Datasheet

MAX2900–MAX2904
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
6
Maxim Integrated
Typical Operating Characteristics
(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.)
SUPPLY CURRENT vs. V
CC
MAX2900 toc01
V
CC
(V)
SUPPLY CURRENT (mA)
4.03.53.0
90
100
110
120
130
140
150
160
80
2.5 4.5
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
SHUTDOWN CURRENT vs. V
CC
MAX2900 toc02
V
CC
(V)
SHUTDOWN CURRENT (μA)
4.03.53.0
1
10
100
0.1
2.5 4.5
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
OUTPUT POWER vs. V
CC
MAX2900 toc03
V
CC
(V)
OUTPUT POWER (dBm)
4.03.53.0
18
20
22
24
26
16
2.5 4.5
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
VCO PHASE NOISE AT 917.28MHz
MAX2900 toc04
-40dBc/Hz
-140dBc/Hz
FREQUENCY OFFSET (MHz)
VCO SUPPLY PUSHING vs. V
CC
MAX2900 toc05
V
CC
(V)
OUTPUT FREQUENCY (MHz)
4.03.53.0
915.5
916.0
916.5
917.0
917.5
918.0
915.0
2.5 4.5
PLL LOCK TIME
MAX2900 toc06
100kHz
-100kHz
START 0s
20kHz/div
STOP 30μs
LOWPASS FILTER 3-dB RESPONSE
vs. R
RLPF
MAX2900 toc07
R
RLPF
(kΩ)
LOWPASS FILTER 3-dB BANDWIDTH (kHz)
6050403020
500
1000
1500
2000
2500
3000
3500
0
10 70
BPSK MODULATION OUTPUT vs. TIME
MAX2900 toc08
225deg
-225deg
45deg/div
START 0s
STOP 40μs
RF POWER vs. FREQUENCY
(MAX2900/MAX2901/MAX2902)
MAX2900 toc09
FREQUENCY (MHz)
RF POWER (dBm)
925920915910905
19
20
21
22
23
24
25
18
900 930
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