5GHz, 4-Channel MIMO Transmitter
10 _____________________________________________________________________________________
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.)
Rx EMISSION SPECTRUM AT
LNA INPUT (LNA = MAX GAIN)
2.65GHz/div
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
-110
0
26.5
2LO
4LO
Rx INPUT RETURN LOSS
FRE EN Y MHz
5700
5500
5300
5100
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
-20
4900
5900
LNA = MAX
LNA = MAX - 32dB
LNA = MAX - 40dB
Rx RF RSSI OUTPUTo
RF INPUT POWER (dBm)
-5
-10
-15
-20
-25
-30
-35
-40
-45
0.5
1.0
1.5
2.0
2.5
0
-50
0
LOW GAIN,
T
A
= -20癈
LOW GAIN,
T
A
= +25癈
HIGH GAIN,
T
A
= +25癈
HIGH GAIN,
T
A
= +85癈
LOW GAIN, T
A
= +85癈
HIGH GAIN, T
A
= -20癈
Rx RF RSSI ATTACK TIME
(+40dB SIGNAL STEP)
MAX2850 toc14
1.0V/div
1.0V/div
0V
0V
400ns/div
D: 280ns
@: 192ns
D: 1.32V
@: 1.84V
GAIN CONTROL
V
RSSI
Rx RF RSSI DELAY TIME
(-40dB SIGNAL STEP)
MAX2850 toc15
1.0V/div
1.0V/div
0V
0V
400ns/div
D: 216ns
@: 128ns
D: 1.30V
@: 460mV
GAIN CONTROL
V
RSSI
BASEBAND RSSI VOLTAGE
vs. INPUT POWER
RF INPUT POWER (dBm)
0
-20
-40
-60
-80
0.5
1.0
1.5
2.0
2.5
3.0
0
-100
20
LNA = MAX - 16dB
LNA = MAX - 8dB
LNA = MAX - 32dB
LNA =
MAX - 24dB
LNA = MAX
LNA = MAX - 40dB
Rx BASEBAND RSSI
+40dB STEP RESPONSE
MAX2850 toc17
2.7V
0.8V
0V
2.4V
1祍/div
D: 460ns
@: 440ns
D: 1.50V
@: 2.30V
LNA GAIN CONTROL
RSSI OUTPUT
Rx BASEBAND RSSI
-32dB STEP RESPONSE
MAX2850 toc18
2.7V
0.6V
0V
2.0V
1祍/div
D: 1.18祍
@: 1.16祍
D: 1.62V
@: 480mV
LNA GAIN CONTROL
RSSI OUTPUT
Rx INPUT IMPEDANCE
MAX2850 toc11
RF FRE EN Y Hz
5.80
5.60
5.40
5.20
5.00
-10
0
10
20
30
40
-20
-30
-10
-20
0
10
20
-40
4.80
6.00
MAX - 32dB
MAX - 40dB
MAX - 32dB
MAX - 40dB
MAX GAIN
MAX GAIN
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