전자부품 데이터시트 검색엔진 |
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LA1784 데이터시트(PDF) 5 Page - Sanyo Semicon Device |
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LA1784 데이터시트(HTML) 5 Page - Sanyo Semicon Device |
5 / 50 page Operating Characteristics and Symbols Used in the Test Circuit Diagrams Switches (SW) Switch on = 1, SW off = 0 There are two switches that use signal transfer. — SW2: switches between the mixer input and the IF input. — SW4: switches between noise canceler input and IF output + noise canceler input. No. 6039-5/50 LA1784M Types of SG used PG1 (AC1) Used for noise canceler testing. A pulse generator and an AF oscillator are required. AC2 Used for FM front end testing. Outputs an 83 MHz signal. AC3 Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7 MHz signal. Stereo modulation must be possible. AC4 Used for AM testing. Outputs 1 MHz and 1.4 MHz signals. AC5 Used with the MRC. Can also be used for AF and OSC. Power supply VCC 8 V VCC1 5 V SD, stereo, seek/stop VCC2 0.1 V / 0.7 V / 2 V / 4 V These levels Keyed AGC, Mute ATT VCC3 0.1 V / 0.6 V / 2 V must be variable. HCC, SNC, SASC (MRC) • Trimmers (variable resistors) VR1 Separation adjustment VR2 Pilot cancellation adjustment • AC voltages VA1 AM/FM OSC Buff Pin 4 VA2 First IF output Pin 53 → CF → pin 51 load level (10.7 MHz) VA3 IF counter buffer Pin 23 (10.7 MHz/450 kHz) VA4 MPX OUT Left ch Pin 15 (AF) VA5 MPX OUT Right ch Pin 16 (AF) Test Points • DC voltages VD1 FM RF AGC voltage Pin 2 VD2 AM/FM SD, AM Tweet, FM stereo indicator Pin 26 VD3 AM/FM S-meter Pin 24 VD4 MRC output Pin 27 VD5 Mute drive output Pin 33 VD6 AM antenna damping voltage Pin 46 VD7 N.C. Gate time Pin 8 • Switches Parameter ON OFF SW1 AM/FM switching. The FE VCC is supplied to pin 62. FM AM SW2 FM IF switching. Pin 51/FE output FE IF OUT (A) AC3 (B) SW3 For conversion gain testing Conversion gain measurement (A) Other/purposes SW4 For switching between noise canceler input and IF output + noise canceler. AC1 (A) Other/purposes SW5 High-speed SD High-speed SD Other/purposes SW6 SEEK/STOP (IF BUFF ON/OFF) STOP Seek (IF buffer output) SW7 MUTE ATT 200 k Ω MUTE 200 k Ω OFF SW8 MUTE ATT 30 k Ω MUTE 30 k Ω OFF SW9 For pilot cancellation testing When pilot cancellation is used When pilot cancellation is not used SW10 Mute off (pin 33) MUTE OFF MUTE ON |
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