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| 19-1667; Rev 0; 4/00 1.8GHz to 2.5GHz Direct Downconversion Receivers General Description The MAX2700/MAX2701 are highly integrated direct downconversion (zero-IF) receivers designed for wideband wireless local loop (WLL) systems operating in the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s' zero-IF architecture eliminates the need for IF downconversion stages and the use of an IF SAW filter. This reduces the overall receiver cost by reducing the component count and required board space. The MAX2700/MAX2701 have three main blocks: lownoise amplifier (LNA), quadrature downconverter, and baseband variable gain amplifiers (VGAs). The LNA is a single-ended amplifier with selectable gain and shutdown options. It provides a high input third-order intercept point (IP3), which reduces cross-modulation and gain compression due to high-level RF interference. The quadrature downconverter section consists of two highly linear double-balanced mixers driven by an external local oscillator (LO) with a selectable LO doubler. The double-balanced mixers are optimized to provide high input IP3 and minimum added noise. The mixers' high input second-order intercept point (IIP2) helps minimize receiver desensitization due to highlevel AM-modulated interferers. The two baseband VGAs in each channel provide 80dB of total maximum gain and greater than 60dB of gain control. The first AGC amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression performance. An external lowpass filter between baseband VGAs provides the required channel selectivity at the adjacent channel. An integrated gain offset correction loop circuit provides <0.3dB amplitude mismatch between the I and Q channels. The MAX2700/MAX2701 operate from a single +2.7V to +3.3V power supply, drawing only 165mA of supply current and 20A in shutdown mode. Both devices are available in small 48-pin TQFP packages with exposed paddle (EP) for optimum high-frequency performance. o Input Frequency Range 1.8GHz to 2.1GHz (MAX2700) 2.1GHz to 2.5GHz (MAX2701) o Cascaded Performance at 1960 MHz 3.5dB Noise Figure -7.5dBm Input IP3 at Maximum Gain o LNA with Selectable Gain and Shutdown Option o High Linearity Direct I/Q Downconverter o Wideband LO Quadrature Generator o 3dB Baseband Channel Bandwidth of At Least 56MHz o Variable Gain Baseband Amplifiers with >60dB Control Range o Baseband Gain Offset Correction Loop o +2.7V to +3.3V Single-Supply Operation o Small 48-pin TQFP-EP Package Features MAX2700/MAX2701 Ordering Information PART MAX2700ECM MAX2701ECM TEMP. RANGE -40C to 85C -40C to 85C PIN-PACKAGE 48 TQFP-EP 48 TQFP-EP Pin Configuration TOP VIEW IIN1DCI1+ DCI1IOUT1 VCC 40 39 38 MIX_I GND IIN1+ 48 47 46 45 44 43 42 41 37 IIN2+ VCC LO GND CEXTCEXT+ VCC X2_EN GND LNAIN GND GND GAIN_SET SHDN AGC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 36 35 34 33 32 31 30 29 28 27 26 25 ________________________Applications Wireless Local Loop Wideband Direct-Sequence Spread-Spectrum Systems Two-Way MMDS Wideband 2.4GHz ISM Radios Digital Microwave Radios MAX2700 MAX2701 IIN2DCI2+ DCI2IOUT2 GND RFINRFIN+ VCC QOUT2 DCQ2DCQ2+ QIN2- QIN1+ QIN1- GND LNAOUT DCQ1+ DCQ1QOUT1 TQFP-EP ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MIXTNK QIN2+ GND MIX_Q VCC 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V RF Signals PRFIN, PLNAIN, PLO .....................................................+15dBm Baseband Signals IIN1+ to IIN1-, IIN2+ to IIN2-, QIN1+ to QIN1-, QIN2+ to QIN2- ......................................2V Input Voltages AGC, GAIN_SET, SHDN, X2_EN, CEXT_, RFIN_, LO, LNAIN, IIN_ _, QIN_ _ , DCI_ _ , DCQ_ _ to GND ..........-0.3V to (VCC + 0.3V) Input Current AGC..............................................................50mA All Digital Inputs...............................................10mA Continuous Power Dissipation (TA = +70C) 48-Pin TQFP-EP (derate 27mW/C above +70C) .....2000mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C 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. DC ELECTRICAL CHARACTERISTICS (MAX2700/MAX2701 EV kit (Figure 3), VCC = +2.7V to +3.3V, SHDN = GAIN_SET = VCC, X2_EN = GND, VAGC = 1.25V, CEXT+ connected to CEXT-; no RF input signals applied; RFIN, LNAIN, LO inputs are terminated with 50, LNAOUT connected to VCC through a 10nH inductor; MIX_I, MIX_Q, QIN1+, QIN1-, QOUT1, IIN1+, IIN1-, IOUT1, QIN2+, QIN2-, QOUT2, IIN2+, IIN2-, IOUT2 pins are unconnected; TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C.) PARAMETERS SUPPLY Supply Voltage LNA enabled TA = +25C Operating Supply Current LNA enabled TA = -40C to +85C LNA disabled LNA disabled MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 20 2 0.6 SHDN, X2_EN, GAIN_SET Input Bias Current AGC, +0.5 < VAGC < +2.0V AGC, VAGC = 0.5V, SHDN = GND MIX_I, MIX_Q DC Output Voltage IOUT1, QOUT1 IOUT2, QOUT2 -1 -22 -2 1.2 1.1 1.25 V 0.5 12 2 A 2.7 165 167 155 156 3.3 215 220 200 205 230 235 210 215 100 A V V mA V CONDITIONS MIN TYP MAX UNITS Shutdown Supply Current CONTROL INPUTS/OUTPUTS Input Logic Voltage High Input Logic Voltage Low SHDN = GND, VAGC = 0.5V 2 _______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers AC ELECTRICAL CHARACTERISTICS (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) PARAMETERS LNA STAGE Operating Frequency Range (Note 1) MAX2700 MAX2701 MAX2700, fLNAIN = 1960MHz TA = -40C to 85C Power Gain (Note 2) MAX2701, fLNAIN = 2400MHz TA = -40C to 85C MAX2700, fLNAIN = 1960MHz