EVALUATION KIT AVAILABLE MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers General Description The MAX2680/MAX2681/MAX2682 miniature, low-cost, low-noise downconverter mixers are designed for lowvoltage operation and are ideal for use in portable communications equipment. Signals at the RF input port are mixed with signals at the local oscillator (LO) port using a double-balanced mixer. These downconverter mixers operate with RF input frequencies between 400MHz and 2500MHz, and downconvert to IF output frequencies between 10MHz and 500MHz. The MAX2680/MAX2681/MAX2682 operate from a single +2.7V to +5.5V supply, allowing them to be powered directly from a 3-cell NiCd or a 1-cell Lithium battery. These devices offer a wide range of supply currents and input intercept (IIP3) levels to optimize system performance. Additionally, each device features a low-power shutdown mode in which it typically draws less than 0.1A of supply current. Consult the Selector Guide for various combinations of IIP3 and supply current. The MAX2680/MAX2681/MAX2682 are manufactured on a high-frequency, low-noise, advanced silicon-germanium process and are offered in the space-saving 6-pin SOT23 package. Applications Features 400MHz to 2.5GHz Operation +2.7V to +5.5V Single-Supply Operation Low Noise Figure: 6.3dB at 900MHz (MAX2680) High Input Third-Order Intercept Point (IIP3 at 2450MHz) * -6.9dBm at 5.0mA (MAX2680) * +1.0dBm at 8.7mA (MAX2681) * +3.2dBm at 15.0mA (MAX2682) < 0.1A Low-Power Shutdown Mode Ultra-Small Surface-Mount Packaging Ordering Information 400MHz/900MHz/2.4GHz ISM-Band Radios Personal Communications Systems (PCS) Cellular and Cordless Phones Wireless Local Loop IEEE-802.11 and Wireless Data PART TEMP RANGE PINPACKAGE SOT TOP MARK MAX2680EUT-T -40C to +85C 6 SOT23 AAAR MAX2681EUT-T -40C to +85C 6 SOT23 AAAS MAX2682EUT-T -40C to +85C 6 SOT23 AAAT Selector Guide FREQUENCY PART ICC (mA) MAX2680 900MHz 1950MHz 2450MHz IIP3 (dBm) NF (dB) GAIN (dB) IIP3 (dBm) NF (dB) GAIN (dB) IIP3 (dBm) NF (dB) GAIN (dB) 5.0 -12.9 6.3 11.6 -8.2 8.3 7.6 -6.9 11.7 7.0 MAX2681 8.7 -6.1 7.0 14.2 +0.5 11.1 8.4 +1.0 12.7 7.7 MAX2682 15.0 -1.8 6.5 14.7 +4.4 10.2 10.4 +3.2 13.4 7.9 Typical Operating Circuit appears at end of data sheet. 19-4786; Rev 2; 8/03 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Absolute Maximum Ratings VCC to GND..........................................................-0.3V to +6.0V RFIN Input Power (50 source)......................................+10dBm LO Input Power (50 source).........................................+10dBm SHDN, IFOUT, RFIN to GND.................... -0.3V to (VCC + 0.3V) LO to GND....................................... (VCC - 1V) to (VCC + 0.3V) Continuous Power Dissipation (TA = +70C) SOT23 (derate 8.7mW/C above +70C).....................696mW Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +160C Lead Temperature (soldering, 10s).................................. +300C 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. CAUTION! ESD SENSITIVE DEVICE DC Electrical Characteristics (VCC = +2.7V to +5.5V, SHDN = +2V, TA = TMIN to TMAX unless otherwise noted. Typical values are at VCC = +3V and TA = +25C. Minimum