19-1620; Rev 1; 5/01 KIT ATION EVALU E L B AVAILA 3.5GHz Downconverter Mixers with Selectable LO Doubler The MAX2683/MAX2684 are super-high-performance, low-cost downconverter mixers intended for wireless local loop (WLL) and digital microwave radio (DMR) applications in the 3.4GHz to 3.8GHz frequency band. The MAX2683 is optimized for downconversion to IF frequencies between 100MHz and 400MHz, and allows both high-side and low-side local oscillator (LO) injection. The MAX2684 is optimized for IF frequencies between 800MHz and 1000MHz, and allows low-side LO injection. A logic-level control enables an internal frequency doubler on both devices, allowing the external LO source to run at full or half frequency. An internal LO filter reduces LO harmonics and spurious mixing. The MAX2683/MAX2684 feature an externally adjustable bias control, set with a single resistor, that lets the user trade supply current for linearity to optimize system performance. These devices use a double-balanced Gilbert-cell architecture with single-ended RF and LO inputs and differential open-collector IF output ports. Differential IF ports provide a wideband, flexible interface for either single-ended or differential applications. The MAX2683/MAX2684 operate from a single +2.7V to +5.5V supply. The devices are packaged in an ultrasmall 16-pin TSSOP-EP package with an exposed paddle for optimum performance at 3.5GHz. ________________________Applications ♦ 3.4GHz to 3.8GHz RF Frequency Range ♦ 100MHz to 400MHz IF Frequency Range (MAX2683) 800MHz to 1000MHz IF Frequency Range (MAX2684) ♦ Logic-Enabled LO Frequency Doubler ♦ Conversion Gain +6.7dB (MAX2683) +1dB (MAX2684) ♦ Programmable IIP3 +7dBm to +11dBm (MAX2683) +8dBm to +12dBm (MAX2684) ♦ +2.7V to +5.5V Single-Supply Operation ♦ Ultra-Small 16-Pin TSSOP-EP Package Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX2683EUE -40°C to +85°C 16 TSSOP-EP* MAX2684EUE -40°C to +85°C 16 TSSOP-EP* *Exposed pad Wireless Local Loop (WLL) Digital Microwave Radio (DMR) Typical Operating Circuit appears at end of data sheet. Wireless Broadband Access Pin Configuration Functional Diagram TOP VIEW IFOUT+ RFIN IFOUT- VCC BIAS BIAS VCC 1 16 BIAS GND 2 15 GND GND 3 14 IFOUT+ RFIN 4 GND LO BUFFER GND 5 x1 MAX2683 MAX2684 LOX1 LO DOUBLER x2 LOX2 ENX2 MAX2683 MAX2684 13 GND 12 GND ENX2 6 11 IFOUT- LOX2 7 10 GND LOX1 8 9 GND TSSOP-EP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX2683/MAX2684 Features General Description MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +6.0V IFOUT+, IFOUT-, ENX2, BIAS to GND .......-0.3V to (VCC + 0.3V) RFIN Input Power (50Ω source) .....................................+10dBm LO Input Power (50Ω source) ........................................+10dBm RBIAS .............................................................................820Ω min Continuous Power Dissipation (TA = +70°C) 16-pin TSSOP-EP (derate 21.3mW/°C above +70°C).............................................................1702mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range ..............................-65°C to+150°C Lead Temperature (soldering, 10s) .................................