PDF SX1238 Data sheet ( Hoja de datos )

Número de pieza	SX1238
Descripción	Fully Integrated Transceiver
Fabricantes	Semtech
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No Preview Available ! WIRELESS, SENSING & TIMING SX1238 - Fully Integrated Transceiver with +27dBm TX Power SX1238 DATASHEET VDD2 RXEN MODE RX RFI PREAMP VBAT1&2 VR_ANA VR_DIG LNA Power Distribution System Single to Differential Mixers RC Oscillator ANT IND PA PA0 Ramp & Control VDD1 PAout PDET TXEN TX RFO VR_PA Preamp/PA Tank Inductor Loop Filter Division by 2,4, or 6 Frac-N PLL Synthesizer XO 32 MHz RSSI AFC XTAL GND Frequency Synthesis Transmitter Blocks Receive Blocks Control Blocks Primary Analog Primary Digital RESET SPI RXTX DIO0 DIO1 DIO2 DIO3 DIO4 DIO5 GENERAL DESCRIPTION The SX1238 is a fully integrated ISM band transceiver optimized for use in the (FCC Part 15) 915 MHz band in the US and 868 MHz band in Europe with a minimum of external components. It offers a combination of high link budget and low current consumption in all operating modes. The 150 dB link budget is achieved by a low noise CMOS receiver front end and up to +27 dBm of transmit output power. This is made possible by a fully integrated front end consisting of a TR Switch, LNA and efficient PA. This makes SX1238 ideal for applications requiring extended range, high link budget, or operation in the presence of high interference. The Low-IF architecture of the SX1238 sees fast transceiver start times and demodulation predicated towards low modulation index and Gaussian filtered spectrally efficient modulation formats. APPLICATIONS  Automated Meter Reading  Wireless Sensor Networks  Home and Building Automation  Wireless Alarm and Security Systems  Industrial Monitoring and Control KEY PRODUCT FEATURES  +27 dBm - 500 mW RF output power  +27 dBm high efficiency PA  Programmable bit rate up to 300kbps  High sensitivity: -124 dBm at 1.2 kbps  863 - 870 MHz and 902 - 928 MHz  80 dB blocking Immunity  Low current, 100nA register retention  Fully integrated synthesizer with a resolution of 61 Hz  FSK, GFSK, MSK, GMSK and OOK modulations  Built-in bit synchronizer performing clock recovery  Sync word recognition  Preamble detection  115 dB+ dynamic range RSSI  Automatic RF sense with ultra-fast AFC  Packet engine up to 64 bytes with CRC  Built-in temperature sensor and low battery indicator ORDERING INFORMATION Part Number SX1238IMLTRT Delivery Tape & Reel MOQ / Multiple 3000 pieces  MLPQ 40 Package - Operating Range [-40;+85°C]  Pb-free, Halogen free, RoHS/WEEE compliant product SX1238 Rev.2, June 2014 ©2014 Semtech Corp. Page 1 www.semtech.com 1 page WIRELESS, SENSING & TIMING SX1238 High Power Transceiver IC DATASHEET Acronyms BOM BR BW CCITT CRC DAC ETSI FCC Fdev FIFO FIR FS FSK GUI IC ID IF IRQ ITU LFSR LNA LO Bill Of Materials Bit Rate Bandwidth Comité Consultatif International Téléphonique et Télégraphique - ITU Cyclic Redundancy Check Digital to Analog Converter European Telecommunications Standards Institute Federal Communications Commission Frequency Deviation First In First Out Finite Impulse Response Frequency Synthesizer Frequency Shift Keying Graphical User Interface Integrated Circuit IDentificator Intermediate Frequency Interrupt ReQuest International Telecommunication Union Linear Feedback Shift Register Low Noise Amplifier Local Oscillator LSB MSB NRZ OOK PA PCB PLL POR RBW RF RSSI Rx SAW SPI SR Stby Tx uC VCO XO XOR Least Significant Bit Most Significant Bit Non Return to Zero On Off Keying Power Amplifier Printed Circuit Board Phase-Locked Loop Power On Reset Resolution BandWidth Radio Frequency Received Signal Strength Indicator Receiver Surface Acoustic Wave Serial Peripheral Interface Shift Register Standby Transmitter Microcontroller Voltage Controlled Oscillator Crystal Oscillator eXclusive OR SX1238 Rev.2, June 2014 ©2014 Semtech Corp. Page 5 www.semtech.com 5 Page WIRELESS, SENSING & TIMING SX1238 High Power Transceiver IC DATASHEET 2.4. Chip Specification The tables below give the electrical specifications of the transceiver under the following conditions: Supply voltage VBAT1= VBAT2=VDDx=3.3 V, temperature = 25 °C, FXOSC = 32 MHz, FRF = 915 MHz, Pout = as indicated, 2-level FSK modulation without pre-filtering, FDA = 5 kHz, Bit Rate = 4.8 kb/s and terminated in a matched 50 Ohm impedance, unless otherwise specified. This specification is at room temperature. 2.4.1. Power Consumption Table 4 Power Consumption Specification Symbol IDDSL IDDIDLE IDDST Description Supply current in Sleep mode Supply current in Idle mode Supply current in Standby mode Conditions RXEN, TXEN = 0 RC oscillator enabled, RXEN, TXEN = 0 Crystal oscillator enabled, RXEN, TXEN = 0 Min Typ - 1.1 -2 - 1.3 Max Unit 2 uA - uA 1.5 mA IDDFS IDDR IDDT Supply current in Synthesizer mode Supply current in Receive mode Supply current in Transmit mode Measured at Antenna Port FSRx Modes; RXEN, TXEN = 0 RXEN = 1, TXEN = 0, MODE = 0 (low gain) RXEN = 1, TXEN = 0, MODE = 1 (high gain) TXEN = 1 ANT = +27 dBm, (Saturation) ANT = +26 dBm ANT = +17 dBm 2.4.2. Frequency Synthesis Table 5 Frequency Synthesizer Specification - 4.5 - 19.3 - 25.3 -- - 408 - 389 - 158 - mA - mA mA -- - mA - mA - mA Symbol FR FXOSC TS_OSC TS_FS TS_HOP FSTEP FRC Description Synthesizer frequency range Crystal oscillator frequency Crystal oscillator wake-up time Conditions Programmable See section [7.1] Frequency synthesizer wake-up time to PllLock signal Frequency synthesizer hop time at most 10 kHz away from the target frequency From Standby mode Frequency synthesizer step RC Oscillator frequency FSTEP = FXOSC/219 After calibration 200 kHz step 1 MHz step 5 MHz step 7 MHz step 12 MHz step 20 MHz step 25 MHz step Min 863 - - - - - - - - - - - - Typ - 32 250 60 20 20 50 50 50 50 50 61.0 62.5 Max Unit 928 MHz - MHz 500 us - us - us - us - us - us - us - us - us - Hz - kHz SX1238 Rev.2, June 2014 ©2014 Semtech Corp. Page 11 www.semtech.com 11 Page

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