400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers 400MHz 2.5GHz
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19-4786; 8/03
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
400MHz 2.5GHz Operation +2.7V +5.5V Single-Supply Operation Noise Figure: 6.3dB 900MHz (MAX2680) High Input Third-Order Intercept Point (IIP3 2450MHz) -6.9dBm 5.0mA (MAX2680) +1.0dBm 8.7mA (MAX2681) +3.2dBm 15.0mA (MAX2682) <0.1µA Low-Power Shutdown Mode Ultra-Small Surface-Mount Packaging
MAX2680/MAX2681/MAX2682
MAX2680/MAX2681/MAX2682 miniature, low-cost, low-noise downconverter mixers designed lowvoltage operation ideal portable communications equipment. Signals input port mixed with signals local oscillator (LO) port using double-balanced mixer. These downconverter mixers operate with input frequencies between 400MHz 2500MHz, downconvert output frequencies between 10MHz 500MHz. MAX2680/MAX2681/MAX2682 operate from single +2.7V +5.5V supply, allowing them powered directly from 3-cell NiCd 1-cell Lithium battery. These devices offer wide range supply currents input intercept (IIP3) levels optimize system performance. Additionally, each device features low-power shutdown mode which typically draws less than 0.1µA supply current. Consult Selector Guide various combinations IIP3 supply current. MAX2680/MAX2681/MAX2682 manufactured high-frequency, low-noise, advanced silicon-germanium process offered space-saving 6-pin SOT23 package.
Ordering Information
PART MAX2680EUT-T MAX2681EUT-T MAX2682EUT-T TEMP RANGE -40°C +85°C -40°C +85°C -40°C +85°C PINSOT PACKAGE MARK SOT23-6 SOT23-6 SOT23-6 AAAR AAAS AAAT
Applications
400MHz/900MHz/2.4GHz ISM-Band Radios Personal Communications Systems (PCS) Cellular Cordless Phones Wireless Local Loop IEEE-802.11 Wireless Data
Configuration
VIEW
SHDN
MAX2680 MAX2681 MAX2682
RFIN
IFOUT
Typical Operating Circuit appears data sheet.
SOT23-6
Selector Guide
FREQUENCY PART (mA) 900MHz IIP3 (dBm) -12.9 -6.1 -1.8 (dB) GAIN (dB) 11.6 14.2 14.7 IIP3 (dBm) -8.2 +0.5 +4.4 1950MHz (dB) 11.1 10.2 GAIN (dB) 10.4 IIP3 (dBm) -6.9 +1.0 +3.2 2450MHz (dB) 11.7 12.7 13.4 GAIN (dB)
MAX2680 MAX2681 MAX2682
15.0
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682
ABSOLUTE MAXIMUM RATINGS
.-0.3V +6.0V RFIN Input Power Source).+10dBm Input Power Source) .+10dBm SHDN, IFOUT, RFIN .-0.3V (VCC 0.3V) GND.(VCC (VCC 0.3V) Continuous Power Dissipation +70°C) SOT23-6 (derate 8.7mW/°C above +70°C).696mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability. CAUTION! SENSITIVE DEVICE
ELECTRICAL CHARACTERISTICS
(VCC +2.7V +5.5V, SHDN +2V, TMIN TMAX unless otherwise noted. Typical values +25°C. Minimum maximum values guaranteed over temperature design characterization.) PARAMETER Operating Supply Current Shutdown Supply Current Shutdown Input Voltage High Shutdown Input Voltage Shutdown Input Bias Current SYMBOL MAX2680 ISHDN SHDN MAX2681 MAX2682 SHDN 0.5V CONDITIONS 15.0 0.05 12.7 21.8 UNITS
ELECTRICAL CHARACTERISTICS
