ml2216 Oki Semiconductor, ml2216 Datasheet - Page 23

• Manufacturer Part Number: ml2216
• Description: Oki Adpcm2 Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

Power Down Function
In power down state, the power down function in the device stops the internal operation and oscillation, and
minimizes the static Idd.
When an external clock is in use, input “L” level to the XT pin, so that current does not flow into the oscillation
circuit.
Figure below shows the equivalent circuit of XT and XT pins.
Initial state at the time of reset input and power down state
Each output pin state is shown.
Voice Synthesis Algorithm
The ML2250 family contains 5 algorithm types to match the characteristic of playback voice: 4-bit ADPCM 2
algorithm, 8-bit PCM algorithm, 8-bit non-linear PCM algorithm, and 16-bit PCM algorithm.
Key feature of each algorithm is described in the table below.
OKI Semiconductor
Oki 4-bit ADPCM2
Oki 8-bit Nonlinear PCM
8-bit PCM
16-bit PCM
Voice synthesis algorithm
Power down signal
(Set the signal at a “L” level
when powered down.)
Digital output pin
BUSY
NCR
RAO
Normal voice waveform
High-frequency
inclusive sound effect etc.
High-frequency
inclusive sound effect etc.
High-frequency
inclusive sound effect etc.
“H” level
“H” level
“L” level
state
Applied waveform
XT
1 M Ω approx.
components
components
components
Analog output pin
XT
REGO
AOUT
SPM
VBG
SPP
SG
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.
Normal 8-bit PCM algorithm
Normal 16-bit PCM algorithm
To master clock inside the device
Feature
SPGND level
SPGND level
DGND level
AGND level
AGND level
AGND level
state
ML2216/ML22P16
FEDL2216FULL-03
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