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1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701 hig


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19-1667; 4/00
1.8GHz 2.5GHz Direct Downconversion Receivers
MAX2700/MAX2701 highly integrated direct downconversion (zero-IF) receivers designed wideband wireless local loop (WLL) systems operating 1.8GHz 2.5GHz band. MAX2700/MAX2701s' zero-IF architecture eliminates need downconversion stages filter. This reduces overall receiver cost reducing component count required board space. MAX2700/MAX2701 have three main blocks: lownoise amplifier (LNA), quadrature downconverter, baseband variable gain amplifiers (VGAs). single-ended amplifier with selectable gain shutdown options. provides high input third-order intercept point (IP3), which reduces cross-modulation gain compression high-level interference. quadrature downconverter section consists highly linear double-balanced mixers driven external local oscillator (LO) with selectable doubler. double-balanced mixers optimized provide high input minimum added noise. mixers' high input second-order intercept point (IIP2) helps minimize receiver desensitization highlevel AM-modulated interferers. baseband VGAs each channel provide 80dB total maximum gain greater than 60dB gain control. first amplifier optimized noise, power dissipation, high linearity over entire gain range ensure high gain compression performance. external lowpass filter between baseband VGAs provides required channel selectivity adjacent channel. integrated gain offset correction loop circuit provides <0.3dB amplitude mismatch between channels. MAX2700/MAX2701 operate from single +2.7V +3.3V power supply, drawing only 165mA supply current 20µA shutdown mode. Both devices available small 48-pin TQFP packages with exposed paddle (EP) optimum high-frequency performance. Input Frequency Range 1.8GHz 2.1GHz (MAX2700) 2.1GHz 2.5GHz (MAX2701) Cascaded Performance 1960 3.5dB Noise Figure -7.5dBm Input Maximum Gain with Selectable Gain Shutdown Option High Linearity Direct Downconverter Wideband Quadrature Generator Baseband Channel Bandwidth Least 56MHz Variable Gain Baseband Amplifiers with >60dB Control Range Baseband Gain Offset Correction Loop +2.7V +3.3V Single-Supply Operation Small 48-pin TQFP-EP Package
Features
MAX2700/MAX2701
Ordering Information
PART MAX2700ECM MAX2701ECM TEMP. RANGE -40°C 85°C -40°C 85°C PIN-PACKAGE TQFP-EP TQFP-EP
Configuration
VIEW IIN1DCI1+ DCI1IOUT1
MIX_I IIN1+
IIN2+
CEXTCEXT+ X2_EN LNAIN GAIN_SET SHDN
_Applications
Wireless Local Loop Wideband Direct-Sequence Spread-Spectrum Systems Two-Way MMDS Wideband 2.4GHz Radios Digital Microwave Radios
MAX2700 MAX2701
IIN2DCI2+ DCI2IOUT2 RFINRFIN+ QOUT2 DCQ2DCQ2+ QIN2-
QIN1+ QIN1-
LNAOUT
DCQ1+ DCQ1QOUT1
TQFP-EP Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
MIXTNK QIN2+
MIX_Q
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
ABSOLUTE MAXIMUM RATINGS
.-0.3V Signals PRFIN, PLNAIN, .+15dBm Baseband Signals IIN1+ IIN1-, IIN2+ IIN2-, QIN1+ QIN1-, QIN2+ QIN2- .±2V Input Voltages AGC, GAIN_SET, SHDN, X2_EN, CEXT_, RFIN_, LNAIN, IIN_ QIN_ DCI_ DCQ_ .-0.3V (VCC 0.3V) Input Current AGC.±50mA Digital Inputs.±10mA Continuous Power Dissipation +70°C) 48-Pin TQFP-EP (derate 27mW/°C above +70°C) .2000mW Operating Temperature Range .-40°C +85°C Storage Temperature Range .-65°C +150°C Junction Temperature .+150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(MAX2700/MAX2701 (Figure +2.7V +3.3V, SHDN GAIN_SET VCC, X2_EN GND, VAGC 1.25V, CEXT+ connected CEXT-; input signals applied; RFIN, LNAIN, inputs terminated with LNAOUT connected through 10nH inductor; MIX_I, MIX_Q, QIN1+, QIN1-, QOUT1, IIN1+, IIN1-, IOUT1, QIN2+, QIN2-, QOUT2, IIN2+, IIN2-, IOUT2 pins unconnected; -40°C +85°C, unless otherwise noted. Typical values +3.0V, +25°C.)
