전자부품 데이터시트 검색엔진 |
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LA1781M 데이터시트(PDF) 5 Page - Sanyo Semicon Device |
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LA1781M 데이터시트(HTML) 5 Page - Sanyo Semicon Device |
5 / 48 page LA1781M No.6038-5/48 Operating Characteristics and Symbols Used in the Test Circuit Diagrams (1) Switches (SW) Switch on = 1, SW off = 0 There are two switches that use signal transfer. 1) SW2 : switches between the mixer input and the IF input. 2) SW4 : switches between noise canceler input and IF output + noise canceler input. (2) 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 83MHz signal. AC3 Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7MHz signal. Stereo modulation must be possible. AC4 Used for AM testing. Outputs 1 MHz and 1.4MHz signals. AC5 Used with the MRC. Can also be used for AF and OSC. (3) Power supply VCC 8V VCC1 5V SD, stereo, seek/stop VCC2 0.1V/0.7V/2V/4V Keyed AGC, Mute ATT VCC3 0.1V/0.6V/2V These levels must be variable. HCC, SNC, SASC (MRC) (4) (a) 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 200k Ω MUTE 200k Ω OFF SW8 MUTE ATT 30k Ω MUTE 30k 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 (b) Trimmers (variable resistors) VR1 Separation adjustment VR2 Pilot cancellation adjustment (5) Test Points (a) 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 (b) AC voltages VA1 AM/FM OSC Buff Pin 4 VA2 First IF output Pin 53 → CF → pin 51 load level (10.7MHz) VA3 IF counter buffer Pin 23 (10.7MHz/450kHz) VA4 MPX OUT Left ch Pin 15 (AF) VA5 MPX OUT Right ch Pin 16 (AF) |
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