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LM1868 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM1868 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 10 page  IC External Components (Application Circuit) Component Typical Comments Value C1 100 pF Removes tuner LO from IF input C2 01 mF Antenna coupling capacitor C4 C5 001 mF FM IF decoupling capacitors C6 C9 0005 mF AM smoothingFM de-emphasis network de-emphasis pole is R5 1k ( given by f1 j 1 2q (C6 a C9) R4 R6 R4 a R6 J C10 10 mF Regulator decoupling capacitor C11 01 mF Regulator decoupling capacitor C12 10mF AC coupling to volume control C13 01 mF Power supply decoupling C14 50 mF Power supply decoupling C15 01 mF Audio amplifier input coupling R7 3k Roll off signals from detector in the AM band to prevent radiation C16 0001 mF ( C17 100 mF Power amplifier feedback decoupling sets low frequency supply rejection R8 16k AM detector bias resistor Component Typical Comments Value R9 240k Set AGC time constant C19 1 mF ( C7 10 mF IF coupling C8 01 mF IF coupling C20 01 mF High frequency load for audio amplifier required to stabilize R10 5X ( audio amplifier C21 250 mF Output coupling capacitor R1 6k2 Sets Q of quadrature coil determining FM THD and recovered audio R2 12k IF amplifier bias R R3 5k6 Sets gain of AM IF and Q of AM IF output tank R4 10k Detector load resistor R6 50k Volume control C18 002 mF Power supply decoupling R11 R12 150X Terminates the ceramic filter biases FM IF input stage D1 1N4148 Optional Quickens the AGC response during turn on Coil and Tuning Capacitor Specifications C1 AM ANT 140 pF max 50 pF min FM 20 pF max 45 pF min AM OSC 82 pF max 50 pF min TOKO CY2-22124PT Trimmers 5 pF L1 640 mH Qu e 200 AM antenna RP e 3k5 F e 796 kHz 1 mVmeter induces (At secondary) approximately 100 mV open circuit at the secondary L0 L2 360 mH QU l 80 Fe 796 kHz TOKO RWO-6A5105 or equivalent Toko America 1250 Feehanville Drive Mount Prospect IL 60056 (312) 297-0070 TLH7909 – 9 L4 SWG 20 N e 3 T inner diameter e 5mm L5 SWG 20 N e 3 T inner diameter e 5mm L6 L e 044 mH N e 4 T Qu e 70 L7 SWG 20 N e 2 T inner diameter e 5mm CF2 107 MHz ceramic filter Murata MURATA SFE 107 mA or 2200 Lake Park Drive equivalent Smyrna GA 30080 (404) 436-1300 T1 Qu l 70 107 MHz L to resonate w82 pF 107 MHz TOKO KAC-K2318 or equivalent TLH7909 – 10 T2 Qu l 14 455 kHz L to resonate w180 pF 455 kHz TOKO 159GC-A3785 or equivalent TLH7909 – 11 CF1 TOKO CFU-090D or equivalent BW l 48 kHz 455 kHz TLH7909 – 12 T3 Apollo Electronics NS-107C or equivalent TLH7909 – 13 6 |
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