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XE1209 Datasheet(PDF) 2 Page - Semtech Corporation |
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XE1209 Datasheet(HTML) 2 Page - Semtech Corporation |
2 / 10 page © Semtech 2005 www.semtech.com 2 XE1209 Ultra Low Power CMOS Transceiver 1 PIN DESCRIPTION Pin # Name Description 1 TEST Test pin 2 VSS Ground for digital 3 QIN Xtal pin or input for external clock 4 VDDA Supply voltage for analog 5 QOUT Xtal pin 6 VSSA Ground for analog 7 IREF Iref node for external resistance 8 VREF Vref node for external capacitance 9 SUPTEST Test pin 10 RE Receiver enable 11 INA RF input signal 12 INB RF input signal 13 VSSPA Ground for RF power amplifier 14 PAOUT RF power amplifier output 15 VDD Supply voltage for digital 16 DCLK Received data clock output 17 DATA Input/output bit stream or output of the carrier detector 18 DE Data enable for 3-wire communication 19 SD Data input for 3-wire communication 20 SC 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 2- level 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 Type Pins to be connected Value Tolerance Max. Temp. variation Cvdd Capacitor VDD - VSS 100 nF ± 10 % ± 5 % over -10 °C to 60 °C Cvref Capacitor VREF - VSS 47 nF ± 10 % ± 5 % over -10 °C to 60 °C Riref Resistance IREF - VSS 280 k Ω ± 1 % ± 100 ppm/K Xtal Crystal QIN - QOUT 32.768 kHz ± 20 ppm - 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. |
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