5) Connect the power sensor to the coupler. Connect

one of the remaining terminals of the coupler to the

20dB high-power attenuator and another end to the

spectrum analyzer.

6) Place the

SHDN jumper in the ON position.

7) Turn on the DC supply. The idle current should read

approximately 250mA.

8) Activate the RF generator output. Set the RF gener-

ator’s output to produce a reading of +23dBm on

the power meter. Adjust the supply voltage so that

the voltmeter reads +3.3V. Adjust the output of the

generator until the power meter reads +24dBm.

• The supply current should increase to approxi-

mately 315mA.

• The ACPR/ALT measurements should meet the

MAX2247 EC table specifications.

Lower Power Applications

+21dBm, +18dBm, and +15dBm applications by

changing the position of C3 and the bias current and

removing C33. (See Table 2 and Applications Notes.)

Layout

The EV kit’s PC board can serve as a guide for laying

out a board using the MAX2247.

Keep RF signal lines as short as possible to minimize

losses and radiation. Always use controlled impedance

lines on all high-frequency inputs and outputs, and use

low-inductance connections to ground on all GND pins.

decoupling capacitor. Using a star topology for the

further minimize coupling between the sections of the

IC. (Refer to the MAX2247 data sheet.)

MAX2247 Evaluation Kit

2

_______________________________________________________________________________________

EQUIPMENT

QTY

DESCRIPTION

Power Supply

1

Capable of delivering up to 500mA at +2.7V to +3.6V

RF Signal Generator

1

Capable of delivering +10dBm of output power up to 2.5GHz with 802.11b-compatible source

RF Power Sensor

1

Capable of handling +20dBm of output power at the operating frequency (HP 8482A, or equivalent)

20dB High-Power

Attenuator

1—

Power Meter

1

Capable of handling +20dBm of output power at the operating frequency (HP EPM-441A, or

equivalent)

Coupler

1

Capable of operating at the desired frequency

RF Spectrum

Analyzer

1

Capable of measuring ACPR/ALT and covering the MAX2247’s operating frequency range

(Rohde and Schwarz FSEA20, or equivalent)

Ammeter/Voltmeter

2

—

50

Ω SMA Cables

2

—

Network Analyzer

(Optional)

1

For measuring small-signal return loss and gain

Table 1. Test Equipment Required

+21dBm, +18dBm, and +15dBm Applications

C3 LOCATION

+21

7

6.1k

Ω (135mA)

+18

6

12k

Ω (75mA)

+15

6

13k

Ω (65mA)