Datasheet

MAX2831/MAX2832
2.4GHz to 2.5GHz 802.11g/b
RF Transceivers with Integrated PA
______________________________________________________________________________________ 11
Rx I
CC
vs. V
CC
V
CC
(V)
I
CC
(mA)
MAX2831/32 toc01
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
61
62
63
64
65
66
67
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
NOISE FIGURE
vs. BASEBAND GAIN SETTINGS
BASEBAND GAIN SETTINGS
NF (dB)
MAX2831/32 toc02
02468101214161820222426283032
0
5
10
15
20
25
30
35
40
45
LNA = HIGH GAIN
LNA = MEDIUM GAIN
LNA = LOW GAIN
Rx VOLTAGE GAIN
vs. BASEBAND GAIN SETTING
BASEBAND GAIN SETTINGS
GAIN (dB)
MAX2831/32 toc03
02468101214161820222426283032
0
10
20
30
40
50
60
70
80
90
100
LNA = LOW GAIN
LNA = MEDIUM GAIN
LNA = HIGH GAIN
Rx IN-BAND OUTPUT P-1dB vs. GAIN
GAIN (dB)
OUTPUT P-1dB (dBV
RMS
)
MAX2831/32 toc04
15 25 35 45 55 75 85 95
-7
-6
-5
-4
-3
-2
-1
0
LNA MEDIUM/HIGH-
GAIN SWITCH POINT
LNA MEDIUM/LOW-
GAIN SWITCH POINT
Rx EVM vs. P
IN
P
IN
(dBm)
EVM (%)
MAX2831/32 toc05
-80 -70 -60 -50 -40 -30 -20 -10 0
0
2
4
6
8
10
12
14
16
18
20
22
LNA = HIGH GAIN
LNA = LOW GAIN
LNA = MEDIUM GAIN
Rx EVM vs. V
OUT
V
OUT
(dBV
RMS
)
EVM (%)
MAX2831/32 toc06
-29 -27 -25 -23 -21 -19 -17 -15 -13 -11 -9
0
0.5
1.0
1.5
2.0
2.5
3.0
P
IN
= -50dBm
LNA = HIGH GAIN
OFDM EVM WITH OFDM JAMMER
vs. OFFSET FREQUENCY
P
JAMMER
(dBm)
EVM (%)
MAX2831/32 toc07
-65 -55 -45 -35 -25
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
f
OFFSET
= 20MHz
f
OFFSET
= 25MHz
f
OFFSET
= 40MHz
P
IN
= -62dBm
Rx EMISSION SPECTRUM, LNA INPUT
MAX2831/32 toc08
RBW = 300kHz
VCO LEAKAGE
1.5 VCO LEAKAGE
2x VCO LEAKAGE
3x VCO
4x VCO
dBM
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
DC 26.5GHz
LNA = LOW GAIN
LNA INPUT RETURN LOSS
vs. RF FREQUENCY
RF FREQUENCY (MHz)
INPUT RETURN LOSS (dB)
MAX2831/32 toc09
2300 2350 2400 2450 2500 2550 2600
-30
-25
-20
-15
-10
-5
MID GAIN
LOW GAIN
HIGH GAIN
Typical Operating Characteristics
(MAX2831 EV kit, V
CC_
= 2.8V, V
CCPA
= V
CCTXPA
= 3.3V, T
A
= +25°C, f
LO
= 2.437GHz, f
REF
= 40MHz, SHDN = CS = high, RXHP =
SCLK = DIN = low.)