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Low-Voltage IF Transceiver
with Limiter and RSSI
__________________________________________Typical Operating Characteristics
(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 ? differential,
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.)
40
SUPPLY CURRENT
vs. TEMPERATURE
40
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
50
SUPPLY CURRENT
vs. GC VOLTAGE
35
Tx MODE
35
Tx MODE
45
30
30
25
Rx MODE
25
Rx MODE
40
Tx MODE
20
15
10
20
15
10
35
30
5
STANDBY MODE
5
STANDBY MODE
25
Rx MODE
0
0
20
-40
25
85
2.7 3.0
3.5
4.0
4.5
5.0
5.5
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
TEMPERATURE (°C)
V CC (V)
GC VOLTAGE (V)
2.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
25
DOWNCONVERTER MIXER CONVERSION
GAIN vs. SUPPLY VOLTAGE
25.0
DOWNCONVERTER GAIN
vs. RXIN FREQUENCY
RXEN = HIGH
2.0
24
T A = -40°C
24.5
TXEN = LOW
1.5
T A = +85°C
23
T A = +25°C
24.0
1.0
22
21
T A = +85°C
23.5
23.0
0.5
0
2.7 3.0
T A = +25°C
T A = -40°C
3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
20
19
2.7 3.0
3.5
4.0
V CC (V)
4.5
RXEN = HIGH
TXEN = LOW
5.0
5.5
22.5
22.0
200
275 350
RXIN FREQUENCY (MHz)
425
_______________________________________________________________________________________
5
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