+300°C 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. DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V; RBIAS = 1.2kΩ; ENX2 = GND; RFIN, LOX1, and LOX2 are terminated in 50Ω, no input signal applied; IFOUT+ = IFOUT- = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN Supply Current Supply Current Reduction when LO Doubler is Disabled ENX2 = VCC TYP MAX UNITS 55 66 mA 15 mA 2.0 Input Logic Voltage High V Input Logic Voltage Low -20 Input Logic Bias Current 0.6 V 10 µA AC ELECTRICAL CHARACTERISTICS—MAX2683 (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX UNITS 3.8 GHz 100 400 MHz 1.5 1.95 GHz ENX2 = VCC (Notes 2, 3) 3.0 3.9 GHz Conversion Gain (Notes 1, 4) 4.8 6.7 8.0 dB Gain Variation Over Temperature TA = -40°C to +85°C (Note 2) ±0.5 ±1.2 dB PARAMETER CONDITIONS MIN RF Frequency Range (Notes 2, 3) 3.4 IF Frequency Range (Notes 2, 3) LOX2 Frequency Range ENX2 = GND (Notes 2, 3) LOX1 Frequency Range TYP Input 1dB Compression Point +0.8 dBm Input Third-Order Intercept Point (Note 5) +8.8 dBm Input Second-Order Intercept Point (Note 6) +33 dBm Noise Figure RFIN Input Return Loss (Note 7) (Note 8) dB dB fRFIN = 1 × fLO 12 -18 -42 fRFIN = 2 × fLO -38 dBm fRFIN = 3 × fLO -49 ENX2 = VCC, fRFIN = 1 × fLO, fLOX1 = 3.3GHz -39 LOX2 Leakage at RFIN LOX1 Leakage at RFIN 2 ENX2 = GND _______________________________________________________________________________________ dBm 3.5GHz Downconverter Mixers with Selectable LO Doubler (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP fIFOUT = 1 × fLO -39 MAX UNITS LOX2 Leakage at IFOUT+, IFOUT- ENX2 = GND fIFOUT = 2 × fLO fIFOUT = 3 × fLO -39 -64 dBm LOX1 Leakage at IFOUT+, IFOUT- ENX2 = VCC, fIFOUT = 1 × fLO, fLOX1 = 3.3GHz -39 dBm LOX1, LOX2 Input Return Loss (Note 9) -20 dB AC ELECTRICAL CHARACTERISTICS—MAX2684 (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1350MHz, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS RF Frequency Range (Notes 2, 3) 3.4 3.8 GHz IF Frequency Range (Notes 2, 3) 800 1000 MHz LOX2 Frequency Range LOX2 = GND (Notes 2, 3) 1.2 1.45 GHz LOX1 Frequency Range LOX2 = VCC (Notes 2, 3) 2.4 Conversion Gain (Notes 1, 4) -0.8 Gain Variation Over Temperature and Frequency TA = -40°C to +85°C Input 1dB Compression Point 2.9 GHz +1 +2.3 dB ±0.5 ±1.2 dB 0 dBm Input Third-Order Intercept Point (Note 10) +9.5 dBm Input Second-Order Intercept Point (Note 11) +37 dBm Noise Figure RFIN Input Return Loss (Note 7) (Note 8) dB dB LOX2 Leakage at RFIN ENX2 = GND fRFIN = 1 × fLOX2 fRFIN = 2 × fLOX2 fRFIN = 3 × fLOX2 13.6 -18 -47 -43 -49 LOX1 Leakage at RFIN ENX2 = VCC, fRFIN = 1 × fLOX1, fLOX1 = 2.7GHz -45 dBm fRFIN = 1 × fLOX2 fRFIN = 2 × fLOX2 fRFIN = 3 × fLOX2 -37 -20 -41 dBm dBm LOX2 Leakage at IFOUT+, IFOUT- ENX2 = GND LOX1 Leakage at IFOUT+, IFOUT- ENX2 = VCC, fIFOUT = 1 × fLOX1, fLOX1 = 2.7GHz -15 dBm LOX1, LOX2 Input Return Loss (Note 9) -20 dB Note 1: Limits over temperature are guaranteed by production test at +25°C and via correlation to worst-case temperature testing. Note 2: Minimum and maximum limits are guaranteed by design and characterization, but are not production tested. Note 3: The device has been characterized over the specified frequency range. Operation outside of this range is possible but not guaranteed. _______________________________________________________________________________________ 3 MAX2683/MAX2684 AC ELECTRICAL CHARACTERISTICS—MAX2683 (continued) Note 4: Conversion gain does not include output balun losses, typically 0.3dB at 300MHz on the MAX2683 EV kit and 0.8dB at 900MHz on the MAX2684 EV kit. Note 5: IIP3 measured with two tones at 3605MHz and 3610MHz, -20dBm per tone, fIF = 300MHz. Note 6: IIP2 measured with fRFIN = 3450MHz, PRFIN = -20dBm, fIF = 300MHz. Note 7: Input match optimized for best return loss at