PARAMETERS SUPPLY Supply Voltage enabled +25°C Operating Supply Current enabled -40°C +85°C disabled disabled MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 SHDN, X2_EN, GAIN_SET Input Bias Current AGC, +0.5 VAGC +2.0V AGC, VAGC 0.5V, SHDN MIX_I, MIX_Q Output Voltage IOUT1, QOUT1 IOUT2, QOUT2 1.25 CONDITIONS UNITS
Shutdown Supply Current CONTROL INPUTS/OUTPUTS Input Logic Voltage High Input Logic Voltage
SHDN GND, VAGC 0.5V
1.8GHz 2.5GHz Direct Downconversion Receivers
ELECTRICAL CHARACTERISTICS
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
PARAMETERS STAGE Operating Frequency Range (Note MAX2700 MAX2701 MAX2700, fLNAIN 1960MHz -40°C 85°C Power Gain (Note MAX2701, fLNAIN 2400MHz -40°C 85°C MAX2700, fLNAIN 1960MHz MAX2701, fLNAIN 2400MHz Input Third-Order Intercept (Note Reverse Isolation Isolation MAX2700, fLNAIN 1960MHz MAX2701, fLNAIN 2400MHz GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET GAIN_SET 1800 2100 13.5 -7.5 12.5 -6.5 15.8 16.7 +2.7 +5.1 +3.8 +4.3 1800 2100 14.5 19.3 18.1 11.0 12.8 2100 2500 21.5 16.5 -1.8 17.1 -1.9 2100 2500 19.5 18.5 CONDITIONS UNITS
MAX2700/MAX2701
Noise Figure
1800MHz 2500MHz, GAIN_SET LNAIN fLNAIN 1800MHz 2500MHz LNAOUT RFIN, fLNAIN 1800 2500 MAX2700 GAIN_SET input, with external matching circuit LNAIN GAIN_SET MAX2701 GAIN_SET GAIN_SET MAX2700 GAIN_SET output, with external matching circuit LNAOUT GAIN_SET MAX2701 GAIN_SET GAIN_SET
VSWR
MIXER STAGE (Differential input mixer outputs with external balun matching circuit Frequency Range (Notes Voltage Gain Noise Figure MAX2700 MAX2701 MAX2700, fRFIN 1960 MAX2701, fRFIN 2400 MAX2700, fRFIN 1960MHz MAX2701, fRFIN 2400MHz
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
ELECTRICAL CHARACTERISTICS (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
PARAMETERS Input Third-Order Intercept (Note Input Second-Order Intercept (Note VSWR CONDITIONS MAX2700, 980MHz MAX2701, 1200MHz MAX2700 MAX2701 With external matching RFIN+/ RFINMAX2700 Isolation (RFIN MIX_I/Q) MAX2701 MAX2700 MAX2701 fRFIN 1800MHz 2100MHz fRFIN 20MHz fRFIN 2100MHz 2500MHz fRFIN 20MHz Isolation (RFIN MAX2700, RFIN 1800MHz 2100MHz MAX2701, RFIN 2100MHz 2500MHz 900MHz 1050MHz, X2_EN MAX2700 900MHz 1050MHz, X2_EN GND, isolation 1800MHz 2100MHz, X2_EN 1050MHz 1250MHz, X2_EN MAX2701 1050MHz 1250MHz, X2_EN GND, isolation 2100MHz 2500MHz, X2_EN Mixer Spurious Suppression Baseband Bandwidth (Note MIX_I/Q -1dB bandwidth (Note -3dB bandwidth Baseband frequency 125kHz -1dB baseband width (Note +6.3 +6.5 +28.3 UNITS
Isolation RFIN)
Gain Mismatch
(I-Q) (between mixer channels)
1.8GHz 2.5GHz Direct Downconversion Receivers
ELECTRICAL CHARACTERISTICS (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
PARAMETERS Group Delay Differential Group Delay (Note Output Impedance Mixer Output Level (Note CONDITIONS RFIN MIX_I/Q, frequency -1dB baseband width (between mixer channels) Zout MIX_I, MIX_Q, frequency -1dB baseband width MIX_I, MIX_Q, baseband output -1dB compression point UNITS Vp-p
MAX2700/MAX2701
DOUBLER, BUFFER, QUADRATURE GENERATOR X2_EN Frequency Range (Notes Input Power (Note X2_EN X2_EN 900MHz 1050MHz, X2_EN MAX2700 VSWR MAX2701 2100MHz 2500MHz, X2_EN Quadrature Error MIX_I MIX_Q -1dB bandwidth (Note -3dB bandwidth IIN1+, IIN1-, QIN1+, QIN1-, single-ended Between IIN1+ QIN1+ VAGC 0.5V VAGC 2.0V Mismatch between IIN1 IOUT1 QIN1 QOUT1, 0.5V Guaranteed Monotonic over 0.5V VAGC 1.25V 1.1k (Note 10dB gain (with AGC) VAGC 2.0V VAGC 0.5V -1.5 BASEBAND STAGE (IIN1 IOUT1, QIN1 QOUT1) Channel Bandwidth Input Impedance Input Impedance Mismatch Voltage Gain Voltage Gain Mismatch VGA1 Gain Slope Noise Figure Phase Shift (Note dB/V degrees degrees 1800MHz 2100MHz, X2_EN 1050MHz 1250MHz, X2_EN MAX2700 MAX2701 MAX2700 MAX2701 1050 1800 2100 1050 1250 2100 2500