(MAX2680/1/2 Kit, SHDN +3.0V, +25°C, unless otherwise noted. RFIN IFOUT matched -5dBm, PRFIN -25dBm.) PARAMETER MAX2680 Frequency Range Frequency Range Frequency Range (Notes (Notes (Notes 400MHz, 445MHz, 45MHz Conversion Power Gain 900MHz, 970MHz, 70MHz 1950MHz, 1880MHz, 70MHz (Note 2450MHz, 2210MHz, 240MHz Gain Variation Over Temperature Input Third-Order Intercept Point (Note 1950MHz, 1880MHz, 70MHz, TMIN TMAX (Note 900MHz, 901MHz, 970MHz, 70MHz 1950MHz, 1951MHz, 1880MHz, 70MHz 2450MHz, 2451MHz, 2210MHz, 240MHz 900MHz, 970MHz, 70MHz Noise Figure (Single Sideband) Input VSWR Leakage IFOUT Port 1950MHz, 2020MHz, 70MHz 2450MHz, 2210MHz, 240MHz source impedance 1880MHz 11.6 -12.9 -8.2 -6.9 11.7 1.5:1 2500 2500 CONDITIONS UNITS
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
ELECTRICAL CHARACTERISTICS (continued)
(MAX2680/1/2 Kit, SHDN +3.0V, +25°C, unless otherwise noted. RFIN IFOUT matched -5dBm, PRFIN -25dBm.) PARAMETER Leakage RFIN Port IF/2 Spurious Response MAX2681 Frequency Range Frequency Range Frequency Range (Notes (Notes (Notes 400MHz, 445MHz, 45MHz Conversion Power Gain 900MHz, 970MHz, 70MHz 1950MHz, 1880MHz, 70MHz (Note 2450MHz, 2210MHz, 240MHz Gain Variation Over Temperature Input Third-Order Intercept Point (Note 1950MHz, 1880MHz, 70MHz, TMIN TMAX (Note 900MHz, 901MHz, 970MHz, 70MHz 1950MHz, 1951MHz, 1880MHz, 70MHz 2450MHz, 2451MHz, 2210MHz, 240MHz 900MHz, 970MHz, 70MHz Noise Figure (Single Sideband) Input VSWR Leakage IFOUT Port Leakage RFIN Port IF/2 Spurious Response MAX2682 Frequency Range Frequency Range Frequency Range (Notes (Notes (Notes 400MHz, 445MHz, 45MHz Conversion Power Gain 900MHz, 970MHz, 70MHz 1950MHz, 1880MHz, 70MHz (Note 2450MHz, 2210MHz, 240MHz Gain Variation Over Temperature Input Third-Order Intercept Point (Note 1950MHz, 1880MHz, 70MHz, TMIN TMAX (Note 900MHz, 901MHz, 970MHz, 70MHz 1950MHz, 1951MHz, 1880MHz, 70MHz 2450MHz, 2451MHz, 2210MHz, 240MHz 900MHz, 970MHz, 70MHz Noise Figure (Single Sideband) 1950MHz, 2020MHz, 70MHz 2450MHz, 2210MHz, 240MHz 13.4 14.7 10.4 -1.8 +4.4 +3.2 10.2 13.4 11.7 2500 2500 1950MHz, 2020MHz, 70MHz 2450MHz, 2210MHz, 240MHz source impedance 1880MHz 1880MHz 1915MHz, 1880MHz, 70MHz (Note 11.0 14.2 -6.1 +0.5 +1.0 11.1 12.7 1.5:1 2500 2500 1880MHz 1915MHz, 1880MHz, 70MHz (Note CONDITIONS UNITS
MAX2680/MAX2681/MAX2682
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682
ELECTRICAL CHARACTERISTICS (continued)
(MAX2680/1/2 Kit, SHDN +3.0V, +25°C, unless otherwise noted. RFIN IFOUT matched -5dBm, PRFIN -25dBm.) PARAMETER Input VSWR Leakage IFOUT Port Leakage RFIN Port IF/2 Spurious Response Note Note Note Note 1880MHz 1880MHz 1915MHz, 1880MHz, 70MHz (Note CONDITIONS source impedance 1.5:1 UNITS
Guaranteed design characterization. Operation outside this specification possible, performance characterized guaranteed. input tones -25dBm tone. This spurious response caused higher-order mixing product (2x2). Specified frequency applied output power observed desired frequency (70MHz).
Typical Operating Characteristics
(Typical Operating Circuit, SHDN +3.0V, PRFIN -25dBm, -5dBm, +25°C, unless otherwise noted.)
