MAX2644EXT-MAX2644EXT+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX2644EXT-MAX2644EXT+T
2.4GHz SiGe, High IP3 Low-Noise Amplifier
EVALUATION KIT
AVAILABLE
MAX2644
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
19-1786; Rev 1; 11/03
GND
VCCRFINRFOUTGND
BIAS
MAX2644
SC70-6
TOP VIEW
Pin Configuration
MAX2644
GND
BIAS
RBIAS
1.2kΩ
RF OUTPUTRF INPUT
VCC
VCC
RFOUTRFIN
33pF
3.3nH
BIAS
Typical Operating Circuit
General Description
The MAX2644 low-cost, high third-order intercept point
(IP3) low-noise amplifier (LNA) is designed for applica-
tions in 2.4GHz WLAN, ISM, and Bluetooth radio sys-
tems. It features a programmable bias, allowing the
input IP3 and supply current to be optimized for specif-
ic applications. The LNA provides up to +1dBm input
IP3 while maintaining a low noise figure of 2.0dB and a
typical gain of 16dB.
The MAX2644 is designed on a low-noise, advanced
silicon-germanium (SiGe) technology. It operates with a
+2.7V to +5.5V single supply and is available in an
ultra-small 6-pin SC70 package.
________________________Applications
Bluetooth
802.11 WLAN
Home RF
Satellite CD Radio
2.4GHz ISM Band Radios
2.4GHz Cordless Phones
Wireless Local Loop (WLL)
FeaturesLow Noise Figure (2.0dB at 2450MHz)High Gain: 16dBAdjustable IP3 and Bias CurrentLow-Power Standby ModeOn-Chip Output Matching+2.7V to +5.5V Single-Supply OperationUltra-Small 6-Pin SC70 Package
Ordering Information
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX2644EXT-T-40°C to +85°C6 SC70AAG
MAX2644
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +5.5V, RBIAS= 1.2kΩ, no RF signal applied, RFINand RFOUT are AC-coupled and terminated to 50Ω, TA= -40°C to
+85°C. Typical values are at VCC= +3.0V, TA= +25 °C, unless otherwise noted.) (Note 1)
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.
Note 1:Devices are production tested at TA= +25°C. Minimum and maximum values are guaranteed by design and characterization
over temperature and supply voltages.
Note 2:Min/Max limits are guaranteed by design and characterization.
Note 3:The part has been characterized at the specified frequency range. Operation outside this range is possible but not guaranteed.
Note 4:Excluding PC board losses (0.3dB at the input and 0.3dB at the output of the MAX2644 EV kit).
Note 5:Measured with two input tones (f1= 2445MHz, f2= 2455MHz) both at -30dBm per tone. Input IP3 can be improved to
+1dBm with circuit shown in Figure 2.
Note 6:Excluding PC board losses (0.3dB typical at the input of the MAX2644 EV kit).
VCC to GND..............................................................-0.3V to +6V
RFIN, RFOUT to GND…......................................................±0.3V
RFIN Power (50Ωsource)................................................+5dBm
BIAS to GND................................................................0 to +0.3V
Operating Temperature Range...........................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Continuous Power Dissipation (TA= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
Supply Voltage2.75.5V
RBIAS = 3.9kΩ2.7
RBIAS = 1.2kΩ, TA = +25°C7.09.7
RBIAS = 1.2kΩ, TA = -40°C to +85°C11.0Operating Supply Current
RBIAS = 750Ω10.2
Standby Supply CurrentRBIAS is unconnected, TA = +25°C, VCC = 3.3V100µA
AC ELECTRICAL CHARACTERISTICS
(MAX2644 EV kit, VCC= +3.0V, fRFIN= 2450MHz, PRFIN= -30dBm, input and output are terminated to 50Ω, RBIAS= 1.2kΩ, = +25°C, unless otherwise noted.) (Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
Operating Frequency(Note 3)24002500MHz
Gain (Note 4)1517dB
Gain Variation Over TemperatureTA = -40°C to +85°C±0.7±1.0dB
RBIAS = 750Ω-4
RBIAS = 1.2kΩ-3Input Third-Order Intercept Point
(Note 5)
RBIAS = 3.9kΩ-8
dBm
Input 1dB Compression Point-13dBm
Noise Figure(Note 6)2.02.5dB
Input Return Loss-15dB
Output Return Loss-10dB
Reverse Isolation-30dB
MAX2644
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
Typical Operating Characteristics
(PRFIN= -30dBm, ZS= ZL= 50Ω, VCC= +3.0V, fRFIN = 2450MHz, RBIAS= 1.2kΩ, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2644 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)TA = +25°CTA = -40°C
TA = +85°C
RBIAS = 1.2kΩ
GAIN vs. RBIAS
MAX2644 toc05
RBIAS (kΩ)
GAIN (dB)
TA = -40°C
TA = +85°C
TA = +25°C
INPUT AND OUTPUT RETURN LOSS
vs. FREQUENCY
MAX2644 toc06
FREQUENCY (MHz)
REVERSE ISOLATION (dB)
OUTPUT RETURN LOSS
RBIAS = 1.2kΩ
INPUT RETURN LOSS
NOISE FIGURE vs. FREQUENCY
MAX2644 toc08
FREQUENCY (MHz)
NOSIE FIGURE (dB)
RBIAS = 1.2kΩ
NOISE FIGURE vs. TEMPERATURE
MAX2644 toc09
TEMPERATURE (°C)
NOSIE FIGURE (dB)
RBIAS = 1.2kΩ
GAIN vs. FREQUENCY
MAX2644 toc04
FREQUENCY (MHz)
GAIN (dB)
TA = -40°C
TA = +85°C
TA = +25°C
RBIAS = 1.2kΩ
REVERSE ISOLATION vs. FREQUENCY
MAX2644 toc07
FREQUENCY (MHz)
REVERSE ISOLATION (dB)
TA = +25°C
TA = +85°C
RBIAS = 1.2kΩ
TA = -40°C
SUPPLY CURRENT vs. RBIAS
MAX2644 toc02
RBIAS (kΩ)
SUPPLY CURRENT (mA)
TA = +25°C
TA = +85°C
TA = -40°C
GAIN vs. SUPPLY VOLTAGE
MAX2644 toc03
SUPPLY VOLTAGE (V)
GAIN (dB)
TA = +25°C
RBIAS = 1.2kΩ
TA = +85°C
TA = -40°C
MAX2644
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
Pin Description
PINNAMEDESCRIPTIONBIAS
Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply
current. The current through this pin is approximately 60mV divided by RBIAS (see Applications
Information).
