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2.4GHz 802.11b Zero-IF Transceivers
Typical Operating Characteristics
(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.)
RECEIVER VOLTAGE GAIN
100
SUPPLY CURRENT vs. TEMPERATURE
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
120
vs. GAIN-CONTROL VOLTAGE
90
80
RECEIVE, V RF_GAIN = V IH
90
80
RECEIVE, V RF_GAIN = V IH
100
V RF_GAIN = V IH
V RF_GAIN = V IH ,
70
60
50
TRANSMIT
RECEIVE, V RF_GAIN = V IL
70
60
50
TRANSMIT
RECEIVE, V RF_GAIN = V IL
80
60
("A" VERSION)
V RF_GAIN = V IL ,
("A" VERSION)
40
30
40
30
40
V RF_GAIN = V IL
20
10
0
STANDBY
20
10
0
STANDBY
20
0
V OUT = 500mV P-P
f BB = 1MHz
f LO = 2450MHz
-40
-15
10
35
60
85
2.7
3.0
3.3
3.6
0
0.5
1.0
1.5
2.0
TEMPERATURE ( ° C)
RECEIVER VOLTAGE GAIN
vs. RF FREQUENCY
V CC (V)
RECEIVER NOISE FIGURE vs. GAIN
V RX_AGC (V)
RECEIVER DETECTOR HYSTERESIS
vs. INPUT POWER
40
35
30
25
20
f BB = 1MHz
V RF_GAIN = V IH , V RX_AGC = 2.0V
50
45
40
35
30
25
V RF_GAIN = V IL
MAX2820/MAX2821 ONLY
LOW
HIGH
HIGH-GAIN MODE
HIGH
15
20
10
5
V RF_GAIN = V IL , V RX_AGC = 2.0V
15
10
5
f BB = 1MHz
f LO = 2450MHz
V RF_GAIN = V IH
LOW
LOW-GAIN MODE
0
0
2400
2420
2440
2460
2480
2500
0
20
40
60
80
100
-65
-60
-55
-50
-45
-40
-35
10
RF FREQUENCY (MHz)
RECEIVER FILTER RESPONSE
(1kHz TO 1MHz)
10
RX GAIN (dB)
RECEIVER FILTER RESPONSE
(1MHz TO 100MHz)
-10
P IN (dBm)
RECEIVER LEAKAGE SPECTRUM
0
-10
0
-10
-20
-30
V RF_GAIN = V IH
f LO = 2400MHz
-20
-30
-40
-50
-60
-70
-80
-90
RX_1K = V IH
RX_1K = V IH ,
("A" VERSION)
RX_1K = V IL ,
(BOTH VERSIONS)
-20
-30
-40
-50
-60
-70
-80
-90
"A" VERSION
-40
-50
-60
-70
-80
-90
-100
-120
1
10
100
1000
1
10
100
0
0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0
FREQUENCY (kHz)
FREQUENCY (MHz)
FREQUENCY (GHz)
8
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