MAX2642EXT+ ,900MHz SiGe, High-Variable IP3, Low-Noise AmplifierApplications800MHz/900MHz Cellular PhonesPIN-TOPPART TEMP. RANGEPACKAGE MARK900MHz Cordless PhonesM ..
MAX2643EXT-T ,900MHz SiGe / High IP3 / Low-Noise Amplifiersfeatures a 13dB attenuation step, which On-Chip Output Matchingextends the LNA’s dynamic range. Bo ..
MAX2643EXT-T ,900MHz SiGe / High IP3 / Low-Noise AmplifiersApplications800MHz/900MHz Cellular PhonesPIN-TOPPART TEMP. RANGEPACKAGE MARK900MHz Cordless PhonesM ..
MAX2644EXT ,2.4GHz SiGe, High IP3 Low-Noise AmplifierELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, R = 1.2kΩ, no RF signal applied, R and R are AC-coup ..
MAX2644EXT+T ,2.4GHz SiGe, High IP3 Low-Noise Amplifierapplications. The LNA provides up to +1dBm inputIP3 while maintaining a low noise figure of 2.0dB a ..
MAX2644EXT-T ,2.4GHz SiGe / High IP3 Low-Noise AmplifierApplications Ordering InformationBluetooth PIN- TOPPART TEMP RANGEPACKAGE MARK802.11 WLANMAX2644EXT ..
MAX6001EUR-T ,Low-Cost / Low-Power / Low-Dropout / SOT23-3 Voltage ReferencesFeaturesThe MAX6001–MAX6005 family of SOT23, low-cost' 1% max Initial Accuracyseries voltage refere ..
MAX6001EUR-T ,Low-Cost / Low-Power / Low-Dropout / SOT23-3 Voltage ReferencesApplicationsOrdering InformationPortable/Battery-Powered EquipmentNotebook ComputersPIN- SOTPART TE ..
MAX6002EUR+ ,Low-Cost, Low-Power, Low-Dropout, SOT23-3 Voltage ReferencesApplicationsOrdering InformationPortable/Battery-Powered EquipmentNotebook ComputersPIN- SOTPART TE ..
MAX6002EUR+T ,Low-Cost, Low-Power, Low-Dropout, SOT23-3 Voltage ReferencesELECTRICAL CHARACTERISTICS—MAX6001(V = +5V, I = 0, T = T to T , unless otherwise noted. Typical val ..
MAX6002EUR+T ,Low-Cost, Low-Power, Low-Dropout, SOT23-3 Voltage ReferencesApplicationsOrdering InformationPortable/Battery-Powered EquipmentNotebook ComputersPIN- SOTPART TE ..
MAX6002EUR-T ,Low-Cost / Low-Power / Low-Dropout / SOT23-3 Voltage ReferencesELECTRICAL CHARACTERISTICS—MAX6001(V = +5V, I = 0, T = T to T , unless otherwise noted. Typical val ..
MAX2642EXT+
900MHz SiGe, High-Variable IP3, Low-Noise Amplifier
General DescriptionThe MAX2642/MAX2643 low-cost, high third-order inter-
cept point (IP3), low-noise amplifiers (LNAs) are
designed for applications in cellular, ISM, SMR, and
PMR systems. They feature a programmable bias,
allowing the IP3 and supply current to be optimized for
specific applications. These LNAs provide up to 0dBm
input IP3 while maintaining a low noise figure of 1.3dB.
The gain for these devices is typically 17dB. The
MAX2642 also features a 13dB attenuation step, which
extends the LNA’s dynamic range. Both devices feature
a shutdown mode that minimizes power consumption.
On-chip output matching saves board space by reduc-
ing the number of external components.
The MAX2642/MAX2643 are designed on a low-noise,
advanced silicon-germanium (SiGe) process technolo-
gy. They operate from a +2.7V to +5.5V single supply
and are available in the ultra-small 6-pin SC70 package.