and maximum values are guaranteed over temperature by design and characterization.) PARAMETER SYMBOL CONDITIONS MIN MAX2680 Operating Supply Current Shutdown Supply Current Shutdown Input Voltage High Shutdown Input Voltage Low Shutdown Input Bias Current TYP MAX 5.0 7.7 ICC MAX2681 8.7 12.7 MAX2682 15.0 21.8 ICC SHDN = 0.5V VIH VIL ISHDN 0.05 mA A 2.0 V 0.5 0 < SHDN < VCC UNITS 0.2 V A AC Electrical Characteristics (MAX2680/1/2 EV Kit, VCC = SHDN = +3.0V, TA = +25C, unless otherwise noted. RFIN and IFOUT matched to 50. PLO = -5dBm, PRFIN = -25dBm.) PARAMETER CONDITIONS MIN TYP MAX UNITS MAX2680 RF Frequency Range (Notes 1, 2) 400 2500 MHz LO Frequency Range (Notes 1, 2) 400 2500 MHz IF Frequency Range (Notes 1, 2) 10 500 MHz fRF = 400MHz, fLO = 445MHz, fIF = 45MHz Conversion Power Gain Gain Variation Over Temperature Input Third-Order Intercept Point (Note 3) Noise Figure (Single Sideband) LO Input VSWR LO Leakage at IFOUT Port www.maximintegrated.com fRF = 900MHz, fLO = 970MHz, fIF = 70MHz fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz (Note 1) 7.3 11.6 5.7 7.6 fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz 7.0 fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz, TA = TMIN to TMAX (Note 1) 1.9 fRF = 900MHz, 901MHz, fLO = 970MHz, fIF = 70MHz -12.9 fRF = 2450MHz, 2451MHz, fLO = 2210MHz, fIF = 240MHz -6.9 fRF = 1950MHz, fLO = 2020MHz, fIF = 70MHz 8.3 fRF = 1950MHz, 1951MHz, fLO = 1880MHz, fIF = 70MHz -8.2 fRF = 900MHz, fLO = 970MHz, fIF = 70MHz 6.3 fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz 50 source impedance fLO = 1880MHz 8.6 2.4 dB dB dBm dB 11.7 1.5:1 -22 dBm Maxim Integrated 2 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers AC Electrical Characteristics (continued) (MAX2680/1/2 EV Kit, VCC = SHDN = +3.0V, TA = +25C, unless otherwise noted. RFIN and IFOUT matched to 50. PLO = -5dBm, PRFIN = -25dBm.) PARAMETER LO Leakage at RFIN Port IF/2 Spurious Response MAX2681 CONDITIONS MIN fLO = 1880MHz fRF = 1915MHz, fLO = 1880MHz, fIF = 70MHz (Note 4) TYP MAX UNITS -26 dBm -51 dBm RF Frequency Range (Notes 1, 2) 400 2500 MHz LO Frequency Range (Notes 1, 2) 400 2500 MHz IF Frequency Range (Notes 1, 2) 10 500 MHz fRF = 400MHz, fLO = 445MHz, fIF = 45MHz Conversion Power Gain Gain Variation Over Temperature Input Third-Order Intercept Point (Note 3) Noise Figure (Single Sideband) LO Input VSWR LO Leakage at IFOUT Port LO Leakage at RFIN Port IF/2 Spurious Response MAX2682 fRF = 900MHz, fLO = 970MHz, fIF = 70MHz fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz (Note 1) 11.0 14.2 6.7 8.4 fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz 7.7 fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz, TA = TMIN to TMAX (Note 1) 1.7 fRF = 900MHz, 901MHz, fLO = 970MHz, fIF = 70MHz -6.1 fRF = 1950MHz, 1951MHz, fLO = 1880MHz, fIF = 70MHz 9.4 2.3 +0.5 fRF = 2450MHz, 2451MHz, fLO = 2210MHz, fIF = 240MHz +1.0 fRF = 1950MHz, fLO = 2020MHz, fIF = 70MHz 11.1 fRF = 900MHz, fLO = 970MHz, fIF = 70MHz dB dB dBm 7.0 fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz dB 12.7 50 source impedance 1.5:1 fLO = 1880MHz -23 dBm -27 dBm fRF = 1915MHz, fLO = 1880MHz, fIF = 70MHz (Note 4) -65 dBm fLO = 1880MHz RF