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