mtk9269 is a voice chip with stable and reliable performance
The voice chip converts the voice signal into a number through sampling, stores it in the ROM of the IC, and then restores the numbers in the ROM into a voice signal through the circuit. According to the output mode of the voice chip is divided into two categories, one is PWM output mode, the other is DAC output mode, PWM output volume is not continuous adjustable, can not be connected to the ordinary power amplifier, most of the voice chip on the market is PWM output mode. The other is the DAC amplified by the internal EQ, the voice chip sound is continuously adjustable, can be adjusted by digital control, and can be connected to an external power amplifier. Its main parameters are the voltage output range is 1.1V-1.85V, the switching frequency is 80KHz. The input voltage range is 2.7V ~ 5.5V, the main frequency rate is 3600, and the output voltage is 36 volts.