MAX2701, fLNAIN = 2400MHz Input Third-Order Intercept (Note 3) Reverse Isolation Isolation MAX2700, fLNAIN = 1960MHz MAX2701, fLNAIN = 2400MHz GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND 1800 2100 13.5 -7.5 13 -8 13 -6 12.5 -6.5 2.0 15.8 2.3 16.7 +2.7 +5.1 +3.8 +4.3 28 30 44 1.1 1.8 1.3 2.1 1.7 1.6 1.2 1.4 1800 2100 16 14.5 19.3 18.1 11.0 12.8 2100 2500 21.5 20 - dB dB dBm dB 16.5 -1.8 17.1 -1.9 2100 2500 19.5 2 20 2.5 18.5 0.5 19 1.0 dB MHz CONDITIONS MIN TYP MAX UNITS MAX2700/MAX2701 Noise Figure 1800MHz to 2500MHz, GAIN_SET = VCC or GND LNAIN to LO, fLNAIN = 1800MHz to 2500MHz LNAOUT to RFIN, fLNAIN = 1800 MHz to 2500 MHz MAX2700 GAIN_SET = VCC At LNA input, with external matching circuit at LNAIN GAIN_SET = GND MAX2701 GAIN_SET = VCC GAIN_SET = GND MAX2700 GAIN_SET = VCC At LNA output, with external matching circuit at LNAOUT GAIN_SET = GND MAX2701 GAIN_SET = VCC GAIN_SET = GND VSWR MIXER STAGE (Differential RF input to mixer I/Q outputs with external balun and matching circuit to 50) Frequency Range (Notes 1, 2) Voltage Gain DSB Noise Figure MAX2700 MAX2701 MAX2700, fRFIN = 1960 MHz MAX2701, fRFIN = 2400 MHz MAX2700, fRFIN = 1960MHz MAX2701, fRFIN = 2400MHz MHz dB dB _______________________________________________________________________________________ 3 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 AC ELECTRICAL CHARACTERISTICS (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) PARAMETERS Input Third-Order Intercept (Note 4) Input Second-Order Intercept (Note 5) VSWR CONDITIONS MAX2700, f LO = 980MHz MAX2701, f LO = 1200MHz MAX2700 MAX2701 With 50 external matching at RFIN+/ RFINMAX2700 Isolation (RFIN to MIX_I/Q) MAX2701 MAX2700 MAX2701 fRFIN = 1800MHz to 2100MHz fRFIN 20MHz fRFIN = 2100MHz to 2500MHz fRFIN 20MHz Isolation (RFIN to LO) MAX2700, f RFIN = 1800MHz to 2100MHz MAX2701, f RFIN = 2100MHz to 2500MHz fLO = 900MHz to 1050MHz, X2_EN = GND MAX2700 fLO = 900MHz to 1050MHz, X2_EN = GND, isolation at 2 x FLO fLO = 1800MHz to 2100MHz, X2_EN = V CC fLO = 1050MHz to 1250MHz, X2_EN = GND MAX2701 fLO = 1050MHz to 1250MHz, X2_EN = GND, isolation at 2 x F LO fLO = 2100MHz to 2500MHz, X2_EN = V CC Mixer Spurious Suppression Baseband Bandwidth 2 x LO - RF (Note 6) MIX_I/Q -1dB bandwidth (Note 2) -3dB bandwidth Baseband frequency = 125kHz Up to -1dB baseband width (Note 2) 37 MIN TYP +6.3 +6.5 +28.3 +38 1.5 1.2 35 28 22 12 38 45 49 dB dB MAX UNITS dBm dBm - 43 dB 33 60 Isolation (LO to RFIN) 44 70 60 69 170 0.1 0 0.7 dB 0.7 dBc MHz Gain Mismatch GV (I-Q) (between mixer I and Q channels) 4 _______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers AC ELECTRICAL CHARACTERISTICS (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) PARAMETERS Group Delay Differential Group Delay (Note 2) Output Impedance Mixer Output Level (Note 2) CONDITIONS tgd , RFIN to MIX_I/Q, frequency up to -1dB baseband width tgd (between mixer I and Q channels) Zout , MIX_I, MIX_Q, frequency up to -1dB baseband width MIX_I, MIX_Q, baseband output at -1dB compression point 1.4 1.4 2.1 MIN TYP 1.8 1 MAX UNITS ns ns Vp-p MAX2700/MAX2701 LO DOUBLER, LO BUFFER, QUADRATURE GENERATOR X2_EN = GND LO Frequency Range (Notes 1, 2) LO Input Power (Note 7) X2_EN = V CC X2_EN = V CC or GND fLO = 900MHz to 1050MHz, X2_EN = GND MAX2700 LO VSWR MAX2701 fLO = 2100MHz to 2500MHz, X2_EN = V CC Quadrature Error , MIX_I to MIX_Q -1dB bandwidth (Note 2) -3dB bandwidth IIN1+, IIN1-, QIN1+, QIN1-, single-ended Between IIN1+ and QIN1+ VAGC = 0.5V VAGC = 2.0V Mismatch between IIN1 to IOUT1 and QIN1 to QOUT1, 0.5V < V AGC < 2 V Guaranteed Monotonic over 0.5V _______________________________________________________________________________________ 5 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 AC ELECTRICAL CHARACTERISTICS (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) PARAMETERS Group Delay Group Delay Mismatch (Note 2) Output Impedance Output Impedance Mismatch Output Voltage (Note 2) CONDITIONS IIN1+ to IOUT1, up to -1dB frequency QIN1+ to QOUT1, up to -1dB frequency Between I and Q channel from 100kHz up to -1dB IOUT1, QOUT1, up to -1dB bandwidth Between IOUT1 and QOUT1, up to -1dB bandwidth At -1dB compression point, IOUT1, QOUT1 -1dB bandwidth (Note 2) -3dB bandwidth IIN2+, IIN2-, QIN2+, QIN2-, single-ended Between IIN2+ and QIN2+ VAGC = 0.5V VAGC = 2.0V Mismatch between IIN2 to IOUT2 and QIN2 to QOUT2, 0.5V < VAGC < 2V Gain Correction Disabled Gain Correction Enabled (2dB initial mismatch) -0.6 37 0.7 19 MIN TYP 1.6 1.6 0.3 7 1 1.1 34 63 2.1 1.5 4.4 39 0.9 dB 0.3 30 14 47 0.2 1.7 0.2 4.0 4.0 1.2 1.9 2.0 1.4 dB/V dB degrees ns ns Vp-p 9.5 42 1.3 MAX UNITS ns ns Vp-p BASEBAND STAGE 2 (IIN2+ TO IOUT2, QIN2+ TO QOUT2) Channel Bandwidth Input Impedance Input Impedance Mismatch Voltage Gain (G V) MHz K dB Voltage Gain Mismatch (Note 2) VGA2 Gain Slope Noise Figure Phase shift (Note 2) Group Delay Group Delay Mismatch (Note 2) Output Impedance Output Impedance Mismatch Output Voltage (Note 2) Guaranteed monotonic over 0.5V < V AGC <2V, VAGC =1.25V ZS = 1.1k For 10dB of gain IIN2+ to IOUT2, QIN2+ to QOUT2, up to -1dB Frequency Between I and Q channel from 100kHz up to -1dB frequency IOUT2 , QOUT2, up to -1dB bandwidth Between IOUT2 and QOUT2, up to -1 dB bandwidth At -1dB compression point, IOUT2 , QOUT2 VAGC = 2.0V VAGC = 0.5V 6 _______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers AC ELECTRICAL CHARACTERISTICS (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) PARAMETERS POWER SUPPLY