Frequency Range (Notes 1, 2) 400 2500 MHz LO Frequency Range (Notes 1, 2) 400 2500 MHz IF Frequency Range (Notes 1, 2) 10 500 MHz fRF = 400MHz, fLO = 445MHz, fIF = 45MHz Conversion Power Gain Gain Variation Over Temperature Input Third-Order Intercept Point (Note 3) Noise Figure (Single Sideband) fRF = 900MHz, fLO = 970MHz, fIF = 70MHz fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz (Note 1) 14.7 8.7 10.4 fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz 7.9 fRF = 1950MHz, fLO = 1880MHz, fIF = 70MHz, TA = TMIN to TMAX (Note 1) 2.1 fRF = 900MHz, 901MHz, fLO = 970MHz, fIF = 70MHz fRF = 1950MHz, 1951MHz, fLO = 1880MHz, fIF = 70MHz +3.2 fRF = 1950MHz, fLO = 2020MHz, fIF = 70MHz 10.2 fRF = 900MHz, fLO = 970MHz, fIF = 70MHz 11.7 3.2 dB dB -1.8 +4.4 fRF = 2450MHz, 2451MHz, fLO = 2210MHz, fIF = 240MHz fRF = 2450MHz, fLO = 2210MHz, fIF = 240MHz www.maximintegrated.com 13.4 dBm 6.5 dB 13.4 Maxim Integrated 3 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers AC Electrical Characteristics (continued) (MAX2680/1/2 EV Kit, VCC = SHDN = +3.0V, TA = +25C, unless otherwise noted. RFIN and IFOUT matched to 50. PLO = -5dBm, PRFIN = -25dBm.) PARAMETER CONDITIONS MIN TYP MAX UNITS LO Input VSWR 50 source impedance LO Leakage at IFOUT Port fLO = 1880MHz -23 dBm -27 dBm fRF = 1915MHz, fLO = 1880MHz, fIF = 70MHz (Note 4) -61 dBm LO Leakage at RFIN Port fLO = 1880MHz IF/2 Spurious Response Note Note Note Note 1: 2: 3: 4: 1.5:1 Guaranteed by design and characterization. Operation outside of this specification is possible, but performance is not characterized and is not guaranteed. Two input tones at -25dBm per tone. This spurious response is caused by a higher-order mixing product (2x2). Specified RF frequency is applied and IF output power is observed at the desired IF frequency (70MHz). Typical Operating Characteristics (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25C, unless otherwise noted.) TA = +85C TA = +25C 5 4 TA = -40C TA = +85C 9 8 TA = +25C TA = -40C 7 3 6 2 5 18 MAX2682 SUPPLY CURRENT vs. SUPPLY VOLTAGE 17 SHDN = VCC TA = +85C 16 MAX2680/1/2-03 SHDN = VCC SUPPLY CURRENT (mA) 6 10 MAX2680/1/2-01 SHDN = VCC SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 7 MAX2681 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX2680/1/2-02 MAX2680 SUPPLY CURRENT vs. SUPPLY VOLTAGE 15 14 13 TA = +25C TA = -40C 12 11 10 9 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) www.maximintegrated.com 5.0 5.5 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 8 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) Maxim Integrated 4 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25C, unless otherwise noted.) TA = +85C TA = +25C 0.06 0.05 0.04 TA = -40C 0.03 0.02 0.01 0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C 0.06 TA = +85C 0.05 0.04 TA = -40C 0.03 0.02 0.01 2.5 3.0 3.5 4.0 4.5 5.0 SHDN = GND 0.09 0.08 0.07 TA = +85C TA = +25C 0.06 0.05 0.04 0.03 TA = -40C 0.02 0.01 0 5.5 MAX2680/1/2-06 0.10 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) MAX2680 CONVERSION POWER GAIN vs. LO POWER MAX2681 CONVERSION POWER GAIN vs. LO POWER MAX2682 CONVERSION POWER GAIN vs. LO POWER 9 fRF = 2450MHz fRF = 1950MHz 7 5 