MAX2680 SUPPLY CURRENT SUPPLY VOLTAGE
MAX2680/1/2-01
MAX2681 SUPPLY CURRENT SUPPLY VOLTAGE
MAX2680/1/2-02
MAX2682 SUPPLY CURRENT SUPPLY VOLTAGE
SUPPLY CURRENT (mA) +25°C -40°C +85°C SHDN
MAX2680/1/2-03
SHDN SUPPLY CURRENT (mA) +85°C +25°C
SHDN SUPPLY CURRENT (mA) +85°C
+25°C -40°C
-40°C
SUPPLY VOLTAGE
SUPPLY VOLTAGE
SUPPLY VOLTAGE
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
Typical Operating Characteristics (continued)
(Typical Operating Circuit, SHDN +3.0V, PRFIN -25dBm, -5dBm, +25°C, unless otherwise noted.)
MAX2680 SHUTDOWN SUPPLY CURRENT SUPPLY VOLTAGE
MAX2680/1/2-04
MAX2680/MAX2681/MAX2682
MAX2681 SHUTDOWN SUPPLY CURRENT SUPPLY VOLTAGE
MAX2680/1/2-05
MAX2682 SHUTDOWN SUPPLY CURRENT SUPPLY VOLTAGE
SHUTDOWN SUPPLY CURRENT (µA) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 -40°C +25°C +85°C SHDN
MAX2680/1/2-06
0.10 SHUTDOWN SUPPLY CURRENT (µA) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 -40°C +25°C +85°C SHDN
0.10 SHUTDOWN SUPPLY CURRENT (µA) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 -40°C +25°C +85°C SHDN
0.10
SUPPLY VOLTAGE
SUPPLY VOLTAGE
SUPPLY VOLTAGE
MAX2680 CONVERSION POWER GAIN POWER
MAX2680/1/2-07
MAX2681 CONVERSION POWER GAIN POWER
MAX2680/1/2-08
MAX2682 CONVERSION POWER GAIN POWER
CONVERSION POWER GAIN (dB) 2450MHz 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 900MHz 1950MHz
MAX2680/1/2-09
CONVERSION POWER GAIN (dB) 1950MHz POWER (dBm) 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 2450MHz 900MHz
CONVERSION POWER GAIN (dB) POWER (dBm) 2450MHz 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 1950MHz 900MHz
POWER (dBm)
MAX2680 CONVERSION POWER GAIN TEMPERATURE
MAX2680/1/2-10
MAX2681 CONVERSION POWER GAIN TEMPERATURE
MAX2680/1/2-11
MAX2682 CONVERSION POWER GAIN TEMPERATURE
CONVERSION POWER GAIN (dB) 2450MHz 1950MHz 900MHz
MAX2680/1/2-12
CONVERSION POWER GAIN (dB) 2450MHz 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 1950MHz 900MHz
CONVERSION POWER GAIN (dB) 2450MHz 1950MHz 900MHz
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682
Typical Operating Characteristics (continued)
(Typical Operating Circuit, SHDN +3.0V, PRFIN -25dBm, -5dBm, +25°C, unless otherwise noted.)
MAX2680 INPUT POWER
MAX2680/1/2-13
MAX2681 INPUT POWER
MAX2680/1/2-14
MAX2682 INPUT POWER
1950MHz, 1951MHz 1880MHz 70MHz PRFIN -25dBm TONE
MAX2680/1/2-15
1950MHz, 1951MHz 1880MHz 70MHz PRFIN -25dBm TONE
INPUT (dBm)
INPUT (dBm)
INPUT (dBm) 1950MHz, 1951MHz 1880MHz 70MHz PRFIN -25dBm TONE
POWER (dBm)
POWER (dBm)
POWER (dBm)
MAX2680 NOISE FIGURE POWER
MAX2680/1/2-16
MAX2681 NOISE FIGURE POWER
MAX2680/1/2-17
MAX2682 NOISE FIGURE POWER
900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 2450MHz 1950MHz 900MHz
MAX2680/1/2-18
NOISE FIGURE (dB) POWER (dBm) 900MHz 900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 2450MHz 1950MHz
NOISE FIGURE (dB) POWER (dBm) 900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 900MHz 2450MHz 1950MHz
NOISE FIGURE (dB)
POWER (dBm)
MAX2680 PORT IMPEDANCE FREQUENCY
REAL IMPEDANCE 1000 1500 2000 FREQUENCY (MHz) REAL
MAX2680/1/2-19
MAX2681 PORT IMPEDANCE FREQUENCY
-100 -200 -300 -400 -500 REAL IMPEDANCE 1000 1500 2000 FREQUENCY (MHz) REAL IMAGINARY
MAX2680/1/2-20
MAX2682 PORT IMPEDANCE FREQUENCY
-100 -200 -300 -400 -500 REAL IMPEDANCE 1000 1500 2000 FREQUENCY (MHz) 970MHz -5dBm REAL IMAGINARY
MAX2680/1/2-21
-100 -200 -300 -400 -500
IMAGINARY IMAGINARY IMPEDANCE IMAGINARY IMPEDANCE IMAGINARY IMPEDANCE
970MHz -5dBm
-600 2500
970MHz -5dBm
-600 2500
-600 2500
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
Typical Operating Characteristics (continued)
(Typical Operating Circuit, SHDN +3.0V, PRFIN -25dBm, -5dBm, +25°C, unless otherwise noted.)
