Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
____________________________ Typical Operating Characteristics (continued)
(MAX2510 EV kit; V CC = +3.0V; 0.01μF across CZ and CZ ; MIXOUT tied to VREF through 165 ? resistor; TXOUT and TXOUT loaded
with 100 ? differential; LO terminated with 50 ? ; LO AC grounded; GC open; LIMOUT, LIMOUT open; 330pF at RSSI pin; 0.1μF con-
nected from VREF pin to GND; P RXIN, RXIN = -30dBm differentially driven (input matched); f RXIN, RXIN = 240MHz; bias voltage at I, I ,
Q, Q = 1.4V; V I,Q = 500mVp-p; f I, Q = 200kHz; f LO, LO = 230MHz; P LO = -13dBm; T A = +25°C; unless otherwise noted.)
DOWNCONVERTER MIXER CONVERSION
1.2
1.0
0.8
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
25
24
23
GAIN vs. SUPPLY VOLTAGE
AND TEMPERATURE
T A = -40° C
25
20
DOWNCONVERTER MIXER CONVERSION
GAIN vs. RXIN FREQUENCY
T A = +85 ° C
22
T A = +85°C
15
0.6
T A = -40 ° C
21
T A = +25°C
10
0.4
20
0.2
T A = +25°C
19
5
MISMATCH LOSS
COMPENSATED
0
18
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0 100 200 300 400 500 600 700 800 900 1000
SUPPLY VOLTAGE (V)
RECEIVE MIXER INPUT 1dB
COMPRESSION POINT vs. SUPPLY VOLTAGE
-12
VOLTAGE (V)
500
RF FREQUENCY (MHz)
RXIN INPUT IMPEDANCE
vs. FREQUENCY
-13
450
SINGLE-ENDED
-14
-15
-16
-17
T A = +85°C
T A = +25°C
400
350
300
250
-18
200
IMAGINARY
-19
T A = -40 ° C
150
-20
-21
-22
100
50
0
REAL
2.5
3.0
3.5
4.0
4.5
5.0
5.5
30
90
150 210 270 330 390 450 510
SUPPLY VOLTAGE (V)
FREQENCY (MHz)
_______________________________________________________________________________________
5
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