MAX2371 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – LNAs with Step Attenuator and VGA

19-2301; Rev 1; 10/06
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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.
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
Ordering Information
PART
TEMP RANGE
MAX2371EGC -40°C to +85°C
MAX2371ETC -40°C to +85°C
MAX2371ETC+ -40°C to +85°C
MAX2373EGC -40°C to +85°C
MAX2373ETC -40°C to +85°C
MAX2373ETC+ -40°C to +85°C
*EP = Exposed pad.
+Denotes lead-free package.
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
Pin Configuration
Functional Diagram
TOP VIEW
GND RF_V_CC RSET
12 11 10
LNA_IN 1
LNA_E 2
RX_EN 3
MAX2371
MAX2373
9 AGC_BYP
8 LNA_V_CC
7 LNA_OUT
4
5
6
RF_ATTN AGC LNA_I
QFN/TQFN
LNA_IN
LNA_E
RX_EN
GND
RF_VCC
RSET
RF
ATTENUATOR
MAX2371
MAX2373
LNA
AGC
AMP
EXPONENTIAL
CONVERTER
RF_ATTN
AGC
LNA_I
AGC_BYP
LNA_VCC
LNA_OUT
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