fRF = 3600MHz. Note 8: Over specified RF input frequency range with matching network. Note 9: Over specified LO input frequency range. Note 10: IIP3 measured with two tones at 3605MHz and 3610MHz, -20dBm per tone, fIF = 900MHz. Note 11: IIP2 measured with fRFIN = 3150MHz, PRFIN = -20dBm, fIF = 900MHz. Typical Operating Characteristics (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX2683 RBIAS = 820Ω 60 RBIAS = 1.2kΩ 40 RBIAS = 2.0kΩ TA = -40°C 20 TA = +85°C RBIAS = 820Ω 40 RBIAS = 1.2kΩ 30 20 10 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 SUPPLY VOLTAGE (V) CONVERSION GAIN vs. RBIAS 4.5 5.0 6.0 5.0 1400 RBIAS (Ω) 1600 ENX2 = VCC 800 1000 1200 10 9 8 VCC = +3.3V 7 1800 2000 1400 1600 1800 2000 INPUT P1dB vs. RBIAS 3 2 VCC = +5V 1 0 VCC = +3.3V -1 -2 -3 5 1200 VCC = +3.3V 20 5.5 6 1000 VCC = +3.3V 35 RBIAS (Ω) VCC = +5V INPUT IP3 (dBm) VCC = +5V 800 VCC = +5V 40 INPUT IP3 vs. RBIAS 5.5 4 4.0 11 MAX2683 toc04 VCC = +3.3V 6.5 45 SUPPLY VOLTAGE (V) 7.5 7.0 3.5 VCC = +5V 50 25 TA = -40°C 0 2.5 ENX2 = GND 55 30 RBIAS = 2.0kΩ 10 0 TA = +25°C 60 50 60 INPUT P1dB (dBm) 30 70 65 MAX2683/4 toc05 50 80 MAX2683/4 toc03 TA = +25°C 70 90 SUPPLY CURRENT (mA) TA = +85°C SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 80 SUPPLY CURRENT vs. RBIAS 70 MAX2683/4 toc02 90 100 MAX2683/4 toc01 100 SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = VCC) MAX2683 toc06 SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = GND) CONVERSION GAIN (dB) MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler 800 1000 1200 1400 RBIAS (Ω) 1600 1800 2000 800 1000 1200 1400 RBIAS (Ω) _______________________________________________________________________________________ 1600 1800 2000 3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683 CONVERSION GAIN vs. LO POWER (ENX2 = VCC) TA = +25°C 0 -2 TA = +85°C -4 0 -2 TA = +85°C -4 -6 -8 -8 -15 -10 -5 0 20 15 10 5 0 -10 -20 -20 -15 -10 -5 -16 0 -14 -12 -10 -8 -6 -4 -2 0 LO POWER (dBm) LO POWER (dBm) LO POWER (dBm) CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 820Ω) CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 1.2kΩ) CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) TA = +25°C TA = +85°C 4 3 7 6 5 3 2 2 1 1 0 0 3.0 3.5 4.0 4.5 5.0 5.5 MAX2683 toc12 TA = -40°C 6 5 TA = +25°C 4 TA = +85°C 3 ENX2 = VCC ENX2 = GND 1 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 820Ω) INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 1.2kΩ) INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) 9 INPUT IP3 (dBm) 12 TA = +85°C TA = +25°C TA = -40°C 6 10 9 TA = +25°C 8 7 5.5 MAX2683 toc15 10 MAX2683 toc13 15 9 7 2 INPUT IP3 (dBm) 2.5 TA = +25°C TA = +85°C 4 8 MAX2683 toc14 5 9 CONVERSION GAIN (dB) 7 6 8 CONVERSION GAIN (dB) 8 TA = -40°C 9 10 MAX2683 toc11 TA = -40°C 9 10 MAX2683 toc10 10 CONVERSION GAIN (dB) TA = +25°C 2 -6 -10 INPUT IP3 (dBm) 4 25 NOSIE FIGURE (dB) 4 2 6 CONVERSION GAIN (dB) CONVERSION GAIN (dB) 6 TA = -40°C 8 30 MAX2683 toc08 TA = -40°C 8 NOISE FIGURE vs. LO POWER 10 MAX2683 toc07 10 MAX2683 toc09 CONVERSION GAIN vs. LO POWER (ENX2 = GND) 8 TA = +85°C 7 TA = -40°C TA = -40°C TA = +85°C 3 6 6 5 5 TA = +25°C 0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 5 MAX2683/MAX2684 Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX2683 INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 820Ω) INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 1.2kΩ) INPUT P1dB (dBm) INPUT P1dB (dBm) 2 TA = -40°C -2 1 TA = +25°C 0 TA = -40°C MAX2683 toc18 TA = +85°C 2 TA = +25°C 0 -1 INPUT P1dB (dBm) 6 INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) MAX2683 toc17 3 MAX2683 toc16 10 TA = -40°C -2 TA = +25°C -3 TA = +85°C TA = +85°C -6 -1 -10 3.0 3.5 4.0 4.5 5.0 5.5 3.0 3.5 4.0 4.5 5.