The ML2240 is a 4-channel mixing speech synthesizer LSI which allows direct connection of external mask ROMs, EPROMs, etc., up to 128 Mbits for storing speech data. The playback methods can be selected from 8-/16-bit PCM, 8-bit non-linear PCM, and 2-/4-bit ADPCM2. It also features 2-channel stereo output and volume adjustment. This LSI is provided with a 14-bit D/A converter and a low-pass filter. A speech synthesizer device can easily be configured by externally connecting the CPU to this LSI.

Data Sheet (outline) [PDF]

Main Features and Specifications

• 8-bit/16-bit PCM, 8-bit non-linear PCM, 2-bit/4-bit ADPCM2
• Serial input/parallel input selectable
• Edit ROM function
• 4-channel mixing function
• Sampling frequency: 4.0 kHz, 5.3 kHz, 6.4 kHz, 8.0 kHz, 10.6 kHz, 12.8 kHz, 16.0 kHz, 21.3 kHz, 25.6 kHz, 32.0 kHz, 42.7 kHz, 48 kHz
• Maximum number of phrases: 256 phrases
• Built-in volume adjusting function
• Built-in 14-bit D/A converter
• Built-in lowpass filter: Digital filter
• Package: 80-pin plastic TQFP
• Supply voltage: 2.7 to 3.6V (3 V version), 4.5 to 5.5 V (5 V version)
• Operating temperature: --40 to +85°C
• Source oscillation frequency: 4.096 MHz (standard)

Block Diagram

Example of Application

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