5GHz, 4-Channel MIMO Transmitter
______________________________________________________________________________________ 15
  Typical Operating Characteristics (continued)
(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.)
Tx EVM vs. OUTPUT POWER
(100mV
RMS
 54Mbps WLAN SIGNAL)t
OUTPUT POWER (dBm)
-5
-10
-15
-20
-25
-30
-35
-36
-34
-32
-30
-28
-38
-40
0
T
A
 = +25癈
T
A
 = -20癈
T
A
 = +85癈
Tx MAX OUTPUT POWER MEETING -33dB
EVM AND 802.11a SPECTRAL MASK
RF FREQUENCY (MHz)
5700
5500
5300
5100
-6
-4
-2
0
2
-8
4900
5900
t
T
A
 = -20癈
T
A
 = +25癈
T
A
 = +85癈
t
RF FREQUENCY (MHz)
-18
-28
-38
-48
-58
10dB/div
-68
-78
-88
-98
5300
5350
5400
TX2 OUTPUT SPECTRUM AT -5dBM
(20MHz CHANNEL BANDWIDTH,
802.11a 54Mbps)
0dBr
-40dBr
Tx CARRIER LEAKAGE
vs. RF FREQUENCY
RF FREQUENCY (MHz)
-60
-55
-50
-45
-40
-35
-65
T
A
 = -20癈
T
A
 = +85癈
T
A
 = +25癈
Tx CARRIER LEAKAGE vs. GAIN SETTING
Tx GAIN CODE
60
50
10
20
30
40
-60
-55
-50
-45
-40
-35
-30
-25
-65
0
70
T
A
 = +85癈
T
A
 = -20癈
T
A
 = +25癈
Tx UNWANTED SIDEBAND
vs. RF FREQUENCY
RF FREQUENCY (MHz)
-60
-55
-50
-45
-40
-35
-65
T
A
 = -20癈
T
A
 = +25癈
T
A
 = +85癈
Tx UNWANTED SIDEBAND
vs. GAIN SETTING
Tx GAIN CODE
60
50
40
30
20
10
-45
-40
-35
-30
-25
-50
0
70
T
A
 = +85癈
T
A
 = +25癈
T
A
 = -20癈
RF FREQUENCY (GHz)
2.65GHz/div
0dBm
OUTPUT
POWER
(dBm/MHz)
-100dBm
0
26.5
Tx OUTPUT EMISSION SPECTRUM AT
MAX GAIN AND COLD
(100mV
RMS
 802.11a 54Mbps SIGNAL)
LO
2 x LO
3 x LO
4 x LO
5 x LO
Tx CHANNEL ISOLATION
RF FREQUENCY (MHz)
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-80
TX1 TO 4
TX2 TO 4
TX4 TO 3
TX3 TO 4
TX1 TO 2
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