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MAX2371 Datasheet

  • MAX2371

  • LNAs with Step Attenuator and VGA

  • Maxim   Maxim

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19-2301; Rev 0A; 6/02
KIT
ATION
EVALU
BLE
AVAILA
LNAs with Step Attenuator and VGA
Features
o
Low Noise Figure (1.8dB typical)
o
High Small-Signal Gain (15dB Nominal)
o
Wide Frequency Range of Operation
(100MHz to 1GHz)
o
20dB Step Attenuator
o
45dB AGC Range Excluding Step Attenuator
o
2.65V to 3.3V Single-Supply Operation
o
Shutdown Mode
o
3.5mA Supply Current, Adjustable Down to 2.5mA
o
40dB Reverse Isolation
General Description
The MAX2371/MAX2373 wideband low-noise amplifier
(LNA) ICs are designed for direct conversion receiver
(DCR) or very low intermediate frequency (VLIF) receiver
applications. They contain single-channel, single-ended
LNAs with switchable attenuator and automatic gain con-
trol (AGC) intended as a low-noise gain stage. These
devices provide high gain-control range (typically 60dB)
at radio frequency (RF) with excellent noise and reverse
isolation characteristics.
The MAX2371/MAX2373 can work over the frequency
range from 100MHz to 1GHz. In practice, only a narrow
band is needed in each application, so different matching
circuits can be applied. The devices are dynamically con-
figured through the digital/analog control pins to select
either maximum gain and low noise figure or power-saving
mode. In addition, the MAX2371/MAX2373 feature
high/low-current modes, high/low attenuation modes, lin-
early controlled gain states, and shutdown mode.
MAX2371/MAX2373
Applications
Direct Conversion Receiver (DCR)
Very Low IF Receiver
PART
MAX2371EGC
MAX2373EGC
Ordering Information
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
12 QFN
12 QFN
Pin Configuration
GND
RSET
TOP VIEW
RF_V
CC
GND
Functional Diagram
RF_V
CC
RSET
12
LNA_IN
LNA_E
RX_EN
1
2
3
11
10
9
AGC_BYP
LNA_V
CC
LNA_OUT
AGC_BYP
LNA_IN
MAX2371
MAX2373
LNA_V
CC
MAX2371
MAX2373
8
7
LNA_E
RF
ATTENUATOR
LNA
AGC
AMP
LNA_OUT
RX_EN
EXPONENTIAL
CONVERTER
4
RF_ATTN
5
AGC
6
LNA_I
RF_ATTN
AGC
LNA_I
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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