Maker : Semtech Corporation
Part No. : XE1209

  Datasheet PDF : XE1209.pdf
  Cross Reference : XE1209 Cross Reference
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Product Information

XE1209 Ultra Low Power CMOS Transceiver www.DataSheet4U.com XE1209 30 – 70 kH Ultra Low Power CMOS Transceiver GENERAL DESCRIPTION The XE1209 is a CMOS Ultra Low-Power transceiver for short-range low frequency RF data communications system. It uses 2-level Continuous Phase FSK modulation. The receiver section includes the preamplifier, the down-converter, and the channel filters, the demodulator and the bit synchronizer, which delivers synchronized data at the output. The transmitter section is composed of a Direct Digital Synthesizer (DDS), and the power amplifier generating a square-wave output current. The XE1209 has carrier detector to detect the presence of a signal at the carrier frequency. The local clock is based on a 32kHz crystal oscillator and a PLL to generate the required Local oscillator (LO) frequency. The XE1209 has a simple interface with an external microcontroller. KEY FEATURES • • • • • • Single chip transceiver Low cost Low external component count Ultra Low Power Stand-by mode Carrier detection mode Low-power receiver mode Unlicensed frequency band Short range applications; 1 to 3 meters APPLICATIONS • Remote control • Short Range Wireless data • Access control ORDERING INFORMATION Part number XE1209C012TRLF Temperature range -10°C to +60° Package SO-20 RoHS compliant Rev 1 August 2005 www.semtech.com 1 XE1209 Ultra Low Power CMOS Transceiver 1 PIN DESCRIPTION www.DataSheet4U.com Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TEST VSS QIN VDDA QOUT VSSA IREF VREF SUPTEST RE INA INB VSSPA PAOUT VDD DCLK DATA DE SD SC Description Test pin Ground for digital Xtal pin or input for external clock Supply voltage for analog Xtal pin Ground for analog Iref node for external resistance Vref node for external capacitance Test pin Receiver enable RF input signal RF input signal Ground for RF power amplifier RF power amplifier output Supply voltage for digital Received data clock output Input/output bit stream or output of the carrier detector Data enable for 3-wire communication Data input for 3-wire communication Clock input for 3-wire communication 2 TYPICAL APPLICATION The product is to be used in a system for low frequency RF data communications. The transmission is made with 2level CPFSK modulation. The modulated signal has a carrier frequency fc and a deviation frequency ∆f; the coding of the data is the following: fRFin = fc + ∆f ≡ “1” fRFin = fc - ∆f ≡ “0”. above shows the structure of the transceiver and the external components required by the application. A 3-wire bus allows the product to receive configuration data from a microcontroller. Note: pin TEST remains unconnected. 2.1 TYPICAL EXTERNAL COMPONENTS Besides the components needed for the RF communication itself, the following external components are required: Name Cvdd Cvref Riref Xtal Type Capacitor Capacitor Resistance Crystal Pins to be connected VDD - VSS VREF - VSS IREF - VSS QIN - QOUT Value 100 nF 47 nF 280 kΩ 32.768 kHz Tolerance ± 10 % ± 10 % ±1% ± 20 ppm Max. Temp. variation ± 5 % over -10 °C to 60 °C ± 5 % over -10 °C to 60 °C ± 100 ppm/K - 50 ppm over -10 to 60 °C The reference of the crystal used for Xtal is the following: “DS26 watch crystal” from Micro Crystal Switzerland 3 GENERAL FUNCTIONAL DESCRIPTION The XE1209 is composed of 6 main functional blocks: Receiver The receiver channel converts a 2-level CPFSK modulated signal into a bit stream. It is composed of the following blocks: preamplifier, down-converters (0-IF architecture), channel filters, limiters, demodulator, and bit synchronizer. © Semtech 2005 www.semtech.com 2 XE1209 Ultra Low Power CMOS Transceiver www.DataSheet4U.com Transmitter The transmitter performs the modulation of an input bit-stream. The main parts of this block are a DDS (Direct Digital Synthesizer), generating a digital signal with a modulated period, and a power amplifier generating a squarewave output current cont...

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