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TH7122ENE Datasheet(PDF) 4 Page - Melexis Microelectronic Systems |
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TH7122ENE Datasheet(HTML) 4 Page - Melexis Microelectronic Systems |
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4 / 44 page  TH7122 27 to 930MHz FSK/FM/ASK Transceiver 39010 07122 Page 4 of 44 Data Sheet Rev. 008 June/07 1 Theory of Operation 1.1 General The main building block of the transceiver is a programmable PLL frequency synthesizer that is based on an integer-N topology. The PLL is used for generating the carrier frequency during transmission and for generating the LO signal during reception. The carrier frequency can be FSK-modulated either by pulling the crystal or by modulating the VCO directly. ASK modulation is done by on/off keying of the power amplifier. The receiver is based on the principle of a single conversion superhet. Therefore the VCO frequency has to be changed between transmit and receive mode. In receive mode, the default LO injection type is low-side injection. The TH7122 transceiver IC consists of the following building blocks: " Low-noise amplifier (LNA) for high-sensitivity RF signal reception with switchable gain " Mixer (MIX) for RF-to-IF down-conversion " IF amplifier (IFA) to amplify and limit the IF signal and for RSSI generation " Phase-coincidence FSK demodulator with external ceramic discriminator or LC tank " Operational amplifier (OA1), connected to demodulator output " Operational amplifier (OA2), for general use " Peak detector (PKDET) for ASK detection " Control logic with 3wire bus serial control interface (SCI) " Reference oscillator (RO) with external crystal " Reference divider (R counter) " Programmable divider (N/A counter) " Phase-frequency detector (PFD) " Charge pump (CP) " Voltage controlled oscillator (VCO) with internal varactor " Power amplifier (PA) with adjustable output power 1.2 Technical Data Overview ! Frequency range: 300 MHz to 930 MHz in programmable user mode ! Extended frequency range with external VCO varactor diode: 27 MHz to 930 MHz ! 315 MHz, 433 MHz, 868 MHz or 915 MHz fixed- frequency settings in stand-alone mode ! Power supply range: 2.2 V to 5.5 V ! Temperature range: -40 °C to +85 °C ! Standby current: 50 nA ! Operating current in receive: 6.5 mA (low gain) ! Operating current in transmit: 12 mA (at -2 dBm) ! Adjustable RF power range: -20 dBm to +10dBm ! Sensitivity: -105 dBm at FSK with 180 kHz IF filter BW ! Sensitivity: -107 dBm at ASK with 180 kHz IF filter BW ! Max. data rate with crystal pulling: 20 kbps NRZ ! Max. data rate with direct VCO modulation: 115 kbps NRZ ! Max. input level: -10 dBm at FSK and -20 dBm at ASK ! Input frequency acceptance: ± 10 to ± 150 kHz (depending on FSK deviation) ! FM/FSK deviation range: ±2.5 to ±80 kHz ! Analog modulation frequency: max. 10 kHz ! Crystal reference frequency: 3 MHz to 12 MHz ! External reference frequency: 1 MHz to 16 MHz 1.3 Note on ASK Operation Optimum ASK performance can be achieved by using an 8-MHz crystal for operation at 315 MHz, 434 MHz and 915 MHz. For details please refer to the software settings shown in sections 7.4 and 7.6. FSK operation is the preferred choice for applications in the European 868MHz band. |
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