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2.4GHz 802.11b Zero-IF Transceivers
Typical Operating Characteristics (continued)
(MAX2820/MAX2821 EV kit, V CC = +2.7V, f BB = 1MHz, f LO = 2450MHz, receive baseband outputs = 500mV P-P , transmit base-
band inputs = 400mV P-P , I CP = +2mA, BW PLL = 45kHz, differential RF input/output matched to 50 ? through a balun, baseband
input biased at +1.2V, registers set to default power-up settings, T A = +25 ° C, unless otherwise noted.)
TRANSMITTER OUTPUT POWER
0
RECEIVER BASEBAND OUTPUT SPECTRUM
V RF_GAIN = V IH
4.0
vs. FREQUENCY
-10
-20
RX GAIN = 50dB
f BB = 5MHz
f LO = 2450MHz
3.5
3.0
-40 ° C
("A" VERSION)
-30
-40
-50
-60
-70
2.5
2.0
1.5
1.0
0.5
-40 ° C
+25 ° C
+85 ° C
+25 ° C
("A" VERSION)
+85 ° C
("A" VERSION)
V IN = 400mV P-P
V TX_GC = 0V
11Mbps CCK
-80
0
0
5
10 15 20 25 30 35 40 45 50
2400
2420
2440
2460
2480
2500
4.0
FREQUENCY (MHz)
TRANSMITTER OUTPUT POWER
vs. SUPPLY VOLTAGE
-10
FREQUENCY (MHz)
TRANSMITTER OUTPUT SPECTRUM
RBW = 100kHz
3.5
3.0
2.5
-40 ° C
-40 ° C ("A" VERSION)
+25 ° C ("A" VERSION)
-20
-30
-40
V IN = 400mV P-P
11Mbps CCK
P OUT = -1dBm
2.0
1.5
1.0
0.5
+25 ° C
+85 ° C
+85 ° C ("A" VERSION)
V IN = 400mV P-P
V TX_GC = 0V
-50
-60
-70
-80
11Mbps CCK
0
-90
2.7
3.0
3.3
3.6
-33
-22
-11
0
11
22
33
10
V CC (V)
TRANSMITTER OUTPUT SPECTRUM
5
FREQUENCY OFFSET FROM CARRIER (MHz)
TRANSMITTER GAIN
vs. GAIN-CONTROL VOLTAGE
0
-10
-20
CW SIGNAL
f BB = 3.3MHz
f LO = 2450MHz
0
-5
-10
+25 ° C +85 ° C
-40 ° C
-30
-40
-50
-60
-70
-80
-15
-20
-25
-30
-35
-40 ° C ("A" VERSION)
+25 ° C ("A" VERSION)
+85 ° C ("A" VERSION)
0dB = MAX P OUT AT +25 ° C
V IN = 400mV P-P
11Mbps CCK
0 0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0
0
0.5
1.0
1.5
2.0
FREQUENCY (GHz)
V TX_GC (V)
_______________________________________________________________________________________
9
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