19-2301; Rev 1; 10/06
KIT
ATION
EVALU
BLE
AVAILA
LNAs with Step Attenuator and VGA
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
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
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
12 QFN-EP*
12 TQFN-EP*
12 TQFN-EP*
12 QFN-EP*
12 TQFN-EP*
12 TQFN-EP*
PKG
CODE
G1233-1
T1233-3
T1233+3
G1233-1
T1233-3
T1233+3
Applications
Direct Conversion Receiver (DCR)
Very Low IF Receiver
MAX2371EGC
MAX2371ETC
MAX2373EGC
MAX2373ETC
MAX2371ETC+ -40°C to +85°C
MAX2373ETC+ -40°C to +85°C
*EP
= Exposed pad.
+Denotes
lead-free package.
Pin Configuration
TOP VIEW
GND
12
RF_V
CC
RSET
11
10
LNA_IN
GND
Functional Diagram
RF_V
CC
RSET
AGC_BYP
MAX2371
MAX2373
LNA_V
CC
LNA_IN
LNA_E
RX_EN
1
2
3
9
8
7
AGC_BYP
LNA_V
CC
LNA_OUT
LNA_E
RF
ATTENUATOR
LNA
AGC
AMP
LNA_OUT
MAX2371
MAX2373
RX_EN
EXPONENTIAL
CONVERTER
4
5
6
LNA_I
RF_ATTN
AGC
LNA_I
RF_ATTN AGC
QFN/TQFN
________________________________________________________________
Maxim Integrated Products
1
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
