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.
Applications
Direct Conversion Receiver (DCR)
Very Low IF Receiver
Features
Low Noise Figure (1.8dB typical)
High Small-Signal Gain (15dB Nominal)
Wide Frequency Range of Operation
(100MHz to 1GHz)
20dB Step Attenuator
45dB AGC Range Excluding Step Attenuator
2.65V to 3.3V Single-Supply Operation
Shutdown Mode
3.5mA Supply Current, Adjustable Down to 2.5mA
40dB Reverse Isolation
M
LNAs with Step Attenuator and VGA
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Ordering Information
19-2301; Rev 1; 10/06
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX2371
EGC
MAX2371ETC
MAX2371ETC+ -40°C to +85°C
MAX2373
EGC
MAX2373ETC
MAX2373ETC+ -40°C to +85°C
-40°C to +85°C
-40°C to +85°C
12 QFN-EP*
12 TQFN-EP*
12 TQFN-EP*
12 QFN-EP*
12 TQFN-EP*
12 TQFN-EP*
G1233-1
T1233-3
T1233+3
G1233-1
T1233-3
T1233+3
-40°C to +85°C
-40°C to +85°C
TOP VIEW
12
GND
11
RF_V
CC
10
RSET
4
5
AGC
6
LNA_I
1
2
LNA_E
3
9
8
7
RX_EN
AGC_BYP
LNA_V
CC
LNA_OUT
MAX2371
MAX2373
LNA_IN
RF_ATTN
QFN/TQFN
Pin Configuration
AGC
RF_V
CC
GND
LNA_OUT
LNA_IN
AGC_BYP
EXPONENTIAL
CONVERTER
AGC
AMP
LNA
RF_ATTN
RF
ATTENUATOR
LNA_V
CC
LNA_I
RX_EN
LNA_E
RSET
MAX2371
MAX2373
Functional Diagram
*
EP = Exposed pad.
+
Denotes lead-free package.