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MAX2470EUT-MAX2470EUT+-MAX2470EUT+T-MAX2471EUT+T
10MHz to 500MHz, VCO Buffer Amplifiers with Differential Outputs
General DescriptionThe MAX2470/MAX2471 are flexible, low-cost, high-
reverse-isolation buffer amplifiers for applications with
discrete and module-based VCO designs. Both feature
differential 50Ωoutputs for driving a single differential
(balanced) load or two separate single-ended (unbal-
anced) 50Ωloads. The MAX2470 offers a single-ended
input and has two selectable frequency ranges of oper-
ation: 10MHz to 500MHz and 10MHz to 200MHz. The
MAX2471 offers a differential input and operates from
10MHz to 500MHz. The MAX2470/MAX2471 also feature
high input impedance for maximum flexibility, enabling
them to be used with a variety of oscillator topologies.
High reverse isolation combined with low supply current
make them ideal for applications requiring high perfor-
mance with low power.
These devices are also ideal for use as active baluns.
The MAX2470 converts a single-ended input to a differ-
ential output. The MAX2471 is useful as a differential
buffer stage or to convert from a differential input to two
single-ended outputs.
The MAX2470 operates from a single +2.7V to +5.5V
supply. At -5dBm output power, it consumes 5.5mA in
the high-frequency range and only 3.6mA in the
low-frequency range. The MAX2471 operates from a
+2.7V to +5.5V single supply andconsumes 5.5mA.
Both devicesare available in ultra-small SOT23-6 plas-
tic packages, requiring minimal board space.
ApplicationsCellular and PCS Mobile Phones
ISM-Band Applications
Active Baluns
General-Purpose Buffers/Amplifiers
Feature+2.7V to +5.5V Supply Range Input Frequency Range
High: 10MHz to 500MHz (MAX2470/2471)
Low: 10MHz to 200MHz (MAX2470)>14dB Power Gain at 200MHz64dB Typical Reverse Isolation at 200MHzLow-Distortion Output DriveUltra-Small SOT23-6 PackageHigh Input ImpedanceSingle-Ended (MAX2470) or Differential
(MAX2471) Inputs0MHz to 500MHz VCO Buffer Amplifieith Differential OutputOUT
BIAS
VCC
GND
OUT
50W
50W
HI/LO
MAX2470
OUT
BIAS
VCC
GND
OUT
50W
50W
MAX2471
GND
HI/LO (IN)OUT
( ) ARE FOR MAX24716VCCIN
OUT
MAX2470
MAX2471
SOT23-6TOP VIEW4
Typical Operating Circuits19-4797; Rev 0; 2/99
PART
MAX2470EUT-T
MAX2471EUT-T-40°C to +85°C
-40°C to +85°C
TEMP. RANGEPIN-
PACKAGE6 SOT23-6
6 SOT23-6
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Pin Configuration
Ordering Information
SOT TOP
MARKAAAX
AAAY
fOUT= 200MHz,
RHI/LO= GND
No signal
0MHz to 500MHz VCO Buffer Amplifiers ith Differential Outputs
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(Typical Operating Circuit, VCC= +2.7V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +3V, = +25°C.) (Note 1)
AC ELECTRICAL CHARACTERISTICS—MAX2470(VCC= +3V, HI/LO= VCC, all outputs are differentially measured between OUT and OUTdriving a 50Ωload through a 180°hybrid,= +25°C, unless otherwise 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 +7V
IN to GND......-0.3V to (VCC+ 0.3V) or 3.7V (whichever is lower)to IN..................................................................-2.2V to +2.2V
HI/LOto GND.............................................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation
SOT23-6 (derate 8.7mW/°C above +70°C)...................696mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec )............................+300°C
VHI/LO= GND or VCC
CONDITIONS5.17.42.75.5VCCSupply Voltage Range-1010IINHI/LOInput Bias Current
3.04.52.0VIHHI/LOInput Level High0.6VILHI/LOInput Level Low
UNITSMINTYPMAXSYMBOLPARAMETERHI/LO= VCC
HI/LO= GND
HI/LO= VCC
CONDITIONSMHz10200fIN10500Input Frequency Range
(Note 2)
UNITSMINTYPMAXSYMBOLPARAMETER
HI/LO= VCC5.5
HI/LO= GND3.6
ICCSupply Current
fIN= 10MHz, HI/LO= GND
RSOURCE= 50Ω
V/V16AVVoltage Gain (Note 4)
10.2Noise Figure
HI/LO= GND
IS21I2Gain (Note 3)
No signal
POUT= -5dBm,
RLOAD= 100Ωdiff.
No signal
POUT= -5dBm,
RLOAD= 100Ωdiff.
fIN= 10MHz
fIN= 200MHz
fIN= 500MHz, = TMINto TMAX
fIN= 10MHz
fIN= 200MHz
fIN= 200MHz,= TMINto TMAX
fOUT= 500MHz,
HI/LO= VCC
fOUT= 200MHz,
RHI/LO= GND
0MHz to 500MHz VCO Buffer Amplifiers ith Differential OutputAC ELECTRICAL CHARACTERISTICS—MAX2471(Typical values are measured at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 8)
AC ELECTRICAL CHARACTERISTICS—MAX2470 (continued)(VCC= +3V, HI/LO= VCC, all outputs are differentially measured between OUT and OUTdriving a 50Ωload through a 180°hybrid,= +25°C, unless otherwise noted.)
