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Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
ABSOLUTE MAXIMUM RATINGS
V CC to GND ..............................................................-0.3V to +6V
LNAIN Input Power (50 ? source)...................................+10dBm
LO Input Power (50 ? source) ........................................+10dBm
MIXIN Input Power (50 ? source) ...................................+10dBm
IFOUT+, IFOUT- to GND ..........................................-0.3V to +6V
LNAOUT to GND ......................................................-0.3V to +6V
Continuous Power Dissipation (T A = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
GAIN, SHDN to GND..................................-0.3V to (V CC + 0.3V)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V CC = +2.7V to +5.5V, V SHDN = +2V, V GAIN = +2V, LNAIN = LNAOUT = MIXIN = LO = unconnected, IFOUT+ = IFOUT- = V CC , T A
= -40°C to +85°C. Typical values are at T A = +25°C and V CC = +3V, unless otherwise noted.)
PARAMETER
Supply Voltage Range
Operating Supply Current
Shutdown Supply Current
CONDITIONS
GAIN = V CC (Note 1)
GAIN = GND (Note 1)
SHDN = GND (Note 1)
MIN
2.7
TYP
8.5
3.8
0.1
MAX
5.5
14.1
6.4
1.0
UNITS
V
mA
μA
Logic Input Voltage High
Logic Input Voltage Low
GAIN, SHDN
GAIN, SHDN
2.0
0.5
V
V
Logic Input Current
V SHDN = V GAIN = 0 to 5.5V (Note 1)
±0.01
±1
μA
AC ELECTRICAL 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.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LOW-NOISE AMPLIFIER (LNA)
RF Frequency Range (Note 2)
800
1000
MHz
LNA Gain
LNA Gain Variation over Temperature
LNA Noise Figure
LNA Input IP3
LNA Input 1dB Compression
LNAOUT Port Return Loss
GAIN = V CC (Note 1)
GAIN = GND (Note 1)
GAIN = V CC , T A = T MIN to T MAX (Note 3)
GAIN = V CC
GAIN = GND
GAIN = V CC (Note 4)
GAIN = GND (Note 5)
GAIN = V CC
GAIN = V CC
GAIN = GND
13
-14
15
-12
0.9
1.4
12.2
-4.1
+16.2
-18.4
-18.6
-11.3
16.2
-10.3
1.6
dB
dB
dB
dBm
dBm
dB
DOWNCONVERTER MIXER
RF Frequency Range (Note 2)
800
1000
MHz
Mixer Conversion Gain
GAIN = V CC (Note 1)
GAIN = GND (Note 1)
4.7
2.5
6.1
4.6
7.0
6.0
dB
2
_______________________________________________________________________________________
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