________________________Applications800MHz/900MHz Cellular Phones
900MHz Cordless Phones
868MHz/900MHz ISM-Band Wireless Data
PMR/SMR/LMR
FeaturesWide Frequency Range: 800MHz to 1000MHzHigh Output IP3 and Adjustable
+17dBm at 5.3mA
+7dBm at 2.8mALow Noise Figure: 1.3dB at 900MHz13dB Attenuation Step (MAX2642)On-Chip Output MatchingLow-Power Shutdown Mode+2.7V to +5.5V Single-Supply OperationUltra-Small SC70-6 Package
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise AmplifiersGND
VCCRFINRFOUTGND
BIAS
MAX2642
MAX2643
SC70-6TOP VIEW
Pin Configuration19-1682; Rev 0; 4/00
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information6 SC70-6
PIN-
PACKAGETEMP. RANGE-40°C to +85°C
MAX2642EXT-T
PARTAAC
TOP
MARK6 SC70-6-40°C to +85°C
MAX2643EXT-TAAD
MAX2642
MAX2643
RF
INPUT
GND
RFINRFOUT
( ) ARE FOR MAX2643.
3.3pF
8.7nH
BIAS
VCC
VCC
47pF
RBIAS
510Ω
RF
OUTPUT
33k
(10k)
LOW GAIN
(ENABLE)
HIGH GAIN
(SHUTDOWN)
BIAS
Typical Operating Circuit
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS—MAX2642(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50Ω, high-
gain mode. Typical values are at VCC= 3.0V, TA= +25°C, unless otherwise noted.) (Notes 1, 2, 3)
DC ELECTRICAL CHARACTERISTICS—MAX2643(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50Ω. Typical
values are at VCC= 3.0V, TA= +25°C, unless otherwise noted.) (Notes 1, 8, 9)
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 +6V
RFOUT to GND...........................................-0.3V to (VCC+ 0.3V)
RFIN to GND..................................................................0 to 0.9V
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)
SC70-6 (derate 3.1mW/°C above +70°C)...................245mW
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITSSupply Voltage2.75.5V
High-gain mode, RBIAS = 510Ω, TA = +25°C5.36.7
RBIAS = 510Ω, TA = -40°C to +85°C7.5
RBIAS = 806Ω3.6
RBIAS = 1.1kΩ2.8
Operating Supply Current
Low-gain mode, RBIAS = 510Ω, TA = 25°C5.9
Shutdown Supply CurrentBIAS = unconnected (see Applications Information)0.2mA
High-gain mode (Note 4)0.6Gain Control Voltage InputLow-gain mode (Note 5)2.0V
High-gain mode (Note 6)-100Gain Control Input CurrentLow-gain mode (Note 7)050μA
PARAMETERCONDITIONSMINTYPMAXUNITSSupply Voltage2.75.5V
RBIAS = 510Ω, TA = +25°C5.16.5
RBIAS = 510Ω, TA = -40°C to +85°C7.3
RBIAS = 806Ω3.4Operating Supply Current
RBIAS = 1.1kΩ2.6
Shutdown Supply CurrentShutdown mode (see Applications Information)0.210μA
Normal operation (Note 10)2.0Shutdown Control Input VoltageShutdown mode (Note 11)0.6V
Normal operation (Note 7)010Shutdown Control Input Current
Shutdown mode (Note 6)-55
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS(MAX2642/MAX2643 EV kits, PRFIN= -30dBm, fRFIN= 900MHz, input and output are terminated to 50Ω, VCC= +3.0V, TA= +25°C,
RBIAS= 510Ω, unless otherwise noted.) (Note 12)
PARAMETERCONDITIONSMINTYPMAXUNITSOperating Frequency Range(Note 13)8001000MHz
Gain (Note 14)TA = +25°C14.516.719dB
Gain Variation Over TemperatureTA = -40°C to +85°C±0.35±0.75dB
Attenuation StepMAX2642 only13dB
RBIAS = 510Ω0
RBIAS = 806Ω-5Input Third-Order Intercept Point
(Note 15)RBIAS = 1.1kΩ-10
dBm
Input 1dB Compression PointMAX2642, low-gain mode-17dBm
Noise Figure (Note 16)MAX2642, low-gain mode4.3dB
Input Return LossMAX2642, low-gain mode-10-18dB
-10-14Output Return LossMAX2642, low-gain mode-10-11dB
-20-26Reverse IsolationMAX2642, low-gain mode-10-17dB
Gain-Step Response TimeMAX2642510μs
MAX2643610Shutdown Response Time
MAX2642, through series switch at BIAS12
Note 1:Devices are production tested at TA= +25°C. Minimum and maximum values are guaranteed by design and characterization
over temperature and supply voltage.