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 CONVERSION GAIN vs. RF FREQUENCY (RBIAS = 1.2kΩ) CONVERSION GAIN vs. FREQUENCY (ENX2 = GND) CONVERSION GAIN vs. IF FREQUENCY (ENX2 = VCC) 6 5 TA = +85°C TA = +25°C 3 2 7 6 5 TA = +25°C 4 TA = +85°C 3 2 ENX2 = VCC ENX2 = GND 7 6 5 TA = +85°C 4 TA = +25°C 3 IF PORT NARROWBAND MATCH AT 300MHz 0 250 270 RF FREQUENCY (MHz) 290 310 330 350 250 270 IF FREQUENCY (MHz) -40 -60 -80 MAX2683 toc23 0 -10 RETURN LOSS (dB) -20 310 LOX1 PORT RETURN LOSS vs. LO FREQUENCY (ENX2 = VCC) MAX2683 toc22 0 290 IF FREQUENCY (MHz) LOX2 PORT RETURN LOSS vs. LO FREQUENCY (ENX2 = GND) RETURN LOSS (dB) TA = -40°C 8 1 IF PORT NARROWBAND MATCH AT 300MHz 0 3400 3450 3500 3550 3600 3650 3700 3750 3800 9 2 1 0 10 CONVERSION GAIN (dB) 7 8 CONVERSION GAIN (dB) TA = -40°C TA = -40°C 9 MAX2683 toc20 MAX2683 toc19 10 -20 -30 -40 -100 -50 1500 1600 1700 1800 LO FREQUENCY (MHz) MAX2683 toc21 SUPPLY VOLTAGE (V) 8 6 5.5 SUPPLY VOLTAGE (V) 9 1 -5 2.5 SUPPLY VOLTAGE (V) 10 4 -4 -2 2.5 CONVERSION GAIN (dB) MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler 1900 2000 3000 3180 3360 3540 3720 3900 LO FREQUENCY (MHz) _______________________________________________________________________________________ 330 350 3.5GHz Downconverter Mixers with Selectable LO Doubler LOX1 S11 vs. RBIAS (ENX2 = VCC) 820Ω MAX2683 LOX2 S11 vs. RBIAS (ENX2 = GND) 1.2kΩ, 2kΩ, 820Ω 1.2kΩ 2kΩ MAX2683 IF PORT S11 vs. RBIAS 1.2kΩ, 2kΩ, 820kΩ MAX2683 RFIN S11 vs. RBIAS 2kΩ, 1.2kΩ, 820kΩ _______________________________________________________________________________________ 7 MAX2683/MAX2684 Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX2684 RBIAS = 1.2kΩ 40 TA = -40°C 20 60 30 20 10 0 0 3.0 3.5 4.0 RBIAS = 1.2kΩ 40 10 2.5 RBIAS = 820Ω 50 4.5 5.0 3.0 SUPPLY VOLTAGE (V) CONVERSION GAIN vs. RBIAS 4.0 4.5 5.0 VCC = +3.3V 0.6 0.4 20 5.5 11 10 9 8 0 7 800 1800 2000 VCC = +3.3V 1000 1200 1400 1600 1800 CONVERSION GAIN vs. LO POWER (ENX2 = VCC) 1 0 -1 TA = +85°C -2 0 -1 VCC = +3.3V 4 TA = -40°C TA = +25°C 1 0 TA = +85°C -1 -2 16 15 14 13 12 11 -5 -5 LO POWER (dBm) 0 2000 17 -4 -5 1800 18 -4 -10 1600 19 -3 -15 1400 20 -3 -20 1200 NOISE FIGURE vs. LO POWER 3 2 1000 RBIAS (Ω) MAX2683 toc35 MAX2683 toc34 TA = +25°C 2000 1 800 2000 5 CONVERSION GAIN (dB) 2 1800 -4 800 CONVERSION GAIN vs. LO POWER (ENX2 = GND) TA = -40°C 1600 -3 RBIAS (Ω) 4 1400 VCC = +5V -2 RBIAS(Ω) 5 3 1200 2 NOISE FIGURE (dB) 1600 1000 3 6 1400 ENX2 = VCC INPUT P1dB vs. RBIAS VCC = +5V 0.2 1200 VCC = +3.3V RBIAS (Ω) 12 INPUT IP3 (dBm) CONVERSION GAIN (dB) 1.0 1000 VCC = +3.3V 35 INPUT IP3 vs. RBIAS -0.2 8 3.5 13 MAX2683/4 toc31 VCC = +5V 1.2 800 VCC = +5V 40 SUPPLY VOLTAGE (V) 1.4 0.8 45 25 TA = -40°C 2.5 VCC = +5V 50 30 RBIAS = 2.0kΩ 5.5 ENX2 = GND 55 MAX2683/4 toc33 RBIAS = 2.0kΩ TA = +25°C TA = +85°C 60 MAX2683 toc36 30 70 65 SUPPLY CURRENT (mA) 60 50 80 INPUT P1dB (dBm) RBIAS = 820Ω 70 90 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) TA = +25°C MAX2683/4 toc29 TA = +85°C 80 SUPPLY CURRENT vs. RBIAS 70 MAX2683/4 toc32 90 100 MAX2683/4 toc28 100 SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = VCC) MAX2683/4 toc30 SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = GND) CONVERSION GAIN (dB) MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler 10 -20 -15 -10 LO POWER (dBm) -5 0 -16 -14 -12 -10 -8 -6 LO POWER (dBm) _______________________________________________________________________________________ -4 -2 0 3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2684 TA = +85°C -2 -3 1 0 TA = +25°C ENX2 = VCC ENX2 = GND 3.5 4.0 4.5 5.0 3.0 3.5 INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 820Ω) 5.5 2.5 2.5 3.0 3.5 4.0 4.5 5.0 TA = +85°C 9 -6 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 1.2kΩ) INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) 0 MAX2683 toc44 3 2 TA = -40°C TA = +85°C 1 0 -1 TA = +25°C -1 TA = +85°C -2 5.5 -3 -4 TA = +25°C -5 TA = -40°C -6 -7 -3 -10 TA = -40°C 4 0 3.0 -2 TA = +85°C TA = +25°C 5 1 4 INPUT P1dB (dBm) -2 5.5 6 2 5 MAX2683 toc43 TA = -40°C 5.0 7 6 2.5 TA = +25°C 2 4.5 3 TA = +25°C INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 820Ω) 6 4.0 TA = -+85°C 8 7 SUPPLY VOLTAGE (V) 10 3.5 9 TA = -40°C 11 5.5 3.0 10 5 0 TA = +85°C INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) 8 3 -2 INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 1.2kΩ) 12 10 TA = +25°C SUPPLY VOLTAGE (V) 13 INPUT IP3 (dBm) TA = -40°C 6 5.0 14 TA = +25°C 9 4.5 MAX2683 toc41 12 4.0 15 MAX2683 toc40 TA = +85°C 0 -1 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) 15 TA = -40°C 1 -5 2.5 5.5 INPUT IP3 (dBm) 3.0 2 -4 -3 2.5 MAX2683 toc39 3 -3 -2 -5 INPUT IP3 (dBm) TA = +85°C -1 -4 INPUT P1dB (dBm) 4 MAX2683 toc42 TA = +25°C 0 TA = -40°C CONVERSION GAIN (dB) 1 5 INPUT P1dB (dBm) CONVERSION GAIN (dB) 2 -1 2 CONVERSION GAIN (dB) TA = -40°C CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 2kΩ) MAX2683 toc38 4 3 3 MAX2683 toc37 5 CONVERSION GAIN vs SUPPLY VOLTAGE (RBIAS = 1.2kΩ) MAX2683 toc45 CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 820Ω) -8 -4 -9 -5 -10 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 9 MAX2683/MAX2684 Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX2684 CONVERSION GAIN vs. RF FREQUENCY (ENX2 = VCC) TA = -40°C 2 TA = +25°C 1 0 -1 TA = +85°C -2 TA = +25°C 2 1 0 -1 5 4 3 TA = +85°C -2 TA = +25°C TA = -40°C 2 1 0 TA = +85°C -1 -2 -3 -3 -3 -4 -4 -4 -5 -5 -5 3400 3450 3500 3550 3600 3650 3700 3750 3800 3400 3450 3500 3550 3600 3650 3700 3750 3800 RF FREQUENCY (MHz) RF FREQUENCY (MHz) IF FREQUENCY (MHz) CONVERSION GAIN vs. IF FREQUENCY (ENX2 = VCC) LOX2 PORT RETURN LOSS vs. LO FREQUENCY LOX1 PORT RETURN LOSS vs. LO FREQUENCY 1 0 TA = +85°C -1 -20 -30 900 920 940 960 MAX2683 toc51 -10 RETURN LOSS (dB) 2 880 0 -10 RETURN LOSS (dB) TA = +25°C TA = -40°C 3 0 860 MAX2683 toc50 4 MAX2683 toc49 5 MAX2683 toc48 TA = -40°C 3 CONVERSION GAIN (dB) 3 4 CONVERSION GAIN (dB) 4 CONVERSION GAIN (dB) 5 MAX2683 toc46 5 CONVERSION GAIN vs. IF FREQUENCY (ENX2 = GND) MAX2683 toc47 CONVERSION GAIN vs. RF FREQUENCY (ENX2 = GND) CONVERSION GAIN (dB) MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler -20 -30 -2 -40 -40 -3 -4 -50 -50 -5 860 880 900 920 940 960 1200 1300 1350 1400 2400 1450 LOX1 S11 vs. RBIAS (ENX2 = VCC) 1.2kΩ, 2kΩ, 820Ω 2500 2600 2700 LO FREQUENCY (MHz) LO FREQUENCY (MHz) IF FREQUENCY (MHz) 10 1250 LOX2 S11 vs. RBIAS (ENX2 = GND) 1.2kΩ, 2kΩ, 820Ω ______________________________________________________________________________________ 2800 2900 3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2684 IF PORT S11 vs. RBIAS 1.2kΩ, 2kΩ, 820kΩ RFIN S11 vs. RBIAS 2kΩ, 1.2kΩ, 820kΩ Pin Description PIN NAME FUNCTION 1 VCC Supply Voltage Input. Bypass with a 100pF capacitor as close to the pin as possible. 