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19-2581; Rev 0; 9/02
MAX2820/MAX2821 Evaluation Kits
General Description
The MAX2820/MAX2821 evaluation kits (EV kits) simplify testing of the MAX2820/MAX2821. The EV kits provide 50 SMA connectors for all RF and baseband inputs and outputs. Differential-to-single-ended and single-ended-todifferential line drivers are provided to convert the differential I/Q baseband inputs and outputs to single ended. The EV kits simplify evaluation of the MAX2820/ MAX2821s' receive and transmit performance in 802.11b applications operating in the 2.4GHz to 2.5GHz ISM band.
Features
On-Board Line Drivers and Voltage Reference 50 SMA Connectors on All RF and Baseband Ports PC Control Software Available at www.maxim-ic.com SPITM/QSPITM/MICROWIRETM Compatible
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Evaluate: MAX2820/MAX2821
Ordering Information
PART MAX2820EVKIT MAX2821EVKIT TEMP RANGE -40C to +85C -40C to +85C IC PACKAGE 48 QFN 48 QFN
Component List
DESIGNATION QTY C1, C3, C7, C10-C16, C20-C23, C25, C26, C28, C29, C33, C34, C35, C40, C50, C51 C2, C4, C5, C6, C8, C9, C17, C18, C19, C27, C36-C39, C41-C45 C24, C46, C47, C48 C30 C31 C32 C49 C52 C53, C54 C55, C56 J1, J2, J5, J6, J13, J14, J17 DESCRIPTION 0.01F 10% ceramic capacitors (0402) Murata GRP155R71C103K DESIGNATION QTY J3, J4, J7, J8, J11, J12, J15, J16 J9, J10, J18-J22 J23 19 0.1F 10% capacitors (0402) Murata GRP155R61A104K 10F 10%, 16V tantalum capacitors, C case AVX TAJC106K016 82pF 5% capacitor (0402) Murata GRP1555C1H820J 100pF 5% capacitor (0402) Murata GRP1555C1H101J 2000pF 10% capacitor (0402) Murata GRP155R71H202K 20pF 5% capacitor (0402) Murata GRP1555C1H200J 8200pF 10% capacitor (0402) Murata GRP155R71E822K 10pF 0.1pF capacitors (0402) Murata GRP1555C1H100B Not installed SMA connectors, edge mount EFJohnson 142-0701-801 Digi-Key J502-ND JP1-JP5, JP10, JP18-JP21 L1 L2, L3 L4 8 7 1 10 1 2 1 DESCRIPTION Not installed Test points Digi-Key 5000K-ND DB25 male connector, right angle AMP AMP747238-4 Digi-Key A2098-ND Not installed 0 5% resistor (0402) 6.8nH 5% inductors (0402) Murata LQG15HN6N8J02 5.6nH 0.3nH inductor (0402) Murata LQG15HN5N6S02 10k 10% variable resistors Trimmer-- Bourne 3296W-103 Potentiometer--Digi-Key 3296W-103ND 100 1% resistors (0402) 75 1% resistors (0402)
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4 1 1 1 1 1 2 2 7
R1, R2 R3, R4, R35 R5, R7, R13, R17, R21, R22, R29, R31 R6, R10, R16, R18, R19, R24, R26, R32, R34, R41, R42, R48, R49 R8, R14, R23, R30
2 3 8
13
0 5% resistors (0402)
4
10k 1% resistors (0402)
________________________________________________________________ Maxim Integrated Products
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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.
MAX2820/MAX2821 Evaluation Kits Evaluate: MAX2820/MAX2821
Component List (continued)
DESIGNATION QTY R9, R15, R25, R33, R36, R43, R44-R47, R50-R60 R11, R12, R20, R27, R28 R37 R38 R39 R40 T1 T2 TP1-TP5, TP7-TP11 TP6 U1, U5 U2, U6 U3 U4 U7 U8 DESCRIPTION
* * *
Two HP8648 or equivalent signal sources capable of generating 0dBm up to 3GHz 802.11b waveform generator HP8561E or equivalent RF spectrum analyzer with a minimum frequency range of 100kHz to 3GHz TDS3012 or equivalent oscilloscope with 200MHz bandwidth IBM PC or compatible with Windows 95/98 (R) , Windows 2000(R), Windows NT(R) 4.0, or later operating system and an available parallel port Male-to-male 25-pin parallel cable, straight through
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Not installed
*
5 1 1 1 1 1 1 10 1 2 2 1 1 1 1 49.9 1% resistors (0402) 12.1k 1% resistor (0402) 2.43k 1% resistor (0402) 1.82k 1% resistor (0402) 27.4k 1% resistor (0402) Chip hybrid balun Murata LDB212G4020C-001 Chip hybrid balun Murata LDB212G4005C-001 Test points Digi-Key 5000K-ND Not installed MAX4447ESE MAX4444ESE MAX6061BEUR MAX2820EGM/MAX2821ETM Octal buffer/driver Texas Instruments SN74LVTH244ADBR Digi-Key 296-1269-1-ND Not installed
*
*
Connections and Setup
This section provides step-by-step instructions for getting the EV kit up and running in all modes: 1) To control the MAX2820/MAX2821 through the 3-wire interface, connect the male-to-male 25-pin parallel cable between the PC and EV kit. 2) With the power supply turned off, connect a +2.7V power supply to the headers labeled VCC (J19) and VCCO (J10). Connect the power-supply ground to the header labeled GND (J18). 3) With the power supply turned off, connect a +5V power supply to the header labeled +5V (J22), and a -5V power supply to the header labeled -5V (J20). Connect the power-supply ground to the header labeled GND (J21). 4) Connect the low-noise signal source to ROSC (J17). 5) Install and run the MAX2820/MAX2821 control software. 6) With the MAX2820/MAX2821 control software active in the "Settings" screen, use Table 1 to set the operating mode to Shutdown. 7) Turn on the +5V and -5V power supplies, followed by the +2.7V power supply. 8) Set the low-noise signal source to 22MHz with an amplitude of -10dBm. Enable the signal source. Receive Mode To evaluate the MAX2820/MAX2821 in receive mode: 1) Connect an RF signal source to RX_RF (J2). Set the RF frequency to 2437.9MHz with an amplitude of -40dBm. 2) Connect RX_BBI (J5) to the spectrum analyzer. Set the spectrum analyzer to span from 100kHz to 5MHz. 3) Place the receive LNA in high-gain mode through the control software.
