MAX2820EV

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-to-
differential line drivers are provided to convert the differ-
ential 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

Evaluate: MAX2820/MAX2821

MAX2820/MAX2821 Evaluation Kits

________________________________________________________________ Maxim Integrated Products

19-2581; Rev 0; 9/02

Component List

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.

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

PART

TEMP RANGE

IC PACKAGE

MAX2820EVKIT

-40

°C to +85°C

48 QFN

MAX2821EVKIT

-40

°C to +85°C

48 QFN

DESIGNATION

QTY

DESCRIPTION

C1, C3, C7,

C10C16,

C20C23, C25,

C26, C28, C29,
C33, C34, C35,

C40, C50, C51

0.01µF

±10% ceramic capacitors

(0402)
Murata GRP155R71C103K

C2, C4, C5,
C6, C8, C9,

C17, C18, C19,

C27, C36C39,

C41C45

0.1µF

±10% capacitors (0402)

Murata GRP155R61A104K

C24, C46, C47,

C48

10µF

±10%, 16V tantalum capacitors,

C case
AVX TAJC106K016

C30

82pF

±5% capacitor (0402)

Murata GRP1555C1H820J

C31

100pF

±5% capacitor (0402)

Murata GRP1555C1H101J

C32

2000pF

±10% capacitor (0402)

Murata GRP155R71H202K

C49

20pF

±5% capacitor (0402)

Murata GRP1555C1H200J

C52

8200pF

±10% capacitor (0402)

Murata GRP155R71E822K

C53, C54

10pF

±0.1pF capacitors (0402)

Murata GRP1555C1H100B

C55, C56

Not installed

J1, J2, J5, J6,

J13, J14, J17

SMA connectors, edge mount
EFJohnson 142-0701-801
Digi-Key J502-ND

DESIGNATION

QTY

DESCRIPTION

J3, J4, J7, J8,
J11, J12, J15,

J16

Not installed

J9, J10,

J18J22

Test points
Digi-Key 5000K-ND

J23

DB25 male connector, right angle
AMP AMP747238-4
Digi-Key A2098-ND

JP1JP5, JP10,

JP18JP21

Not installed

±5% resistor (0402)

L2, L3

6.8nH

±5% inductors (0402)

Murata LQG15HN6N8J02

5.6nH

±0.3nH inductor (0402)

Murata LQG15HN5N6S02

R1, R2

10k

±10% variable resistors

Trimmer-- Bourne 3296W-103
Potentiometer--Digi-Key 3296W-103-
ND

R3, R4, R35

100

±1% resistors (0402)

R5, R7, R13,

R17, R21, R22,

R29, R31

±1% resistors (0402)

R6, R10, R16,

R18, R19, R24,
R26, R32, R34,
R41, R42, R48,

R49

±5% resistors (0402)

R8, R14, R23,

R30

10k

±1% resistors (0402)

Evaluate: MAX2820/MAX2821

MAX2820/MAX2821 Evaluation Kits

_______________________________________________________________________________________

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 ver-
ify 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 refer-
ence oscillator signal

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

Windows 2000

, Windows NT

4.0, or later operat-

ing system and an available parallel port

Male-to-male 25-pin parallel cable, straight through

Connections and Setup

This section provides step-by-step instructions for get-
ting 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 oper-
ating 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.

DESIGNATION

QTY

DESCRIPTION

R9, R15, R25,

R33, R36, R43,

R44R47,

R50R60

Not installed

R11, R12, R20,

R27, R28

49.9

±1% resistors (0402)

R37

12.1k

±1% resistor (0402)

R38

2.43k

±1% resistor (0402)

R39

1.82k

±1% resistor (0402)

R40

27.4k

±1% resistor (0402)

Chip hybrid balun
Murata LDB212G4020C-001

Chip hybrid balun
Murata LDB212G4005C-001

TP1TP5,

TP7TP11

Test points
Digi-Key 5000K-ND

TP6

Not installed

U1, U5

MAX4447ESE

U2, U6

MAX4444ESE

MAX6061BEUR

MAX2820EGM/MAX2821ETM

Octal buffer/driver
Texas Instruments
SN74LVTH244ADBR
Digi-Key 296-1269-1-ND

Not installed

Component List (continued)

Windows 95/98, Windows 2000, and Windows NT are
registered trademarks of Microsoft, Inc.

Evaluate: MAX2820/MAX2821

MAX2820/MAX2821 Evaluation Kits

_______________________________________________________________________________________

SUPPLIER

PHONE

FAX

WEBSITE

AVX

843-448-9411

843-448-1943

www.avx.com

Digi-Key

800-344-4539

218-681-3380

www.digikey.com

Murata

770-436-1300

770-436-3030

www.murata.com

Texas Instruments

www.ti.com

Component Suppliers

CONTROL MODES

Shutdown

Device in shutdown mode

Standby

Device in standby mode

Transmit

Device in transmit mode

Operating Mode

Receive

Device in receive mode

High gain

Receive LNA in high-gain mode

LNA Gain

Low gain

Receive LNA in low-gain mode

Enable

Sets receive highpass corner frequency to 1kHz

RX_1K

Disable

Sets receive highpass corner frequency to 10kHz

PROGRAM MODES

LO Frequency

Variable

Sets LO frequency from 2400MHz to 2499MHz

22MHz

Sets PLL to work with 22MHz crystal oscillator

Ref Frequency

44MHz

Sets PLL to work with 44MHz crystal oscillator

CP Current

Variable

Sets charge-pump current between 1mA and 2mA

Power Amp Bias

Variable

Sets external power amplifier bias current

Receive LPF BW

Variable

Sets receive lowpass corner frequency from 6.0MHz to 8.5MHz

Table 1. MAX2820/MAX2821 Control Settings

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 sig-

nal source frequency to 900kHz with an amplitude
of 400mV

P-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 pos-
sible with a direct connection to the ground plane.

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