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MAX2371EGC+MAXIMN/a5928avaiLNAs with Step Attenuator and VGA
MAX2371ETC+MAXIMN/a355avaiLNAs with Step Attenuator and VGA
MAX2373EGCMAXIMN/a15000avaiLNAs with Step Attenuator and VGA
MAX2373EGC+MAXIMN/a2550avaiLNAs with Step Attenuator and VGA
MAX2373EGC+TMAXIMN/a5000avaiLNAs with Step Attenuator and VGA
MAX2373ETCMAXIMN/a1800avaiLNAs with Step Attenuator and VGA
MAX2373ETC+ |MAX2373ETCMAXIMN/a1500avaiLNAs with Step Attenuator and VGA
MAX2373ETC+N/AN/a2500avaiLNAs with Step Attenuator and VGA


MAX2373EGC ,LNAs with Step Attenuator and VGAMAX2371/MAX237319-2301; Rev 1; 10/06LNAs with Step Attenuator and VGA
MAX2373EGC+ ,LNAs with Step Attenuator and VGAELECTRICAL CHARACTERISTICS(MAX2371/MAX2373 EV Kits, V = 2.65V to 3.3V, RX_EN = high, R = 1.1kΩ, T = ..
MAX2373EGC+T ,LNAs with Step Attenuator and VGAELECTRICAL CHARACTERISTICS(V = 2.775V, RX_EN = high, R = 1.1kΩ, V = V /2, T = -40°C to +85°C. Typic ..
MAX2373ETC ,LNAs with Step Attenuator and VGAApplicationsMAX2371EGC -40°C to +85°C 12 QFN-EP* G1233-1MAX2371ETC -40°C to +85°C 12 TQFN-EP* T1233 ..
MAX2373ETC+ ,LNAs with Step Attenuator and VGAapplications. They contain single-channel, single-ended♦ Wide Frequency Range of Operation LNAs wit ..
MAX2373ETC+ ,LNAs with Step Attenuator and VGAApplicationsMAX2371EGC -40°C to +85°C 12 QFN-EP* G1233-1MAX2371ETC -40°C to +85°C 12 TQFN-EP* T1233 ..
MAX5544CSA ,Low-Cost / +5V / Serial-Input / Voltage-Output / 14-Bit DACApplicationsOrdering InformationHigh-Resolution Offset and Gain AdjustmentPART TEMP. RANGE PIN-PACK ..
MAX5544ESA ,Low-Cost / +5V / Serial-Input / Voltage-Output / 14-Bit DACELECTRICAL CHARACTERISTICS(V = +5V ±5%, V = +2.5V, V = V = 0, T = T to T , unless otherwise noted. ..
MAX5550ETE ,Dual, 10-Bit, Programmable, 30mA High-Output-Current DACApplicationsM AX5550E TE 16 Thin Q FN- E P * T1633F-3 ACZPIN Diode Biasing *EP = Exposed paddle. ..
MAX5550ETE+ ,Dual, 10-Bit, Programmable, 30mA High-Output-Current DACELECTRICAL CHARACTERISTICS(V = +2.7V to +5.25V, GND = 0, V = +1.25V, internal reference, R = 20kΩ ; ..
MAX5556ESA ,Low-Cost Stereo Audio DACApplications● Digital Video Recorders and Media Servers● Set-Top Boxes● Video-Game HardwareTypical ..
MAX5556ESA+ ,Low-Cost Stereo Audio DACElectrical Characteristics(V = +4.75V to +5.5V, V = 0V, R _ = 10kΩ, C _ = 10pF, 0dBFS sine-wave sig ..

MAX2371EGC+-MAX2371ETC+-MAX2373EGC-MAX2373EGC+-MAX2373EGC+T-MAX2373ETC-MAX2373ETC+
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
FeaturesLow Noise Figure (1.8dB typical)High Small-Signal Gain (15dB Nominal)Wide Frequency Range of Operation
(100MHz to 1GHz)20dB Step Attenuator45dB AGC Range Excluding Step Attenuator2.65V to 3.3V Single-Supply OperationShutdown Mode3.5mA Supply Current, Adjustable Down to 2.5mA40dB Reverse Isolation
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
Ordering Information
19-2301; Rev 1; 10/06
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX2371EGC-40°C to +85°C12 QFN-EP*G1233-1
MAX2371ETC-40°C to +85°C12 TQFN-EP*T1233-3
MAX2371ETC+-40°C to +85°C12 TQFN-EP*T1233+3
MAX2373EGC-40°C to +85°C12 QFN-EP*G1233-1
MAX2373ETC-40°C to +85°C12 TQFN-EP*T1233-3
MAX2373ETC+-40°C to +85°C12 TQFN-EP*T1233+3
TOP VIEW
GND
RF_VCC
RSET
AGC
LNA_ILNA_ERX_EN
AGC_BYP
LNA_VCC
LNA_OUT
MAX2371
MAX2373
LNA_IN
RF_ATTN
QFN/TQFN
Pin Configuration
AGC
RF_VCCGND
LNA_OUT
LNA_IN
AGC_BYP
EXPONENTIAL
CONVERTER
AGC
AMPLNA
RF_ATTN
ATTENUATOR
LNA_VCC
LNA_I
RX_EN
LNA_E
RSET
MAX2371
MAX2373
Functional Diagram
*EP= Exposed pad.
