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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
Decimation & Filtering
Demodulator & Bit Synchronizer
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
Interpolation & Filltering Modulator
RSSI AFC
XTAL
GND
Frequency Synthesis
Transmitter Blocks
Receive Blocks
Control Blocks
Primary Analog Primary Digital
Packet Engine & 66 byte FIFO Control Registers - Shift Registers - SPI Interface
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
SX1238
High Power Transceiver IC
WIRELESS, SENSING & TIMING
Table of contents
DATASHEET
Section
Page
1. General Description ................................................................................................................................................ 6 1.1. Simplified Block Diagram ................................................................................................................................ 6 1.2. Pin and Marking Diagram .................................................................................................................................7 1.3. Pin Description .................................................................................................................................................8
2. Electrical Characteristics....................................................................................................................................... 10 2.1. ESD Notice.................................................................................................................................................... 10 2.2. Absolute Maximum Ratings .......................................................................................................................... 10 2.3. Operating Range........................................................................................................................................... 10 2.4. Chip Specification ...........................................................................................................................................11 2.4.1. Power Consumption............................................................................................................................... 11 2.4.2. Frequency Synthesis.............................................................................................................................. 11 2.4.3. Receiver ................................................................................................................................................. 12 2.4.4. Transmitter ............................................................................................................................................. 13 2.4.5. Front End Control.......................................................................................