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
ELECTRICAL CHARACTERISTICS (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
PARAMETERS Group Delay Group Delay Mismatch (Note Output Impedance Output Impedance Mismatch Output Voltage (Note CONDITIONS IIN1+ IOUT1, -1dB frequency QIN1+ QOUT1, -1dB frequency Between channel from 100kHz -1dB IOUT1, QOUT1, -1dB bandwidth Between IOUT1 QOUT1, -1dB bandwidth -1dB compression point, IOUT1, QOUT1 -1dB bandwidth (Note -3dB bandwidth IIN2+, IIN2-, QIN2+, QIN2-, single-ended Between IIN2+ QIN2+ VAGC 0.5V VAGC 2.0V Mismatch between IIN2 IOUT2 QIN2 QOUT2, 0.5V VAGC Gain Correction Disabled Gain Correction Enabled (2dB initial mismatch) -0.6 dB/V degrees Vp-p UNITS Vp-p
BASEBAND STAGE (IIN2+ IOUT2, QIN2+ QOUT2) Channel Bandwidth Input Impedance Input Impedance Mismatch Voltage Gain
Voltage Gain Mismatch (Note
VGA2 Gain Slope Noise Figure Phase shift (Note Group Delay Group Delay Mismatch (Note Output Impedance Output Impedance Mismatch Output Voltage (Note
Guaranteed monotonic over 0.5V <2V, VAGC =1.25V 1.1k 10dB gain IIN2+ IOUT2, QIN2+ QOUT2, -1dB Frequency Between channel from 100kHz -1dB frequency IOUT2 QOUT2, -1dB bandwidth Between IOUT2 QOUT2, bandwidth -1dB compression point, IOUT2 QOUT2 VAGC 2.0V VAGC 0.5V
1.8GHz 2.5GHz Direct Downconversion Receivers
ELECTRICAL CHARACTERISTICS (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
PARAMETERS POWER SUPPLY Power-Supply Ripple Rejection 3.0V 100mVPP frequency 300kHz, VOUT 0.3Vp-p, (Note Mixer VGA1 VGA2 CONDITIONS UNITS
MAX2700/MAX2701
Note This recommended operating frequency range. parts have been characterized over specified frequency range. Operation outside this range possible guaranteed. Note Guaranteed design characterization. Note matched input output 1960MHz, 1965MHz MAX2700; 2400MHz, 2405MHz MAX2701; -30dBm tone. Note Mixer IIP3 test. MAX2700, RFIN matched 1960MHz. RFIN, apply 1964.2MHz, 1968.2MHz, -25dBm tone, measure product power level 200kHz. MAX2701, RFIN matched 2400MHz. RFIN, apply 2404.2MHz, 2408.2MHz, -25dBm tone, measure product power level 200kHz. Note Mixer IIP2 test. MAX2700, RFIN matched 1960MHz. RFIN, apply 1964.2MHz, 1968.2MHz, -25dBm tone, measure product power level 4MHz. MAX2701, RFIN matched 2400MHz. RFIN, apply 2404.2MHz, 2408.2MHz, -25dBm tone, measure product power level 4MHz. Note Mixer spurious attenuation response. Mixer matched 1800MHz 900MHz doubler enabled). FRFIN 1801MHz, PRFIN -85dBm, FSPUR 3601.5MHz, PSPUR -60dBm. Measure 1MHz spurious 1.5MHz output. better than 38dBc spurious attenuation response, output spurious level should least 10dB lower than signal level. spurious product notation, denotes frequency final driving mixers inputs. Note Mixer gain specifications production tested over power range. Note filter output impedance 1.1k directly drive inputs since there minimal mismatch loss between source input impedance. Note Electrolytic bypass connected.
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700
TEMPERATURE
MAX2700-01
GAIN FREQUENCY TEMPERATURE
MAX2700-02
GAIN FREQUENCY TEMPERATURE
-45°C +25°C GAIN (dB)
MAX2700-03
-45°C +25°C
(mA)
+25°C
+85°C GAIN (dB) +85°C
-45°C
+85°C
HIGH-GAIN MODE 1700 1800 1900 2000 2100 LOW-GAIN MODE 1700 1800 1900 2000 2100 FREQUENCY (MHz)
FREQUENCY (MHz)
REVERSE ISOLATION FREQUENCY GAIN MODE
MAX2700-04
NOISE FIGURE FREQUENCY TEMPERATURE
-45°C HIGH-GAIN MODE 1700 1750 1800 1850 1900 FREQUENCY (MHz) 1950 2000 +25°C +85°C
MAX2700-05
(dB)
LOW-GAIN MODE
(dB) 1900 2000 2100
HIGH-GAIN MODE
1700 1800 FREQUENCY (MHz)
1.8GHz 2.5GHz Direct Downconversion Receivers
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700/MAX2701
MAX2700
NOISE FIGURE FREQUENCY TEMPERATURE
MAX2700-06
IIP3 TEMPERATURE
MAX2700-07
IIP3
IIP3 (dBm) HIGH-GAIN MODE LOW-GAIN MODE
MAX2700-08
LOW-GAIN MODE
