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L8115 Datasheet(PDF) 10 Page - Unisonic Technologies |
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L8115 Datasheet(HTML) 10 Page - Unisonic Technologies |
10 / 13 page UTC L8115 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 10 QW-R123-005,B * Stripline Elements * C1 * L2 * C3 C4 10nF Q1 *L1 C2 10nF CNB 47nF CSUB 47nF R1 33k 4.7nF LNB Downfeed R2 2k Rcal Fin Lov Csub HB LB G1 D1 CF1 G2 D2 D3 Gnd Cnb1 Vpol Vcc UTC L8115 SSOP20(150mil) Vcc G3 Cnb2 N/C NC NC SSOP20(150mil) Applications circuit 1 The following block diagram shows the main section of an LNB designed for use with the Astra series of satellites. The UTC L8115 is the core bias and control element of this circuit. The UTC provides the negative rail, FET bias control, polarisation switch control, tone detection and band switching with the minimum of external components. Compared to other discrete component solutions the UTC circuit reduces component count and overall size required. Single Universal LNB Block Diagram UTC L8115 Regulator Vertical Antenna Gain Stage GaAs/HEMTFET 2 Polarity Switch &Tone Detect Input Gain Stage GaAs/HEMTFET 3 Mixer Gain Stage ASTRA Universal Band 10.70GHz-12.75 GHz Horizontal Antenna 1 Gain Stage GaAs/HEMTFET Band Switch Output Local Osc 1 9.75 GHz - Low Band Local Osc 2 10.6GHz - High Band IF down feed 950-2050 MHz - Low Band 1100 - 2150 MHz - High Band + Tone detection and band switching is provided on the UTC L8115 devices. The following diagrams describes how this feature operates in an LNB and the external components required. The presence or absence of a 22kHz tone applied to pin FIN enables one of two outputs, LB and HB. A tone present enables HB and tone absent enables |
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