Quick Start

The following procedure allows for proper device eval-

uation.

Required Test Equipment

• One regulated power supply capable of providing

+3.0V

• One spectrum analyzer such as the Agilent 8562E

• One optional ammeter for measuring supply current

• One power meter such as the Agilent EPM-441A

Connections and Setup

This section provides a step-by-step guide to operating

the EV kit and testing the device’s functionality. Do not

turn on the DC power until all connections are made:

1) Connect a DC supply set to +3.0V, through an

ammeter, to the VDD and VSS terminals on the EV

kit. Do not turn on the supply.

2) Connect the RF OUT SMA connector to the spec-

trum analyzer. Set the analyzer to a center frequen-

cy of 315MHz (or 433.92MHz) and a span of 1MHz.

3) Turn on the DC supply. The spectrum analyzer

should display a peak of about +13dBm at 315MHz

(or 433.92MHz).

4) Disconnect the spectrum analyzer and connect the

power meter instead. Measure the output power

and also the current draw. Calculate the efficiency.

This is done using the following equation: Efficiency

5) For example, for an output of +13dBm, and a cur-

rent of 14.5mA (at 3.0V), the efficiency is 46%.

6) In order to transmit ASK data, remove the shunts at

JU1 and JU2, and connect DATA_IN to an external

data source.

MAX7044 Evaluation Kit

2

_______________________________________________________________________________________

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

R2

0

Not installed, 0

Ω resistor

(0603), any

R3

1

0

Ω resistor (0603), any

R5

1

47k

Ω ±5% resistor (0603), any

R6

1

15k

Ω ±5% resistor (0603), any

R7

1

33k

Ω ±5% resistor (0603),

any

RFOUT

1

SMA connector, top-mount

Digi-Key J500-ND

Johnson 142-0701-201

ANTENNA_OUT

1

RP-SMA connector

LINX CONREVSMA001

REF_IN

1

SMA connector, top-mount,

Digi-Key J500-ND

Johnson 142-0701-201

Antenna (315MHz)

0

315MHz 1/4-wave whip antenna,

not provided

Linx ANT-315-CW-RH

DESIGNATION

QTY

DESCRIPTION

Antenna (433MHz)

0

433MHz 1/4-wave whip antenna,

not provided

Lynx ANT-433-CW-RH

CLKOUT, VDD,

VSS, DATA_IN

4

Test points

Mouser 151-203 or equivalent

Y1 (315MHz)

1

Crystal, 9.84375MHz

Hong Kong Crystals

SSL9843750E03FAFZ800 or

Crystek 017000

Y1 (433MHz)

1

Crystal, 13.56MHz

Hong Kong Crystal

SSM1356000E03FAFZ800 or

Crystek 017001

BAT1

1

Battery holder

MPD BA2032

Battery

1

Coin-cell battery

Panasonic BR2032

U1

1

MAX7044AKA-T (8-pin SOT23)

None

3

Shunts (JU1)

Digi-Key S9000-ND or equivalent

None

1

MAX7044 EV kit PC board

SUPPLIER

PHONE

FAX

Coilcraft

800-322-2645

847-639-1469

Crystek

800-237-3061

941-561-1025

Hong Kong

Crystal

852-2412 0121

852-2498 5908

Murata

800-831-9172

814-238-0490

Component Suppliers

Note: Indicate that you are using the MAX7044 when contact-

ing these component suppliers.