Power-Supply Ripple Rejection VCC = 3.0V + 100mVPP frequency = 100 to 300kHz, VOUT = 0.3Vp-p, (Note 9) Mixer VGA1 VGA2 57 35 28 dBc CONDITIONS MIN TYP MAX UNITS MAX2700/MAX2701 Note 1: This is the recommended operating frequency range. The parts have been characterized over the specified frequency range. Operation outside this range is possible but not guaranteed. Note 2: Guaranteed by design and characterization. Note 3: LNA is matched at input and output to 50; f1 = 1960MHz, f2 = 1965MHz for MAX2700; f1 = 2400MHz, f2 = 2405MHz for MAX2701; PIN = -30dBm per tone. Note 4: Mixer IIP3 test. For MAX2700, RFIN is matched to 50 at 1960MHz. At RFIN, apply f1 = 1964.2MHz, f2 = 1968.2MHz, PIN = -25dBm per tone, and measure IM3 product power level at 200kHz. For MAX2701, RFIN is matched to 50 at 2400MHz. At RFIN, apply f1 = 2404.2MHz, f2 = 2408.2MHz, PIN = -25dBm per tone, and measure IM3 product power level at 200kHz. Note 5: Mixer IIP2 test. For MAX2700, RFIN is matched to 50 at 1960MHz. At RFIN, apply f1 = 1964.2MHz, f2 = 1968.2MHz, PIN = -25dBm per tone, and measure IM2 product power level at 4MHz. For MAX2701, RFIN is matched to 50 at 2400MHz. At RFIN, apply f1 = 2404.2MHz, f2 = 2408.2MHz, PIN = -25dBm per tone, and measure IM2 product power level at 4MHz. Note 6: Mixer spurious attenuation response. Mixer is matched to 50 at 1800MHz and FLO = 900MHz (LO doubler enabled). FRFIN = 1801MHz, PRFIN = -85dBm, FSPUR = 3601.5MHz, PSPUR = -60dBm. Measure IF at 1MHz and spurious at 1.5MHz at the output. For better than 38dBc spurious attenuation response, output spurious level should be at least 10dB lower than the IF signal level. In the (2 x LO) - (1 x RF) spurious product notation, LO denotes the frequency of the final LO driving the I/Q mixers inputs. Note 7: Mixer gain specifications are production tested over LO power range. Note 8: A filter output impedance of 1.1k can directly drive the VGA inputs since there is minimal mismatch loss between source and VGA input impedance. Note 9: Electrolytic bypass cap to VCC not connected. _______________________________________________________________________________________ 7 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700 ICC vs. VCC vs. TEMPERATURE MAX2700-01 LNA GAIN vs. FREQUENCY vs. TEMPERATURE MAX2700-02 LNA GAIN vs. FREQUENCY vs. TEMPERATURE 4 2 0 TA = -45C TA = +25C GAIN (dB) MAX2700-03 180 20 TA = -45C 18 TA = +25C 170 ICC (mA) TA = +25C TA = +85C GAIN (dB) 16 TA = +85C 14 160 TA = -45C 150 -2 -4 -6 TA = +85C 12 -8 HIGH-GAIN MODE 1700 1800 1900 2000 2100 -10 LOW-GAIN MODE 1700 1800 1900 2000 2100 FREQUENCY (MHz) 140 2.5 2.7 2.9 VCC (V) 3.1 3.3 3.5 10 FREQUENCY (MHz) LNA REVERSE ISOLATION vs. FREQUENCY vs. GAIN MODE MAX2700-04 LNA NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE 2.6 2.4 2.2 2.0 1.8 1.6 TA = -45C HIGH-GAIN MODE 1700 1750 1800 1850 1900 FREQUENCY (MHz) 1950 2000 TA = +25C TA = +85C MAX2700-05 -25 S12 (dB) -30 LOW-GAIN MODE -35 NF (dB) 1900 2000 2100 HIGH-GAIN MODE -40 1700 1800 FREQUENCY (MHz) 1.4 8 _______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700/MAX2701 MAX2700 LNA NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE MAX2700-06 LNA IIP3 vs. TEMPERATURE MAX2700-07 LNA IIP3 vs. VCC 4.0 3.5 3.0 IIP3 (dBm) HIGH-GAIN MODE LOW-GAIN MODE MAX2700-08 18 6 5 4 LOW-GAIN MODE 4.5 17 TA = +85C IIP3 (dBm) NF (dB) 16 TA = +25C 15 TA = -45C 14 LOW-GAIN MODE 1700 1800 1900 2000 FREQUENCY (MHz) 3 2 1 HIGH-GAIN MODE 2.5 2.0 1.5 1.0 0.5 13 0 -45 -25 -5 15 35 55 75 TEMPERATURE (C) 0 2.50 2.75 3.00 VCC (V) 3.25 3.50 MIXER VOLTAGE GAIN vs. FREQUENCY vs. TEMPERATURE MAX2700-09 MIXER VOLTAGE GAIN vs. FREQUENCY vs. TEMPERATURE MAX2700-10 MIXER VOLTAGE GAIN vs. FREQUENCY vs. LO POWER 24 22 VOLTAGE GAIN (dB) 20 18 16 14 12 LO = -16dBm TO -10dBm MAX2700-11 24 22 VOLTAGE GAIN (dB) TA = -45C 24 22 VOLTAGE GAIN (dB) 20 18 16 14 12 TA = +25C TA = -45C TA = +25C 20 18 16 14 12 10 DOUBLER ENABLED 1.7 1.8 1.9 FREQUENCY (GHz) 2.0 2.1 TA = +85C TA = +85C 10 DOUBLER DISABLED 1.7 1.8 1.9 FREQUENCY (GHz) 2.0 2.1 10 DOUBLER DISABLED 1.7 1.8 1.9 FREQUENCY (GHz) 2.0 2.1 _______________________________________________________________________________________ 9 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700 DSB MIXER NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE MAX2700-12 MIXER IIP3 vs. VCC vs. TEMPERATURE 7 6 IIP3 (dBm) TA = +25C TA = +85C IIP2 (dBm) 5 4 3 TA = -45C 25 20 MAX2700-13 MIXER IIP2 vs. VCC vs. TEMPERATURE MAX2700-14 15 14 13 12 NF (dB) 11 10 9 8 7 1800 1850 1900 1950 2000 2050 TA = +25C TA = -45C TA = +85C 8 35 30 TA = +85C 15 10 TA = +25C TA = -45C 2 1 0 2100 2.60 2.85 DOUBLER ENABLED 3.10 VCC (V) 3.35 5 DOUBLER ENABLED 2.60 2.85 3.10 VCC (V) 3.35 FREQUENCY (MHz) ERROR vs. LO FREQUENCY MAX2700-15 LO-RFIN ISOLATION vs. LO FREQUENCY (INCLUDING BALUN) MAX2700-16 LO-LNAIN ISOLATION vs. LO FREQUENCY DOUBLER DISABLED LO-LNAIN ISOLATION (dB) -50 MAX2700-17 2.00 -40 -40 DOUBLER DISABLED ERROR (DEGREES) 1.75 LO-RFIN ISOLATION (dB) -45 1.50 DOUBLER ENABLED DOUBLER DISABLED -50 DOUBLER ENABLED -55 -60 DOUBLER ENABLED -70 1.25 1.00 1.7 1.8 1.9 FREQUENCY (GHz) 2.0 2.1 -60 0.85 0.90 0.95 FREQUENCY (GHz) 1.00 1.05 -80 0.85 0.90 0.95 FREQUENCY (GHz) 1.00 1.05 10 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700/MAX2701 MAX2700 MIXER BASEBAND BANDWIDTH vs. RL MAX2700-18 MIXER'S OUTPUT 1dB COMPRESSION POINT vs. VCC vs. RL 2.4 MIXER OUTPUT (Vp-p) 2.2 2.0 1.8 1.6 1.4 1.2 1.0 RL = 0.56k RL = 1.05k, 2.00k MAX2700-19 160 140 120 BANDWIDTH (MHz) 100 80 60 40 20 0 0.50 0.75 1.00 1.25 RL (k) 1.50 1.75 1dB BANDWIDTH 3dB BANDWIDTH 2.6 2.00 2.5 2.7 2.9 3.1 3.3 3.5 VCC (V) MAX2701 ICC vs. VCC vs. TEMPERATURE MAX2701-20 LNA GAIN vs. FREQUENCY vs. TEMPERATURE MAX2701-21 LNA GAIN vs. FREQUENCY vs. TEMPERATURE 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 TA = +85C TA = +25C TA = -45C MAX2701-22 190 20 19 18 TA = -45C 5 180 ICC (mA) TA = +85C GAIN (dB) 17 16 15 14 13 12 TA = +25C 170 TA = +25C 160 TA = -45C 150 2.5 2.7 2.9 VCC (V) 3.1 3.3 3.5 TA = +85C 11 10 HIGH-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500 -5 LOW-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500 ______________________________________________________________________________________ 11 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2701 LNA REVERSE ISOLATION vs. FREQUENCY MAX2701-23 LNA NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE MAX2701-24 LNA NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE MAX2701-25 -24 HIGH-GAIN MODE -26 3.5 TA = +85C 3.0 TA = +25C TA = -45C NF (dB) 2.5 20 18 S12 (dB) -30 2.0 NF (dB) -28 LOW-GAIN MODE 16 14 TA = +85C TA = +25C TA = -45C -32 12 HIGH-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500 LOW-GAIN MODE 2100 2200 2300 2400 2500 FREQUENCY (MHz) -34 2100 2200 2300 2400 2500 FREQUENCY (MHz) 1.5 10 LNA IIP3 vs. TEMPERATURE MAX2701-26 LNA IIP3 vs. VCC MAX2701-27 MIXER VOLTAGE GAIN vs. FREQUENCY vs. TEMPERATURE MAX2701-28 6 5 4 IIP3 (dBm) LOW-GAIN MODE 6 5 4 IIP3 (dBm) 3 2 1 0 -1 HIGH-GAIN MODE LOW-GAIN MODE 22 21 TA = -45C VOLTAGE GAIN (dB) 20 19 18 17 16 15 TA = +25C DOUBLER ENABLED 2.1 2.2 TA = +85C 3 HIGH-GAIN MODE 2 1 0 -45 -25 -5 15 35 55 75 TEMPERATURE (C) 2.50 2.75 3.00 VCC (V) 3.25 3.50 2.3 2.4 FREQUENCY (GHz) 2.5 12 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2701 MIXER VOLTAGE GAIN vs. FREQUENCY vs. TEMPERATURE MAX2701-29 MIXER VOLTAGE GAIN vs. FREQUENCY vs. LO POWER 24 22 VOLTAGE GAIN (dB) 20 18 16 14 NF (dB) PLO = -16dBm TO -10dBm MAX2701-30 DSB MIXER NOISE FIGURE vs. FREQUENCY vs. TEMPERATURE 14 13 12 11 10 9 8 TA = -45C TA = +25C MAX2701-31 22 21 TA = -45C VOLTAGE GAIN (dB) 20 19 18 17 16 15 TA = +25C DOUBLER DISABLED 2.1 2.2 TA = +85C 15 TA = +85C 12 10 2.5 DOUBLER ENABLED 2.1 2.2 2.3 FREQUENCY (GHz) 2.4 2.5 7 2100 2200 2300 FREQUENCY (MHz) 2400 2500 2.3 2.4 FREQUENCY (GHz) MIXER IIP3 vs. VCC vs. TEMPERATURE MAX2701-32 MIXER IIP2 vs. VCC vs. TEMPERATURE MAX2701-33 ERROR vs. LO FREQUENCY MAX2701-34 11 9 7 60 TA = +25C 50 40 IIP2 (dBm) 2.0 1.5 ERROR (DEGREES) IIP3 (dBm) DOUBLER ENABLED 1.0 5 TA = +25C 3 1 -1 2.60 2.85 TA = +85C TA = -45C 30 20 10 TA = -45C TA = +85C 0.5 DOUBLER DISABLED DOUBLER ENABLED 3.10 VCC (V) 3.35 0 DOUBLER ENABLED 2.60 2.85 3.10 VCC (V) 3.35 0 2.1 2.2 2.3 FREQUENCY (GHz) 2.4 2.5 ______________________________________________________________________________________ 13 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2701 LO-RF ISOLATION vs. LO FREQUENCY (INCLUDING BALUN) MAX2701-35 LO-LNAIN ISOLATION vs. LO FREQUENCY MAX2701-36 -40 DOUBLER DISABLED LO-RFIN ISOLATION (dB) -50 -40 LO-LNAIN ISOLATION (dB) -50 DOUBLER DISABLED -60 -60 -70 DOUBLER ENABLED -80 1.05 1.10 1.15 FREQUENCY (GHz) 1.20 1.25 -70 DOUBLER ENABLED -80 1.150 1.175 1.200 FREQUENCY (GHz) 1.225 1.250 MIXER BASEBAND BANDWIDTH vs. RL MAX2701-37 MIXER OUTPUT 1dB COMPRESSION POINT vs. VCC vs. RL 2.8 2.6 MIXER OUTPUT (Vp-p) 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 RL = 1.05k RL = 0.56k RL = 2.00k MAX2701-38 180 160 140 BANDWIDTH (MHz) 120 100 80 60 40 20 0 0.50 0.75 1.00 1.25 RL (k) 1.50 1.75 1dB BANDWIDTH 3dB BANDWIDTH 3.0 2.00 2.5 2.7 2.9 3.1 3.3 3.5 VCC (V) 14 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700/MAX2701 MAX2700/MAX2701 AGC VOLTAGE GAIN vs. AGC VOLTAGE vs. TEMPERATURE 40 TA = -45C MAX2700/1-39 I/Q VOLTAGE GAIN MISMATCH vs. TEMPERATURE 1.5 I/Q VOLTAGE GAIN (dB) 1.0 0.5 NF (dB) 0 -0.5 -1.0 -1.5 TA = +85C TA = -45C TA = +25C 25 20 15 10 5 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 0.50 MAX2700/1-40 VGA1 NOISE FIGURE vs. AGC VOLTAGE vs. TEMPERATURE MAX2700/1-41 2.0 35 30 TA = -45C TA = +85C VOLTAGE GAIN (dB) 30 TA = +85C 20 TA = +25C TA = +25C 10 0 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 -2.0 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 VGA1 VGA OUTPUT 1dB COMPRESSION POINT vs. AGC VOLTAGE vs. RL MAX2700/1-42 VGA1 BANDWIDTH vs. RL MAX2700/1-43 VGA2 VOLTAGE GAIN vs. AGC VOLTAGE vs. TEMPERATURE MAX2700/1-44 2.00 70 50 V01 (PEAK TO PEAK) RL = 2.0k 1.50 RL = 0.6k 1.25 RL = 1.6k 1.00 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 RL = 1.1k 50 VOLTAGE GAIN (dB) 1.75 VGA1 BANDWIDTH (MHz) 60 3dB BANDWIDTH 40 TA = -45C 30 TA = +85C 40 20 TA = +25C 10 30 1dB BANDWIDTH 20 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 RL (k) 0 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 ______________________________________________________________________________________ 15 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Typical Operating Characteristics (continued) (MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.) MAX2700/MAX2701 VGA2 I/Q VOLTAGE GAIN MISMATCH vs. TEMPERATURE MAX2700/1-45 VGA2 I/Q VOLTAGE GAIN MISMATCH WITH GAIN CORRECTION MAX2700/1-46 VGA2 VGA OUTPUT 1dB COMPRESSION POINT vs. AGC VOLTAGE vs. RL RL = 1.025k 2.2 V01 (PEAK-TO-PEAK V) MAX2700/1-47 3 TA = -45C 2 TA = +25C 2.0 2dB INPUT MISMATCH GAIN CORRECTION ENABLED 2.3 1.6 I/Q MISMATCH (dB) I/Q VOLTAGE GAIN (dB) 1.2 2.1 RL = 0.56k RL = 0.25k 