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Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2685 EV kit, V CC = V SHDN = +3V, f LNAIN = f MIXIN = 880MHz, f LO = 960MHz, P LNAIN = -30dBm, P LO = -8dBm, P MIXIN = -25dBm,
differential IFOUT operation, Z o = 50 ? , T A = +25°C, unless otherwise noted.)
PARAMETER
Mixer Conversion Gain Variation over
Temperature
Mixer Noise Figure (SSB)
Mixer Input IP3 (Note 6)
CONDITIONS
GAIN = V CC , T A = T MIN to T MAX (Note 3)
GAIN = V CC
GAIN = GND
GAIN = V CC
GAIN = GND
MIN
TYP
1
13
12.1
7
-1.5
MAX
2
UNITS
dB
dB
dBm
LO Port Return Loss
11
dB
LO-to-LNAIN Isolation
LO-to-MIXIN Isolation
LNAOUT-to-MIXIN Isolation
SHDN = V CC or GND
53
31
28
dB
dB
dB
OVERALL SYSTEM
Receiver Enable Time
(Note 7)
0.8
μs
Note 1: Performance at temperatures greater than or equal to +25°C are guaranteed by production test; performance at tempera-
tures less than +25°C are guaranteed by design and characterization.
Note 2: This is the recommended operating frequency range.
Note 3: Maximum and minimum limits are guaranteed by design and device characterization and are not production tested.
Note 4: Two tones at 880MHz and 880.1MHz, -30dBm per tone.
Note 5: Two tones at 880MHz and 880.1MHz, -10dBm per tone.
Note 6: Two tones at 880MHz and 880.1MHz, -25dBm per tone.
Note 7: Time from SHDN = high, until the cascaded receive gain is within 1dB of its final value. Measured with 47pF blocking
capacitors on LNAIN and LNAOUT. Matching network removed from IFOUT output.
Typical Operating Characteristics
(MAX2685 EV kit, V CC = V SHDN = +3V, f LNAIN = f MIXIN = 880MHz, f LO = 960MHz, P LNAIN = -30dBm, P LO = -8dBm, P MIXIN = -25dBm,
differential IFOUT operation, Z o = 50 ? , T A = +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
SUPPLY CURRENT vs. SUPPLY VOLTAGE
vs. SUPPLY VOLTAGE
LNA GAIN vs. SUPPLY VOLTAGE
10
9
8
7
6
T A = +85°C
T A = +25°C
GAIN = HIGH
T A = -40°C
10
9
8
7
6
SHDN = GND
T A = +85°C
20
15
10
5
GAIN = HIGH
T A = +25°C
T A = -40 °C
T A = +85°C
5
T A = +85°C
5
4
3
2
1
GAIN = LOW
T A = +25°C
T A = -40°C
4
3
2
1
T A = +25°C
0
-5
-10
T A = +25°C T A = -40 °C
GAIN = LOW T A = +85°C
0
0
T A = -40°C
-15
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
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
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