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L8200G-P16-R Datasheet(PDF) 6 Page - Unisonic Technologies |
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L8200G-P16-R Datasheet(HTML) 6 Page - Unisonic Technologies |
6 / 6 page L8200 Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 6 of 6 www.unisonic.com.tw QW-R123-017.e SINGLE UNIVERSAL BLOCK DIAGRAM The following block diagram below shows the main elements of a single universal LNB. A single chip solution provides all the FET and mixer bias, control signal detect for polarization and band selection and all the necessary power management functions required within a single universal LNB. UTC L8200 Vertical Horizontal Gain Stages GaAs/HEMT FET Active Mixer IF Gain Stage LB Osc HB Osc VOUT VIN Set-top Box Receiver Polarization and band switching on the UTC L8200 uses the standard 13~17V and 22kHz as defined by Astra. The exception is that the devices voltage detector has a much tighter tolerance than required to increase field reliability. The single VIN pin is used internally for three functions, LNB and IC power supply, voltage detection and tone detection. The IC’s is self powering via an internal regulator which utilizes the 13~17V control voltage from the satellite receiver. The regulated voltage is used to supply the IC and is also outputted to the VOUT pin to provide the power supply for the remaining element of the LNB such as the IF amplifiers. The 13~17V from the receiver is feed via a tight tolerance voltage detector with integrated filtering which removes unwanted signals or interference. The results from the detectors output enables one of 2 bias circuits to turn one of either Fet1 or FET2 on. The internal tone detector allows the device to detect the 22kHz tone which is superimposed on the LNB power line (13~17V signal), this is achieved with no external filtering components. The tone detector rejects all unwanted signals including transients from other parts of the LNB system. The tone detector controls a drive circuits which powers and one of two oscillators, normally used to switch between low and high band in universal applications. The functional table below shows the operation of the FET and Mixer bias, oscillator output and the LNB power supply. FUNCTION TABLE INPUTS OUTPUTS VIN (V) FIN (kHZ) FET1 FET2 FET3 MIXER LB(V) HB(V) VOUT (V) <14.1 0 Disabled Active Active Active 5.0 0 5.0 >15.4 0 Active Disabled Active Active 5.0 5.0 <14.1 22 Disabled Active Active Active 0 5.0 5.0 >15.4 22 Active Disabled Active Active 0 5.0 5.0 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. |
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