+85°C
IIP3 (dBm)
(dB)
+25°C -45°C LOW-GAIN MODE 1700 1800 1900 2000 FREQUENCY (MHz)
HIGH-GAIN MODE
TEMPERATURE (°C)
2.50 2.75 3.00 3.25 3.50
MIXER VOLTAGE GAIN FREQUENCY TEMPERATURE
MAX2700-09
MIXER VOLTAGE GAIN FREQUENCY TEMPERATURE
MAX2700-10
MIXER VOLTAGE GAIN FREQUENCY POWER
VOLTAGE GAIN (dB) -16dBm -10dBm
MAX2700-11
VOLTAGE GAIN (dB)
-45°C
VOLTAGE GAIN (dB)
+25°C
-45°C
+25°C
DOUBLER ENABLED FREQUENCY (GHz) +85°C
+85°C
DOUBLER DISABLED FREQUENCY (GHz)
DOUBLER DISABLED FREQUENCY (GHz)
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700
MIXER NOISE FIGURE FREQUENCY TEMPERATURE
MAX2700-12
MIXER IIP3 TEMPERATURE
IIP3 (dBm) +25°C +85°C IIP2 (dBm) -45°C
MAX2700-13
MIXER IIP2 TEMPERATURE
MAX2700-14
(dB) 1800 1850 1900 1950 2000 2050 +25°C -45°C +85°C
+85°C
+25°C
-45°C
2100 2.60 2.85 DOUBLER ENABLED 3.10 3.35
DOUBLER ENABLED 2.60 2.85 3.10 3.35
FREQUENCY (MHz)
ERROR FREQUENCY
MAX2700-15
LO-RFIN ISOLATION FREQUENCY (INCLUDING BALUN)
MAX2700-16
LO-LNAIN ISOLATION FREQUENCY
DOUBLER DISABLED LO-LNAIN ISOLATION (dB)
MAX2700-17
2.00
DOUBLER DISABLED ERROR (DEGREES) 1.75 LO-RFIN ISOLATION (dB)
1.50
DOUBLER ENABLED DOUBLER DISABLED
DOUBLER ENABLED
DOUBLER ENABLED
1.25
1.00 FREQUENCY (GHz)
0.85 0.90 0.95 FREQUENCY (GHz) 1.00 1.05
0.85 0.90 0.95 FREQUENCY (GHz) 1.00 1.05
1.8GHz 2.5GHz Direct Downconversion Receivers
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700/MAX2701
MAX2700
MIXER BASEBAND BANDWIDTH
MAX2700-18
MIXER'S OUTPUT COMPRESSION POINT
MIXER OUTPUT (Vp-p) 0.56k 1.05k, 2.00k
MAX2700-19
BANDWIDTH (MHz) 0.50 0.75 1.00 1.25 1.50 1.75 BANDWIDTH BANDWIDTH
2.00
MAX2701
TEMPERATURE
MAX2701-20
GAIN FREQUENCY TEMPERATURE
MAX2701-21
GAIN FREQUENCY TEMPERATURE
GAIN (dB) +85°C +25°C -45°C
MAX2701-22
-45°C
(mA)
+85°C GAIN (dB)
+25°C
+25°C -45°C
+85°C
HIGH-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500
LOW-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2701
REVERSE ISOLATION FREQUENCY
MAX2701-23
NOISE FIGURE FREQUENCY TEMPERATURE
MAX2701-24
NOISE FIGURE FREQUENCY TEMPERATURE
MAX2701-25
HIGH-GAIN MODE
+85°C +25°C -45°C (dB)
(dB)
(dB)
LOW-GAIN MODE
+85°C
+25°C
-45°C
HIGH-GAIN MODE 2100 2200 2300 FREQUENCY (MHz) 2400 2500 LOW-GAIN MODE 2100 2200 2300 2400 2500 FREQUENCY (MHz)
2100 2200 2300 2400 2500 FREQUENCY (MHz)
IIP3 TEMPERATURE
MAX2701-26
IIP3
MAX2701-27
MIXER VOLTAGE GAIN FREQUENCY TEMPERATURE
MAX2701-28
IIP3 (dBm) LOW-GAIN MODE
IIP3 (dBm) HIGH-GAIN MODE LOW-GAIN MODE
-45°C VOLTAGE GAIN (dB) +25°C DOUBLER ENABLED +85°C
HIGH-GAIN MODE TEMPERATURE (°C)
2.50
2.75
3.00
3.25
3.50
FREQUENCY (GHz)
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2701
MIXER VOLTAGE GAIN FREQUENCY TEMPERATURE
MAX2701-29
MIXER VOLTAGE GAIN FREQUENCY POWER
VOLTAGE GAIN (dB) (dB) -16dBm -10dBm
MAX2701-30
MIXER NOISE FIGURE FREQUENCY TEMPERATURE
-45°C +25°C
MAX2701-31
-45°C VOLTAGE GAIN (dB) +25°C DOUBLER DISABLED +85°C
+85°C
DOUBLER ENABLED FREQUENCY (GHz)
2100 2200 2300 FREQUENCY (MHz) 2400 2500
FREQUENCY (GHz)
MIXER IIP3 TEMPERATURE
MAX2701-32
MIXER IIP2 TEMPERATURE
MAX2701-33
ERROR FREQUENCY
MAX2701-34
+25°C IIP2 (dBm)
ERROR (DEGREES) IIP3 (dBm) DOUBLER ENABLED
+25°C 2.60 2.85
+85°C
-45°C
-45°C
+85°C
DOUBLER DISABLED
DOUBLER ENABLED 3.10 3.35
DOUBLER ENABLED 2.60 2.85 3.10 3.35
FREQUENCY (GHz)
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2701
LO-RF ISOLATION FREQUENCY (INCLUDING BALUN)
MAX2701-35
LO-LNAIN ISOLATION FREQUENCY
MAX2701-36
DOUBLER DISABLED LO-RFIN ISOLATION (dB)
LO-LNAIN ISOLATION (dB)
DOUBLER DISABLED
DOUBLER ENABLED 1.05 1.10 1.15 FREQUENCY (GHz) 1.20 1.25
DOUBLER ENABLED 1.150
1.175
1.200 FREQUENCY (GHz)
1.225
1.250
MIXER BASEBAND BANDWIDTH
MAX2701-37
MIXER OUTPUT COMPRESSION POINT
MIXER OUTPUT (Vp-p) 1.05k 0.56k 2.00k
MAX2701-38
BANDWIDTH (MHz) 0.50 0.75 1.00 1.25 1.50 1.75 BANDWIDTH BANDWIDTH
2.00
