MM1376

MITSUMI IC for Headphone Stereos MM1376 IC for Headphone Stereos Monolithic IC MM1376 Outline This IC was developed for use in 3V headphone stereos, and combines all the basic audio circuitry for headphone stereos on a single chip. Recently hearing impairment caused by the high volumes of headphone stereos has become a problem, and there has been strong demand for functions for limiting loud volumes in the sets themselves. This IC incorporates an ALC circuit and has functions to hold the output from the headphone to a fixed level; it also eliminates the ordinary electronic governor circuit in order to accommodate trends toward thinner sets, as seen in the adoption of BSL motors. Package 1. Configuration: Pre-and power amps, ALC circuit 2. Internal tape selector: A selector switch allows the user to select between normal and metal tapes. 3. Internal OCL circuit: No need for large-capacitance output capacitor 4. Preamp off function: Preamp alone can be turned off for connection to radio etc. 5. MM1376CF amp gain takes Dolby noise reduction into account Package SOP-22 Pin Assignment 1 2 3 4 22 21 20 19 18 17 16 15 14 13 12 5 6 1 2 3 4 5 6 7 8 9 10 11 SOP-22 7 8 9 10 11 COM1 Preamp non-inverted input Preamp inverted input Metal switching output Preamp output Power input Rectifier pin ALC control Power output COM2 GND1 12 13 14 15 16 17 18 19 20 21 22 Power output VCC Ripple filter Preamp off Tape selector Power input Preamp output Metal switching output Preamp inverted inpu...