Datasheet

MAX2900–MAX2904
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
7
Maxim Integrated
Typical Operating Characteristics (continued)
(MAX290_ EV kits. V
CC
= +4.5V, f
RF
= 917.28MHz (MAX2900/MAX2901/MAX2902) or f
RF
= 868MHz (MAX2903/MAX2904), R
RLPF
=
68kΩ, R
PWRSET
= 22kΩ, VASK = VREG, f
REF
= 14.56MHz (MAX2900/MAX2901/MAX2902) or f
REF
= 13.78MHz (MAX2903/MAX2904),
chip rate on MODIN = 1.22 Mbps, RF output matching network optimized for +23dBm, V
CC
= 4.5V, T
A
= +25°C, unless
otherwise noted.)
RF POWER vs. FREQUENCY
(MAX2903/MAX2904)
MAX2900 toc10
FREQUENCY (MHz)
RF POWER (dBm)
872868864
13
14
15
16
17
12
860 876
V
CC
= +3.6V
V
CC
= +3.0V
V
CC
= +2.7V
RF OUTPUT MATCHING
OPTIMIZED FOR +14dBm
OUTPUT AT V
CC
= +3.0V
OUTPUT SPECTRUM WITH 600kHz
SQUARE WAVE INPUT AT MODIN
MAX2900 toc11
30dBm
-70dBm
10dB/div
MKR
917.31MHz
-16.33dBm
CENTER 917.28MHz
SPAN 20MHz
OUTPUT SPECTRUM WITH PN SEQUENCE
AT 1.22MHz AT MODIN
MAX2900 toc12
30dBm
-70dBm
10dB/div
MKR
917.35MHz
8.17dBm
CENTER 917.28MHz
SPAN 20MHz
RF OUT RISE AND FALL TIME TRANSIENT
WITH SQUARE OOK
MAX2900 toc13
0dBVp-p
-100dBVp-p
10dB/div
T
r
T
f
START 46μs
STOP 86μs
RF OUT RISE AND FALL TIME TRANSIENT
WITH SQUARE ASK
MAX2900 toc14
22dBVp-p
-78dBVp-p
10dB/div
T
r
T
f
START 45μs
STOP 85μs
SPURIOUS LEVEL FROM
DC TO 7TH HARMONIC
MAX2900 toc15
MKR
910MHz
23.17dBm
30dBm
-70dBm
10dB/div
START 0Hz
STOP 7GHz
SPURIOUS LEVEL BETWEEN ±50MHz
FROM CARRIER FREQUENCY
MAX2900 toc16
30dBm
-70dBm
10dB/div
CENTER 917.28MHz
SPAN 100MHz
TRANSMITTER EFFICIENCY vs. R
PWRSET
MAX2900 toc17
R
PWRSET
(kΩ)
TRANSMITTER EFFICIENCY (%)
383430262218
15
20
25
30
35
40
45
10
14
A
B
C
E
F
D
A: V
CC
= 4.5V, T
A
= -40°C
B: V
CC
= 4.5V, T
A
= +25°C
C: V
CC
= 4.5V, T
A
= +85°C
D: V
CC
= 2.7V, T
A
= -40°C
E: V
CC
= 2.7V, T
A
= +25°C
F: V
CC
= 2.7V, T
A
= +85°C