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 3 1 -1 -14 -12 -10 -8 -6 -4 -2 10 fRF = 1950MHz 8 fRF = 2450MHz 6 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 4 2 -14 -12 -10 -8 -6 -4 -2 fRF = 900MHz 14 12 fRF = 1950MHz 10 8 fRF = 2450MHz 6 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 4 2 0 0 MAX2680/1/2-09 12 0 0 fRF = 900MHz 14 16 CONVERSION POWER GAIN (dB) 11 MAX2680/1/2-08 fRF = 900MHz 13 16 CONVERSION POWER GAIN (dB) MAX2680/1/2-07 -14 -12 -10 -8 -6 -4 -2 0 LO POWER (dBm) LO POWER (dBm) MAX2680 CONVERSION POWER GAIN vs. TEMPERATURE MAX2681 CONVERSION POWER GAIN vs. TEMPERATURE MAX2682 CONVERSION POWER GAIN vs. TEMPERATURE fRF = 900MHz 12 10 fRF = 1950MHz 8 fRF = 2450MHz 6 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 1880MHz 70MHz 2450MHz 2210MHz 240MHz 4 2 0 -40 -20 0 20 40 60 TEMPERATURE (C) www.maximintegrated.com 80 100 16 fRF = 900MHz 14 12 10 fRF = 1950MHz 8 fRF = 2450MHz 6 4 2 0 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 17 CONVERSION POWER GAIN (dB) 14 MAX2680/1/2-10 16 fRF = 900MHz 15 13 MAX2680/1/2-12 LO POWER (dBm) MAX2680/1/2-11 CONVERSION POWER GAIN (dB) 0.07 MAX2682 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) 15 CONVERSION POWER GAIN (dB) 0.08 0 5.5 SHDN = GND 0.09 SHUTDOWN SUPPLY CURRENT (A) 0.07 MAX2680/1/2-05 0.08 MAX2681 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 0.10 SHUTDOWN SUPPLY CURRENT (A) SHDN = GND 0.09 CONVERSION POWER GAIN (dB) SHUTDOWN SUPPLY CURRENT (A) 0.10 MAX2680/1/2-04 MAX2680 SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE fRF = 1950MHz 11 9 7 fRF = 2450MHz 5 3 1 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Maxim Integrated 5 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25C, unless otherwise noted.) -9 16 -12 -10 -8 -6 -10 -8 MAX2680/1/2-15 MAX2680/1/2-14 -12 -6 -4 -2 0 0 -14 -12 -10 -8 -6 -4 -2 MAX2680 NOISE FIGURE vs. LO POWER MAX2681 NOISE FIGURE vs. LO POWER MAX2682 NOISE FIGURE vs. LO POWER 20 18 16 NOISE FIGURE (dB) fRF = 2450MHz 12 fRF = 1950MHz 10 8 fRF = 900MHz 6 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 2 -14 -14 LO POWER (dBm) -12 -10 -8 -6 -4 -2 14 fRF = 2450MHz 12 fRF = 1950MHz 10 8 fRF = 900MHz 6 2 0 0 25 -14 -12 -10 -8 -6 0 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 20 fRF fIF fLO 900MHz 970MHz 70MHz 1950MHz 2020MHz 70MHz 2450MHz 2210MHz 70MHz 4 15 fRF = 2450MHz fRF = 1950MHz 10 fRF = 900MHz 5 -4 -2 0 0 -14 -12 -10 -8 -6 -4 -2 0 LO POWER (dBm) LO POWER (dBm) LO POWER (dBm) MAX2680 RF PORT IMPEDANCE vs. RF FREQUENCY MAX2681 RF PORT IMPEDANCE vs. RF FREQUENCY MAX2682 RF PORT IMPEDANCE vs. RF FREQUENCY 250 300 -100 250 200 -200 150 -300 100 -400 50 0 REAL fLO = 970MHz PLO = -5dBm 0 500 1000 1500 RF FREQUENCY (MHz) www.maximintegrated.com -500 2000 -600 2500 MAX2680/1/2-20 IMAGINARY 0 300 -100 250 200 -200 150 -300 100 -400 50 0 fLO = 970MHz PLO = -5dBm 0 500 1000 1500 REAL -500 2000 -600 2500 RF FREQUENCY (MHz) REAL IMPEDANCE () IMAGINARY 0 IMAGINARY IMPEDANCE () MAX2680/1/2-19 REAL IMPEDANCE () 300 IMAGINARY IMPEDANCE (W) NOISE FIGURE (dB) -3 0 LO POWER (dBm) 4 REAL IMPEDANCE () -2 LO POWER (dBm) 14 0 -4 3 1 NOISE FIGURE (dB) -14 4 2 fRF = 1950MHz, 1951MHz fLO = 1880MHz fIF = 70MHz PRFIN = -25dBm PER TONE -2 MAX2680/1/2-16 -10 -1 5 MAX2680/1/2-21 IMAGINARY 0 -100 200 -200 150 -300 100 -400 50 0 REAL fLO = 970MHz PLO = -5dBm 0 500 1000 1500 2000 -500 -600 2500 RF FREQUENCY (MHz) Maxim Integrated 6 IMAGINARY IMPEDANCE () -8 0 fRF = 1950MHz, 1951MHz fLO = 1880MHz fIF = 70MHz PRFIN = -25dBm PER TONE 6 INPUT IP3 (dBm) -7 MAX2682 INPUT IP3 vs. LO POWER 7 MAX2680/1/2-17 INPUT IP3 (dBm) 1 INPUT IP3 (dBm) fRF = 1950MHz, 1951MHz fLO = 1880MHz fIF = 70MHz PRFIN = -25dBm PER TONE -6 2 MAX2680/1/2-13 -5 MAX2681 INPUT IP3 vs. LO POWER MAX2680/1/2-18 MAX2680 INPUT IP3 vs. LO POWER MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25C, unless otherwise noted.) IMAGINARY 600 -300 400 -400 200 -500 REAL 200 300 400 500 -600 IMAGINARY 600 -300 400 -400 200 -500 REAL 0 0 100 200 300 400 500 500 400 -250 200 -300 -600 0 200 300 400 -20 -25 -5 +5 0 RETURN LOSS (dB) -15 +10 -10 -15 -20 -25 -15 -20 -25 -30 -35 -35 -35 -40 -40 1880 2440 3000 200 760 1320 1880 2440 -40 3000 200 760 1320 1880 2440 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX2680 LO-to-IF AND LO-to-RF ISOLATION MAX2681 LO-to-IF AND LO-to-RF ISOLATION MAX2682 LO-to-IF AND LO-to-RF ISOLATION 35 30 ISOLATION (dB) 25 LO-to-RF ISOLATION 15 10 LO-to-IF ISOLATION 25 LO-to-RF ISOLATION 20 15 10 5 1000 1500 LO FREQUENCY (MHz) www.maximintegrated.com 2000 2500 0 LO-to-IF ISOLATION 30 3000 25 LO-to-RF ISOLATION 20 15 5 500 35 ISOLATION (dB) 30 40 MAX2680/1/2-29 LO-to-IF ISOLATION MAX2680/1/2-28 35 -400 -10 -30 1320 500 -5 -30 760 -350 MAX2680/1/2-27 0 RETURN LOSS (dB) -10 0 100 MAX2682 LO PORT RETURN LOSS 0 0 0 MAX2681 LO PORT RETURN LOSS -5 20 REAL 100 MAX2680 LO PORT RETURN LOSS +5 -200 300 IF FREQUENCY (MHz) +10 -150 IMAGINARY IF FREQUENCY (MHz) +5 200 -100 600 IF FREQUENCY (MHz) MAX2680/1/2-25 +10 100 -200 MAX2680/1/2-24 0 fLO = 970MHz PLO = -5dBm -50 700 MAX2680/1/2-26 0 800 -100 800 0 500 1000 1500 LO FREQUENCY (MHz) 2000 2500 10 0 500 1000 1500 2000 2500 LO FREQUENCY (MHz) Maxim Integrated 7 IMAGINARY IMPEDANCE () -200 0 MAX2682 IF PORT IMPEDANCE vs. IF FREQUENCY MAX2680/1/2-30 1000 MAX2680/1/2-23 fLO = 970MHz PLO = -5dBm REAL IMPEDANCE () -100 MAX2681 IF PORT IMPEDANCE vs. IF FREQUENCY IMAGINARY IMPEDANCE () 800 0 RETURN LOSS (dB) 1200 REAL IMPEDANCE () REAL IMPEDANCE () 1000 ISOLATION (dB) 0 MAX2680/1/2-22 fLO = 970MHz PLO = -5dBm IMAGINARY IMPEDANCE () 1200 MAX2680 IF PORT IMPEDANCE vs. IF FREQUENCY MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25C, unless otherwise noted.) SHDN 2V/div SHDN 2V/div IFOUT 50mV/ div IFOUT 50mV/ div SHDN 2V/div IFOUT 50mV/ div Z1 = 39pF Z1 = 39pF MAX2682 TURN-OFF/ON CHARACTERISTICS MAX2680/1/2-32 MAX2680/1/2-31 MAX2681 TURN-OFF/ON CHARACTERISTICS MAX2680/1/2-33 MAX2680 TURN-OFF/ON CHARACTERISTICS Z2 = 39pF 500ns/div 500ns/div 500ns/div Pin Configuration TOP VIEW LO 1 GND 2 MAX2680 MAX2681 MAX2682 RFIN 3 6 SHDN 5 VCC 4 IFOUT SOT23-6 Pin Description PIN NAME FUNCTION 1 LO 2 GND Mixer Ground. Connect to the ground plane with a low-inductance connection. 3 RFIN Radio Frequency Input. AC-couple to this pin with a DC-blocking capacitor. Nominal DC voltage is 1.5V. See the Applications Information section for details on impedance matching. 