Note 2:High-gain mode is set for the MAX2642 by connecting RFOUT to GND through a 33kΩresistor.
Note 3:Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to VCCthrough a 33kΩresistor.
Note 4:Maximum DC voltage through a 33kΩresistor that sets the MAX2642 to operate in high-gain mode.
Note 5:Minimum DC voltage through a 33kΩresistor that sets the MAX2642 to operate in low-gain mode.
Note 6:DC current required when RFOUT is connected to GND through a 33kΩresistor (MAX2642) and 10kΩresistor (MAX2643).
Note 7:DC current required when RFOUT is connected to VCCthrough a 33kΩresistor (MAX2642) and 10kΩresistor (MAX2643).
Note 8:Normal operation is set for the MAX2643 by connecting RFOUT to VCCthrough a 10kΩresistor.
Note 9:Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10kΩresistor.
Note 10:Minimum DC voltage through a 10kΩresistor that sets the MAX2643 to operate in normal mode.
Note 11:Maximum DC voltage through a 10kΩresistor that sets the MAX2643 to operate in shutdown mode.
Note 12:Min/Max limits are guaranteed by design and characterization, except gain is production tested at TA= +25°C.
Note 13:The part has been characterized at the specified frequency range. Operation outside this range is possible but not guar-
anteed.
Note 14:Devices are production tested at TA= +25°C.
Note 15:Measured with two input tones, f1= 895MHz and f2= 905MHz, both at -30dBm per tone.
Note 16:Excludes PC board losses (0.25dB typical at the input of the MAX2642/MAX2643 EV kit).
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Typical Operating Characteristics(MAX2642/MAX2643 EV kits, VCC= +3.0V, PRFIN= -30dBm, input and output are terminated to 50Ω, fRFIN= 900MHz, RBIAS=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), TA= +25°C, unless otherwise noted.)
INPUT THIRD-ORDER INTERCEPT
vs. RBIAS (HIGH GAIN)
MAX2642/43-01
RBIAS (Ω)
INPUT IP3 (dBm)
TA = +85°C
TA = +25°C
TA = -40°C
MAX2642
INPUT THIRD-ORDER INTERCEPT
vs. RBIAS (LOW GAIN)
MAX2642/43-02
RBIAS (Ω)
INPUT IP3 (dBm)500100015002000
TA = +85°C
TA = +25°C
TA = -40°C
NOISE FIGURE vs. FREQUENCY
MAX2642/43-03
FREQUENCY (MHz)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
MATCHED AT 900MHz
NOISE FIGURE vs. TEMPERATURE
MAX2642/43-04
TEMPERATURE(°C)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
P1dB vs. RBIAS
MAX2642/43-05
RBIAS (Ω)
P1dB (dBm)
TA = -40°C,
HIGH GAIN
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
OUTPUT POWER vs. INPUT POWER
MAX2642/43-06
PIN (dBm)
OUT
(dBm)
510Ω, HIGH GAIN
1.1kΩ, LOW GAIN
510Ω, LOW GAIN
806Ω, LOW GAIN
806Ω, HIGH GAIN
1.1kΩ, HIGH GAIN40060080020010001200140016001800
GAIN vs. RBIASMAX2642/43-07
RBIAS(Ω)
GAIN (dB)
TA = +85°C, HIGH GAIN
TA = -40°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C,
HIGH GAIN
TA = +25°C, LOW GAIN
GAIN vs. SUPPLY VOLTAGE
MAX2642/43-08
VCC (V)
GAIN (dB)
TA = +85°C, HIGH GAIN
TA = -40°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
GAIN vs. FREQUENCY
MAX2642/43-09
FREQUENCY (MHz)
GAIN (dB)
MATCHED AT 900MHz
LOW-GAIN MODE
HIGH-GAIN MODE
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise AmplifiersMAX2642
ATTENUATION STEP vs. FREQUENCY
MAX2642/43-10
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
RETURN LOSS vs. FREQUENCY
(HIGH GAIN)
MAX2642/43-11
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
MAX2642
RETURN LOSS vs. FREQUENCY
(LOW GAIN)
MAX2642/43-12
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
REVERSE ISOLATION vs. FREQUENCY
MAX2642/43-13
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
LOW GAIN
HIGH GAIN
MAX2642
HIGH/LOW-GAIN SWITCH
CHARACTERISTICS
MAX2642/43-14
TIME (400ns/div)
OUTPUT POWER (dBm)VRFOUT0V
MAX2643
SHUTDOWN CHARACTERISTICS
MAX2642/43-15
TIME (4μs/div)
OUTPUT POWER (dBm)VRFOUT4006002008001000120014001600
SUPPLY CURRENT vs. RBIASMAX2642/43-16
RBIAS (Ω)
SUPPLY CURRENT (mA)
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
TA = -40°C, HIGH GAIN
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX2642/43-17
TEMPERATURE (°C)
SHUTDOWN CURRENT (VCC = 5.5V
VCC = 3.0V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2642/43-18
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (mA)
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
TA = -40°C,
HIGH GAIN
Typical Operating Characteristics (continued)(MAX2642/MAX2643 EV kits, VCC= +3.0V, PRFIN= -30dBm, input and output are terminated to 50Ω, fRFIN= 900MHz, RBIAS=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), TA= +25°C, unless otherwise noted.)
