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900MHz SiGe, High IP3,
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS
(MAX2642/MAX2643 EV kits, P RFIN = -30dBm, f RFIN = 900MHz, input and output are terminated to 50 ? , V CC = +3.0V, T A = +25 ° C,
R BIAS = 510 ? , unless otherwise noted.) (Note 12)
PARAMETER
Operating Frequency Range
Gain (Note 14)
Gain Variation Over Temperature
Attenuation Step
Input Third-Order Intercept Point
(Note 15)
Input 1dB Compression Point
Noise Figure (Note 16)
Input Return Loss
Output Return Loss
Reverse Isolation
Gain-Step Response Time
Shutdown Response Time
CONDITIONS
(Note 13)
T A = +25 ° C
T A = -40 ° C to +85 ° C
MAX2642 only
R BIAS = 510 ?
R BIAS = 806 ?
R BIAS = 1.1k ?
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642
MAX2643
MAX2642, through series switch at BIAS
MIN
800
14.5
-10
-10
-10
-10
-20
-10
TYP
16.7
± 0.35
13
0
-5
-10
-18
-17
1.35
4.3
-12
-18
-14
-11
-26
-17
5
6
12
MAX
1000
19
± 0.75
1.6
10
10
UNITS
MHz
dB
dB
dB
dBm
dBm
dB
dB
dB
dB
μ s
μ s
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
Note 16:
Devices are production tested at T A = +25 ° C. Minimum and maximum values are guaranteed by design and characterization
over temperature and supply voltage.
High-gain mode is set for the MAX2642 by connecting RFOUT to GND through a 33k ? resistor.
Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to V CC through a 33k ? resistor.
Maximum DC voltage through a 33k ? resistor that sets the MAX2642 to operate in high-gain mode.
Minimum DC voltage through a 33k ? resistor that sets the MAX2642 to operate in low-gain mode.
DC current required when RFOUT is connected to GND through a 33k ? resistor (MAX2642) and 10k ? resistor (MAX2643).
DC current required when RFOUT is connected to V CC through a 33k ? resistor (MAX2642) and 10k ? resistor (MAX2643).
Normal operation is set for the MAX2643 by connecting RFOUT to V CC through a 10k ? resistor.
Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10k ? resistor.
Minimum DC voltage through a 10k ? resistor that sets the MAX2643 to operate in normal mode.
Maximum DC voltage through a 10k ? resistor that sets the MAX2643 to operate in shutdown mode.
Min/Max limits are guaranteed by design and characterization, except gain is production tested at T A = +25 ° C.
The part has been characterized at the specified frequency range. Operation outside this range is possible but not guar-
anteed.
Devices are production tested at T A = +25 ° C.
Measured with two input tones, f 1 = 895MHz and f 2 = 905MHz, both at -30dBm per tone.
Excludes PC board losses (0.25dB typical at the input of the MAX2642/MAX2643 EV kit).
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