2, 5GNDGround. For optimum performance, provide a low-inductance connection to the ground plane.RFINAmplifier Input. AC-couple to this pin with a DC blocking capacitor. External matching network is
required for optimum performance.
4VCCSupply Voltage. Bypass with a capacitor directly to ground at the supply pin. Refer to VCC Line
Bypassing section for more information.RFOUTAmplifier Output. AC-coupled internally.
Typical Operating Characteristics (continued)
(PRFIN= -30dBm, ZS= ZL= 50Ω, VCC= +3.0V, fRFIN = 2450MHz, RBIAS= 1.2kΩ, TA= +25°C, unless otherwise noted.)
OUTPUT POWER vs. INPUT POWER
MAX2644 toc10
INPUT POWER (dBm)
OUTPUT POWER (dBm)
RBIAS = 750Ω
RBIAS = 1.2kΩ
RBIAS = 3.9kΩ
IIP3 vs. RBIAS
MAX2644 toc11
IIP3 (dBm)
RBIAS (kΩ)
TA = +85°C
TA = +25°C
TA = -40°C
INPUT P1dB vs. RBIAS
MAX2644 toc12
INPUT P
1dB
(dBm)
RBIAS (kΩ)
TA = +85°C
TA = -40°C
TA = +25°C
MAX2644
SMA
RFIN
SMA
RFOUT
33pF
L1
3.3nH
1.2kΩVCC
GND
2.2pF
Length = 400mils
33pF
VCC
GND
RFIN
GND
RFOUTBIAS
GAIN: 17dB
IIP3: -3dBm
Figure 1. High Gain Design
MAX2644
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
Applications Information
Input Matching
Input matching is required for optimum performance.
The MAX2644 requires a simple LC matching network,
as shown in the Typical Operating Circuit. To further
reduce cost and external component count, replace the
external inductor with a microstrip transmission line.
The Typical Operating Circuitshows the recommended
input matching network for the MAX2644 at 2450MHz.
These values are optimized for best simultaneous gain,
noise figure, and return loss performance.
VCCLine Bypassing
Bypassing the VCCline is necessary for optimum
gain/linearity performance. A transmission line and two
capacitors are required, as shown in the schematics in
Figures 1 and 2. The optimum dimensions and posi-
tions of the components are as follows: the output
transmission line dimension is 0.532in (length) ✕0.012in
(width); the distance from C2 to the IC is 0.352in; and
the distance from C3 to the IC is 0.041in. Please refer
to Figures 1 and 2 for component values.
MAX2644
SMA
RFIN
SMA
RFOUT
33pF
L1
3.3nH6VCC
GND
15pF
Length = 400mils
33pF
VCC
GND
RFIN
GND
RFOUTBIAS
GAIN: 16dB
IIP3: +1dBm
L2
3.9nH
1.2kΩ
Figure 2. High Linearity Design
MAX2644MAX2644
BIASBIAS
(a)(b)
Figure 3. Recommended MAX2644 Standby Configurations
MAX2644
Standby
Standby mode is achieved by disconnecting BIAS as
shown in Figure 1. Avoid capacitance at the BIAS pin
by connecting the bias resistor from BIAS to the switch.
Layout Issues
A properly designed PC board is essential to any
RF/microwave circuit. Use controlled impedance lines
on all high-frequency inputs and outputs. Bypass with
decoupling capacitors located close to the device VCC
pin. For long VCClines, it may be necessary to add
additional decoupling capacitors. These additional
capacitors can be located farther away from the device
package. Proper grounding of the GND pins is essen-
tial. If the PC board uses a topside RF ground, connect
it directly to all GND pins. For a board where the
ground plane is not on the component layer, the best
technique is to connect the GND pins to the board with
a plated through-hole located close to the package.
2.4GHz SiGe,
High IP3 Low-Noise Amplifier
Table 1. MAX2644 Typical Scattering Parameters
(RBIAS= 750Ω, VCC= +3.0V, TA= +25°C.)
FREQ.
(MHz)
S11
MAG
S11 PHASE
(DEGREES)
S21
MAG
S21 PHASE
(DEGREES)
S12
MAG
S12 PHASE
(DEGREES)
S22
MAG
S22 PHASE
(DEGREES)
FREQ.
(MHz)
S11
MAG
S11 PHASE
(DEGREES)
S21
MAG
S21 PHASE
(DEGREES)
S12
MAG
S12 PHASE
(DEGREES)
S22
MAG
S22 PHASE
(DEGREES)
Table 2. MAX2644 Typical Scattering Parameters
(RBIAS= 1.2kΩ, VCC= +3.0V, TA= +25°C.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX2644EXT+T \|MAX2644EXTT	MAXIM	N/a	7500	avai	2.4GHz SiGe, High IP3 Low-Noise Amplifier
MAX2644EXT	MAXIM	N/a	3120	avai	2.4GHz SiGe, High IP3 Low-Noise Amplifier