1.8GHz 2.5GHz Direct Downconversion Receivers
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700/MAX2701
MAX2700/MAX2701
VOLTAGE GAIN VOLTAGE TEMPERATURE
-45°C
MAX2700/1-39
VOLTAGE GAIN MISMATCH TEMPERATURE
VOLTAGE GAIN (dB) (dB) -0.5 -1.0 -1.5 +85°C -45°C +25°C 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0.50
MAX2700/1-40
VGA1 NOISE FIGURE VOLTAGE TEMPERATURE
MAX2700/1-41
-45°C +85°C
VOLTAGE GAIN (dB)
+85°C
+25°C
+25°C
0.50 0.75 1.00 1.25 1.50 1.75 2.00
-2.0
0.75
1.00
1.25
1.50
1.75
2.00
VGA1 OUTPUT COMPRESSION POINT VOLTAGE
MAX2700/1-42
VGA1 BANDWIDTH
MAX2700/1-43
VGA2 VOLTAGE GAIN VOLTAGE TEMPERATURE
MAX2700/1-44
2.00
(PEAK PEAK)
2.0k 1.50 0.6k 1.25 1.6k 1.00 0.50 0.75 1.00 1.25 1.50 1.75 2.00 1.1k
VOLTAGE GAIN (dB)
1.75
VGA1 BANDWIDTH (MHz)
BANDWIDTH
-45°C
+85°C
+25°C
BANDWIDTH
0.50 0.75 1.00 1.25 1.50 1.75 2.00
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 (Figure +3.0V, +25°C, SHDN GAIN_SET VCC, X2_EN GND, CEXT+ connected CEXT-, -13dBm, 980MHz (MAX2700) 1200MHz (MAX2701), PLNAIN -30dBm, PRFIN -25dBm, LNAIN RFIN (single-ended input balun) driven from source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled IOUT2, QOUT2 AC-coupled 100; input VGAs, 20mVp-p 1MHz tone, VAGC 1.25V, unless otherwise noted.)
MAX2700/MAX2701
VGA2 VOLTAGE GAIN MISMATCH TEMPERATURE
MAX2700/1-45
VGA2 VOLTAGE GAIN MISMATCH WITH GAIN CORRECTION
MAX2700/1-46
VGA2 OUTPUT COMPRESSION POINT VOLTAGE
1.025k (PEAK-TO-PEAK
MAX2700/1-47
-45°C +25°C
INPUT MISMATCH GAIN CORRECTION ENABLED
MISMATCH (dB)
VOLTAGE GAIN (dB)
0.56k 0.25k
+85°C INPUT MISMATCH GAIN CORRECTION DISABLED
0.1k
0.50 0.75 1.00 1.25 1.50 1.75 2.00
0.50 0.75 1.00 1.25 1.50 1.75 2.00
0.75 1.00 1.25 1.50 1.75 2.00
VGA2 BANDWIDTH
MAX2700/1-48
VGA2 CROSSTALK
MAX2700/1-49
COMBINED VGA1 VGA2 TURN-ON TIME OFFSET CAPACITANCE*
MAX2700/1-50
CROSSTALK (dB)
VGA2 BANDWIDTH (MHz)
TURN-ON TIME (µs)
BANDWIDTH
BANDWIDTH
1100 OFFSET CAPACITANCE (nF)
*C19, C23, C30, schematic Figure represent offset capacitors. Time from SHDN SHDN VCC, until quiescent point settles within static quiescent point.
1.8GHz 2.5GHz Direct Downconversion Receivers
Description
NAME CEXTFUNCTION Inverting Input Port VGA2 Gain Imbalance Correction Circuitry. Connect external capacitor between CEXT- CEXT+ activate circuit. Short CEXT- CEXT+ disable. Noninverting Input Port VGA2 Gain Imbalance Correction Circuitry. Connect external capacitor between CEXT+ CEXT- activate circuit. Short CEXT- CEXT+ disable. Supply Voltage. Bypass with capacitors close possible. Logic-Level Enable Doubler Circuitry. Drive logic turn doubler (fLO fRFIN/2). Drive logic high bypass doubler (fLO fRFIN). Ground. Connect ground plane with minimal inductance. Input. Connect turn off. Off-chip match required. Gain Select Input. Drive logic high select high-gain mode. Drive logic select low-gain mode. Shutdown Control Input. Drive logic enable shutdown mode. Automatic Gain-Control Input AGC. Bypass this with 1000pF capacitor minimize coupling. Output. This requires external pullup inductor off-chip match. Mixer Q-Channel Baseband Output. Connect external series capacitor AC-couple output load. Noninverting VGA1, Q-Channel Baseband Input Inverting VGA1, Q-Channel Baseband Input Noninverting Offset Correction Input Q-Channel VGA1 Amplifier Inverting Offset Correction Input Q-Channel VGA1 Amplifier Q-Channel VGA1 Amplifier Baseband Output Inductive Common-Mode Degeneration Mixer Stages Noninverting VGA2, Q-Channel Baseband Input Inverting VGA2, Q-Channel Baseband Input Noninverting Offset Correction Input Q-Channel VGA2 Amplifier Inverting Offset Correction Input Q-Channel VGA2 Amplifier Q-Channel VGA2 Amplifier Baseband Output Mixers Inverting Input. narrow frequency bands between 1.8GHz 2.5GHz, port must matched using external matching components.
