EVALUATION KIT AVAILABLE MAX7057 300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter General Description Features The MAX7057 frequency-programmable UHF transmitter Programmable Frequency Operation with Single is designed to transmit ASK/FSK data at a wide range Crystal of frequencies from 300MHz to 450MHz. The MAX7057 Internal Variable Capacitor for Antenna Tuning with has internal tuning capacitors at the output of the power Single-Matching Network amplifier that are programmable for matching to an 100kbps Data Rate (NRZ) antenna or load. This allows the user to change to a new frequency and match the antenna at the new frequency +2.1V to +3.6V Single-Supply Operation simultaneously. The MAX7057 transmits at a data rate up < 12.5mA (FSK), < 8.5mA (ASK) DC Current Drain to 100kbps nonreturn-to-zero (NRZ) (50kbps Manchester < 1A Standby Current coded). Typical transmitted power into a 50 load is +9.2dBm with a +2.7V supply. The device operates from ASK/FSK Modulation +2.1V to +3.6V and typically draws under 12.5mA of 47% Carrier Tuning Range Using One Crystal current in FSK mode (8.5mA in ASK mode) when the antenna-matching network is designed to operate over Ordering Information the 315MHz to 433.92MHz frequency range. For narrower operating frequency ranges, the matching network can be PART TEMP RANGE PIN-PACKAGE redesigned to improve efficiency. The standby current is MAX7057ASE+ -40C to +125C 16 SO less than 1A at room temperature. +Denotes a lead(Pb)-free/RoHs-compliant package. The MAX7057 reference frequency from the crystal oscil- lator is multiplied by a fully integrated fractional-N phase- Pin Configuration locked loop (PLL). The multiplying factor of the PLL is set by a 16-bit number, with 4 bits for integer and 12 bits for fraction the multiplying factor can be anywhere between TOP VIEW 19 and 28. The 12-bit fraction in the synthesizer sets a + tuning resolution equal to the reference frequency divided CS 1 16 DVDD by 4096 frequency deviation can be set as low as 2kHz SDI 2 15 GPO MAX7057 and as high as 100kHz. The fractional-N synthesizer SCLK 3 14 DGND eliminates the problems associated with oscillator-pull- ing FSK signal generation. The MAX7057 has a serial PAGND 4 13 DIN peripheral interface (SPI) for selecting all the necessary PAOUT 5 12 ENABLE settings. ROUT 6 11 AGND The MAX7057 is available in a 16-pin SO package and PAVDD 7 10 XTAL1 is specified to operate in the -40C to +125C automotive 8 XTAL2 temperature range. AVDD 9 Applications RF Remote Controls Wireless Game Consoles Garage Door Openers Wireless Computer Home Automation Peripherals Typical Application Circuit and Functional Diagram appear Wireless Sensors Security Systems at end of data sheet. 19-4093 Rev 2 7/14MAX7057 300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter Absolute Maximum Ratings Supply Voltage, PAVDD, AVDD, DVDD to AGND, Operating Temperature .................................... -40C to +125C DGND, PAGND.................................................-0.3V to +4.0V Storage Temperature Range ............................ -65C to +150C All Other Pins............................ GND - 0.3V to VDD + 0.3V Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) .......................................+260C A 16-Pin SO (derate 8.7mW/C above +70C) ............695.7mW 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, 50 system impedance, tuned for 315MHz to 433.92MHz operation, V = V = V = +2.1V AVDD DVDD PAVDD to +3.6V, f = 300MHz to 450MHz, f = 16MHz, T = -40C to +125C, unless otherwise noted. Typical values are at V RF CRYSTAL A AVDD = V = V = +2.7V, T = +25C, unless otherwise noted. All min and max values are 100% tested at T = +125C, and DVDD PAVDD A A guaranteed by design and characterization over temperature, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PAVDD, AVDD, and DVDD connected to Supply Voltage V 2.1 2.7 3.6 V DD power supply, V DD f = 315MHz 3.9 6.5 RF PA off, V at 0% DIN duty cycle (ASK) f = 433.92MHz 4.5 7.5 RF f = 315MHz 8.1 15.1 RF V at 50% duty DIN Supply Current I mA DD cycle (ASK) (Notes 1, 2, 3) f = 433.92MHz 8.5 15.0 RF f = 315MHz 12.2 23.7 V at 100% duty RF DIN cycle (FSK) (Note 1) f = 433.92MHz 12.4 22.4 RF T = +25C (Note 3) 0.8 A Standby Current I V < V T < +85C (Note 3) 1 6.4 A STDBY ENABLE IL A T < +125C 6.2 20.1 A DIGITAL I/O 0.9 x Input High Threshold V V IH V DVDD 0.1 x Input Low Threshold V V IL V DVDD Input Pulldown Sink Current 13 A Input Pullup Source Current 9 A V - DD Output-Voltage High V I = 500A (GPO) V OH SINK 0.37 Output-Voltage Low V I = 500A (GPO) 0.36 V OL SOURCE Maxim Integrated 2 www.maximintegrated.com