MAX1472 19-2872 Rev 4 6/12 300MHz-to-450MHz Low-Power, Crystal-Based ASK Transmitter General Description Features The MAX1472 is a crystal-referenced phase-locked 2.1V to 3.6V Single-Supply Operation loop (PLL) VHF/UHF transmitter designed to transmit Low 5.3mA Operating Supply Current* OOK/ASK data in the 300MHz to 450MHz frequency range. The MAX1472 supports data rates up to Supports ASK with 90dB Modulation Depth 100kbps, and adjustable output power to more than Output Power Adjustable to More than +10dBm +10dBm into a 50 load. The crystal-based architec- ture of the MAX1472 eliminates many of the common Uses Small Low-Cost Crystal problems with SAW transmitters by providing greater Small 3mm 3mm 8-Pin SOT23 Package modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced Fast-On Oscillator 220s Startup Time temperature dependence. Combined, these improve- ments enable better overall receiver performance when using a superheterodyne receiver such as the MAX1470 or MAX1473. The MAX1472 is available in a 3mm x 3mm 8-pin SOT23 package and is specified for the automotive (-40C to +125C) temperature range. An evaluation kit *At 50% duty cycle (315MHz, 2.7V supply, +10dBm output is available. Contact Maxim Integrated Products for power) more information. Applications Ordering Information Remote Keyless Entry TEMP PIN- TOP PART RANGE PACKAGE MARK RF Remote Controls MAX1472AKA+T -40C to +125C 8 SOT23 AEKS Tire Pressure Monitoring Security Systems +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Radio-Controlled Toys Wireless Game Consoles Wireless Computer Peripherals Wireless Sensors Typical Application Circuit Pin Configuration TOP VIEW * + 1 XTAL1 XTAL2 8 + 3.0V XTAL1 1 8 XTAL2 2 GND V 7 DD MAX1472 50 GND 2 7 V DD 220pF 680pF ANTENNA MAX1472 3 PAGND DATA 6 PAGND 3 6 DATA DATA INPUT 4 PAOUT ENABLE 5 PAOUT 4 5 ENABLE STANDBY OR POWER-UP SOT23 *Optional power adjust resistor. 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE300MHz-to-450MHz Low-Power, Crystal-Based ASK Transmitter ABSOLUTE MAXIMUM RATINGS V to GND ..........................................................-0.3V to +4.0V Operating Temperature Range .........................-40C to +125C DD All Other Pins to GND ................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +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 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, output power is referenced to 50 , V = 2.1V to 3.6V, V = V , T = -40C to +125C, unless DD ENABLE 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 = V ENABLE DD 5.3 9.4 (Note 2) V = V , ENABLE DD f = 315MHz 9.1 16.6 RF V = V DATA DD V = V , ENABLE DD 1.5 2.3 V = 0V DATA Supply Current I mA DD V = V ENABLE DD 5.7 (Note 2) V = V , ENABLE DD f = 433MHz 9.6 RF V = V DATA DD V = V , ENABLE DD 1.7 2.7 V = 0V DATA V < V , T < +85C (Note 3) 5 350 nA ENABLE IL A Standby Current I STDBY V < V T < +125C (Note 3) 1.7 A ENABLE IL A Frequency Range f (Note 1) 300 450 MHz RF Data Rate (Note 3) 0 100 kbps Modulation Depth ON to OFF P ratio (Note 4) 90 dB OUT T = +25C, V = 2.7V (Notes 5, 6) 7.3 10.3 12.8 A DD Output Power P T = + 125 C , V = 2.1V ( N otes 5, 6) 3.3 6.0 dBm OUT A D D T = -40C, V = 3.6V (Notes 5, 6) 13.7 16.2 A DD To f < 50kHz (Note 7) 220 OFFSET Turn-On Time t s ON To f < 5kHz (Note 7) 450 OFFSET f = 315MHz (Note 8) 43.6 RF Transmit Efficiency with CW % f = 433MHz (Note 8) 41.3 RF f = 315MHz (Note 9) 37.6 Transmit Efficiency at 50% RF % Duty Cycle f = 433MHz (Note 9) 35.1 RF 2 MAX1472