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MC13145FTA 데이터시트(PDF) 8 Page - LANSDALE Semiconductor Inc. |
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MC13145FTA 데이터시트(HTML) 8 Page - LANSDALE Semiconductor Inc. |
8 / 17 page www.lansdale.com Page 8 of 17 Issue 0 LANSDALE Semiconductor, Inc. ML13145 Description Description Symbol/Type Pin 21 Enable Enable 21 10 k Enable Enable the receiver by pulling the pin up to VCC. 26 VEE 27 VEE, Negative Supply VEE supply for the mixer IF output. 27 IF1+ IF1+ VEE 26 8 1st Mixer Outputs The Mixer is a differential open collector output configuration which is designed to use over a wide frequency range. The differential output of the mixer has back to back diodes across them to limit the out ut voltage swing and to revent ulling of the 28 IF1– IF1– 28 out ut voltage swing and to revent ulling of the VCO. Differential to single–ended circuit configuration and matching options are shown in the Test Circuit. Additional mixer gain can be achieved by matching the outputs for the desired passband Q. 22 Collector 25 On–board VCO Transistor The transistor has the emitter, base, collector, VCC, and VEE pins available. Internal biasing which is 23 Emitter VCC 24 compensated for stability over temperature is provided. It is recommended that the base pin is pulled up to VCC through an RFC chosen for the particular oscillator center frequency 24 Base Base 18, 26 particular oscillator center frequency . 25 VCC VEE Emitter 23 500 µA 2.0 mA VCC, Positive Supply Voltage A VCC pin is provided for the VCO. The operating supply voltage range is from 2.7 Vdc to 6.5 Vdc. 18, 26 VEE Collector 22 VEE, Negative Supply Voltage 29 Lin Adj2 Lin Adj2 29 31, VCC 2nd Mixer Linearity Control The mixer linearity control circuit accepts approximately 0 to 400 µA control current to set the dynamic range of the mixer. An Input Third Order Intercept Point, IIP3 of 17 dBm may be achieved at 400 µA of control current. IIP3 default with no external bias is 10 dBm. 30 Mxr2 In Mxr2 In 30 450 µ 2nd Mixer Input The mixer input impedance is broadband 50 Ω. 31 VCC 450 µA VCC, Positive Supply pp p |
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