MAX2680/MAX2681/MAX2682
MAX2680 PORT IMPEDANCE FREQUENCY
1200 1000 REAL IMPEDANCE FREQUENCY (MHz) REAL
MAX2680/1/2-22
MAX2681 PORT IMPEDANCE FREQUENCY
-100 -200 -300 -400 -500 -600 1200 1000 FREQUENCY (MHz) REAL
MAX2680/1/2-23
MAX2682 PORT IMPEDANCE FREQUENCY
-100 -200 -300 -400 -500 -600 IMAGINARY IMPEDANCE REAL IMPEDANCE FREQUENCY (MHz) REAL IMAGINARY -200 -250 -300 -350 -400
MAX2680/1/2-24 970MHz -5dBm
970MHz -5dBm
970MHz -5dBm IMAGINARY IMPEDANCE REAL IMPEDANCE
-100 -150
IMAGINARY
IMAGINARY
MAX2680 PORT RETURN LOSS
MAX2680/1/2-25
MAX2681 PORT RETURN LOSS
MAX2680/1/2-26
MAX2682 PORT RETURN LOSS
RETURN LOSS (dB)
MAX2680/1/2-27
RETURN LOSS (dB) 1320 1880 2440
RETURN LOSS (dB)
3000
1320
1880
2440
3000
1320
1880
2440
3000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2680 LO-to-IF LO-to-RF ISOLATION
MAX2680/1/2-28
MAX2681 LO-to-IF LO-to-RF ISOLATION
ISOLATION (dB) 1000 1500 2000 2500 LO-to-RF ISOLATION ISOLATION (dB) LO-to-IF ISOLATION
MAX2680/1/2-29
MAX2682 LO-to-IF LO-to-RF ISOLATION
MAX2680/1/2-30
ISOLATION (dB) 1000 1500 2000 LO-to-RF ISOLATION LO-to-IF ISOLATION
LO-to-IF ISOLATION
LO-to-RF ISOLATION
2500
1000
1500
2000
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
IMAGINARY IMPEDANCE
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682
Typical Operating Characteristics (continued)
(Typical Operating Circuit, SHDN +3.0V, PRFIN -25dBm, -5dBm, +25°C, unless otherwise noted.)
MAX2680 TURN-OFF/ON CHARACTERISTICS
MAX2680/1/2-31
MAX2681 TURN-OFF/ON CHARACTERISTICS
MAX2680/1/2-32
MAX2682 TURN-OFF/ON CHARACTERISTICS
SHDN 2V/div
MAX2680/1/2-33
SHDN 2V/div
SHDN 2V/div
IFOUT 50mV/
IFOUT 50mV/
IFOUT 50mV/
39pF 500ns/div
39pF 500ns/div
39pF 500ns/div
Description
NAME RFIN IFOUT SHDN FUNCTION Local-Oscillator Input. Apply local-oscillator signal with amplitude -10dBm source). ACcouple this oscillator with DC-blocking capacitor. Nominal voltage 0.4V. Mixer Ground. Connect ground plane with low-inductance connection. Radio Frequency Input. AC-couple this with DC-blocking capacitor. Nominal voltage 1.5V. Applications Information section details impedance matching. Intermediate Frequency Output. Open-collector output requires inductor VCC. AC-couple this with DC-blocking capacitor. Applications Information section details impedance matching. Supply Voltage Input, +2.7V +5.5V. Bypass with capacitor ground plane. Capacitor value depends upon desired operating frequency. Active-Low Shutdown. Drive disable device functions reduce supply current less than 5µA. normal operation, drive high connect VCC.
