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MAX2903EGI

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

Unspecified 

200mW Single-Chip Transmitter ICs for

868MHz/915MHz ISM Bands

Typical Operating Characteristics (continued)

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

68kΩ, 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.)

RF POWER vs. FREQUENCY

OUTPUT SPECTRUM WITH 600kHz

OUTPUT SPECTRUM WITH PN SEQUENCE

(MAX2903/MAX2904)

SQUARE WAVE INPUT AT MODIN

AT 1.22MHz AT MODIN

17

RF OUTPUT MATCHING

OPTIMIZED FOR +14dBm

16 OUTPUT AT VCC = +3.0V

VCC = +3.6V

30dBm

MKR

917.31MHz

-16.33dBm

30dBm

MKR

917.35MHz

8.17dBm

15

VCC = +3.0V

10dB/div

14

VCC = +2.7V

13

10dB/div

12

860

864

868

872

876

FREQUENCY (MHz)

RF OUT RISE AND FALL TIME TRANSIENT

WITH SQUARE OOK

0dBVp-p

Tr

Tf

-70dBm

CENTER 917.28MHz

SPAN 20MHz

RF OUT RISE AND FALL TIME TRANSIENT

WITH SQUARE ASK

22dBVp-p

Tr

Tf

-70dBm

CENTER 917.28MHz

SPAN 20MHz

30dBm

SPURIOUS LEVEL FROM

DC TO 7TH HARMONIC

MKR

910MHz

23.17dBm

10dB/div

10dB/div

10dB/div

-100dBVp-p

START 46μs

STOP 86μs

-78dBVp-p

START 45μs

-70dBm

STOP 85μs

START 0Hz

STOP 7GHz

30dBm

SPURIOUS LEVEL BETWEEN ±50MHz

FROM CARRIER FREQUENCY

10dB/div

TRANSMITTER EFFICIENCY vs. RPWRSET

45

A

40 B

C

35

D

E

F

30

-70dBm

CENTER 917.28MHz

SPAN 100MHz

25

A: VCC = 4.5V, TA = -40°C

20

B: VCC = 4.5V, TA = +25°C

C: VCC = 4.5V, TA = +85°C

15

D: VCC = 2.7V, TA = -40°C

E: VCC = 2.7V, TA = +25°C

F: VCC = 2.7V, TA = +85°C

10

14 18 22 26 30 34 38

RPWRSET (kΩ)

_______________________________________________________________________________________ 7

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