The figure of TA7766F low voltage stereo coding integrated circuit

Published:2011/4/22 1:56:00 Author:Crystal Liu | Keyword: low voltage, stereo, coding integrated circuit | From:SeekIC

TA7766F low voltage stereocoding integrated circuit is produced by TOSHIBA.1.The internal circuit figure and the pin functions of TA7766F.The integrated package of TA7766F contains amplifying circuit,stereo\single track switch;The circuit of stereo Decoding ,Voltage controlled oscillator circuit,frequency dividing circuit,direct current amplifier and stereo indicator light controller.The integrated blocks within circuit is shown in figure 1.This lC adopt double row flat 16 feet, the integrated circuit encapsulation structure of pin function and data listed see table 1. 2.TA7766F main electric parameters.TA7766F work power voltage range of integrated circuit for 0.9-2V,typical working voltage is 1.5 V.Its ultimate conditions of use in Ta = 25 ℃, the power supply voltage, allow the Vcc = 2V PD = 35OmW, indicator power drive current I (LAMP)5mA . 3.TA7766F typical application circuit. The typical application of manifold blocks TA7766F circuit shown in figure 2.4.Circuit working process. From TA7766F (2) composite signal input, demodulation of feet after about from (15) channels signal, (16) feet, output, send the latter stage circuit. ⑩ feet external stereo instructions light-emitting diodes that the light emitting diode feet wide by 9 sensitivity resistance can be adjusted. The voltage controlled oscillation in circuit Vco) circuit (by 6 feet external LC resonant circuit can fine-tune Vco frequency.5. Breakdown maintenance tips When couldn't receive FM stereo programs, and can only receive FM mono programs, stereo indicator light point not bright, but check TA7766F (11) feet wide capacitance, because without short-circuit failure feet (11) if because of capacitance, the yi short-circuit grounding. Stop vibration, stereo decoding circuit doesn't work. Then check (13) feet ChanSheng/stereo conversion switch, if switch can't switch to stereo position, (13) foot has high potentials and Vco also stop vibration without stereo. Step 3 check 6 feet of LC network, when capacitance normal, the radio to the stereo position, re-adjusted L, observe whether indicator lights. Stereo sound If it is not bright and check without problems, then, luminous tube TA7766F measured again all the pins voltage and listed in table 1, comparing the normal whether judge this lC failure. Such as voltage, and check deviation is a deviation feet peripheral components are TA7766F communicqtion problem, then explaining damage.



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