-mil-wide trace for 50 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.
RBIAS
Resistor R74 (nominally 10k) 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.
Component Suppliers
SUPPLIER Alpha Industries AVX Coilcraft Johnson Murata Toko PHONE 617-935-5150 803-946-0690 847-639-6400 507-833-8822 770-436-1300 708-297-0070 www.alphaindustries.com www.avxcorp.com www.coilcraft.com www.johnsoncomponents.com www.murata.com www.tokoam.com WEBSITE
Note: Indicate that you are using the MAX2370 when contacting these suppliers. _______________________________________________________________________________________ 5
MAX2370 Evaluation Kit Evaluates: MAX2370
GND VCC DB25M 1 2 3
JU1
1
1
TO PC PARALLEL PORT 6
20
10
INTF2300
MAX2370
10
VBAT 6
20
GND 1 1
Figure 1. INTF2300 with MAX2370 EV Kit Providing Filtered Supply
6
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VCCPA J20 SMA LOH L1 47nH VCCCP C78 1000pF C76 1000pF VCCD J21 SMA LOL C55 0.01uF VCCD C1 100pF R57 0
C57 0.01uF
C39 100pF
J1
C66 100pF C65 100pF
SMA RFOUT
+5V
1 R3 51k LOCK J16 SMA REF C31 1000pF 48 LO N.C. GND GND GND N.C. V CC IFCP C28 0.033uF R6 OPEN 36 REF N.C. 34 LOCK N.C. N.C. U1 IDLE 6 V CC TANK+ TANKIFLO V CC SHDN II+ GC QR14 100 1% INA3 INA+ 4 VEE I+ R73 OPEN VCCMOD DI CS R10 OPEN CLK RBIAS TEST POINT C47 9.1pF J27 6 VCCMOD R63 560 5% C49 2.7pF R29 1k JU4 V GC R58 OPEN 2 4 L3 100nH 1 C81 1000pF C17 0.01uF T3 3 L2 100nH R25 0 C16 100pF C85 OPEN R12 OPEN R42 100 1% R74 10k IR48 511 1% R15 OPEN R8 511 1% R17 OPEN V CC V CC Q+ 25 C84 OPEN OUTA 2 + 26 R21 100 1% +5V 1 U4 MAX412 8 C18 1000pF R16 511 1% VCC 7 OUTB 6 27 C19 1000pF 28 C20 1000pF R30 1k 29 30 R62 0 C63 1000pF TXGATE EP IFIN+ IFINN.C. N.C. RBIAS CLK DI CS N.C. N.C. IFOUTIFOUT+ N.C. 32 31 R32 5.1k 33 D5 C22 33pF C13 OPEN C7 1000pF V CC DRV 5 4 L9 56nH C6 4.7pF C23 33pF R64 20k D4 R31 5.1k 35 R38 0 RFCP 47 46 45 44 43 42 41 40 39 38 37 VCCD
2
R72 2.4k
D3 SMLED R71 130k RFPLL RFOUT N.C. V CCRFCP V CCIFCP LOCK TEST POINT 1 2 3
Q1 CMPT8099
VCCDRIVER
R4 1k
C2 100pF
IDLE
C30 1000pF
VCCMXR C80 100pF 8 9 C10 1000pF 10 11 12 7
MAX2370
J25 SMA IFLO
C29 0.022uF
R5 1k
VCCMOD SHDN
TXGATE
R44 OPEN
R49 OPEN R34 0 13 14 15 16 17 18 19 20 21 22 23 24 R39 0
6 L5 220nH C51 1.5pF
T2
3
SMA IFIN
2
4
1
C53 10pF
C35 1000pF
C21 1000pF Q+ QR50 511 1%
+5V R45 1K 1% 1 OUTA 2 INAR51 511 1% INA+ VEE 3 4 + U4 MAX412 8 VCC 7 R18 39 1% C70 22uF + J3 BNC Q
SMA IFOUT
VCCMOD
C11 OPEN
8
9
7
10
FL1 OPEN C50 9.1pF R55 OPEN R33 0
L16 OPEN
4
1
C48 OPEN
Figure 2. MAX2370 EV Kit Schematic (Sheet 1 of 2). Note: This schematic only represents components that are placed.
R23 1k 1% C71 22uF + J27
Evaluates: MAX2370
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+ R41 100 1% OUTB 6 INB5 INB+ R28 511 1%
3
2
MAX2370 Evaluation Kit
+
-
J24
C54 10pF
BNC I INB5 INB+ VREG R22 680 5% R13 680 5% C32 1uF R9 39 1%
7
Evaluates: MAX2370
MAX2370 Evaluation Kit
8
VCCPA JU6 VCCD C88 0.1uF TXGATE R1 47k VCCD IDLE JP1-17 VCCD R1 47k R1 47k JP1-15 IDLE JP1-16 VCCMXR JU7 JP1-18 JP1-19 TXGATE JP1-20
VBAT
INTERFACE
JU11
VBAT VCCDRIVER C42 0.1uF JU1 C5 0.1uF
+
JU13
C77 10uF 10V
Figure 2. MAX2370 EV Kit Schematic (Sheet 2 of 2)
C91 0.1uF SHDN L19 220nH C15 0.01uF VCCD C95 0.1uF R47 47k CS C45 15pF CLK C96 0.1uF C46 15pF LOCK VCCCP JU10 JP1-1 C97 0.1uF JP1-2 R27 10k R56 470 DI C44 15pF R54 470 R43 470 JP1-13 SHDN JP1-14 VCCMOD JU8 JP1-11 VCCD JP1-12 JP1-9 DI JP1-10 C94 1uF JU9 C93 0.1uF VCCD JP1-7 CS JP1-8 JP1-5 CLK JP1-6 JP1-3 LOCK JP1-4 C75 0.1uF
GND
VREG
JU14
VREG
+
JU16
C86 10uF 10V
GND
+5V
JU15
+5V
+
JU12
C74 10uF 10V
_______________________________________________________________________________________
GND
MAX2370 Evaluation Kit Evaluates: MAX2370
Figure 3. MAX2370 EV Kit Component Placement Guide--Component Side (Top View)
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9
MAX2370 Evaluation Kit Evaluates: MAX2370
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 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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