4 IFOUT 5 VCC 6 SHDN Local-Oscillator Input. Apply a local-oscillator signal with an amplitude of -10dBm to 0 (50 source). AC-couple this pin to the oscillator with a DC-blocking capacitor. Nominal DC voltage is VCC - 0.4V. Intermediate Frequency Output. Open-collector output requires an inductor to VCC. AC-couple to this pin with a DC-blocking capacitor. See the Applications Information section for details on impedance matching. Supply Voltage Input, +2.7V to +5.5V. Bypass with a capacitor to the ground plane. Capacitor value depends upon desired operating frequency. Active-Low Shutdown. Drive low to disable all device functions and reduce the supply current to less than 5A. For normal operation, drive high or connect to VCC. www.maximintegrated.com Maxim Integrated 8 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Detailed Description IF Output The MAX2680/MAX2681/MAX2682 are 400MHz to 2.5GHz, silicon-germanium, double-balanced downconverter mixers. They are designed to provide optimum linearity performance for a specified supply current. They consist of a double-balanced Gilbert-cell mixer with single-ended RF, LO, and IF port connections. An on-chip bias cell provides a low-power shutdown feature. Consult the Selector Guide for device features and comparison. Applications Information Local-Oscillator (LO) Input The LO input is a single-ended broadband port with a typical input VSWR of better than 2.0:1 from 400MHz to 2.5GHz. The LO signal is mixed with the RF input signal, and the resulting downconverted output appears at IFOUT. AC-couple LO with a capacitor. Drive the LO port with a signal ranging from -10dBm to 0 (50 source). RF Input The RF input frequency range is 400MHz to 2.5GHz. The RF input requires an impedance-matching network as well as a DC-blocking capacitor that can be part of the matching network. Consult Tables 1 and 2, as well as the RF Port Impedance vs. RF Frequency graph in the Typical Operating Characteristics section for information on matching. The IF output frequency range extends from 10MHz to 500MHz. IFOUT is a high-impedance, open-collector output that requires an external inductor to VCC for proper biasing. For optimum performance, the IF port requires an impedance-matching network. The configuration and values for the matching network is dependent upon the frequency and desired output impedance. For assistance in choosing components for optimal performance, see Table 3 and Table 4 as well as the IF Port Impedance vs. IF Frequency graph in the Typical Operating Characteristics section. Power-Supply and SHDN Bypassing Proper attention to voltage supply bypassing is essential for high-frequency RF circuit stability. Bypass VCC with a 10F capacitor in parallel with a 1000pF capacitor. Use separate vias to the ground plane for each of the bypass capacitors and minimize trace length to reduce inductance. Use separate vias to the ground plane for each ground pin. Use low-inductance ground connections. Decouple SHDN with a 1000pF capacitor to ground to minimize noise on the internal bias cell. Use a series resistor (typically 100) to reduce coupling of high-frequency signals into the SHDN