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5GHz Receiver
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 50 I unbalanced output of
balun, T A = +25 N C, using the MAX2852 Evaluation Kit.)
-10
-20
Rx EMISSION SPECTRUM AT
LNA INPUT (LNA = MAX GAIN)
40
Rx INPUT IMPEDANCE
MAX - 32dB MAX GAIN
MAX2852 toc11
20
0
-2
Rx INPUT RETURN LOSS
-30
30
10
-4
-40
-50
-60
-70
2LO
4LO
20
10
MAX GAIN
MAX - 40dB
MAX - 32dB
0
-10
-6
-8
-10
-12
LNA = MAX - 32dB
LNA = MAX
-80
0
-20
-14
-90
-10
MAX - 40dB
-30
-16
LNA = MAX - 40dB
-100
-18
-110
0
2.65GHz/div
26.5
-20
4.80
5.00
5.20
5.40
5.60
5.80
-40
6.00
-20
4900
5100
5300
5500
5700
5900
RF FREQUENCY (GHz)
FREQUENCY (MHz)
2.5
2.0
Rx RF RSSI OUTPUT
LOW GAIN, T A = +85°C
LOW GAIN,
T A = +25°C
1.0V/div
Rx RF RSSI ATTACK TIME
(+40dB SIGNAL STEP)
MAX2852 toc14
D : 280ns D : 1.32V
@: 192ns @: 1.84V
1.0V/div
Rx RF RSSI DELAY TIME
(-40dB SIGNAL STEP)
MAX2852 toc15
D : 216ns D : 1.30V
@: 128ns @: 460mV
1.5
1.0
0.5
LOW GAIN,
T A = -20°C
HIGH GAIN,
T A = +85°C
HIGH GAIN,
T A = +25°C
0V
1.0V/div
0V
GAIN CONTROL
V RSSI
0V
1.0V/div
0V
GAIN CONTROL
V RSSI
HIGH GAIN, T A = -20°C
0
-50 -45 -40 -35 -30 -25 -20 -15 -10 -5
0
400ns/div
400ns/div
RF INPUT POWER (dBm)
LNA = MAX - 40dB
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
MAX2852 toc17
D : 460ns D : 1.50V
@: 440ns @: 2.30V
LNA GAIN CONTROL
RSSI OUTPUT
2.7V
0V
2.0V
0.6V
Rx BASEBAND RSSI
-32dB STEP RESPONSE
MAX2852 toc18
D : 1.18μs D : 1.62V
@: 1.16μs @: 480mV
LNA GAIN CONTROL
RSSI OUTPUT
0.5
0
LNA = MAX - 16dB
-100
-80
-60
-40
-20
0
20
1μs/div
1μs/div
RF INPUT POWER (dBm)
10
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