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ML2282x/ML2286x series

4M/8M/16M bit 2 channel mixing speech synthesis LSI with large scale P2ROM™



package dimension figure


ML2282 /ML2286  series is a high-quality speech synthesis LSI with built-in large-capacity P2ROM™. The LSI, which includes an ADPCM2 decoder, 16-bit DAC, a low-pass filter, and a monaural speaker amplifier, incorporates the peripheral components necessary for speech output in a single chip. The LSI is provided with a variety of functions including 2-channel simultaneous playback, edited palyback, and bank switching.
By using P2ROM in the memory section, the trun-around time from order receiving to mass-production and shipment is reduced significantly and the mask cost is no longer necessary.
16M, 8M, and 4M, are made available in the lineup for each of the P2ROM version.

Playback Time

(at 4bit ADPCM2 method)
Part number Memory type ROM
Maximum playback time(s)
fs=4.0k fs=8.0k fs=16.0k
ML22825 / ML22865 P2ROM 16M 1044 522 261
ML22824 / ML22864 8M 520 260 130
ML22823 / ML22863 4M 258 129 64


  • 2-channel mixing function enabling simultaneous playback
  • Long-time playback of 1044 seconds in maximum
    Large memory size to handle the increase of incorporation of speech data and high quality speech
  • Built-in amplifier
  • Memory bank function
    The built-in memory can be divided, enabling a new way of using speech LSI such as increase of the number of playback phrases.
  • The use of P2ROM allows TAT to be significantly reduced.
  • Supports the development by evaluation board and special writer.
  • 3 products (with the capacities of 4M, 8M, and 16M bits) lined up
  • CPU IF: SPI(ML2282x),I2C(ML2286x)


  • Household electrical appliances
  • Voice guidance of industrial equipment
  • Voice information of fees and time
  • IH cooking heater
  • Compact portable devices
  • General consumer equipment, and so on


Parameter Specification
Part number ML2282x/ML2286x series
Speech synthesis method 4bit ADPCM2
8bit non-linear PCM
8bit PCM, 16bit PCM
(can be specified for each phrase)
Sampling frequency
4.0k, 5.3k, 6.4k, 8.0k, 10.7k, 12.0k, 12.8k ,
16.0k ,21.3k ,24.0k, 25.6k ,32.0k, 48.0kHz
(Each phrase can be specified.)
Speaker amplifier output 0.7W(8&Omega, 5V)
Playback phrase count Up to 4,096 phrases(ML22825)
Other functions Volume control function, Repeat function, ROM edit function
Operating power supply voltage +2.7V to +5.5V
Clock frequency 4.096MHz
Operating temperature range -40°C to +85°C
Package 30pin plastic SSOP
(2-direction lead type, 0.65mm lead pitch)

Block Diagram

ML2282x series block diagram

Block diagram

Typical Application Example

ML2282 series

Typical application example