FEDL2280XDIGEST-03
OKI Semiconductor
ML22808/ML22804/ML22802-XXX
Power Down Function
This LSI has the power down function. When in a power down state, all the circuits including the oscillator
circuit stop operating, thus minimizing the supply current. When supplying an external clock to the XT pin, tie
the pin at a “L” level during power down.
The figure below shows a equivalent circuit to an oscillator circuit.
Power down signal
(During power down = “L”)
Master clock inside the
LSI
approx. 1 MΩ
XT
XT
The Initial Status at Reset Input and the Status at Power Down of Output Pins
The status of relative output pins at reset input and power down is shown below.
Digital
output pin
Analog
output pin
State
State
NCR
“H” level
“H” level
AOUT
GND level
BUSY
Voice Synthesis Algorithm
The ML22804/ML22808-xxx contain four algorithm types to match the characteristic of playback voice: 4-bit
ADPCM2 algorithm, 8-bit straight ADPCM2 algorithm, 8-bit non-linear PCM algorithm, and 16-bit straight
PCM algorithm.
Key feature of each algorithm is described in the table below.
Voice synthesis
Applied waveform
Feature
algorithm
OKI’s specific speech synthesis algorithm of improved
waveform follow-up with improved 4-bit ADPCM.
Algorithm, which plays back mid-range of waveform as 10-bit
equivalent voice quality.
OKI 4-bit ADPCM2
Normal voice waveform
OKI 8-bit Nonlinear
PCM
High-frequency
components inclusive
sound effect etc.
8-bit PCM
Normal 8-bit PCM algorithm
16-bit PCM
Normal 16-bit PCM algorithm
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