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Pin Description
PINNAMEFUNCTIONBIAS
Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply
current (see Applications Information). The current through this pin is approximately 50mV divided
by RBIAS.
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 47pF capacitor directly to ground at the supply pin. Additional
bypassing may be necessary for long VCC lines.RFOUTAmplifier Output. Internally matched to 50Ω. DC bias on this pin selects gain mode (MAX2642) or
shutdown mode (MAX2643) (see Applications Information).
Applications Information
Input MatchingInput matching is required for optimum performance.
The MAX2642/MAX2643 require 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 transmis-
sion line. The Typical Operating Circuitshows the rec-
ommended input-matching networks for the MAX2642/
MAX2643 at 900MHz. These values are optimized for
best simultaneous gain, noise figure, and return-loss
performance. To aid in the design of the matching net-
work for other frequencies, Tables 1–6 list typical
device S-parameters for various biases, and Tables 7,
8, and 9 list typical device noise parameters.
Attenuation Step (MAX2642)The MAX2642’s DC bias voltage at RFOUT serves as
an attenuation step input. When the DC voltage at
RFOUT through a 33kΩresistor is less than +0.6V, the
device is in high-gain mode; if the DC voltage is greater
than +2.0V, the device is in low-gain mode. A standard
logic output can be applied as shown in the Typical
Operation Circuit. If no bias is applied, the device is in
high-gain mode.
ShutdownFor the MAX2643, the recommended shutdown method
is to set the DC voltage at the RFOUT pin in a manner
similar to the MAX2642’s attenuation step. That is, when
the DC voltage at RFOUT is below +0.6V, the device is
shut down; if the DC voltage is greater than +2.0V, the
device is enabled.
For the MAX2642, shutdown is achieved by leaving
BIAS unconnected. Figure 1 shows the suggested
shutdown methods. Avoid capacitance at the BIAS pin
by connecting the bias resistor from BIAS to the switch.
Table 10 summarizes the operational modes.
Layout IssuesA 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.
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Table 1. MAX2642/MAX2643 Typical Scattering Parameters(RBIAS= 510Ω, high-gain mode, VCC= +3.0V, TA= +25°C.)
FREQ
(MHz)S11 MAGS11 PHASE
(DEGREES)S21 MAGS21 PHASE
(DEGREES)S12 MAGS12 PHASE
(DEGREES)S22 MAGS22 PHASE
(DEGREES)15000.587409-158.213.33838597.629610.07649192.844210.326279-40.68451
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Table 2. MAX2642/MAX2643 Typical Scattering Parameters (RBIAS= 806Ω, high-gain mode, VCC= +3.0V, TA= +25°C.)
FREQ
(MHz)S11 MAGS11 PHASE
(DEGREES)S21 MAGS21 PHASE
(DEGREES)S12 MAGS12 PHASE
(DEGREES)S22 MAGS22 PHASE
(DEGREES)15000.616202-153.5362.75615596.438760.07466492.887470.360706-35.70454
