xe1209 Semtech Corporation, xe1209 Datasheet
xe1209
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xe1209 Summary of contents
Page 1
... 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. Rev 1 August 2005 Ultra Low Power CMOS Transceiver ...
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... 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 composed of the following blocks: preamplifier, down-converters (0-IF architecture), channel filters, limiters, demodulator, and bit synchronizer. © ...
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... OSC) stored in the configuration register), • a carrier detector mode (M2), where only the carrier detector is active, • a transmitter mode (M3), where the transmitter is powered on, • A receiver mode (M4), where the receiver is powered on. © Semtech 2005 Ultra Low Power CMOS Transceiver 3 XE1209 www.semtech.com ...
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... OPERATING RANGES Conditions Min External oscillator, 32.735 VDD=2.6 V, temp=25 °C Full range of supply and temperature Full range of supply and temperature Full range of supply and temperature Full range of supply and temperature 4 XE1209 off off ON / off AND EXTERNAL Typ Max Unit -40 ...
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... Rsource=100Ω,BER=10 At RFSmin -1 -4 Rsource=100Ω,BER=10 At RFSmin 30 -4 Rsource=100Ω,BER=10 FC=36.86 kHz, DSB - - FC=36.86 kHz - 3 rising edges measured 140 at output in a 900us time 400 window 5 XE1209 Typ Max Unit 0.15 1 µ µA 95 120 µA 200 300 µA 110 138 mA 60 ...
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... The figure below shows the shapes of the signals when example, ISINK=110 mA. The transmitter processes the input data in real time without any additional sampling or filtering, which means that the data rate does not depend on the XE1209. DDS output PA sink current © ...
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... In the applications where the carrier detector is turned on for a relative long period (tens to hundreds of ms recommended to reset the block with a short transition to stand-by mode (RE=0). The timing diagram of the carrier detection is shown below when a RF signal is present at input and the function is programmed. © Semtech 2005 Ultra Low Power CMOS Transceiver 1/ XE1209 www.semtech.com ...
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... The enable signal DE goes low at the same time as the 8th falling edge of SC (that is, with a maximum delay between each other of 100 ns). From the rising edge of DE, the XE1209 will sample the data present the first 8 falling edges of SC, whatever is the following sequence on SC and SD. For a proper data transfer, the data on SD must be stable for 5 microseconds before and after each falling edge on SC ...
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... Upon start-up, a reset of the XE1209 is required to set the configuration register in a proper default mode. This is done by sending the binary word 'b00000000 to the circuit using the 3-wire bus, while setting RE to “0”. © Semtech 2005 Ultra Low Power CMOS Transceiver ...
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... Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Contact Information Wireless and Sensing Products Division Phone (805) 498-2111 Fax : (805) 498-3804 © Semtech 2005 Ultra Low Power CMOS Transceiver Semtech Corporation 200 Flynn Road, Camarillo, CA 93012 10 XE1209 www.semtech.com ...