200mW Single-Chip Transmitter ICs for

868MHz/915MHz ISM Bands

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9

Pin Description (continued)

PIN

MAX2900

MAX2901

MAX2903

MAX2902

MAX2904

NAME

PIN TYPE

FUNCTION

15

15

15

GND

Supply Pin

Ground

16, 17

16, 17

16, 17

RF-, RF+

RF Output

RF differential output, open-collector type

18

—

—

N.C.

Not Connected

—

—

18

—

GND

Supply Pin

Ground

—

—

18

D.C.

Do Not Connect

—

19

—

19

N.C.

Not Connected

—

—

19

—

DIVOUT

ECL Output

Divider output

—

20, 21

20, 21

VCO-, VCO+

Open Collector

RF

VCO output (differential)

20

—

—

D1

Digital Input

Channel selection bit 1

21

—

—

D0

Digital Input

Channel selection bit 0

22

22

22

OSC

Analog Input

Crystal oscillator connection. See Typical

Operating Circuit.

23

23

23

REFIN

Analog Voltage

Input

Reference input pin analog (can be used as

input or as crystal oscillator driver). See

Typical Operating Circuit.

24

24

—

VCC4

Supply Pin

Power-supply pin for the synthesizer circuits.

Bypass with a 1000pF capacitor to GND as

close to the part as possible.

—

—

24

VCC4

Supply Pin

Power-supply pin for the digital circuits.

Bypass with a 100pF capacitor to GND as

close to the part as possible.

25

25

25

REFOUT

Analog Output

Buffered clock analog output pin

26

—

—

D2

Digital Input

Channel selection bit 2

—

26

—

DIV63

Digital Input

Division ratio selections (division ratio = 62

when DIV63 = high; division

ratio = 63 when DIV63 = low).

—

—

26

N.C.

Not Connected

—

27

27

—

VCC5

Supply Pin

Power-supply pin for charge pump circuits.

Bypass with a 100pF capacitor to GND as

close to the part as possible.

—

—

27

VCC5

Supply Pin

Power-supply pin. Bypass with a 100pF

capacitor to GND as close to the part as

possible.

28

28

—

CPOUT

Analog Output

Charge pump output pin

—

—

28

D.C.

Do Not Connect

—

GROUND

GROUND

GROUND

GROUND

Electrical

Ground

Back side of package is connected to

ground.