5GHz, 4-Channel MIMO Transmitter
14 _____________________________________________________________________________________
  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.)
SINGLE Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGEo
SUPPLY VOLTAGE (V)
3.5
3.4
3.2
3.3
2.8
2.9
3.0
3.1
2.7
187
188
189
190
191
192
193
194
195
196
186
2.6
3.6
T
A
 = -20癈
T
A
 = +25 AND +85癈
QUAD Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGEo
SUPPLY VOLTAGE (V)
500
505
510
515
520
525
495
3.5
3.4
3.2  3.3
2.8  2.9  3.0  3.1
2.7
2.6
3.6
T
A
 = -20癈
T
A
 = +85癈
T
A
 = +25癈
Tx BASEBAND RESPONSEo
BASEBAND FREQUENCY (Hz)
1.00E+07
-80
-60
-40
-20
0
20
-100
1.00E+06
1.00E+08
RFBW = 40MHz
RFBW = 20MHz
TX2 OUTPUT RETURN LOSS
vs. FREQUENCY
FREQUENCY (MHz)
5700
5500
5300
5100
-16
-14
-12
-10
-8
-6
-4
-2
0
-18
4900
5900
T
A
 = -20癈
T
A
 = +85癈
T
A
 = +25癈
OUTPUT RETURN LOSS AT
T
A
 = +25癈 vs. Tx CHANNELS
FREQUENCY (MHz)
-20
-15
-10
-5
0
-25
TX4
TX2
TX1
TX3
RF FREQUENCY (MHz)
-5
-4
-3
-2
-1
0
1
-6
TX2 OUTPUT POWER AT MAXIMUM
GAIN vs. RF FREQUENCY
T
A
 = -20癈
T
A
 = +25癈
T
A
 = +85癈
Tx OUTPUT POWER vs. Tx CHANNELS
(GAIN = MAX - 3dB, 40MHz MODE,
100mV
RMS
 BB INPUT)
FREQUENCY (MHz)
-7
-6
-5
-4
-3
-2
-8
TX1
TX2
TX3
TX4
Tx OUTPUT POWER vs. GAIN SETTING
Tx GAIN CODE
60
50
10
20
30
40
-35
-30
-25
-20
-15
-10
-5
0
-40
0
70
T
A
 = -20癈
T
A
 = +25癈
T
A
 = +85癈
Tx GAIN STEP vs. GAIN SETTING
Tx GAIN CODE
60
50
40
30
20
10
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.8
0
70
T
A
 = +85癈
T
A
 = -20癈
T
A
 = +25癈
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