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MLX71121 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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MLX71121 Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 29 page MLX71121 300 to 930MHz FSK/OOK Receiver 39010 71121 Page 6 of 29 Data Sheet Rev. 012 Mar/15 1.4 Operating Modes The receiver offers two operating modes selectable by setting the corresponding logic level at pin ENRX. ENRX Description 0 Shutdown mode 1 Receive mode Note: ENRX is pulled down internally. The receiver’s start-up procedure is controlled by a sequencer circuit. It performs the sequential activation of the different building blocks. It also initiates the pre-charging of the data filter and data slicer capacitors in order to reduce the overall start-up time and current consumption during the start-up phase. At ENRX = 0, the receiver is in shutdown mode and draws only a few nA. The bias system and the reference oscillator are activated after enabling the receiver by a positive edge at pin ENRX. The crystal oscillator (RO) is turned on first. Then the crystal oscillation amplitude builds up from noise. After reaching a certain ampli- tude level at pin ROI, the whole IC is activated and draws the full receive mode current consumption ICC. This event is used to start the pre-charging of the external data path capacitors. Pre-charging is finished after 5504 clock cycles. After that time the data output pin DTAO output is activated. Fig. 2: Timing diagram of start-up and shutdown behavior 1.5 LNA Selection The receiver features two identical LNAs. Each LNA is a cascode amplifier with a voltage gain of approxi- mately 18dB. The actual gain depends on the antenna matching network at the inputs and the LC tank net- work between the LNA outputs and mixer input. LNA operation can be controlled by the LNASEL pin. LNASEL Description 0 LNA1 active, LNA2 shutdown Hi-Z LNA1 and LNA2 active 1 LNA1 shutdown, LNA2 active Pin LNASEL is internally pulled to VCC/2 during receive mode. Therefore both LNAs are active if LNASEL is left floating (Hi-Z state). valid data Hi-Z Hi-Z ENRX DTAO CC I SDN I RO I t onRO t onRX t SEQ |
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