MAX2902EGI datasheet(7/18 Pages) MAXIM

Part #	MAX2902EGI

Description	200mW Single-Chip Transmitter ICs for 868MHz/915MHz ISM Bands

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Manufacturer	MAXIM [Maxim Integrated Products]

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Typical Operating Characteristics (continued)

(MAX290_ EV kits. VCC = +4.5V, fRF = 917.28MHz (MAX2900/MAX2901/MAX2902) or fRF = 868MHz (MAX2903/MAX2904), RRLPF =

68k

Ω, RPWRSET = 22kΩ, VASK = VREG, fREF = 14.56MHz (MAX2900/MAX2901/MAX2902) or fREF = 13.78MHz (MAX2903/MAX2904),

chip rate on MODIN = 1.22 Mbps, RF output matching network optimized for +23dBm, VCC = 4.5V, TA = +25°C, unless

otherwise noted.)

200mW Single-Chip Transmitter ICs for

868MHz/915MHz ISM Bands

_______________________________________________________________________________________

7

RF POWER vs. FREQUENCY

(MAX2903/MAX2904)

FREQUENCY (MHz)

872

868

864

13

14

15

16

17

12

860

876

VCC = +3.6V

VCC = +3.0V

VCC = +2.7V

RF OUTPUT MATCHING

OPTIMIZED FOR +14dBm

OUTPUT AT VCC = +3.0V

OUTPUT SPECTRUM WITH 600kHz

SQUARE WAVE INPUT AT MODIN

30dBm

-70dBm

10dB/div

MKR

917.31MHz

-16.33dBm

CENTER 917.28MHz

SPAN 20MHz

OUTPUT SPECTRUM WITH PN SEQUENCE

AT 1.22MHz AT MODIN

30dBm

-70dBm

10dB/div

MKR

917.35MHz

8.17dBm

CENTER 917.28MHz

SPAN 20MHz

RF OUT RISE AND FALL TIME TRANSIENT

WITH SQUARE OOK

0dBVp-p

-100dBVp-p

10dB/div

Tr

Tf

START 46

µs

STOP 86

µs

RF OUT RISE AND FALL TIME TRANSIENT

WITH SQUARE ASK

22dBVp-p

-78dBVp-p

10dB/div

Tr

Tf

START 45

µs

STOP 85

µs

SPURIOUS LEVEL FROM

DC TO 7TH HARMONIC

MKR

910MHz

23.17dBm

30dBm

-70dBm

10dB/div

START 0Hz

STOP 7GHz

SPURIOUS LEVEL BETWEEN

±50MHz

FROM CARRIER FREQUENCY

30dBm

-70dBm

10dB/div

CENTER 917.28MHz

SPAN 100MHz

TRANSMITTER EFFICIENCY vs. RPWRSET

RPWRSET (k

Ω)

38

34

30

26

22

18

15

20

25

30

35

40

45

10

14

A

B

C

E

F

D

A: VCC = 4.5V, TA = -40

°C

B: VCC = 4.5V, TA = +25

°C

C: VCC = 4.5V, TA = +85

°C

D: VCC = 2.7V, TA = -40

°C

E: VCC = 2.7V, TA = +25

°C

F: VCC = 2.7V, TA = +85

°C

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