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Low data rate, low power sub-1GHz transmitter

Quantity $ per Unit Savings
1 - 9$2.980%
10 - 24$2.6810%
25 - 99$2.5415%
100 - 249$2.1727%
250 - 499$2.0332%
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In stock
Parameter NameParameter Value
Operating Temp Min Celsius-40.0
Operating Temp Max Celsius85.0
Operating Voltage Min Volt1.8
Operating Voltage Max Volt3.6
ECCN US5A992.c
ECCN EU5A002.a.2
Packing TypeTape And Reel
RoHs compliantEcopack3
Package NameVFQFPN 20 4x4x1.0

The STS1TX is a very low-power RF transmitter intended for RF wireless applications in the sub-1 GHz band. It is designed to operate both in the license-free ISM and SRD frequency bands at 169, 315, 433, 868, and 915 MHz, but can also be programmed to operate at other frequencies in the 300-348, 387-470, and 779-956 MHz bands. The air data rate is programmable from 1 to 500 kbps, and the STS1TX can be used in systems with channel spacing of 12.5/25 kHz, complying with the EN 300 220 standard. It uses very few discrete external components and integrates a configurable baseband modem, which supports data management and modulation. The data management handles the data in the proprietary fully-programmable packet format, and also allows the M-Bus standard compliance format (all performance classes).

An AES 128-bit encryption co-processor is available for secure data transfer. The STS1TX supports different modulation schemes: 2-FSK, GFSK, OOK, ASK, and MSK. Transmitted data bytes are buffered in FIFO (TX FIFO), accessible via the SPI interface for host processing.

Key features
  • Frequency bands: 150-174 MHz, 300-348 MHz, 387-470 MHz, 779-956 MHz
  • Modulation schemes: 2-FSK, GFSK, MSK, GMSK, OOK, and ASK
  • Air data rate from 1 to 500 kbps
  • Very low power consumption (21 mA TX at +11 dBm)
  • Programmable channel spacing (12.5 kHz min.)
  • Programmable output power up to +16 dBm
  • Fast startup and frequency synthesizer settling time (6 μs)
  • Integrated temperature sensor
  • Battery indicator and low battery detector
  • TX FIFO buffer (96 bytes each)
  • Configurability via SPI interface
  • AES 128-bit encryption co-processor
  • Fully integrated ultra low power RC oscillator
  • Wakeup on internal timer and on external event
  • Flexible packet length with dynamic payload length
  • Automatic CRC handling
  • FEC with interleaving
  • Whitening of data
  • Wireless M-BUS, EN 300 220, FCC CFR47 15 (15.205, 15.209, 15.231, 15.247, 15.249), and ARIB STD T-67, T93, T-108 compliant
  • QFN20 4x4 mm RoHS package
  • Operating temperature range from -40 °C to 85 °C