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Low-Voltage IF Transceiver
with Limiter and RSSI
____________________________Typical Operating Characteristics (continued)
(MAX2511 test fixture, V CC = +3.0V, 0.01μF across CZ and CZ , MIXOUT tied to VREF through 165 ? resistor, TXIN, TXIN tied to
VREF through 50 ? resistor, TXOUT and TXOUT loaded with 100 ? differential, GC open, LIMOUT, LIMOUT loaded with 2k ? differ-
ential, TANK and TANK driven with -2.5dBm from a 100 ? source; OSCOUT AC-terminated with 50 ? , 100pF at RSSI pin, 0.1μF at
VREF pin, Rx inputs and Tx outputs differentially coupled, P RXIN, RXIN = -28dBm (200 ? system), f RXIN, RXIN = 425MHz, f LO = 435.7MHz,
f TXIN, TXIN = 10.7MHz, T A = +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT POWER
vs. GC VOLTAGE (FREQUENCY)
TRANSMITTER DIFFERENTIAL
OUTPUT IMPEDANCE vs. FREQUENCY
UPCONVERTER IM3 LEVELS vs.
GC VOLTAGE (POWERS ARE PER TONE)
5
0
-5
-10
-15
-20
100
0
-100
-200
-300
Tx MODE REAL
Tx OFF REAL
-20
-30
-40
-50
-25
-30
-35
-40
-45
-50
-55
205MHz
260MHz
350MHz
430MHz
-400
-500
-600
-700
-800
Tx OFF
IMAGINARY
Tx MODE
IMAGINARY
-60
-70
-80
-90
-60
-65
0
0.4
0.8
1.2
1.6
2.0
2.4
2.7
-900
-1000
200
300
400
500
-100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
0
GC VOLTAGE (V)
TRANSMITTER OUTPUT POWER
vs. TEMPERATURE, SUPPLY,
AND GC VOLTAGE
-0.5
FREQUENCY (MHz)
TRANSMITTER OUTPUT POWER
vs. TEMPERATURE AND SUPPLY
GC VOLTAGE (GC = 2V)
35
GC VOLTAGE (V)
UPCONVERTER IMAGE REJECTION
vs. IF FREQUENCY
-5
-10
V GC = 2V
V CC = 2.7V
V CC = 5.5V
-1.0
-1.5
V CC = 2.7V
30
-15
-2.0
25
-20
-25
-30
-35
-40
-45
V GC = OPEN
V GC = 0.5V
V CC = 2.7V
V CC = 5.5V
V CC = 5.5V
V CC = 2.7V
-2.5
-3.0
-3.5
-4.0
-4.5
V CC = 5.5V
20
15
10
-50
-5.0
5
-40
-20
0
20
40
60
85
-40
-20
0
20
40
60
85
0
10.7
20
30
40
50
TEMPERATURE (°C)
TEMPERATURE (°C)
IF FREQUENCY (MHz)
_______________________________________________________________________________________
7
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