2, 3, 5, 9, 10, 12, 13, 15, EP GND Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle evenly to the board ground plane. 4 RFIN RF Input Port to Mixer. Requires a matching network and a DC-blocking capacitor that may be part of this network. 6 ENX2 LO Frequency-Doubler Enable Input. Drive low to enable the LO doubler and run external LO at half frequency. Drive high to disable the LO doubler and run external LO at full frequency. 7 LOX2 Half-Frequency Local-Oscillator Input to LO Frequency Doubler, LO Filter, and Downconverter Mixer. Requires a DC-blocking capacitor. Leave unconnected if this pin is not used. 8 LOX1 Full-Frequency Local-Oscillator Input to Downconverter Mixer. Requires a DC-blocking capacitor. Leave unconnected if this pin is not used. 11, 14 IFOUT-, IFOUT+ 16 BIAS Differential, Open-Collector IF Output Ports of Mixer. Requires a matching network and pull-up inductors to VCC that can be part of this network. Bias-Setting Resistor Connection. A resistor, RBIAS, placed from BIAS to GND sets the linearity and supply current of the mixer. ______________________________________________________________________________________ 11 MAX2683/MAX2684 Typical Operating Characteristics (continued) (MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.) MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler Table 1. MAX2683/MAX2684 RFIN Port S-Parameters (VCC = +5V, TA = +25°C) RF FREQUENCY (MHz) RBIAS = 820Ω S11 MAG RBIAS = 1.2kΩ S11 PHASE (degrees) S11 MAG RBIAS = 2kΩ S11 PHASE (degrees) S11 MAG S11 PHASE (degrees) MAX2683 3400 0.582 -113.3 0.561 -121.3 0.536 -122.3 3450 0.586 -114.8 0.564 -122.5 0.540 -123.5 3500 0.590 -116.2 0.567 -123.7 0.544 -124.7 3550 0.594 -117.5 0.570 -125.1 0.547 -126.0 3600 0.599 -118.7 0.574 -126.1 0.553 -127.0 3650 0.602 -120.0 0.576 -127.2 0.555 -128.1 3700 0.607 -121.2 0.580 -128.3 0.559 -129.1 3750 0.608 -122.3 0.583 -129.3 0.563 -130.1 3800 0.612 -123.5 0.587 -130.2 0.567 -131.0 MAX2684 3400 0.578 -117.5 0.537 -119.7 0.512 -121.3 3450 0.582 -119.0 0.542 -121.2 0.518 -122.7 3500 0.586 -120.5 0.545 -122.6 0.523 -124.1 3550 0.590 -121.8 0.545 -122.7 0.527 -125.5 3600 0.595 -123.1 0.555 -125.4 0.533 -126.8 3650 0.599 -124.5 0.558 -126.7 0.537 -128.0 3700 0.604 -125.7 0.564 -127.8 0.542 -129.1 3750 0.606 -126.7 0.568 -128.9 0.546 -130.2 3800 0.611 -127.9 0.572 -129.9 0.552 -13.1 Detailed Description The MAX2683/MAX2684 are double-balanced downconverter mixers optimized for the 3.4GHz to 3.8GHz frequency band. The MAX2683 is designed for downconversion to IF frequencies of 100MHz to 400MHz, while the MAX2684 is designed for IF frequencies of 800MHz to 1000MHz. In addition, the devices include a logic-level LO frequency doubler, an integrated LO filter, and externally programmable bias control circuitry. RF Input RFIN is a single-ended input that accepts frequencies in the 3.4GHz to 3.8GHz range. It requires a matching 12 network and a DC-blocking capacitor that may be part of this network. See Typical Operation Circuit for recommended component values. See Table 1 for RFIN port S-parameters. LO Inputs, LO Frequency Doubler, and LO Filter The MAX2683/MAX2684 feature an internal LO frequency doubler that allows the external LO to run at full or half frequency. Running the LO at half frequency has the benefit of reducing unwanted LO leakage through the low-noise amplifier (LNA) to the antenna, reducing injection