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
Detailed Description
MAX2680/MAX2681/MAX2682 400MHz 2.5GHz, silicon-germanium, double-balanced downconverter mixers. They designed provide optimum linearity performance specified supply current. They consist double-balanced Gilbert-cell mixer with single-ended port connections. on-chip bias cell provides low-power shutdown feature. Consult Selector Guide device features comparison.
Output
output frequency range extends from 10MHz 500MHz. IFOUT high-impedance, open-collector output that requires external inductor proper biasing. optimum performance, port requires impedance-matching network. configuration values matching network dependent upon frequency desired output impedance. assistance choosing components optimal performance, refer Tables well Port Impedance Frequency graph Typical Operating Characteristics.
MAX2680/MAX2681/MAX2682
Applications Information
Local-Oscillator (LO) Input
input single-ended broadband port with typical input VSWR better than 2.0:1 from 400MHz 2.5GHz. signal mixed with input signal, resulting downconverted output appears IFOUT. AC-couple with capacitor. Drive port with signal ranging from -10dBm source).
Power-Supply SHDN Bypassing
Proper attention voltage supply bypassing essential high-frequency circuit stability. Bypass with 10µF capacitor parallel with 1000pF capacitor. separate vias ground plane each bypass capacitors minimize trace length reduce inductance. separate vias ground plane each ground pin. low-inductance ground connections. Decouple SHDN with 1000pF capacitor ground minimize noise internal bias cell. series resistor (typically 100) reduce coupling high-frequency signals into SHDN pin.
Input
input frequency range 400MHz 2.5GHz. input requires impedance-matching network well DC-blocking capacitor that part matching network. Consult Tables well Port Impedance Frequency graph Typical Operating Characteristics information matching.
Layout Issues
well designed board essential part circuit. best performance, attention powersupply issues well layout RFIN IFOUT impedance-matching network.
Table RFIN Port Impedance
FREQUENCY PART 400MHz MAX2680 MAX2681 MAX2682 179-j356 209-j332 206-j306 900MHz 54-j179 75-j188 78-j182 1950MHz 32-j94 34-j108 34-j106 2450MHz 33-j73 33-j86 29-j86
Table Input Impedance-Matching Component Values
FREQUENCY MATCHING COMPONENTS MAX2680 86nH 270pF Open 270pF 22nH Open 1950 1.5pF 270pF 1.8nH 2450 Short 270pF 1.8nH 68nH 270pF 0.5pF MAX2681 270pF 18nH Open 1950 1.5pF 270pF 1.8nH 2450 Short 270pF 2.2nH 68nH 270pF 0.5pF MAX2682 1.5pF 270pF 10nH 1950 Short 270pF 2.2nH 2450 Short 270pF 1.2nH
Note: found Typical Operating Circuit.
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682
Table IFOUT Port Impedance
FREQUENCY PART 45MHz MAX2680 MAX2681 MAX2682 960-j372 934-j373 670-j216 70MHz 803-j785 746-j526 578-j299 240MHz 186-j397 161-j375 175-j296
Power-Supply Layout
minimize coupling between different sections ideal power-supply layout star configuration with large decoupling capacitor central node. traces branch from this central node, each going separate node board. each trace bypass capacitor that frequency operation. This arrangement provides local decoupling pin. high frequencies, signal leaking supply sees relatively high impedance (formed trace inductance) central node, even higher impedance other supply pin, well impedance ground through bypass capacitor.
Table Output Impedance-Matching Components
MATCHING COMPONENT FREQUENCY 45MHz 390nH 39pF 70MHz 330nH 15pF Open 240MHz 82nH Open
Impedance-Matching Network Layout
RFIN IFOUT impedance-matching networks very sensitive layout-related parasitics. minimize parasitic inductance, keep traces short place components close possible chip. minimize parasitic capacitance, cutouts ground plane (and other plane) below matching network components. However, avoid cutouts that larger than necessary since they aperture antennas.
Typical Operating Circuit
INPUT SHDN SHUTDOWN CONTROL
MAX2680 MAX2681 MAX2682
1000pF 10µF
+2.7V +5.5V
INPUT
RFIN
IFOUT
OUTPUT
VALUES MATCHING COMPONENTS DEPEND FREQUENCY DOWNCONVERTER. TABLES
400MHz 2.5GHz, Low-Noise, SiGe Downconverter Mixers
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT-23,
21-0058
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
6LSOT.EPS
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