2.0 1 0.8 0 TA = +85C 0dB INPUT MISMATCH GAIN CORRECTION DISABLED 0.4 1.9 RL = 0.1k -1 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 0 0.50 0.75 1.00 1.25 AGC (V) 1.50 1.75 2.00 1.8 0.75 1.00 1.25 1.50 1.75 2.00 AGC (V) VGA2 BANDWIDTH vs. RS MAX2700/1-48 VGA2 Q TO I CROSSTALK vs. RL MAX2700/1-49 COMBINED VGA1 AND VGA2 TURN-ON TIME vs. DC OFFSET CAPACITANCE* MAX2700/1-50 100 -30 -35 Q TO I CROSSTALK (dB) -40 -45 -50 -55 -60 500 VGA2 BANDWIDTH (MHz) 400 TURN-ON TIME (s) 80 3dB BANDWIDTH 60 300 200 40 1dB BANDWIDTH 20 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 RS (k) 100 0 100 300 500 700 900 1100 0 25 50 75 100 RL () DC OFFSET CAPACITANCE (nF) *C19, C23, C30, C36 in the EV kit schematic in Figure 3 represent DC offset capacitors. Time from SHDN = GND to SHDN = VCC, until DC quiescent point settles within 10% of static DC quiescent point. 16 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Pin Description PIN 1 NAME CEXTFUNCTION Inverting Input Port of VGA2 I/Q Gain Imbalance Correction Circuitry. Connect an external capacitor between CEXT- and CEXT+ to activate the circuit. Short CEXT- to CEXT+ to disable. Noninverting Input Port of VGA2 I/Q Gain Imbalance Correction Circuitry. Connect an external capacitor between CEXT+ and CEXT- to activate the circuit. Short CEXT- to CEXT+ to disable. Supply Voltage. Bypass VCC to GND with capacitors as close to pin as possible. Logic-Level Enable for Doubler Circuitry. Drive logic low to turn on the doubler (fLO = fRFIN/2). Drive logic high to bypass the doubler (fLO = fRFIN). Ground. Connect to ground plane with minimal inductance. LNA Input. Connect to GND to turn the LNA off. Off-chip 50 match required. LNA Gain Select Input. Drive logic high to select the high-gain mode. Drive logic low to select low-gain mode. Shutdown Control Input. Drive logic low to enable shutdown mode. Automatic Gain-Control Input for AGC. Bypass this pin with a 1000pF capacitor to GND to minimize coupling. LNA Output. This pin requires an external pullup inductor and off-chip 50 match. Mixer Q-Channel Baseband Output. Connect external series capacitor to AC-couple the output to the load. Noninverting VGA1, Q-Channel Baseband Input Inverting VGA1, Q-Channel Baseband Input Noninverting Offset Correction Input for Q-Channel VGA1 Amplifier Inverting Offset Correction Input for Q-Channel VGA1 Amplifier Q-Channel VGA1 Amplifier Baseband Output Inductive Common-Mode Degeneration Pin for Mixer Stages Noninverting VGA2, Q-Channel Baseband Input Inverting VGA2, Q-Channel Baseband Input Noninverting Offset Correction Input for Q-Channel VGA2 Amplifier Inverting Offset Correction Input for Q-Channel VGA2 Amplifier Q-Channel VGA2 Amplifier Baseband Output I/Q Mixers Inverting Input. For narrow frequency bands between 1.8GHz and 2.5GHz, port must be matched using external matching components. MAX2700/MAX2701 2 3, 12, 17, 29, 38, 48 4 5, 7, 8, 13, 15, 32, 44, 46 6 9 10 11 14 16 18 19 20 21 22 23 24 25 26 27 28 30 CEXT+ VCC X2_EN GND LNAIN GAIN_SET SHDN AGC LNAOUT MIX_Q QIN1+ QIN1DCQ1+ DCQ1QOUT1 MIXTNK QIN2+ QIN2DCQ2+ DCQ2QOUT2 RFIN+ ______________________________________________________________________________________ 17 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Pin Description (continued) PIN 31 33 34 35 36 37 39 40 41 42 43 45 47 NAME RFINIOUT2 DCI2DCI2+ IIN2IIN2+ IOUT1 DCI1DCI1+ IIN1IIN1+ MIX_I LO FUNCTION I/Q Mixers Noninverting Input. For narrow frequency bands between 1.8GHz and 2.5GHz, port must be matched using external matching components. I-Channel VGA2 Baseband Output Inverting Offset Correction Input for I-Channel VGA2 Amplifier Noninverting Offset Correction Input for I-Channel VGA2 Amplifier Inverting VGA2, I-Channel Baseband Input Noninverting VGA2, I-Channel Baseband Input I-Channel VGA1 Amplifier Baseband Output Inverting Offset Correction Input for I-Channel VGA1 Amplifier Noninverting Offset Correction Input for I-Channel VGA1 Amplifier Inverting VGA1, I-Channel Baseband Input Noninverting VGA1, I-Channel Baseband Input Mixer I-Channel Baseband Output. Connect external series capacitor to AC-couple the output to the load. LO Input. Internally matched to 50. Detailed Description The MAX2700/MAX2701 consist of five major blocks: LNA, I/Q direct demodulator, VGAs, gain correction, and bias circuits. Low-Noise Amplifier The LNA is a two-gain-level amplifier with low noise figure and high IIP3. Connect GAIN_SET to GND to switch the amplifier to a low-gain mode that provides an accurate gain step. High IIP3 minimizes the cross-modulation between TX power leakage and close-in interferers at the RX input. The LNA can be turned off independent of the other functional blocks by connecting LNAIN to GND. External matching is required to match the input and output to 50. The LNA in Figures 1 and 2 is matched to 1960MHz and 2400MHz over a narrow bandwidth. I/Q Demodulator The direct I/Q demodulator downconverts the RF signal directly to baseband I and Q signals. This architecture's main advantage is that the received signal is amplified and filtered at baseband rather than at some high intermediate frequency. This eliminates the need for an expensive IF SAW filter and the IF oscillator. 