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5GHz, 5-Channel MIMO Receiver
Typical Operating Characteristics (continued)
(V CC = 2.8V, T A = +25 N C, f LO = 5.35GHz, f REF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50ω unbalanced
output of balun, using the MAX2851 Evaluation Kit, unless otherwise noted.)
LNA = MAX - 40dB
1.0V/div
0V
1.0V/div
0V
Rx RF RSSI DELAY TIME
(-40dB SIGNAL STEP)
MAX2851 toc19
D : 216ns D : 1.30V
@: 128ns @: 460mV
GAIN CONTROL
V RSSI
3.0
2.5
2.0
1.5
1.0
BASEBAND RSSI VOLTAGE
vs. INPUT POWER
LNA = MAX
LNA = MAX - 8dB
LNA =
MAX - 24dB
LNA = MAX - 32dB
2.7V
0V
2.4V
0.8V
Rx BASEBAND RSSI
+40dB STEP RESPONSE
MAX2851 toc21
D : 460ns D : 1.50V
@: 440ns @: 2.30V
LNA GAIN CONTROL
RSSI OUTPUT
0.5
LNA = MAX - 16dB
400ns/div
0
-100
-80
-60
-40
-20
0
20
1μs/div
RF INPUT POWER (dBm)
Rx BASEBAND RSSI
-32dB STEP RESPONSE
MAX2851 toc22
D : 1.18μs D : 1.62V
-35
Rx LPF 20MHz CHANNEL BANDWIDTH
RESPONSE
-35
Rx LPF 40MHz CHANNEL BANDWIDTH
RESPONSE
@: 1.16μs @: 480mV
2.7V
0V
2.0V
0.6V
LNA GAIN CONTROL
RSSI OUTPUT
1μs/div
-135
10k
100M
-135
10k
100M
BASEBAND FREQUENCY (Hz)
FREQUENCY (Hz)
100
Rx LPF 20MHz CHANNEL
BANDWIDTH GROUP DELAY
MAX2851 toc25
100
Rx LPF 40MHz CHANNEL
BANDWIDTH GROUP DELAY
MAX2851 toc26
Rx DC OFFSET SETTLING RESPONSE
(-30dB Rx VGA GAIN STEP)
MAX2851 toc27
0V
Rx BASEBAND
I/Q OUTPUT
50mV/div
GAIN-CONTROL
TOGGLE
CH1 PEAK TO
PEAK: 81.9mV
0
0
10k
100M
10k
FREQUENCY (Hz)
100M
200ns/div
FREQUENCY (Hz)
12
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