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ML22Q374 / ML22Q394

Speech synthesis LSI with built-in small-capacity Flash ROM



ML22Q374/Q394 are voice sound playback LSI ideal for the message playback about 10 to 20 seconds with small size and low current consumption.
Flash ROM for a voice record, oscillator, D class speaker amp. required for a voice sound playback are integrated, and they reduce external parts and package size.
Moreover, since D class speaker amp. is built in, they are most suitable for long battery operated products.
Sound data can be easily created by utility software "Speech LSI Utility".And customers can store the created sound data in a sample LSI using LAPIS Semiconductor's development tool.



Playback Time

Playback methods Fs=8kHz Fs=12.8kHz Fs=16kHz Fs=25.6kHz Fs=32kHz
16bitPCM 5.4 3.3 2.7 1.6 1.3
ADPCM2 21.6 13.5 10.8 6.7 5.4




Parameter Specification
Part No. ML22Q374
Speech synthesis method 4bit ADPCM2,
8bit non-linear PCM
8/16bit straight PCM
(Can be set method for each phrase)
Speech ROM capacity 692Kbit Flash
Sampling frequency
at Fosc=4.096MHz
Analog output Class D speaker amplifier
Interface three-wire serial clock synchronization I2C
Max. No. of phrases 30Phrases
Disconnection detection Yes
Short detection Yes
Operating frequency 4.096MHz ( Typ ) internal
Operating voltage +2.0V to +5.5V
Flash memory rewrite times 80 times
Operating temperature -40°C to +85°C
Supply form 16pin plastic SSOP

*HQ-ADPCM is a high sound quality audio compression technology of "Ky's".
"Ky's" is a registered trademark of National University Corporate Kyushu Institute of Technology.