pulling of the voltage-controlled oscillator ______________________________________________________________________________________ 3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684 Table 2. MAX2683 LO Port S-Parameters (VCC = +5V, TA = +25°C) LOX2 (ENX2 = GND) LOX2 FREQUENCY (MHz) S11 MAG LOX1 (ENX2 = VCC) S11 PHASE (degrees) LOX2 FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) RBIAS = 820Ω 1500 0.234 -82.0 3000 0.362 -163.5 1575 0.237 -86.7 3150 0.358 -165.4 1650 0.241 -91.1 3300 0.338 -167.0 1725 0.247 -95.3 3450 0.306 -167.3 1800 0.254 -98.9 3600 0.271 -164.9 1875 0.262 -102.3 3750 0.235 -160.6 1950 0.268 -104.9 3900 0.200 -154.8 RBIAS = 1.2kΩ 1500 0.211 -77.9 3000 0.343 -159.1 1575 0.213 -83.7 3150 0.341 -160.0 1650 0.217 -89.3 3300 0.330 -162.3 1725 0.222 -94.5 3450 0.310 -162.0 1800 0.230 -99.3 3600 0.285 -160.2 1875 0.240 -103.6 3750 0.256 -156.4 1950 0.249 -107.1 3900 0.224 -151.1 RBIAS = 2.0kΩ 1500 0.213 -78.0 3000 0.339 -155.2 1575 0.214 -83.7 3150 0.340 -156.0 1650 0.218 -89.3 3300 0.332 -156.0 1725 0.223 -94.5 3450 0.315 -155.3 1800 0.231 -99.3 3600 0.294 -153.3 1875 0.241 -103.7 3750 0.268 -150.0 1950 0.249 -107.2 3900 0.240 -145.5 (VCO) from the PA, and reducing the demands of designing a high-frequency VCO. An internal LO bandpass filter is integrated after the frequency doubler to help reduce LO harmonic content and spurious mixing. To enable the LO frequency doubler, drive ENX2 to a logic-low level and connect the half-frequency external LO to the LOX2 port. To disable and bypass the LO frequency doubler and LO filter, drive ENX2 to a logichigh level and connect the full-frequency external LO to ______________________________________________________________________________________ 13 MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler Table 3. MAX2684 LO Port S-Parameters (VCC = +5V, TA = +25°C) LOX2 (ENX2 = GND) LOX2 FREQUENCY (MHz) S11 MAG LOX1 (ENX2 = VCC) S11 PHASE (degrees) LOX1 FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) RBIAS = 820Ω 1200 0.225 -59.6 2400 0.249 -138.9 1250 0.219 -62.8 2500 0.266 -143.5 1300 0.215 -66.0 2600 0.281 -147.5 1350 0.212 -69.1 2700 0.296 -152.1 1400 0.210 -72.4 2800 0.305 -158.8 1450 0.209 -75.4 2900 0.302 -167.3 RBIAS = 1.2kΩ 1200 0.228 -64.7 2400 0.235 -135.3 1250 0.222 -68.9 2500 0.251 -139.8 1300 0.219 -71.2 2600 0.265 -143.5 1350 0.216 -74.4 2700 0.280 -147.8 1400 0.214 -77.8 2800 0.290 -152.8 1450 0.213 -81.0 2900 0.292 -157.0 RBIAS = 2.0kΩ 1200 0.212 -75.4 2400 0.224 -132.3 1250 0.222 -63.1 2500 0.240 -136.6 1300 0.217 -66.2 2600 0.255 -140.1 1350 0.213 -69.2 2700 0.269 -143.8 1400 0.211 -72.3 2800 0.279 -147.6 1450 0.209 -75.3 2900 0.283 -150.3 the LOX1 port. Disabling the LO doubler has the benefit of reducing the supply current by 15mA. See Tables 2 and 3 for the LO input frequency ranges. LOX1 and LOX2 are single-ended LO inputs that achieve a return loss of typically -20dB over the specified LO input frequency range. They are internally biased and require a DC-blocking capacitor. To improve LOX2 input return loss, use a series inductor between the blocking capacitor and LOX2 input. See 14 the Typical Operating Circuit for recommended component values. See Tables 2 and 3 for LOX1 and LOX2 S-parameters. Leave the unused port unconnected. IF Output The MAX2683 is optimized for IF frequencies in the 100MHz to 400MHz range, while the MAX2684 is optimized for IF frequencies in the 900MHz to 1000MHz range. The differential, open-collector