ASK Superheterodyne Receiver

www.DataSheet4U.com 19-2748; Rev 3; 11/03 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range General Description The MAX1473 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitudeshift-keyed (ASK) data in the 300MHz to 450MHz frequency range. Its signal range is from -114dBm to 0dBm. With few external components and a low-current power-down mode, it is ideal for cost- and power-sensitive applications typical in the automotive and consumer markets. The chip consists of a low-noise amplifier (LNA), a fully differential image-rejection mixer, an onchip phase-locked-loop (PLL) with integrated voltagecontrolled oscillator (VCO), a 10.7MHz IF limiting amplifier stage with received-signal-strength indicator (RSSI), and analog baseband data-recovery circuitry. The MAX1473 also has a discrete one-step automatic gain control (AGC) that drops the LNA gain by 35dB when the RF input signal is greater than -57dBm. The MAX1473 is available in 28-pin TSSOP and 32-pin thin QFN packages. Both versions are specified for the extended (-40°C to +85°C) temperature range. Features o Optimized for 315MHz or 433MHz ISM Band o Operates from Single 3.3V or 5.0V Supplies o High Dynamic Range with On-Chip AGC o Selectable Image-Rejection Center Frequency o Selectable x64 or x32 fLO/fXTAL Ratio o Low 5.2mA Operating Supply Current o <2.5µA Low-Current Power-Down Mode for Efficient Power Cycling o 250µs Startup Time o Built-In 50dB RF Image Rejection o Receive Sensitivity of -114dBm MAX1473 Ordering Information PART MAX1473EUI MAX1473ETJ TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 28 TSSOP 32 Thin QFN Applications Automotive Remote Keyless Entry Garage Door Openers Remote Controls Wireless Sensors Security Systems Home Automation Local Telemetry Systems Functional Diagram and Typical Application Circuit appear at end of data sheet. Pin Configurations LNASRC PWRDN LNAIN PDOUT XTAL1 XTAL2 TOP VIEW XTAL1 1 AVDD 2 LNAIN 3 LNASRC 4 AGND 5 LNAOUT 6 AVDD 7 MIXIN1 8 MIXIN2 9 AGND 10 IRSEL 11 MIXOUT 12 DGND 13 DVDD 14 28 XTAL2 27 PWRDN 26 PDOUT 25 DATAOUT 24 VDD5 AVDD 32 31 30 29 28 27 26 25 24 23 22 21 N.C. N.C. AGND LNAOUT AVDD MIXIN1 MIXIN2 AGND IRSEL 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 DATAOUT VDD5 DSP N.C. DFFB OPP DSN DFO MAX1473 23 DSP 22 DFFB 21 OPP 20 DSN 19 DFO 18 IFIN2 17 IFIN1 16 XTALSEL 15 AGCDIS MAX1473 20 19 18 17 9 DGND DVDD N.C. IFIN1 MIXOUT AGCDIS TSSOP THIN QFN ________________________________________________________________ Maxim Integrated Products XTALSEL IFIN2 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. www.DataSheet4U.com 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range MAX1473 ABSOLUTE MAXIMUM RATINGS AVDD5 to AGND ....................................................-0.3V to +6.0V AVDD to AGND ......................................................-0.3V to +4.0V DVDD to DGND......................................................-0.3V to +4.0V AGND to DGND.....................................................-0.1V to +0.1V IRSEL, DATAOUT, XTALSEL, AGCDIS, PWRDN to AGND .....................................-0.3V to (VDD5 + 0.3V) All Other Pins to AGND ..............................-0.3V to (VDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 28-Pin TSSOP (derate 12.8mW/°C above +70°C) .1025.6mW 32-Pin Thin QFN (derate 21.3mW/°C above +70°C).........................................................1702.1mW Operating Temperature Ranges MAX1473E__ ..................................................-40°C to +85°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering 10s) ..................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (3.3V OPERATION) (Typical Application Circuit, VDD = 3.0V to 3.6V, no RF signal applied, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1) PARAMETER Supply Voltage Supply Current Shutdown Supply Current Input Voltage Low Input Voltage High Input Logic Current High Image Reject Select (Note 2) DATAOUT Voltage Output Low DATAOUT Voltage Output High VOL VOH SYMBOL VDD IDD IPWRDN VIL VIH IIH fRF = 433MHz, VIRSEL = VDD fRF = 375MHz, VIRSEL = VDD/2 fRF = 315MHz, VIRSEL = 0V RL = 5kΩ 1.1 0.4 0.4 VDD - 0.4 V V VDD - 0.4 10 VDD - 0.4 VDD - 1.5 V CONDITIONS 3.3V nominal supply V P WRDN = VDD V P WRDN = 0V, VXTALSEL = 0V fRF = 315MHz fRF = 433MHz fRF = 315MHz fRF = 433MHz MIN 3.0 TYP 3.3 5.2 5.8 1.6 2.5 5.3 0.4 MAX 3.6 6.23 6.88 UNITS V mA µA V V µA 2 _______________________________________________________________________________________ www.DataSheet4U.com 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range DC ELECTRICAL CHARACTERISTICS (5.0V OPERATION) (Typical Application Circuit, VDD = 4.5V to 5.5V, no RF signal applied, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5.0V and TA = +25°C.) (Note 1) PARAMETER Supply Voltage Supply Current Shutdown Supply Current Input Voltage Low Input Voltage High Input Logic Current High Image Reject Select (Note 2) DATAOUT Voltage Output Low DATAOUT Voltage Output High VOL VOH SYMBOL VDD IDD IPWRDN VIL VIH IIH fRF = 433MHz, VIRSEL = VDD fRF = 375MHz, VIRSEL = VDD/2 fRF = 315MHz, VIRSEL = 0V RL = 5kΩ 1.1 0.4 0.4 VDD - 0.4 V V VDD - 0.4 10 VDD - 0.4 VDD - 1.5 V CONDITIONS 5.0V nominal supply V P WRDN = VDD V P WRDN = 0V, VXTALSEL = 0V fRF = 315MHz fRF = 433MHz fRF = 315MHz fRF = 433MHz MIN 4.5 TYP 5.0 5.2 5.7 2.3 2.8 6.2 0.4 MAX 5.5 6.04 6.76 UNITS V mA µA V V µA MAX1473 AC ELECTRICAL CHARACTERISTICS (Typical Application Circuit, VDD = 3.0V to 3.6V, all RF inputs are referenced to 50Ω, fRF = 315MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1). PARAMETER GENERAL CHARACTERISTICS Startup Time Receiver Input Frequency Maximum Receiver Input Level Sensitivity (Note 3) AGC Hysteresis LNA IN HIGH-GAIN MODE Power Gain Input Impedance 1dB Compression Point Input-Referred 3rd-Order Intercept S11LNA P1dBLNA IIP3LNA Normalized to 50Ω (Note 4) fRF = 433MHz fRF = 375MHz fRF = 315MHz 16 1 - j4.7 1 - j3.9 1 - j3.4 -22 -12 dBm dBm dB tON fRF PRFIN_MAX Modulation depth > 18dB PRFIN_MIN Average carrier power level Peak power level LNA gain from low to high Time for valid signal detection after V P WRDN = VOH 300 0 -120 -114 8 150 250 450 µs MHz dBm dBm dB ms SYMBOL CONDITIONS MIN TYP MAX UNITS _______________________________________________________________________________________ 3 www.DataSheet4U.com 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range MAX1473 AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, VDD = 3.0V to 3.6V, all RF inputs are referenced to 50Ω, fRF = 315MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1) PARAMETER LO Signal Feedthrough to Antenna Output Impedance Noise Figure LNA IN LOW-GAIN MODE Input Impedance (Note 4) 1dB Compression Point Input-Referred 3rd-Order Intercept LO Signal Feedthrough to Antenna Output Impedance Noise Figure Power Gain Voltage Gain Reduction MIXER Input Impedance Input-Referred 3rd-Order Intercept Output Impedance Noise Figure Image Rejection (not Including LNA Tank) Conversion Gain INTERMEDIATE FREQUENCY (IF) Input Impedance Operating Frequency 3dB Bandwidth RSSI Linearity RSSI Dynamic Range RSSI Level RSSI Gain AGC Threshold LNA gain from low to high LNA gain from high to low PRFIN < -120dBm PRFIN > 0dBm, AGC enabled ZIN_IF fIF Bandpass response 330 10.7 20 ±0.5 80 1.15 2.35 14.2 1.45 2.05 Ω MHz MHz dB dB V mV/dB V S11MIX IIP3MIX ZOUT_MIX NFMIX fRF = 433MHz, VIRSEL = VDD fRF = 375MHz, VIRSEL = VDD/2 fRF = 315MHz, VIRSEL = 0V 330Ω IF filter load Normalized to 50Ω 0.25 - j2.4 -18 330 16 42 44 44 13 dB dB dBm Ω dB AGC enabled (depends on tank Q) S22LNA NFLNA Normalized to 50Ω S11LNA P1dBLNA IIP3LNA Normalized to 50Ω fRF = 433MHz fRF = 375MHz fRF = 315MHz 1 - j4.7 1 - j3.9 1 - j3.4 -10 -7 -80 0.4 2 0 35 dB dB dB dBm dBm dBm S22LNA NFLNA Normalized to 50Ω SYMBOL CONDITIONS MIN TYP -80 0.12 - j4.4 2 dB MAX UNITS dBm 4 _______________________________________________________________________________________ www.DataSheet4U.com 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, VDD = 3.0V to 3.6V, all RF inputs are referenced to 50Ω, fRF = 315MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1) PARAMETER DATA FILTER Maximum Bandwidth DATA SLICER Comparator Bandwidth Maximum Load Capacitance Output High Voltage Output Low Voltage CRYSTAL OSCILLATOR fRF = 433MHz Crystal Frequency (Note 5) fXTAL fRF = 315MHz Crystal Tolerance Input Impedance From each pin to ground VXTALSEL = 0V VXTALSEL = VDD VXTALSEL = 0V VXTALSEL = VDD 6.6128 13.2256 4.7547 9.5094 50 6.2 MHz MHz ppm pF BWCMP CLOAD 100 10 VDD5 0 kHz pF V V BWDF 100 kHz SYMBOL CONDITIONS MIN TYP MAX UNITS MAX1473 Note 1: 100% tested at TA = +25°C. Guaranteed by design and characterization over temperature. Note 2: IRSEL is internally set to 375MHz IR mode. It can be left open when the 375MHz image rejection setting is desired. A 1nF capacitor is recommended in noisy environments. Note 3: BER = 2 x 10-3, Manchester encoded, data rate = 4kbps, IF b