pin. Layout Issues A well-designed PC board is an essential part of an RF circuit. For best performance, pay attention to powersupply issues as well as to the layout of the RFIN and IFOUT impedance-matching network. Table 1. RFIN Port Impedance PART FREQUENCY 400MHz 900MHz 1950MHz 2450MHz MAX2680 179-j356 54-j179 32-j94 33-j73 MAX2681 209-j332 75-j188 34-j108 33-j86 MAX2682 206-j306 78-j182 34-j106 29-j86 Table 2. RF Input Impedance-Matching Component Values FREQUENCY MATCHING COMPONENTS MAX2680 1950 MHz MAX2681 400 MHz 900 MHz 2450 MHz Z1 86nH 270pF 1.5pF Z2 270pF 22nH 270pF Z3 Open Open 1.8nH 1.8nH 1950 MHz MAX2682 400 MHz 900 MHz 2450 MHz 400 MHz 900 MHz 1950 MHz 2450 MHz Short 68nH 270pF 1.5pF Short 68nH 1.5pF Short Short 270pF 270pF 18nH 270pF 270pF 270pF 270pF 270pF 270pF 0.5pF Open 1.8nH 2.2nH 0.5pF 10nH 2.2nH 1.2nH Note: Z1, Z2, and Z3 are found in the Typical Operating Circuit. www.maximintegrated.com Maxim Integrated 9 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Table 3. IFOUT Port Impedance PART Power-Supply Layout To minimize coupling between different sections of the IC, the ideal power-supply layout is a star configuration with a large decoupling capacitor at a central VCC node. The VCC traces branch out from this central node, each going to a separate VCC node on the PC board. At the end of each trace is a bypass capacitor that has low ESR at the RF frequency of operation. This arrangement provides local decoupling at the VCC pin. At high frequencies, any signal leaking out of one supply pin sees a relatively high impedance (formed by the VCC trace inductance) to the central VCC node, and an even higher impedance to any other supply pin, as well as a low impedance to ground through the bypass capacitor. FREQUENCY 45MHz 70MHz 240MHz MAX2680 960-j372 803-j785 186-j397 MAX2681 934-j373 746-j526 161-j375 MAX2682 670-j216 578-j299 175-j296 Table 4. IF Output Impedance-Matching Components FREQUENCY MATCHING COMPONENT 45MHz 70MHz 240MHz L1 390nH 330nH 82nH C2 39pF 15pF 3pF R1 250 Open Open Impedance-Matching Network Layout The RFIN and IFOUT impedance-matching networks are very sensitive to layout-related parasitics. To minimize parasitic inductance, keep all traces short and place components as close as possible to the chip. To minimize parasitic capacitance, use cutouts in the ground plane (and any other plane) below the matching network components. However, avoid cutouts that are larger than necessary since they act as aperture antennas. Typical Operating Circuit C1 LO INPUT 1 2 SHDN LO C3 MAX2680 MAX2681 MAX2682 GND 6 VCC 5 L1 RF INPUT Z2 Z1 Z3 3 RFIN IFOUT SHUTDOWN CONTROL C4 1000pF R1 C5 10F VCC +2.7V TO +5.5V IF OUTPUT 4 C2 THE VALUES OF MATCHING COMPONENTS C2, L1, R1, Z1, Z2, AND Z3 DEPEND ON THE IF AND RF FREQUENCY AND DOWNCONVERTER. SEE TABLES 2 AND 4. www.maximintegrated.com Maxim Integrated 10 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. www.maximintegrated.com Maxim Integrated 11 MAX2680/MAX2681/ MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2003 Maxim Integrated Products, Inc. 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX2680EUT-T MAX2681EUT-T MAX2680AUT+T MAX2680EUT+T MAX2681EUT+T