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GPS/GNSS Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2686/MAX2688 EV kit, V CC = 1.6V to 3.3V, T A = -40 N C to +85 N C, f RFIN = 1575.42MHz. Typical values are at V CC = 2.85V and
T A = +25 N C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Return Loss
Reverse Isolation
15
40
dB
dB
Note 2: Min and max limits guaranteed by test at T A = +25°C and guaranteed by design and characterization at T A = -40°C and
T A = +85°C, unless otherwise noted.
Note 3: Min and max limits guaranteed by test at T A = +25°C.
Note 4: Min limit guaranteed by design and characterization.
Note 5: Measured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -27dBm/tone for the
MAX2686 and -24dBm/tone for the MAX2688.
Note 6: Measured with input tones at 1713MHz (-27dBm) and 1851MHz (-39dBm).
Note 7: Measured with a tone located at 5MHz offset from the center of the GPS band.
Typical Operating Characteristics
(MAX2686/MAX2688 EV kit. Typical values are at V CC = 2.85V, T A = +25°C, and f RFIN = 1575.42MHz, unless otherwise noted.)
INPUT RETURN LOSS vs. FREQUENCY
GAIN vs. FREQUENCY
REVERSE ISOLATION vs. FREQUENCY
0
-5
-10
-15
MAX2686
MAX2688
25
20
15
MAX2686
-20
-25
-30
-35
-40
MAX2686
-20
10
-45
-25
-30
-35
-40
5
0
-5
MAX2688
-50
-55
-60
-65
-70
MAX2688
500
1000
1500
2000
2500
500
1000
1500
2000
2500
500
1000
1500
2000
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
0
-5
OUTPUT RETURN LOSS vs. FREQUENCY
MAX2686 IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE)
0
-1
-10
-2
T A = -40°C
T A = +25°C
-15
-3
-20
-25
MAX2686
-4
-30
-35
MAX2688
-5
-6
T A = +85°C
500
1000
1500
2000
2500
1.6 1.8
2.0 2.2
2.4 2.6
2.8 3.0
3.2
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
3
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