MAX2700/MAX2701
CEXT+
X2_EN LNAIN GAIN_SET SHDN LNAOUT MIX_Q QIN1+ QIN1DCQ1+ DCQ1QOUT1 MIXTNK QIN2+ QIN2DCQ2+ DCQ2QOUT2 RFIN+
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Description (continued)
NAME RFINIOUT2 DCI2DCI2+ IIN2IIN2+ IOUT1 DCI1DCI1+ IIN1IIN1+ MIX_I FUNCTION Mixers Noninverting Input. narrow frequency bands between 1.8GHz 2.5GHz, port must matched using external matching components. I-Channel VGA2 Baseband Output Inverting Offset Correction Input I-Channel VGA2 Amplifier Noninverting Offset Correction Input 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 I-Channel VGA1 Amplifier Noninverting Offset Correction Input 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 AC-couple output load. Input. Internally matched
Detailed Description
MAX2700/MAX2701 consist five major blocks: LNA, direct demodulator, VGAs, gain correction, bias circuits.
Low-Noise Amplifier
two-gain-level amplifier with noise figure high IIP3. Connect GAIN_SET switch amplifier low-gain mode that provides accurate gain step. High IIP3 minimizes cross-modulation between power leakage close-in interferers input. turned independent other functional blocks connecting LNAIN GND. External matching required match input output Figures matched 1960MHz 2400MHz over narrow bandwidth.
Demodulator
direct demodulator downconverts signal directly baseband signals. This architecture's main advantage that received signal amplified filtered baseband rather than some high intermediate frequency. This eliminates need expensive filter oscillator.
Furthermore, direct conversion scheme eliminates need image rejection, thereby relaxing bandpass filter selectivity requirements following LNA. direct downconverter consists highly linear double-balanced mixers, frequency doubler option, quadrature generator, baseband buffer amplifiers driven mixers' outputs. direct downconversion receiver, mixers have more stringent requirements mixer output linearity since they need handle large voltage swings baseband close-in interferers. signal applied differential input (RFIN+, RFIN-) direct downconversion receiver through off-chip balun. differential input structure results higher common-mode rejection second-order nonlinearity generated receiver's front end. differential input requires matching appropriate impedance balun. Some applications require bandpass filter between mixer, shown Figures attenuate residual transmit power leakage out-of-band spurious signals. mixer baseband buffers amplify mixer differential outputs convert them single-ended outputs (MIX_I, MIX_Q). These buffer amplifiers have
1.8GHz 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 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 X2_EN MULTIPLEXER DOUBLER GENERATOR
POLYPHASE QUADRATURE GENERATOR
BIAS BLOCK SHDN
BIAS BIAS
HIGH-GAIN
BLOCK
LNAOUT
LOW-GAIN
SHDN
LNAIN
GAIN_SET
very output impedance (<2). smallest load that should used 600. output mixers' buffers, baseband lowpass filters should used provide adjacent alternate channel selectivity. This reduces level adjacent channel close-in interferers input following baseband amplifier. signal applied externally input port. doubler circuit doubles signal frequency
before applied mixer port. Connect X2_EN ground enable doubler circuit. With this circuit enabled, required frequency half that carrier frequency. Connect X2_EN disable frequency doubler circuit frequency same carrier frequency. half frequency scheme results lower frequency lower cost VCOs. also reduces leakage receiver's input. mixer guaranteed
