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