5GHz, 4-Channel MIMO Transmitter
_______________________________________________________________________________________ 9
  Typical Operating Characteristics
(V
CC
 = 2.8V, f
LO
= 5.35GHz, f
REF
= 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, T
A
 = +25NC, using the MAX2850 Evaluation Kit.)
Rx MODE SUPPLY CURRENT
SUPPLY VOLTAGE (V)
3.5
3.4
3.2
3.3
2.8
2.9
3.0
3.1
2.7
133
134
135
136
137
138
139
140
141
132
2.6
3.6
T
A
 = +85癈
T
A
 = -20癈
T
A
 = +25癈
Rx
 
NOISE FIGURE vs. VGA GAIN
SETTINGS (BALUN INPUT REFERRED)
Rx VGA GAIN SETTINGS
13
12
10 11
3  4  5  6  7  8  9
1  2
5
10
15
20
25
30
35
40
45
0
0
14 15
MAX - 40dB
MAX - 32dB
MAX - 24dB
MAX - 16dB
MAX - 8dB
MAX
Rx
 
MAXIMUM GAIN vs. FREQUENCY
FREQUENCY (GHz)
5.7
5.5
5.3
5.1
30
40
50
60
70
80
20
4.9
5.9
LNA = MAX GAIN
LNA = MAX - 8dB
LNA = MAX - 16dB
LNA = MAX - 24dB
LNA = MAX - 32dB
LNA = MAX - 40dB
Rx
 
MAXIMUM GAIN vs.
TEMPERATURE AND FREQUENCY
FREQUENCY (GHz)
5.7
5.5
5.3
5.1
63
64
65
66
67
68
69
70
71
62
4.9
5.9
T
A
 = -20癈
T
A
 = +25癈
T
A
 = +85癈
Rx GAIN vs. BASEBAND VGA GAIN
BASEBAND VGA GAIN CODE
14
12
8
10
4
6
2
0
10
20
30
40
50
60
70
80
-10
0
16
LNA = MAX
LNA = MAX - 8dB
LNA = MAX - 24dB
LNA = MAX - 32dB
LNA = MAX - 40dB
LNA = MAX - 16dB
Rx OUTPUT V
1dB
 vs. GAIN SETTING
BASEBAND VGA GAIN CODE
14
12
2
4    6
8    10
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.20
0
T
A
 = -20癈
T
A
 = +85癈
T
A
 = +25癈
Rx EVM vs. INPUT POWER
(CHANNEL BANDWIDTH = 20MHz)
INPUT POWER (dBm)
-10
-30
-50
-70
-35
-30
-25
-20
-15
-40
-90
10
LNA = MAX
LNA = MAX = -8dB
LNA = MAX = -16dB
LNA = MAX = -24dB
LNA = MAX = -32dB
LNA = MAX = -40dB
Rx EVM vs. Rx BASEBAND
OUTPUT LEVEL
Rx BASEBAND OUTPUT LEVEL (dBV
rms
)
-5
-10
-15
-20
-25
2
4
6
8
10
12
0
-30
0
VGA GAIN = 0
VGA GAIN = 2/4/6/8/10/12/14
VGA GAIN =
3/5/7/9/11/13/15
Rx EVM vs. OFDM JAMMER POWER AT
20MHz AND 40MHz OFFSET FREQUENCY
WITH WANTED SIGNAL AT -66dBm
INPUT POWER (dBm)
5
0
-5
-10
-15
-20
-25
-30
-35
2
4
6
8
10
12
14
0
-40
10
20MHz OFFSET
40MHz OFFSET
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