MAX2700/MAX2701
MIX_I
IIN1+
IIN1-
DCI1+
DCI1-
IOUT1
IIN2+
MIX_Q
QIN1+
QIN1-
LNAOUT
DCQ1+
DCQ1QOUT1 MIXTNK
5.6nH QIN2+
Figure MAX2700 Typical Operating Circuit (1960MHz)
LPF_1 2.2k LPF_2 2.2k 0.056µF 0.1µF 0.1µF 0.1µF 0.1µF 0.1µF 68pF 0.056µF INPUT 0.1µF CEXT1
1.8GHz 2.5GHz Direct Downconversion Receivers
IIN2DCI2+ DCI2IOUT2 RFINRFIN+ QOUT2
CEXT CEXT+
68pF
MAX2700
0.56µF 22pF 4.7nH
0.1µF
DOUBLER ENABLE/DISABLE
X2_EN LNAIN DETECT
I-CHANNEL LOAD 4.7nH INPUT
4.7nH
DUPLEXER 100pF GAIN_SET SHDN CTRL CTRL 100pF 0.01µF 68pF 0.056µF LPF_Q1 22pF 2.2k 68pF 1.5nH
GAIN SELECT
22pF Q-CHANNEL LOAD 68pF
T-LINE BALUN
FROM TRANSMITTER
ENABLE
1000pF
DCQ2- 0.56µF 0.1µF DCQ2+ QIN20.1µF
10µF
0.1µF 0.1µF
PINS 0.056µF 0.1µF 2.2k
1000pF 68pF
LPF_Q2 100pF 0.01µF
LPF_1 2.2k LPF_2
2.2k 0.056µF 0.1µF 0.1µF 68pF
INPUT 0.056µF 0.1µF IIN1+ IIN1DCI1+ DCI1IOUT1 IIN2+
0.1µF 0.1µF
0.1µF CEXT1
IIN2DCI2+ DCI20.56µF IOUT2 2.7nH 22pF 0.5pF 2.7nH 22pF QOUT2 0.1µF
CEXT CEXT+ X2_EN
68pF DOUBLER ENABLE/DISABLE
MIX_Q
QIN1+
QIN1-
DCQ1+
DCQ1QOUT1
LNAOUT
MIXTNK
QIN2+
5.6nH
Figure MAX2701 Typical Operating Circuit (2400MHz)
MAX2701
DETECT RFINRFIN+ I-CHANNEL LOAD LNAIN 0.5pF 1000pF GAIN_SET SHDN CTRL1 CTRL 100pF 1000pF 0.01µF 68pF 22pF 0.056µF 0.1µF 0.1µF 2.7nH 68pF LPF_Q1 2.2k 100pF 0.01µF 0.056µF 2.2k INPUT T-LINE BALUN 68pF
10pF
DUPLEXER
GAIN SELECT
FROM TRANSMITTER
ENABLE
DCQ2- 0.56µF 0.1µF DCQ2+ QIN20.1µF
Q-CHANNEL LOAD
10µF 0.1µF PINS 1000pF 68pF
1.8GHz 2.5GHz Direct Downconversion Receivers
MAX2700/MAX2701
LPF_Q2
MAX2700/MAX2701
OPEN OPEN 100pF 0.1µF 0.56µF 0.1µF IIN2+ 0.1µF 0.1µF 0.1µF OPEN 22pF 1.1k 3.6k 0.56µF 3.6k 1.1k 1.1k 68pF 10µF 1000pF OPEN
IIN1+
IIN1-
MIX_I
DCI1+
DCI1-
IOUT1
GAIN_SET 1000pF SHDN 1000pF 100pF 68pF LNAOUT MIX_Q QIN1+ QIN120 DCQ1+ DCQ1GND
QOUT1
MIXTNK
0.1µF 100pF 0.1µF
0.1µF
0.1µF
0.56µF (3pF) 3.6k
QIN2+
68pF (2pF) OPEN 22pF
1.8GHz 2.5GHz Direct Downconversion Receivers
68pF IIN235 0.56µF RFIN+ QOUT2 DCQ2DCQ2+ QIN2C27 22pF 22pF 68pF 0.1µF 0.1µF 5.6nH 3.6k 1.1k 1.1k 0.56µF 0.1µF 0.1µF 0.1µF CEXTC1 0.01µF CEXT+ DCI2+ DCI2IOUT2 LNAIN MAX2700 MAX2701 RFINR1 68pF 1000pF (10pF) (1nH) X2_EN (5pF) BALUN/TOKO/B4F
Figure MAX2700/MAX2701 Schematic
4.7nH (2.7nH) 4.7nH (2.7nH) 4.7nH (0.5pF) 0.01µF 0.56µF
X2EN
MAX2701EV ONLY.
1.8GHz 2.5GHz Direct Downconversion Receivers
operate without degrading performance over power range -10dBm -16dBm. quadrature generator consists wideband polyphase network. Each output polyphase filter buffered, amplified, then mixer's differential port. VGA2 Gain Mismatch Correction signal amplitudes outputs Qchannel VGA2 amplifiers compared, difference corrected differential feedback network associated with gain control circuitry. Differential amplitude information extracted single external capacitor across pins (CEXT- CEXT+). residual difference signal amplified back gain control network, increasing gain channel with smaller signal while decreasing gain larger signal's channel. This network will correct amplitude mismatches generated gain mismatches previous stages receiver (the mixer VGA1), well insertion-loss mismatch. correction network capable decreasing amplitude mismatch inputs VGA2 amplifiers <0.5dB amplitude mismatch. gain correction network disabled shorting CEXT- CEXT+.
