SX1223I073TRT Semtech

SX1223 SX1223 425 475 MHz / 850 950 MHz Integrated UHF Transmitter GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX1223 is a single chip transmitter operating in RF output power: up to +10 dBm UHF frequency bands including the 434, 869 and 915 Low power consumption: MHz license-free ISM (Industrial Scientific and T = 25.8 mA 10 dBm (typical) X Medical) bands. Its highly integrated architecture Supply voltage down to 2.0 V allows for minimum external components while Data rate from 1.2 to 153.6 kbit/s maintaining design flexibility. All major RF On-chip frequency synthesizer communication parameters are programmable and Continuous phase 2-level FSK modulation most of them can be set dynamically. The SX1223 offers the advantage of high data rate communication Very small RoHS green package (TQFN24, 4mm x 4mm) at rates of up to 153.6 kbit/s. The SX1223 is optimized for low cost applications while offering high RF output power. The device is suitable for applications which have to satisfy either the European ORDERING INFORMATION (ETSI-300-220) or the North American (FCC part 15) Part number Temperature Package regulatory standards. range (1) APPLICATIONS SX1223I073TRT -40 C to +85 C TQFN24 (1) TR refers to tape & reel. Automated Meter Reading (AMR) T refers to Lead Free package. Home Automation and Access Control This device is WEEE and RoHS compliant. High-Quality Speech, Music and Data over RF Rev 5 May 2007 www.semtech.com SX1223 Table of Contents 1 Functional Block Diagram .................................................................................................................. 3 2 Pin description..................................................................................................................................... 4 3 Electrical Characteristics.................................................................................................................... 5 3.1 Absolute Maximum Operating Ranges.................................................................................................. 5 3.2 Specifications ........................................................................................................................................ 5 3.2.1 Operating Range ................................................................................................................................... 5 3.2.2 Electrical Specifications......................................................................................................................... 5 4 General description............................................................................................................................. 7 4.1 Frequency synthesizer........................................................................................................................... 7 4.1.1 General Structure .................................................................................................................................. 7 4.1.2 Crystal Oscillator ................................................................................................................................... 8 4.1.3 VCO....................................................................................................................................................... 8 4.1.4 Charge Pump ...................................................................................................................................... 10 4.1.5 Loop Filter............................................................................................................................................ 10 4.1.6 Lock Detect.......................................................................................................................................... 11 4.2 Modulator............................................................................................................................................. 11 4.2.1 Introduction.......................................................................................................................................... 11 4.2.2 Data Interface...................................................................................................................................... 11 4.2.3 Bit Rate Setting for MW1 and MW2 .................................................................................................... 12 4.2.4 Deviation Setting for MW1 and MW2 .................................................................................................. 12 4.2.5 Shaping for MW1 and MW2................................................................................................................ 13 4.2.6 Modulator Saturation for MW1 and MW2............................................................................................ 13 4.2.7 Summary of Modulator Settings for MW1 and MW2........................................................................... 13 4.2.8 Frequency deviation setting for MW3.................................................................................................. 13 4.3 Power Amplifier ................................................................................................................................... 14 4.4 Voltage regulators ............................................................................................................................... 14 5 Serial Interface definition and Principles of operation.................................................................. 15 5.1 Serial Control Interface........................................................................................................................ 15 5.2 Configuration and Status registers ...................................................................................................... 16 5.2.1 Operating Modes ................................................................................................................................. 16 5.2.2 Other Settings...................................................................................................................................... 17 5.2.3 Optional and Test Parameters ............................................................................................................ 19 6 Application Information .................................................................................................................... 21 6.1 Matching network of the transmitter .................................................................................................... 21 6.2 Reference crystal for the frequency synthesizer ................................................................................. 22 6.3 Loop filter components ........................................................................................................................ 22 6.4 Recommended modulation conditions ................................................................................................ 22 6.5 TYPICAL APPLICATION SCHEMATICS ............................................................................................ 23 7 Packaging information...................................................................................................................... 24 Semtech 2007 www.semtech.com 2