+Denotes lead-free package.
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= 2.775V, RX_EN = high, RSET= 1.1kΩ, VAGC= VCC/2, TA= -40°C to +85°C. Typical values are at TA= +25°C, unless other-
wise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND...........................................................-0.3V to +3.6V
All Pins Excluding Grounds to Pin GND.....-0.3V to (VCC+ 0.3V)
LNA Input Power (RX_EN = low)........................................5dBm
Continuous Power Dissipation (TA= +70°C)
12-Pin QFN (derate 11.9mW/°C above +70°C)...........952mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Soldering Temperature (10s)...........................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply VoltageVCC2.652.7753.30V
RX_EN = low, VCC = 3.3V0.520µA
LNA_I = high, RF_ATTN = low3.55.5mASupply CurrentICC
LNA_I = low2.53.5mA
Digital Input Logic HighVIHPins LNA_I, RF_ATTN, RX_EN0.7 ✕ VCCVCCV
Digital Input Logic LowVILPins LNA_I, RF_ATTN, RX_EN00.3 ✕ VCCV
Logic Pin ImpedanceLogic pins RX_EN, RF_ATTN, LNA_I50kΩ
AGC Pin ImpedancePins AGC100kΩ
AC ELECTRICAL CHARACTERISTICS
(MAX2371/MAX2373 EV Kits, VCC= 2.65V to 3.3V, RX_EN = high, RSET= 1.1kΩ, TA= -40°C to +85°C. Typical values are at VCC=
2.775V; for MAX2371 fRF= 150MHz, for MAX2373 fRF= 850MHz to 940MHz; TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
LNA AND AGC AMP CHARACTERISTICS
Low band (MAX2371)136150174Radio Frequency Range (Note 2)High band (MAX2373)850900940MHz
MAX2371-12-9.5LNA_I = high;
RF_ATTN = lowMAX2373-15-9.5
MAX2371-14-10
Input Return Loss (S11)
(Note 3)LNA_I = high;
RF_ATTN = highMAX2373-10-6.5
MAX2371-40-35Reverse Isolation (S12)Over AGC rangeMAX2373-42-35dB
MAX23711314.516LNA_I = high, TA =
+25°C, VCC = 2.775VMAX23731415.517
MAX237110.512Max Power Gain (Note 3)
LNA_I = low, TA =
+25°C, VCC = 2.775VMAX237310.513
Gain Variation Over TemperatureTA = -40°C to +85°C, VAGC < 1.8V-2.02.0dB
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2371/MAX2373 EV Kits, VCC= 2.65V to 3.3V, RX_EN = high, RSET= 1.1kΩ, TA= -40°C to +85°C. Typical values are at VCC=
2.775V; for MAX2371 fRF= 150MHz, for MAX2373 fRF= 850MHz to 940MHz; TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
VAGC = 1.275V1.82.2
VAGC = 1.575V5.07.7
VAGC = 1.875V1114.5
LNA_I = high, TA =
+25°C, VCC = 2.775V,
RF_ATTN = low
VAGC = 2.175V20SSB Noise Figure vs. AGC
LNA_I = low, TA =
+25°C, VCC = 2.775V,
RF_ATTN = low
VAGC = 1.275V2.12.6
LNA_I = high-21.519.5RF_ATTN = low,
VAGC < 1.8VLNA_I = low-24-22
LNA_I = high-30Input 1dB Compression Point
RF_ATTN = high,
VAGC < 1.8VLNA_I = low-9-6.5
dBm
LNA_I = high-5-1
MAX2371-7-4RF_ATTN = low,
VAGC = VCC/2LNA_I = lowMAX2373-12-9
dBm
Input IP3 (Notes 4, 5)
RF_ATTN = high,
VAGC = VCC/2 to 2.575VLNA_I = high913dBm
MAX2371-10.5-8Input IP3 Over AGC RangeRF_ATTN = low, LNA_I = high,
VAGC = VCC/2 to 1.80VMAX2373-12.5-10.5dBm
AGC RESPONSE
AGC Attenuation Range (Note 6)VCC = 2.775V, RF_ATTN = low, VAGC = 1.3375V
to 2.575V, TA = +25°C3545dB
RF_ATTN = low, VAGC = 1.625V324047AGC Slope Over Control RangeRF_ATTN = high, VAGC = 1.625V243341dB/V
RF STEP ATTENUATOR
MAX237116.017.519.0Gain StepRF_ATTN = high to low,
LNA_I = highMAX237318.019.521.0dB
Note 1:Parameters over temperature and supply voltage range are guaranteed by design and characterization, unless otherwise noted.
