MAX2645 Evaluation Kit

2

_______________________________________________________________________________________

Test Equipment Required

This section lists the test equipment required for evalu-

ating the MAX2645:

•

One DC power supply capable of supplying 20mA

of supply current over the supply voltage range

+3.0V to +5.5V

•

One RF-signal generator or equivalent (50

Ω) sine-

wave source capable of delivering at least -10dBm

of output power up to 3.8GHz (HP 8648, for exam-

ple)

•

One RF-spectrum analyzer or equivalent with a

frequency range of at least 4GHz (HP 8561E, for

example)

•

Two 50

Ω SMA cables (RG-58A/U or equivalent)

•

Optional: Digital multimeters (DMMs) to monitor DC

supply voltage and supply current

•

Optional: Power meter for calibrating system mea-

surements (HP 438A for example)

Connections and Setup

This section provides step-by-step instructions for set-

ting up the EV kit and ensuring proper operation:

1) DC Power Supply: Set the DC power supply volt-

age to +3.3V. Turn the power supply off and con-

nect it to the VCC and GND connections on the EV

kit. If desired, place an ammeter in series with the

power supply to measure supply current and a volt-

meter in parallel with the VCC and GND connec-

tions to measure supply voltage at the device.

2) RF Signal Generator: Connect one of the 50

Ω

SMA cables to the RF output of the signal genera-

tor. Set the RF frequency of the signal generator to

3.55GHz at an output power level of -20dBm. To

improve measurement accuracy, use a power

VCC

GAIN

RFIN

BIAS

GND

RFOUT

RFOUT

GND

GND

GND

MAX2645

SHDN

1

0

1

0

VCC

SHDN

JU2

GAIN

JU1

C9

1000pF

C10

10

µF

C4

0.75pF

40

°

294mils

8

8

7

9

C8

0.1

µF

C8

0.1

µF

C6

0.1

µF

C3

47pF

R3

1k

R2

1k

RFIN

1

2

3

4

5

C1

R1

C2

220pF

RADIAL STUB

*

Z1

APPLICATION CIRCUIT

LNA, LOW NF

LNA, HIGH INPUT IP3

PA PREDRIVER

C1

1000pF

0.01

µF

1.5pF

Z1

1.8nH

0.75pF

0.75pF

Ω)

20

20

15

3.3

3.3

5.0

BOARD THICKNESS = 0.012in, DIELECTRIC CONSTANT = 3.8

Figure 1. MAX2645 EV Kit Schematic