18 Furthermore, the direct conversion scheme eliminates the need for image rejection, thereby relaxing the bandpass filter selectivity requirements following the LNA. The direct downconverter consists of highly linear double-balanced I/Q mixers, an LO frequency doubler option, an LO quadrature generator, and baseband I/Q buffer amplifiers driven by the mixers' outputs. In a direct downconversion receiver, I/Q mixers have more stringent requirements on mixer output linearity since they need to handle large voltage swings at baseband due to close-in interferers. The RF signal is applied to the differential input (RFIN+, RFIN-) of the direct downconversion receiver through an off-chip balun. The differential input structure results in a higher common-mode rejection for second-order nonlinearity generated in the receiver's front end. The differential input requires matching to appropriate impedance of the balun. Some applications may require a bandpass filter between the LNA and the mixer, as shown in Figures 1 and 2, to attenuate the residual transmit power leakage and out-of-band spurious signals. The mixer baseband buffers amplify the mixer I and Q differential outputs and convert them to single-ended outputs (MIX_I, MIX_Q). These buffer amplifiers have ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Functional Diagram IOUT2 AGC2 I_CHANNEL IIN2IIN2+ OFFSET CORRECTION LOOP IOUT1 AGC1 I_CHANNEL IIN1IIN1+ OFFSET CORRECTION LOOP MIX_I OFFSET CORRECTION LOOP AMP VGA CONTROL OFFSET CORRECTION LOOP QOUT1 AGC1 Q_CHANNEL AGC2 Q_CHANNEL QIN2QIN2+ QOUT2 MAX2700/MAX2701 QIN1QIN1+ I_CHANNEL DOUBLE BALANCED MIXER RFINRFIN+ Q_CHANNEL MIX_Q Q_CHANNEL I_CHANNEL AMP X2_EN MULTIPLEXER DOUBLER X2 LD GENERATOR LO POLYPHASE RC QUADRATURE GENERATOR BIAS BLOCK MST SHDN BIAS BIAS HIGH-GAIN AMP LNA BLOCK LNAOUT LOW-GAIN AMP SHDN LNAIN GAIN_SET very low output impedance (<2). The smallest load that should be used is 600. At the output of the I/Q mixers' buffers, baseband lowpass filters should be used to provide adjacent and alternate channel selectivity. This reduces the level of adjacent channel and close-in interferers to the input of the following baseband amplifier. The LO signal is applied externally to the LO input port. An LO doubler circuit doubles the LO signal frequency before it is applied to the mixer LO port. Connect X2_EN to ground to enable the LO doubler circuit. With this circuit enabled, the required LO frequency is half that of the RF carrier frequency. Connect X2_EN to VCC to disable the frequency doubler circuit and the LO frequency is the same as the RF carrier frequency. The half LO frequency scheme results in the use of lower frequency and lower cost VCOs. It also reduces the LO leakage to the receiver's input. The mixer is guaranteed 19 ______________________________________________________________________________________ MAX2700/MAX2701 VCC VCC GND MIX_I GND LO IIN1+ IIN1- DCI1+ DCI1- 48 47 36 46 45 44 43 42 41 40 IOUT1 39 38 IIN2+ 37 GND VCC GND MIX_Q QIN1+ QIN1- LNAOUT DCQ1+ DCQ1QOUT1 5pF MIXTNK 5.6nH QIN2+ Figure 1. MAX2700 Typical Operating Circuit (1960MHz) LPF_1 2.2k LPF_2 1k 680 1k 2.2k 0.056F 0.1F 0.1F 680 0.1F 0.1F 0.1F 68pF 0.056F LO INPUT 0.1F CEXT1 2 1.8GHz to 2.5GHz Direct Downconversion Receivers 20 IIN2DCI2+ DCI2IOUT2 GND RFINRFIN+ VCC QOUT2 28 27 26 25 13 17 14 15 16 18 19 20 21 22 23 24 CEXT CEXT+ X2 O O/I 35 68pF 3 VCC 1 MAX2700 50 0.56F 22pF 4.7nH 33 34 0.1F DOUBLER ENABLE/DISABLE 4 5 32 31 30 29 6 7 8 9 10 11 12 X2_EN GND LNAIN 6pF GND GND I/Q DETECT I-CHANNEL LOAD 1pF 4.7nH RF INPUT 4.7nH DUPLEXER 100pF GAIN_SET SHDN CTRL 1 CTRL 2 AGC 100pF VCC AGC 0.01F 68pF VCC 0.056F 1k LPF_Q1 22pF BPF 2.2k 68pF 1.5nH LNA GAIN SELECT 22pF 50 Q2 Q-CHANNEL LOAD 68pF T-LINE BALUN FROM TRANSMITTER RX ENABLE 1000pF DCQ2- 0.56F 0.1F DCQ2+ QIN20.1F 680 VCC 10F 0.1F 0.1F 680 TO ALL VCC PINS 0.056F 1k 0.1F 2.2k 1000pF 68pF ______________________________________________________________________________________ LPF_Q2 100pF 0.01F LPF_1 2.2k LPF_2 1k 1k 2.2k 0.056F 0.1F 0.1F 680 68pF VCC VCC 38 36 35 34 37 LO INPUT 0.056F 0.1F GND IIN1+ IIN1DCI1+ DCI1IOUT1 IIN2+ GND MIX _I 680 0.1F 0.1F LO 48 47 46 45 44 43 42 41 40 39 0.1F CEXT1 2 3 IIN2DCI2+ DCI20.56F IOUT2 GND 50 2.7nH 22pF 0.5pF 2.7nH 22pF VCC QOUT2 50 Q2 I2 0.1F CEXT CEXT+ VCC X2_EN 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 28 29 30 31 33 68pF DOUBLER ENABLE/DISABLE GND 32 X2 O1 I/O GND VCC GND MIX_Q QIN1+ QIN1- DCQ1+ DCQ1QOUT1 LNAOUT MIXTNK QIN2+ 3pF 5.6nH Figure 2. MAX2701 Typical Operating Circuit (2400MHz) MAX2701 I/Q DETECT RFINRFIN+ I-CHANNEL LOAD LNAIN 0.5pF GND GND 1000pF GAIN_SET SHDN CTRL1 CTRL 2 AGC 100pF VCC 1000pF AGC 0.01F 68pF 22pF 0.056F 0.1F 0.1F 1k BPF 2pF 2.7nH VCC 68pF LPF_Q1 2.2k VCC 100pF 0.01F 680 0.056F 2.2k 1k 1nH RF INPUT T-LINE BALUN 68pF 27 26 25 10pF DUPLEXER LNA GAIN SELECT FROM TRANSMITTER RX ENABLE DCQ2- 0.56F 0.1F DCQ2+ QIN20.1F 680 Q-CHANNEL LOAD VCC 10F 0.1F TO ALL VCC PINS 1000pF 68pF 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 ______________________________________________________________________________________ LPF_Q2 21 MAX2700/MAX2701 J18 VCC J19 + J20 C42 OPEN VCC C48 OPEN R38 1k C33 C34 100pF 0.1F C39 0.56F C38 0.1F 43 42 41 40 39 38 37 IIN2+ C32 0.1F 45 44 C36 C37 0.1F 0.1F C41 OPEN LO 47 46 C40 22pF R35 820 R32 0 R30 1.1k R31 3.6k L7 0 C35 0.56F R39 1k R37 3.6k R36 1.1k VCC R33 1.1k R43 51 C46 68pF C4 10F C45 1000pF R44 51 R34 1k J14 C47 OPEN J17 J16 J15 VCC 48 GND GND IIN1+ IIN1- VCC MIX_I DCI1+ DCI1- IOUT1 9 GAIN_SET C6 1000pF 10 SHDN C7 1000pF 11 AGC C8 100pF 12 VCC C10 68pF GND GND 13 14 LNAOUT 15 16 MIX_Q 17 V CC 18 QIN1+ 19 QIN120 DCQ1+ 21 DCQ1GND 22 QOUT1 23 MIXTNK C17 0.1F C14 C16 100pF 0.1F C18 0.1F C19 0.1F C20 0.56F C49 5pF (3pF) R18 820 