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2.3GHz to 2.7GHz MIMO Wireless Broadband
RF Transceiver
Typical Operating Characteristics (continued)
(V CC = 2.8V, T A = +25°C, f LO = 2.5GHz, f REF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 10MHz, Tx output at 50 Ω
unbalanced output of balun, using the MAX2839 Evalutation Kit.)
RX A INPUT DIFFERENTIAL IMPEDANCE
vs. FREQUENCY
RX B INPUT DIFFERENTIAL IMPEDANCE
vs. FREQUENCY
35.40
MAX2839 toc13
-69.0
34.80
MAX2839 toc14
-66.0
34.70
-68.0
35.10
34.80
IMAGINARY
-73.0
-77.0
34.60
34.50
34.40
IMAGINARY
-70.0
-72.0
-74.0
34.30
-76.0
34.50
-81.0
34.20
34.10
-78.0
-80.0
34.20
33.90
REAL
-85.0
-89.0
34.00
33.90
33.80
REAL
-82.0
-84.0
-86.0
2.3
2,4
2.5
2.6
2.7
2.3
2.4
2.5
2.6
2.7
0
FREQUENCY (GHz)
RX INPUT RETURN LOSS vs. FREQUENCY
2.5
FREQUENCY (GHz)
RSSI VOLTAGE vs. INPUT POWER
-10
-20
-30
-40
LNA = MAX - 32dB
LNA = MAX - 8dB
LNA = MAX - 16dB
2.0
1.5
LNA = MAX
LNA = MAX - 8dB
1.0
-50
-60
-70
LNA = MAX
0.5
LNA = MAX - 16dB
LNA = MAX - 32dB
2300
2400
2500 2600
2700
0
FREQUENCY (MHz)
-110
-80
-50
-20
10
P IN (dBm)
3V
0V
1.45V
0.45V
RX RSSI STEP RESPONSE
(+32dB SIGNAL STEP)
MAX2839 toc17
LNA GAIN CONTROL
RSSI OUTPUT
200ns/div
3V
0V
1.45V
0.45V
RX RSSI STEP RESPONSE
(-32dB SIGNAL STEP)
MAX2839 toc18
LNA GAIN
CONTROL
RSSI
200ns/div
12
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