Note 2:Operation outside these frequency bands is possible but has not been characterized. See Typical Operating Characteristics.
Note 3:Measured with external matching network.
Note 4:fIN1= 150MHz, fIN2= 150.1MHz, PIN= -30dBm for both tones (MAX2371).
Note 5:fIN1= 900MHz, fIN2= 900.1MHz, PIN= -30dBm for both tones (MAX2373).
Note 6:Parameters are guaranteed by production test.
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
Typical Operating Characteristics
(MAX2371/MAX2373 EV Kits, VCC= 2.775V, RX_EN = high, RSET= 1.1kΩ, LNA_I = high, TA= +25°C. For MAX2371, fRF= 150MHz;
for MAX2373, fRF= 900MHz, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX2371 toc01
FREQUENCY (MHz)
GAIN (dB)
TA = +85°CTA = -40°CTA = +25°C
RF_ATTN = LOW
RF_ATTN = HIGH
GAIN vs. VAGC
MAX2371 toc02
VAGC (V)
GAIN (dB)
RF_ATTN = LOW
RF_ATTN = HIGH
TA = +85°C
TA = +25°C
TA = -40°C
IIP3 vs. VAGC
MAX2371 toc03
VAGC (V)
IIP3 (dBm)
RF_ATTN = LOW
RF_ATTN = HIGH
TA = +85°CTA = +25°CTA = -40°C
P1dB vs. VAGC
MAX2371 toc04
VAGC (V)
1dB
(dBm)
TA = +25°C
RF_ATTN = LOW
RF_ATTN = HIGH
TA = +85°CTA = -40°C
NOISE FIGURE vs. VAGC
MAX2371 toc05
VAGC (V)
NOSIE FIGURE (dB)
RF_ATTN = LOW
RF_ATTN = HIGH
S11, S22, S12 vs. FREQUENCY
MAX2371 toc06
FREQUENCY (MHz)
S11, S22, S12 (dB)
S22
S11
S12
RF_ATTN = LOWRF_ATTN = HIGH
S11, S22, S12 vs. VAGC
MAX2371 toc07
VAGC (V)
S11, S22, S12 (dB)
S22
S11
S11
S12
RF_ATTN = HIGHRF_ATTN = LOW
MAX2371
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
IIP3 vs. VAGC
MAX2371 toc10
VAGC (V)
IIP3 (dBm)
RF_ATTN = LOW
RF_ATTN = HIGH
TA = -40°CTA = +25°CTA = +85°C
P1dB vs. VAGC
MAX2371 toc11
VAGC (V)
1dB
(dBm)
TA = -40°CTA = 85°CTA = +25°C
RF_ATTN = LOW
RF_ATTN = HIGH
NOISE FIGURE vs. VAGC
MAX2371 toc12
VAGC (V)
NOSIE FIGURE (dB)
RF_ATTN = LOW
RF_ATTN = HIGH
Typical Operating Characteristics (continued)
(MAX2371/MAX2373 EV Kits, VCC= 2.775V, RX_EN = high, RSET= 1.1kΩ, LNA_I = high, TA= +25°C. For MAX2371, fRF= 150MHz;
for MAX2373, fRF= 900MHz, unless otherwise noted.)
S11, S22, S12 vs. FREQUENCY
MAX2371 toc13
FREQUENCY (MHz)
S11, S22, S12 (dB)
S22
S11
S12
S11
RF_ATTN = LOWRF_ATTN = HIGH
S11, S22, S12 vs. VAGC
MAX2371 toc14
VAGC (V)
S11, S22, S12 (dB)
S22
S11
S11
S12
RF_ATTN = HIGHRF_ATTN = LOW
GAIN vs. FREQUENCY
MAX2371 toc08
FREQUENCY (MHz)
GAIN (dB)
TA = +85°CTA = -40°CTA = +25°C
RF_ATTN = LOW
RF_ATTN = HIGH
GAIN vs. VAGC
MAX2371 toc09
VAGC (V)
GAIN (dB)
RF_ATTN = LOW
RF_ATTN = HIGH
TA = -40°C
TA = +25°C
TA = +85°C
MAX2373
MAX2371/MAX2373
LNAs with Step Attenuator and VGA
Table 1. MAX2371 S-Parameters
(VCC= 2.775V, RX_EN = high, LNA_I = high, RF_ATTN = low, PIN= -30dBm, TA= +25°C.)
LNA (S11)LNA (S21)LNA (S12)LNA (S22)FREQUENCY
(MHz)MAGNITUDEPHASEMAGNITUDEPHASEMAGNITUDEPHASEMAGNITUDEPHASE0.943409-4.84775.980672171.12000.002136-102.4900.998803-1.1632
20000.060478160.47000.995004-53.54900.06392992.7880.971740-50.8360
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