R17 3.6k R19 1k 2 24 QIN2+ VCC R45 0 L3 C11 68pF C13 (2pF) OPEN C12 22pF 1 1.8GHz to 2.5GHz Direct Downconversion Receivers 22 R40 0 C43 68pF J1 IIN235 34 33 C29 32 0.56F 31 30 RFIN+ VCC QOUT2 DCQ2DCQ2+ QIN2C27 22pF C26 29 22pF C25 68pF 28 27 26 25 C22 0.1F C21 0.1F L4 5.6nH R21 3.6k R13 1k VCC R15 0 R14 1k J6 J7 J8 J9 J10 R16 1.1k R20 1k R22 1.1k R41 51 C24 0.56F C23 0.1F R23 820 R27 51 C30 0.1F C31 0.1F 36 1 CEXTC1 0.01F 2 CEXT+ DCI2+ DCI2IOUT2 GND U1 LNAIN GND GND MAX2700 MAX2701 RFINR1 0 3 C2 68pF 4 C3 1000pF 5 GND 6 7 8 C5 0 (10pF) Z4 6pF (1nH) X2_EN VCC R2 100 R29 820 VCC J13 R28 51 5 1 C28 1pF 2 (5pF) BALUN/TOKO/B4F R26 0 VCC R24 51 J11 R25 51 4 3 Figure 3. MAX2700/MAX2701 EV kit Schematic L6 4.7nH (2.7nH) L5 4.7nH (2.7nH) Z1 4.7nH (0.5pF) R5 100 R6 100 R11 100 R12 0 C9 0.01F J12 C15 0.56F R42 51 X2EN VCC R3 0 R4 J2 0 J4 VCC R7 0 R8 J4 0 VCC R9 0 R10 J5 0 ______________________________________________________________________________________ VCC () ARE FOR MAX2701EV KIT ONLY. 1.8GHz to 2.5GHz Direct Downconversion Receivers to operate without degrading its performance over the LO power range of -10dBm to -16dBm. The quadrature generator consists of a wideband polyphase network. Each output of the polyphase filter is buffered, amplified, and then fed to the mixer's differential LO port. VGA2 I/Q Gain Mismatch Correction The signal amplitudes at the outputs of the I- and Qchannel VGA2 amplifiers are compared, and any difference is corrected by a differential feedback network associated with the gain control circuitry. Differential amplitude information is extracted by use of a single external capacitor across pins 1 and 2 (CEXT- and CEXT+). The residual difference signal is amplified and fed back to the gain control network, increasing the gain of the channel with the smaller signal while decreasing the gain of the larger signal's channel. This network will correct amplitude mismatches generated by gain mismatches in the previous stages of the receiver (the mixer and VGA1), as well as insertion-loss mismatch. The correction network is capable of decreasing up to 2dB of amplitude mismatch at the inputs of the I/Q VGA2 amplifiers to <0.5dB amplitude mismatch. The gain correction network can be disabled by shorting CEXT- to CEXT+. MAX2700/MAX2701 Variable Gain Amplifier (VGA) The AGC in each baseband channel I/Q is implemented by two variable gain amplifiers with equal gains. Each amplifier provides about 40dB voltage gain at the maximum setting and 30dB of gain control. The first baseband VGA (VGA1) is a cascaded wideband amplifier with differential input and single-ended output. It is optimized for low noise in the high-gain state and has low-power dissipation and sufficient linearity in all gain settings to ensure desired compression performance. The second baseband VGA (VGA2) is a multistage wideband amplifier with differential inputs and a singleended output. In each channel, connect a baseband lowpass filter between VGA1 and VGA2 to provide additional channel selectivity at the adjacent channel. If the VGA amplifiers are driven single ended, the complementary input of VGA should be AC-coupled to ground through a matched source impedance. VGA Offset Correction An internal offset correction feedback amplifier associated with each VGA removes the DC offsets present in the VGAs. Offset correction preserves maximum output compression performance during maximum gain conditions. Each offset correction loop effectively AC-couples the associated VGA signal path. Each VGA1 network yields a highpass corner frequency according to the following: f-3dB (Hz) = 5300 / CDC (nF) (VAGC = 2.0V) f-3dB (Hz) = 700 / CDC (nF) (VAGC = 0.5V) where C DC is the value of the capacitors, in nanofarads, across DCI1+, DCI1- and DCQ1+, DCQ1-. Note that the corner frequency is a function of the gain setting, increasing with increasing gain. Each VGA2 network provides a highpass corner frequency predicted by the following: f-3dB (Hz) = 145 / CDC (F) where CDC is the value of the capacitors, in microfarads, across DCI2+, DCI2- and DCQ2+, DCQ2-. The time constants associated with the offset correction networks limit turn-on time. For applications where the turn-on time is critical, the offset correction networks can be disabled by shorting the corresponding pins together (DCI1+ to DCI1-, DCQ1+ to DCQ1-, DCI2+ to DCI2-, and DCQ2+ to DCQ2-). Bias Circuit Operate the MAX2700/MAX2701 in shutdown mode by connecting SHDN to GND, reducing current consumption to 20A. In shutdown mode, bias current to all the blocks is turned off through a master shutdown circuit. In applications where the LNA is not used, turn off the LNA by connecting the LNAIN to ground. Applications Information LNA Matching The MAX2700/MAX2701 are designed to operate from 1.8GHz to 2.1GHz and 2.1GHz to 2.5GHz, respectively. The LNAs in Figures 1 and 2 are optimized for noise figure and gain centered around 1960MHz and 2400MHz, respectively. Operation at other frequencies in the band requires reoptimization of the input and output matching circuits. The noise figure is sensitive to input matching and losses in the input traces. LNA input matching should be optimized for desired noise figure, gain, and VSWR performance. High Q matching elements should be used at the LNA input. Proper board layout is essential to increase the isolation between LO and the LNA input. This minimizes LO leakage and thus DC offset. I/Q Demodulator Input Matching The RF input match of the