IFOUT- and IFOUT+ ports require external pull-up inductors to VCC, ______________________________________________________________________________________ 3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684 Table 4. MAX2683 IFOUT Port S-Parameters (VCC = +5V, TA = +25°C) RBIAS = 820Ω RBIAS = 1.2kΩ RBIAS = 1.2kΩ RF FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) S11 MAG S11 PHASE (degrees) S11 MAG S11 PHASE (degrees) 150 0.915 -11.3 0.914 -11.2 0.930 -10.9 200 0.907 -14.8 0.905 -14.7 0.920 -14.2 250 0.904 -17.7 0.905 -17.8 0.917 -17.2 300 0.899 -21.3 0.900 -21.3 0.911 -20.3 350 0.894 -24.5 0.893 -24.5 0.907 -23.5 Table 5. MAX2684 IFOUT Port S-Parameters (VCC = +5V, TA = +25°C) RBIAS = 820Ω RBIAS = 1.2kΩ RBIAS = 1.2kΩ RF FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) S11 MAG S11 PHASE (degrees) S11 MAG S11 PHASE (degrees) 860 0.955 -49.4 0.955 -49.6 0.955 -49.7 880 0.952 -50.3 0.952 -50.5 0.950 -50.6 900 0.950 -51.1 0.948 -51.4 0.946 -51.4 920 0.946 -52.0 0.944 -52.3 0.941 -52.3 940 0.943 -53.0 0.940 -53.1 0.937 -53.3 960 0.941 -53.6 0.936 -54.0 0.935 -53.8 as well as an output matching network for optimum performance. See Typical Operating Circuit for recommended component values. See Tables 4 and 5 for IFOUT port S-parameters. Bias Circuitry The linearity and supply current of the MAX2683/ MAX2684 are externally programmable with a single resistor, RBIAS, from BIAS to GND. A nominal resistor value of 1.2kΩ will set an IIP3 of +9dBm and a supply current of 55mA. Decreasing the resistor value improves linearity at the cost of increased supply current. Increasing the resistor value decreases supply current while degrading linearity. Use resistor values in the range of 820kΩ to 2kΩ. ___________Applications Information Layout Considerations A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, radiation, and inductance. Use separate, low-inductance vias to the ground plane for each ground pin. For best performance, solder the exposed pad on the bottom of the device package evenly to the board ground plane. Power-Supply and ENX2 Bypassing Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass V CC with a 10µF capacitor in parallel with a 100pF capacitor located as close to the VCC pin as possible. Bypass ENX2 with a 100pF capacitor to ground to minimize noise injected into the LO doubler cell. Use a series resistor (typically 1.2kΩ) to further reduce coupling of high-frequency signals into the ENX2 pin. ______________________________________________________________________________________ 15 MAX2683/MAX2684 3.5GHz Downconverter Mixers with Selectable LO Doubler Typical Operating Circuit VCC 1 100pF 10µF 2 3 3300pF 1.2nH RF INPUT 4 5 1pF BIAS VCC 16 GND RBIAS 1.5k GND RFIN GND 8.2pF MAX2683 IFOUT+ GND 15 GND 14 300MHz IF OUTPUT 13 39nH 1.2k LO DOUBLER OFF ENABLE ON 6 GND ENX2 12 VCC 3.3pF 1.5kΩ 0.01µF 100pF 100pF HALF-FREQUENCY LO INPUT 3.9nH 39nH 7 IFOUTLOX2 GND 100pF FULL-FREQUENCY LO INPUT 8 LOX1 GND BALUN 11 8.2pF 10 9 NOTE: EVENLY SOLDER EXPOSED PAD (EP) ON BOTTOM OF DEVICE TO GROUND PLANE. 8.2pF IFOUT+ GND 14 900MHz IF OUTPUT 13 6.8nH GND 12 VCC 300Ω 0.01µF 6.8nH IFOUT- BALUN 11 8.2pF MAX2684 IF OUTPUT DIFFERENTIAL TO SINGLE-ENDED CONVERSION NETWORK. 16 ______________________________________________________________________________________ 3.5GHz Downconverter Mixers with Selectable LO Doubler TSSOP.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX2683/MAX2684 Package Information