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OL2385 Datasheet(PDF) 17 Page - NXP Semiconductors |
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OL2385 Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 85 page  OL2385 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 1.0 — 15 June 2016 17 of 85 NXP Semiconductors OL2385 Industrial RF transceiver 9.3 Local oscillator The radio frequencies needed for reception and transmission are created using a local oscillator. The signals for the reference namely crystal oscillator, mixer signals and the mixer phases for both transmission and reception are generated here. The purity, stability and matching of these signals define the maximum performance that can be achieved by the RF system; therefore the blocks are optimized for these performance parameters. The choice of the architecture of the Fractional-N_PLL and that of the voltage controlled oscillator (VCO) guarantees highest performance and flexibility with the minimum of current consumption. The transmission of FSK is achieved by modulation of the PLL and therefore the loop filter supports a high bandwidth to allow data rates up to 400kbit/s. Fig 6. Local Oscillator |
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