SX1235IMLTRT Semtech

SX1235 WIRELESS & SENSING DATASHEET SX1235 Transceiver EN300 220 Category 1 Compliant Transceiver GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX1235 is a highly integrated RF transceiver optimized High sensitivity: down to -123 dBm at 1.2 kbps for operation compliant with ETSI EN 300 220 receiver High selectivity: 60 dB typ. ACR category 1. In conjunction with an external SAW filter the High linearity: 50 dB typ. of adjacent channel saturation SX1235 is designed to pass the category 1 testing with 80 dB Blocking immunity, 100 dB with SAW substantial regulatory margin, simplifying end-user production test requirements. The SX1235 retains the Image rejection of over 45 dB highly integrated architecture of the SX123x family, Low current: Rx = 9.3 mA, 100nA register retention minimizing external components while delivering the highest Programmable output power +20 dBm in 1 dB steps level of performance. For hybrid systems with non category 1 elements within an alarm system the SX1235 Optional high efficiency or fully regulated PA connections for reliable M2M performance and optimal battery offers the advantage of programmable narrow-band and lifetime wide-band communication modes without the need tomodify Voltage operation from 1.8 to 3.7 V external components. This makes the SX1235 suitable for integrated home automation, security and alarm systems Narrowband integrated synthesizer with a resolution of 61 Hz that require legacy compatibility. FSK, GFSK, MSK, GMSK and OOK modulation APPLICATIONS Automated, fast frequency correction & timing recovery Over 115 dB Dynamic Range RSSI Category 1 Social Alarm Systems Packet engine with CRC 64 byte FIFO Category 1 Fire, Smoke and Toxic Gas Detection Preamble and RSSI based channel activity detection Category 1 Lone Worker Systems Home and Building Automation ORDERING INFORMATION Wireless Alarm and Security Systems Industrial Monitoring and Control MOQ / Part Number Package Delivery Multiple MARKETS SX1235IMLTRT QFN24 Tape & 3000 pieces Optimised for the EN 300-220-1 Category 1 Reel North America: FCC Part 15 and Japan: ARIB T-108 Rev 1 - December 2012 Page 1 www.semtech.comSX1235 WIRELESS & SENSING DATASHEET Table of contents Section Page 1. General Description ............................................................................................................................................... 10 1.1. Simplified Block Diagram ............................................................................................................................... 10 1.2. Pin and Marking Diagram ..............................................................................................................................11 1.3. Pin Description ...............................................................................................................................................12 2. Electrical Characteristics ....................................................................................................................................... 13 2.1. ESD Notice .................................................................................................................................................... 13 2.2. Absolute Maximum Ratings ........................................................................................................................... 13 2.3. Operating Range............................................................................................................................................ 13 2.4. ETSI Category 1 Specification .......................................................................................................................14 2.4.1. SAW Filter Specification............................................................................................................................ 14 2.4.2. Category 1 Test Conditions....................................................................................................................... 14 2.4.3. System Performance (Absolute Units) with a SAW as Defined in 2.4.1.................................................... 14 2.4.4. System Performance (Regulatory Margin)................................................................................................ 15 2.4.5. Measurement Configuration for Category 1 Testing ................................................................................. 15 2.4.6. 869 MHz Category 1 Reference Design Module SM1235 ........................................................................ 16 2.5. Circuit Specification ....................................................................................................................................... 18 2.5.1. Power Consumption.................................................................................................................................. 18 2.5.2. Frequency Synthesis................................................................................................................................. 18 2.5.3. Receiver .................................................................................................................................................... 19 2.5.4. Transmitter ................................................................................................................................................ 20 2.5.5. Digital Specification................................................................................................................................... 21 3. Chip Description .................................................................................................................................................... 22 3.1. Power Supply Strategy .................................................................................................................................. 23 3.2. Low Battery Detector ..................................................................................................................................... 23 3.3. Frequency Synthesis .....................................................................................................................................24 3.3.1. Reference Oscillator.................................................................................................................................. 24 3.3.2. CLKOUT Output........................................................................................................................................ 24 3.3.3. PLL Architecture........................................................................................................................................ 24 3.3.4. RC Oscillator ............................................................................................................................................. 26 3.4. Transmitter Description ..................................................................................................................................27 3.4.1. Architecture Description ............................................................................................................................ 27 3.4.2. Bit Rate Setting ......................................................................................................................................... 27 3.4.3. FSK Modulation......................................................................................................................................... 28 3.4.4. OOK Modulation........................................................................................................................................ 29 3.4.5. Modulation Shaping................................................................................................................................... 29 3.4.6. RF Power Amplifiers.................................................................................................................................. 29 3.4.7. High Power +20 dBm Operation ...............................................................................................................30 3.4.8. Over Current Protection ............................................................................................................................31 3.5. Receiver Description ......................................................................................................................................32 Rev 1 - December 2012 Page 2 www.semtech.com