FEDL22620-01 Issue date: Apr 24, 2020 ML22620 4-Channel Mixing Speech Synthesis LSI Overview ML22620 is a 4-channel mixing speech synthesis LSI with a serial flash memory interface for sound data. It is equipped with a clock synchronous serial interface. *1 It adopts a HQ-ADPCM , 16-bit D/A converter, and low-pass filter for high sound quality, and incorporates a 1.0W mono speaker amplifier for driving speakers directly. It is also equipped with a function to detect failure. The functions necessary for sound output are integrated into a single chip, so that sound functions can be realized simply by adding this LSI. *1 Memory capacity and maximum sound production time (HQ-ADPCM algorithm, registered phrase 1024) Product Name Flash memory capacity Maximum sound production time (sec) f =8.0kHz f =16.0kHz f =32.0kHz s s s 128Mbits ML22620 5240 2620 1310 (Serial Flash Memory) Analog Signal FLASH MEMORY Host MCU 16bit Filter MIX Speaker Decode MIX DAC AMP Volume SPI Application Circuit *1 HQ-ADPCM isKy high-quality audio compression technique. Ky is a registered trademark of Kyushu Institute of Technology, a national university corporation. FEDL22620-01 ML22620 Feature Sound data Speech synthesis algorithm: The algorithm can be specified for each phrase. HQ-ADPCM/4bit ADPCM2/8bit non-linear PCM / 8bit Straight PCM/16bit Straight PCM Sampling frequency: The sampling frequency can be specified for each phrase. 10.7/21.3kHz, 6.4/12.8/25.6kHz, 8.0/16.0/32.0kHz, 11.025/22.05/44.1kHz, 12.0/24.0/48.0kHz Maximum number of phrases: 4096 Phrases Edit ROM function Playback function Repeat function: LOOP command Mixing-function: Up to 4-channel Volume adjustment function: CVOL command 128 levels (including off-state) AVOL command 16 levels (including off-state) Low-pass filter 16-bit D/A converter O Speaker amplifier: Class AB/D 1. 0W 8 (SPV =5V, Ta=25 C) DD Line amplifier output: 10k driving (Exclusive operation from speaker amplifier output) External analog sound input (at the time Class AB speaker amplifier choice, with analog mixing function) MCU command interface: Clock Synchronous Serial Interface Failure detection function Speaker short detection: Speaker pin ground fault detection, speaker pin short detection Speaker disconnection detection Thermal detection Clock error detection Flash memory error detection Clock backup function Master clock frequency: 4.096MHz, 4.000MHz Power-supply voltage 2.7V to 5.5V O O *1 Operating temperature range: -40 C to +85 C Package: 32-pin TQFP (7mm x 7mm, 0.8mm pitch) Ordered Part Name: ML22620TB (32-pin TQFP) *1 The operating time of the speaker amplifier may be limited depending on the average ambient temperature (Ta) used. 2/115