Quick Start
The MAX2820/MAX2821 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section.
Test Equipment Required
This section lists the recommended test equipment to verify the operation of the MAX2820/MAX2821. It is intended as a guide only, and substitutions may be possible. * DC supply capable of delivering +5.0V and 200mA of continuous current * * * DC supply capable of delivering -5.0V and 200mA of continuous current DC supply capable of delivering +2.7V and 200mA of continuous current HP8663A or equivalent low-noise signal source capable of generating a 22MHz or 44MHz reference oscillator signal
Windows 95/98, Windows 2000, and Windows NT are registered trademarks of Microsoft, Inc. 2 _______________________________________________________________________________________
MAX2820/MAX2821 Evaluation Kits
Component Suppliers
SUPPLIER AVX Digi-Key Murata Texas Instruments PHONE 843-448-9411 800-344-4539 770-436-1300 -- FAX 843-448-1943 218-681-3380 770-436-3030 -- WEBSITE www.avx.com www.digikey.com www.murata.com www.ti.com
Evaluate: MAX2820/MAX2821
Table 1. MAX2820/MAX2821 Control Settings
CONTROL MODES Shutdown Operating Mode Standby Transmit Receive LNA Gain RX_1K PROGRAM MODES LO Frequency Ref Frequency CP Current Power Amp Bias Receive LPF BW Variable 22MHz 44MHz Variable Variable Variable Sets LO frequency from 2400MHz to 2499MHz Sets PLL to work with 22MHz crystal oscillator Sets PLL to work with 44MHz crystal oscillator Sets charge-pump current between 1mA and 2mA Sets external power amplifier bias current Sets receive lowpass corner frequency from 6.0MHz to 8.5MHz High gain Low gain Enable Disable Device in shutdown mode Device in standby mode Device in transmit mode Device in receive mode Receive LNA in high-gain mode Receive LNA in low-gain mode Sets receive highpass corner frequency to 1kHz Sets receive highpass corner frequency to 10kHz
4) Verify that the LO frequency is set to 2437MHz through the control software. 5) Set the operating mode to "Receive" through the control software. 6) Measure the power of the 900kHz output tone on the spectrum analyzer display. Adjust RX_AGC (R2) between 0V and 2.0V to obtain a baseband output of -2dBm. Transmit Mode To evaluate the MAX2820/MAX2821 in transmit mode: 1) Connect a signal source to TX_BBI (J6). Set the signal source frequency to 900kHz with an amplitude of 400mVP-P (-4dBm). 2) Connect TX_RF (J1) to the spectrum analyzer. Set the spectrum analyzer to a center frequency of 2437MHz with a 20MHz span. 3) Verify that the LO frequency is set to 2437MHz through the control software.
4) Temporarily disable the baseband signal source output. Set the operating mode to "Transmit" through the control software. Enable the baseband signal source output. 5) Measure the amplitude of the upper sideband at 2437.9MHz using the spectrum analyzer. Adjust TX_GC (R1) to 0V to obtain the maximum RF output. 6) The observed output power should be roughly -5dBm due to driving only the I channel.
Layout Considerations
The MAX2820/MAX2821 EV kits can serve as guides for board layout. Keep PC board trace lengths as short as possible to minimize parasitic inductance. Also, keep decoupling capacitors as close to the IC as possible with a direct connection to the ground plane.
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MAX2820/MAX2821 Evaluation Kits Evaluate: MAX2820/MAX2821
Figure 1. MAX2820/MAX2821 EV Kits Schematic 4 _______________________________________________________________________________________
MAX2820/MAX2821 Evaluation Kits Evaluate: MAX2820/MAX2821
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Figure 2. MAX2820/MAX2821 EV Kits PC Board Layout--Top Silkscreen
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MAX2820/MAX2821 Evaluation Kits Evaluate: MAX2820/MAX2821
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Figure 3. MAX2820/MAX2821 EV Kits PC Board Layout-- Component Side
Figure 4. MAX2820/MAX2821 EV Kits PC Board Layout--Inner Layer 2
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Figure 5. MAX2820/MAX2821 EV Kits PC Board Layout--Inner Layer 3
Figure 6. MAX2820/MAX2821 EV Kits PC Board Layout-- Solder Side
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MAX2820/MAX2821 Evaluation Kits Evaluate: MAX2820/MAX2821
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Figure 7. MAX2820/MAX2821 EV Kits PC Board Layout--Bottom Silkscreen
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 _____________________ 7 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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