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the entire operating temperature range are guaranteed by
design and characterization but are not production tested.
Note 2:The part has been characterized over the specified frequency range. Operation outside of this range is possible but not
guaranteed.
Note 3:Gain specified for POUT= -5dBm.
Note 4:Voltage gain measured with no input termination and no output load.
Note 5:Output VSWR is a single-ended measurement for each OUT and OUT.
Note 6:OUT to IN isolation with OUTterminated with 50Ω.
Note 7:Input terminated with 50Ω.
Note 8:Unless otherwise noted: all inputs are differentially measured between IN and INdriven by a 50Ωload through a 180°
hybrid; all outputs are differentially measured between OUT and OUTdriving a 50Ωload through a 180°hybrid.
10MHz < fOUT< 500MHz, HI/LO= VCC1.5:1
CONDITIONS10MHz < fOUT< 200MHz, HI/LO= GND1.2:1VSWROUTMaximum Output VSWR
(OUT, OUT) (Note 5)
UNITSMINTYPMAXSYMBOLPARAMETERfIN= 500MHz, HI/LO= VCC37
fIN= 200MHz, HI/LO= GNDdB45
Isolation OUT to OUT
(Note 7)
HI/LO= VCC
IS12I2Reverse Isolation
(Note 6)
fIN= 200MHz, POUT= -5dBm, HI/LO= GNDdBc-30Harmonic SuppressionfIN= 500MHz, POUT= -5dBm, HI/LO= VCC-26
fIN= 100MHz
fIN= 500MHz
fIN= 100MHz
fIN= 200MHzHI/LO= GND
fIN= 10MHz
fOUT= 500MHz, RSOURCE= 50Ω
fIN= 10MHzIS21I2Gain (Note 3)
V/V16AVVoltage Gain (Note 4)
fIN= 200MHz
CONDITIONSfIN= 500MHz, TA= TMINto TMAX11.315.617.8
MHz10500fINInput Frequency Range
(Note 2)
UNITSMINTYPMAXSYMBOLPARAMETERNFNoise Figure
10MHz < fOUT< 500MHz1.5:1VSWROUTMaximum Output VSWR
(OUT, OUT) (Note 5)
fIN= 100MHz74
fIN= 500MHz57dBIS12I2Reverse Isolation
fIN= 500MHz35dBIsolation OUT to OUT(Note 7)
fIN= 500MHz, POUT= -5dBm-29dBcHarmonic Suppression
0MHz to 500MHz VCO Buffer Amplifiers ith Differential OutputsTypical Operating Characteristics(VCC= +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA= +25°C, unless otherwise
noted.)
MAX2470
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(HI/LO = GND)
X2470/71-01
SUPPLY VOLTAGE (V)
(m
-5dBm OUTPUT POWER
fIN = 200MHz
HI/LO = GND
TA = +85°C
TA = +25°C
TA = -40°C
MAX2470 (HI/LO = VCC) AND MAX2471
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2470/71-02
SUPPLY VOLTAGE (V)
(m
TA = +25°C
-5dBm OUTPUT POWER
fIN = 500MHz
HI/LO = GND (MAX2470)
TA = -40°C
TA = +85°C
MAX2470
OUTPUT POWER vs. INPUT POWER
AX2470/71-03
INPUT POWER (dBm)
(dHI/LO = GND
fIN = 200MHz
HI/LO = VCC
fIN = 500MHz
2470/71-04
FREQUENCY (MHz)
TA = -40°C
HI/LO = GND
MAX2470
TRANSDUCER GAIN vs. FREQUENCY
(HI/LO = GND)TA = +25°C
TA = +85°C
MAX2470
NOISE FIGURE vs. FREQUENCY
(HI/LO = VCC)
X2470/71-07
(d
HI/LO = VCC
MAX2470
TRANSDUCER GAIN vs. FREQUENCY
(HI/LO = VCC)
2470/71-05
FREQUENCY (MHz)
TA = +85°C
TA = +25°C
TA = -40°C
HI/LO = VCC
MAX2470
NOISE FIGURE vs. FREQUENCY
(HI/LO = GND)
X2470/71-06
FREQUENCY (MHz)
(d
HI/LO = GND
10,00015020050100350500
MAX2470
REAL INPUT IMPEDANCE vs. FREQUENCYAX2470/71-08
[Z
] (W
HI/LO = VCC
MAX2470
IMAGINARY INPUT IMPEDANCE vs. FREQUENCY
X2470/71-09
[Z
] (W
HI/LO = VCC
0MHz to 500MHz VCO Buffer Amplifiers ith Differential OutputMAX2470
OUTPUT VSWR vs. FREQUENCY
AX2470/71-10
FREQUENCY (MHz)
HI/LO = VCC
INPUT TERMINATED IN 50W
SINGLE-ENDED MEASUREMENT
OUT
OUT200100300400500
MAX2470
OUTPUT ISOLATION vs. FREQUENCYX2470/71-11
FREQUENCY (MHz)
IS
(d
HI/LO = VCC
SINGLE-ENDED
MEASUREMENT
OUT TO IN
OUT TO IN
OUT TO OUT
INPUT TERMINATED IN 50W
MAX2471
OUTPUT POWER vs. INPUT POWER
X2470/71-12
INPUT POWER (dBm)
(dfIN = 200MHz
fIN = 500MHz
Typical Operating Characteristics (continued)(VCC= +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA= +25°C unless otherwise
noted.)
