MAX1470 315MHz Low-Power, +3V Superheterodyne Receiver General Description Features Operates from a Single +3.0V to +3.6V Supply The MAX1470 is a fully integrated low-power CMOS superheterodyne receiver for use with amplitude-shift- Built-In 53dB RF Image Rejection keyed (ASK) data in the 315MHz band. With few required -115dBm Receive Sensitivity* external components, and a low-current power-down 250s Startup Time mode, it is ideal for cost- and power-sensitive applica- Low 5.5mA Operating Supply Current tions in the consumer markets. The chip consists of a 315MHz low-noise amplifier (LNA), an image rejection 1.25A Low-Current Power-Down Mode for Efficient Power Cycling mixer, a fully integrated 315MHz phase-lock-loop (PLL), a 10.7MHz IF limiting amplifier stage with received-signal- 250MHz to 500MHz Operating Band strength indicator (RSSI) and an ASK demodulator, and (Image Rejection Optimized at 315MHz) analog baseband data-recovery circuitry. Integrated PLL with On-Board Voltage-Controlled Oscillator (VCO) and Loop Filter The MAX1470 is available in a 28-pin TSSOP package. Selectable IF Bandwidth Through External Filter Applications Remote Keyless Entry Complete Receive System from RF to Digital Data Out Garage Door Openers *See Note 2, AC Electrical Characteristics. Remote Controls Wireless Sensors Ordering Information Wireless Computer Peripherals PART TEMP RANGE PIN-PACKAGE Security Systems MAX1470EUI -40C to +85C 28 TSSOP Toys Video Game Controllers Typical Application Circuit and Pin Configuration appear at Medical Systems end of data sheet. Functional Diagram LNAOUT MIXIN1 MIXIN2 MIXOUT IFIN1 IFIN2 6 8 9 12 17 18 IF LIMITING AMPS 3 0 LNAIN LNA Q MAX1470 4 LNASRC 90 I RSSI 14 DIVIDE VCO DVDD BY 64 DATA FILTER 2,7 R R DF2 DF1 AV DD 100k 100k PHASE LOOP DETECTOR FILTER 13 DGND DATA SHUTDOWN CRYSTAL SLICER DRIVER 5,10 PEAK AGND DETECTOR 1 28 27 25 20 19 26 21 22 XTAL1 XTAL2 PWRDN DATAOUT DSN DSP PDOUT OPP DF 19-2135 Rev 1 9/14MAX1470 315MHz Low-Power, +3V Superheterodyne Receiver Absolute Maximum Ratings AV to AGND ......................................................-0.3V to +4.0V Operating Temperature Range DD DV to DGND......................................................-0.3V to +4.0V MAX1470EUI...................................................-40C to +85C DD All Other Pins Referenced to AGND...........-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 28-Pin TSSOP (derate 13mW/C above +70C).......1039mW 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 (Typical Application Circuit, V = +3.0V to +3.6V, no RF signal applied, T = -40C to +85C. Typical values are at V = +3.3V, T DD A DD A = +25C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 3.0 3.6 V DD Supply Current I 5.5 mA PWRDN = V DD DD Shutdown Supply Current I 1.25 A PWRDN = GND SHUTDOWN PWRDN Voltage Input Low V 0.4 V IL V V - 0.4 V PWRDN Voltage Input High IH DD DATAOUT Voltage Output Low V I = 100A 0.4 V OL DATAOUT DATAOUT Voltage Output High V I = -100A V - 0.4 V OH DATAOUT DD AC Electrical Characteristics (Typical Application Circuit, all RF inputs and outputs are referenced to 50, V = +3.3V, T = +25C, f = 315MHz, unless other- DD A RFIN wise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL CHARACTERISTICS Time from PWRDN deasserting to valid data Maximum Startup Time T 250 s ON out Maximum Receiver Input Level RFIN Modulation depth 60dB 0 dBm MAX Average carrier power level (Note 2) -115 Minimum Receiver Input Level, RFIN dBm MIN 315MHz Peak power level (Note 2) -109 Average carrier power level (Note 2) -110 Minimum Receiver Input Level, dBm 433.92MHz Peak power level (Note 2) -104 Receivers f 250 to 500 MHz RFIN LOW-NOISE AMPLIFIER (LNA) Input Impedance S11 Normalized to 50 (Note 3) 1 - j4 LNA 1dB Compression Point P1dB -22 dBm LNA Input-Referred 3rd-Order IIP3 -18 dBm LNA Intercept LO Signal Feedthrough to -95 dBm Antenna 0.12 - Output Impedance S22 Normalized to 50 LNA j4.4 Maxim Integrated 2 www.maximintegrated.com