I/Q demodulator in Figure 1 and 2 are optimized for 1960MHz and 2400MHz operation, respectively. For operation at a different frequency, the matching circuit should be reoptimized. Single-ended operation at the demodulator is achieved through the use of an off-chip balun transformer. In Figure 1, the balun, inductors, and capacitors consti23 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 tute the matching circuit of the differential I/Q demodulator input. Layout Issues A properly designed PC board is an essential part of any RF/microwave circuit. Use controlled impedance lines on all frequency inputs and outputs. Use lowinductance connections to ground on all ground pins and wherever the components are connected to ground. Place decoupling capacitors close to all VCC connections. For proper chip operation, the metal pad- I/Q Mixer and VGA1 Output Load Requirements To retain acceptable linearity performance, the mixer and VGA1 output loads should be >600. Table 1. MAX2700 LNA S-Parameters High-Gain Mode (VCC = 3.0V) FREQUENCY (GHz) 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 |S11| 0.542 0.485 0.471 0.466 0.443 0.441 0.436 0.324 0.288 0.300 0.320 S11 -84.1 -82.9 -80.1 -78.8 -79.2 -79.3 -84.8 -88.3 -74.9 -66.7 -63.1 |S21| 7.09 7.412 7.268 7.07 6.977 6.635 6.115 6.119 5.947 5.687 5.31 S21 53.97 41.4 29.5 19.9 10.1 0.2 -7.96 -13.47 -22.7 -31.1 -40.5 |S12| 0.023 0.025 0.024 0.0243 0.025 0.025 0.024 0.0338 0.0383 0.0387 0.0384 S12 65.36 46.6 34.3 29.6 22.5 13.8 16.4 15.23 -4.813 -20.7 -32.8 |S22| 0.367 0.286 0.216 0.185 0.217 0.306 0.387 0.408 0.476 0.529 0.587 S22 37.3 11.4 -23.1 -68.4 -99.5 -127 -152.8 -165 -176.7 172 162.4 Table 2. MAX2700 LNA S-Parameters Low-Gain Mode (VCC = 3.0V) FREQUENCY (GHz) 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 |S11| 0.637 0.625 0.622 0.618 0.617 0.617 0.616 0.611 0.611 0.61 0.6 S11 -65.6 -66.3 -67.1 -67.3 -67 -69.2 -70.1 -71.8 -74.5 -76.8 -80 |S21| 0.731 0.763 0.772 0.76 0.758 0.717 0.678 0.603 0.634 0.634 0.621 S21 52.5 42.9 31.3 21.2 10.3 -1.1 -10.7 -13 -19.5 0.27 -37 |S12| 0.018 0.018 0.016 0.014 0.014 0.015 0.014 0.022 0.028 0.03 0.033 S12 77 52 40 39 38 34 24 37.6 13.4 -5 -14 |S22| 0.398 0.328 0.258 0.191 0.203 0.238 0.332 0.323 0.36 0.402 0.484 S22 41.5 21.8 -7 -45 -79 -114 -141 -105 -170 -178 174 24 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Table 3. MAX2701 LNA S-Parameters High-Gain Mode (VCC = 3.0V) FREQUENCY (GHz) 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 |S11| 0.303 0.283 0.269 0.260 0.254 0.250 0.241 0.230 0.218 S11 -110 -108 -108 -109 -111 -114.6 -120 -129 -139 |S21| 6.71 6.35 5.98 5.7 5.37 5.08 4.82 4.55 4.37 S21 -32.9 -42.7 -49.8 -56.6 -63.4 -69.7 -75.7 -81.5 -87 |S12| 0.036 0.04 0.042 0.042 0.043 0.043 0.04 0.037 0.035 S12 -28.1 -42.6 -55 -67.4 -80 -92 -104 -114 -122 |S22| 0.563 0.61 0.63 0.64 0.64 0.632 0.626 0.625 0.635 S22 -162.5 -178 168.4 155.4 144 134.4 127 121 116 Table 4. MAX2701 LNA S-Parameters Low-Gain Mode (VCC = 3.0V) FREQUENCY (GHz) 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 |S11| 0.589 0.59 0.591 0.596 0.594 0.58 0.548 0.506 0.469 S11 -102.2 -106.12 -111.15 -117.3 -125.2 -134 -144 -154.4 -164 |S21| 0.684 0.662 0.644 0.63 0.621 0.608 0.589 0.556 0.519 S21 -36.2 -45.2 -52.8 -60.4 -69 -77.8 -87.8 -98 -107 |S12| 0.025 0.029 0.032 0.033 0.036 0.037 0.038 0.035 0.029 S12 -10.36 -21.6 -35.3 -50.4 -62.2 -76.5 -96 -109 -120 |S22| 0.46 0.49 0.51 0.54 0.56 0.58 0.6 0.62 0.63 S22 -157 -172 176.7 165 154.5 145.2 136.5 129 122 Table 5. MAX2700 Mixer RFIN+ Input S-Parameters (VCC = 3.0V) FREQUENCY (GHz) 1.70 1.75 1.80 1.85 1.90 1.95 2.00 |S11| 0.612 0.637 0.624 0.615 0.607 0.603 0.598 S11 -101.2 -105 -111.5 -116 -121 -128 -135 Table 6. MAX2701 Mixer RFIN+ Input S-Parameters (VCC = 3.0V) FREQUENCY (GHz) 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 |S11| 0.590 0.600 0.604 0.619 0.634 0.651 0.663 0.675 0.690 S11 -152 -161 -171 180 171 162.7 154 147 142 ______________________________________________________________________________________ 25 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Table 7. MAX2700 LO Input S-Parameters (X2_EN = 1, X2_EN = 0) DOUBLER DISABLED X2_EN = VCC FREQUENCY (GHz) 1.70 1.75 1.80 1.85 1.90 1.95 2.00 -- -- |S11| 0.03 0.053 0.086 0.108 0.135 0.161 0.186 -- -- DOUBLER ENABLED X2_EN = 0 |S11| S11 0.479 0.474 0.466 0.456 0.442 0.424 0.403 0.384 0.365 -50.6 -50.1 -51.6 -52 -52 -53 -53.6 -54 -54 Table 8. MAX2701 LO Input S-Parameters (X2_EN = 1, X2_EN = 0) DOUBLER DISABLED X2_EN = VCC FREQUENCY (GHz) 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 |S11| 0.257 0.279 0.299 0.314 0.33 0.347 0.357 0.366 0.373 DOUBLER ENABLED X2_EN = 0 |S11| S11 0.358 0.341 0.32 0.299 0.268 -- -- -- -- -53.4 -53 -52 -52 -51 -- -- -- -- S11 FREQUENCY (GHz) 92 116 123 127 128 132 136 -- -- 850 875 900 925 950 975 1000 1025 1050 S11 FREQUENCY (GHz) 160 164 167 171 174 178 -179 -175 -171 1.05 1.10 1.15 1.20 1.25 -- -- -- -- Chip Information TRANSISTOR COUNT: 3307 26 ______________________________________________________________________________________ 1.8GHz to 2.5GHz Direct Downconversion Receivers Package Information 48L,TQFP.EPS MAX2700/MAX2701 ______________________________________________________________________________________ 27 1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 Package Information (continued) 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. 28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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