EVALUATION KIT AVAILABLE MAX7044 300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter General Description Features The MAX7044 crystal-referenced phase-locked-loop +2.1V to +3.6V Single-Supply Operation (PLL) VHF/UHF transmitter is designed to transmit OOK/ASK Transmit Data Format OOK/ASK data in the 300MHz to 450MHz frequency Up to 100kbps Data Rate range. The MAX7044 supports data rates up to 100kbps, and provides output power up to +13dBm into a 50 load +13dBm Output Power into 50 Load while only drawing 7.7mA at 2.7V. Low 7.7mA (typ) Operating Supply Current* The crystal-based architecture of the MAX7044 eliminates Uses Small, Low-Cost Crystal many of the common problems with SAW-based transmitters Small 3mm x 3mm 8-Pin SOT23 Package by providing greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and Fast-On Oscillator: 250s Startup Time reduced temperature dependence. The MAX7044 also features a low supply voltage of +2.1V to +3.6V. These Applications improvements enable better overall receiver performance Remote Keyless Entry (RKE) when using the MAX7044 together with a superheterodyne Tire-Pressure Monitoring (TPM) receiver such as the MAX1470 or MAX1473. Security Systems Garage Door Openers A simple, single-input data interface and a buffered RF Remote Controls clock-out signal at 1/16th the crystal frequency make the Wireless Game Consoles MAX7044 compatible with almost any microcontroller or Wireless Computer Peripherals code-hopping generator. Wireless Sensors The MAX7044 is available in an 8-pin SOT23 package and is specified over the -40C to +125C automotive Ordering Information temperature range. PIN- TOP PART TEMP RANGE PACKAGE MARK MAX7044AKA+T -40C to +125C 8 SOT23 AEJW *At 50% duty cycle (315MHz, 2.7V supply, +13dBm output power). +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Typical Application Circuit Pin Configuration TOP VIEW f XTAL 3.0V 3.0V 1 8 XTAL2 XTAL1 + XTAL1 1 8 XTAL2 220pF 100nF 680pF 2 7 100nF V GND DD GND 2 7 V DD MAX7044 MAX7044 3 6 PAGND 3 6 DATA DATA INPUT ANTENNA DATA PAGND CLOCK PAOUT 4 5 CLKOUT 5 4 OUTPUT CLKOUT PAOUT (f = CLKOUT SOT23 f /16) XTAL 19-3221 Rev 5 4/17MAX7044 300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter Absolute Maximum Ratings V to GND .........................................................-0.3V to +4.0V Storage Temperature Range ............................ -60C to +150C DD All Other Pins to GND .............................. -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C DD Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 8-Pin SOT23 (derate 8.9mW/C above +70C) ..........714mW Soldering Temperature (reflow) .......................................+260C Operating Temperature Range ......................... -40C to +125C 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. Electrical Characteristics (Typical Application Circuit, all RF inputs and outputs are referenced to 50, V = +2.1V to +3.6V, T = -40C to +125C, unless DD A otherwise noted. Typical values are at V = +2.7V, T = +25C, unless otherwise noted.) (Note 1) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM PERFORMANCE Supply Voltage V 2.1 3.6 V DD V at 50% duty DATA 7.7 14.1 cycle (Notes 3, 4) f = 315MHz RF PA on (Note 5) 13.8 25.4 PA off (Note 6) 1.7 2.8 Supply Current I mA DD (Note 2) V at 50% duty DATA 8.0 14.4 cycle (Notes 3, 4) f = 433MHz RF PA on (Note 5) 14.0 25.7 PA off (Note 6) 1.9 3.1 V < V for T < +25C 40 130 DATA IL A Standby Current I more than WAIT nA STDBY time (Notes 4, 7) T < +125C 550 2900 A Frequency Range (Note 4) f 300 450 MHz RF Data Rate (Note 4) 0 100 kbps Modulation Depth (Note 8) ON to OFF P ratio 90 dB OUT T = +25C, A 9.6 12.5 15.4 V = +2.7V DD Output Power, PA On f = 300MHz to T = +125C, RF A P 5.9 9.0 12.0 dBm OUT (Notes 4, 5) 450MHz V = +2.1V DD T = -40C, A 13.1 15.8 18.5 V = +3.6V DD Oscillator settled to within 50kHz 220 Turn-On Time t s ON Oscillator settled to within 5kHz 450 f = 315MHz 48 Transmit Efficiency with CW RF % (Notes 5, 9) f = 433MHz 47 RF f = 315MHz 43 Transmit Efficiency with 50% OOK RF % (Notes 3, 9) f = 433MHz 41 RF Maxim Integrated 2 www.maximintegrated.com