MAX2471
DIFFERENTIAL TRANSDUCER
POWER GAIN vs. FREQUENCY
AX2470/71-13
FREQUENCY (MHz)
(d
TA = +25°C
TA = +85°C
TA = -40°C
MAX2471
NOISE FIGURE vs. FREQUENCY
AX2470/71-14
FREQUENCY (MHz)
(d
10,00015020050100250300350400450500
MAX2471
REAL INPUT IMPEDANCE vs. FREQUENCYAX2470/71-15
FREQUENCY (MHz)
[Z
] (W
MAX2471
IMAGINARY INPUT IMPEDANCE
vs. FREQUENCY
X2470/71-16
FREQUENCY (MHz)
[Z
] (W
MAX2471
OUTPUT VSWR vs. FREQUENCY
AX2470/71-17
FREQUENCY (MHz)
INPUT TERMINATED
SINGLE-ENDED MEASUREMENT
VSWR OUT
VSWR OUT200300100400500
MAX2471
OUTPUT ISOLATION vs. FREQUENCY2470/71-18
FREQUENCY (MHz)
IS
(d
OUT TO IN
INPUT TERMINATED IN 50W
OUT TO OUT
SINGLE-ENDED
MEASUREMENT
_______________Detailed Description
Bandwidth Control CircuitryThe MAX2470 features a logic-controlled bias circuit
which optimizes the performance for input frequencies
from 10MHz to 500MHz (HI/LO= VCC) and 10MHz to
200MHz (HI/LO= GND). Operating with HI/LO= GND
significantlyreduces power consumption.
__________Applications Information
Input ConsiderationsThe MAX2470/MAX2471 offer high-impedance inputs,
ideal for low-distortion buffering of a VCO. For applica-
tions with discrete transistor-based oscillator designs,
simply AC-couple the oscillator directly to the inputs.
The buffer’s high input impedance results in minimal
loading on the oscillator. For still higher real input
impedance and reduced loading effects, match the
inputs with a shunt-L matching circuit followed by a
series blocking capacitor. For use with 50ΩVCO mod-
ules, terminate the buffer input(s) with a 50Ωshunt
resistor followed by a series-blocking capacitor. This
provides a very stable 50Ωtermination and increases
reverse isolation. For those applications needing both
high gain and good input match, reactively match the
buffer inputs to 50Ωwith simple two-element matching
circuits followed by a series blocking capacitor.
Output ConsiderationsThe MAX2470 and MAX2471 incorporate fully differen-
tial output stages capable of driving an AC-coupled
100Ωdifferential load or two AC-coupled 50Ωsingle-
ended loads. This is ideal for applications that require
the oscillator to drive two application circuits (e.g. mixer
and PLL) simultaneously. The high output-to-output iso-
lation ensures minimal interaction between multiple
load circuits.
Layout and Power-Supply BypassingA properly designed PC board is essential to any RF/
microwave circuit. Be sure to use controlled impedance
lines on all high-frequency inputs and outputs. Bypass
the power supply with decoupling capacitors as close to
the VCCpins as possible. For long VCClines (inductive), it
may be necessary to add additional decoupling capaci-
tors located further away from the device package.
Proper grounding of GND is essential. If the PC board
uses a topside RF ground, connect GND directly to it.
For a board where the ground plane is not on the com-
ponent side, the best technique is to connect GND to
the board with a plated through-hole (via) to the ground
plane close to the package.
0MHz to 500MHz VCO Buffer Amplifiers ith Differential Outputs
Pin DescriptionDifferential Noninverting Buffer Output. Broadband 50Ωoutput. AC coupling is required.
Do not DC couple to this pin.OUT1
PIN
MAX2471MAX2470
NAMERF Ground. Connect to the ground plane as close as possible to the IC to minimize
ground path inductance.GND2
Bias and Bandwidth Control Input. Connect to VCCto set internal bias for higher band-
width operation (10MHz to 500MHz). Connect to GND to set internal bias for lower band-
width operation (10MHz to 200MHz) and to reduce overall current consumption.
HI/LO4
Differential Inverting Buffer Output. Broadband 50Ωoutput. AC coupling is required. Do
not DC couple to this pin.OUT3Differential Inverting Buffer Input. High impedance input to buffer amplifier. See Setting
The Input Impedancesection.IN—Supply Voltage Input. +2.7V < VCC< +5.5V.VCC6
Differential Noninverting Buffer Input. High impedance to buffer amplifier. See Setting The
Input Impedancesection.IN5
FUNCTION