MAX2700/MAX2701
Variable Gain Amplifier (VGA)
each baseband channel implemented variable gain amplifiers with equal gains. Each amplifier provides about 40dB voltage gain maximum setting 30dB gain control. first baseband (VGA1) cascaded wideband amplifier with differential input single-ended output. optimized noise high-gain state low-power dissipation sufficient linearity gain settings ensure desired compression performance. second baseband (VGA2) multistage wideband amplifier with differential inputs singleended output. each channel, connect baseband lowpass filter between VGA1 VGA2 provide additional channel selectivity adjacent channel. amplifiers driven single ended, complementary input should AC-coupled ground through matched source impedance. Offset Correction internal offset correction feedback amplifier associated with each removes offsets present VGAs. Offset correction preserves maximum output compression performance during maximum gain conditions. Each offset correction loop effectively AC-couples associated signal path. Each VGA1 network yields highpass corner frequency according following: f-3dB (Hz) 5300 (nF) (VAGC 2.0V) f-3dB (Hz) (nF) (VAGC 0.5V) where value capacitors, nanofarads, across DCI1+, DCI1- DCQ1+, DCQ1-. Note that corner frequency function gain setting, increasing with increasing gain. Each VGA2 network provides highpass corner frequency predicted following: f-3dB (Hz) (µF) where value capacitors, microfarads, across DCI2+, DCI2- DCQ2+, DCQ2-. time constants associated with offset correction networks limit turn-on time. applications where turn-on time critical, offset correction networks disabled shorting corresponding pins together (DCI1+ DCI1-, DCQ1+ DCQ1-, DCI2+ DCI2-, DCQ2+ DCQ2-).
Bias Circuit
Operate MAX2700/MAX2701 shutdown mode connecting SHDN GND, reducing current consumption 20µA. shutdown mode, bias current blocks turned through master shutdown circuit. applications where used, turn connecting LNAIN ground.
Applications Information
Matching
MAX2700/MAX2701 designed operate from 1.8GHz 2.1GHz 2.1GHz 2.5GHz, respectively. LNAs Figures optimized noise figure gain centered around 1960MHz 2400MHz, respectively. Operation other frequencies band requires reoptimization input output matching circuits. noise figure sensitive input matching losses input traces. input matching should optimized desired noise figure, gain, VSWR performance. High matching elements should used input. Proper board layout essential increase isolation between input. This minimizes leakage thus offset.
Demodulator Input Matching
input match demodulator Figure optimized 1960MHz 2400MHz operation, respectively. operation different frequency, matching circuit should reoptimized. Single-ended operation demodulator achieved through off-chip balun transformer. Figure balun, inductors, capacitors consti23
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
tute matching circuit differential demodulator input.
Layout Issues
properly designed board essential part RF/microwave circuit. controlled impedance lines frequency inputs outputs. lowinductance connections ground ground pins wherever components connected ground. Place decoupling capacitors close connections. proper chip operation, metal pad-
Mixer VGA1 Output Load Requirements
retain acceptable linearity performance, mixer VGA1 output loads should >600.
Table MAX2700 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 -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 53.97 41.4 29.5 19.9 10.1 -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 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 37.3 11.4 -23.1 -68.4 -99.5 -127 -152.8 -165 -176.7 162.4
Table MAX2700 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 -65.6 -66.3 -67.1 -67.3 -69.2 -70.1 -71.8 -74.5 -76.8 |S21| 0.731 0.763 0.772 0.76 0.758 0.717 0.678 0.603 0.634 0.634 0.621 52.5 42.9 31.3 21.2 10.3 -1.1 -10.7 -19.5 0.27 |S12| 0.018 0.018 0.016 0.014 0.014 0.015 0.014 0.022 0.028 0.03 0.033 37.6 13.4 |S22| 0.398 0.328 0.258 0.191 0.203 0.238 0.332 0.323 0.36 0.402 0.484 41.5 21.8 -114 -141 -105 -170 -178
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Table MAX2701 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 -110 -108 -108 -109 -111 -114.6 -120 -129 -139 |S21| 6.71 6.35 5.98 5.37 5.08 4.82 4.55 4.37 -32.9 -42.7 -49.8 -56.6 -63.4 -69.7 -75.7 -81.5 |S12| 0.036 0.04 0.042 0.042 0.043 0.043 0.04 0.037 0.035 -28.1 -42.6 -67.4 -104 -114 -122 |S22| 0.563 0.61 0.63 0.64 0.64 0.632 0.626 0.625 0.635 -162.5 -178 168.4 155.4 134.4
Table MAX2701 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 -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 -36.2 -45.2 -52.8 -60.4 -77.8 -87.8 -107 |S12| 0.025 0.029 0.032 0.033 0.036 0.037 0.038 0.035 0.029 -10.36 -21.6 -35.3 -50.4 -62.2 -76.5 -109 -120 |S22| 0.46 0.49 0.51 0.54 0.56 0.58 0.62 0.63 -157 -172 176.7 154.5 145.2 136.5
Table 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 -101.2 -105 -111.5 -116 -121 -128 -135
Table 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 -152 -161 -171 162.7
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Table MAX2700 Input S-Parameters (X2_EN X2_EN
DOUBLER DISABLED X2_EN 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 |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 -53.6
Table MAX2701 Input S-Parameters (X2_EN X2_EN
DOUBLER DISABLED X2_EN 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 |S11| 0.358 0.341 0.32 0.299 0.268 -53.4
FREQUENCY (GHz) 1000 1025 1050
FREQUENCY (GHz) -179 -175 -171 1.05 1.10 1.15 1.20 1.25
Chip Information
TRANSISTOR COUNT: 3307
1.8GHz 2.5GHz Direct Downconversion Receivers
Package Information
48L,TQFP.EPS
MAX2700/MAX2701
1.8GHz 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
Package Information (continued)
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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