OKI Semiconductor
FEDL2250DIGEST-09
Issue Date: Sep. 15, 2005
ML2251/52/53/54/56-XXX,
ML22Q54/Q58
2-Channel Mixing Oki ADPCM Algorithm-Based Speech Synthesis LSI
This document contains minimum specifications. For full specifications, please contact your nearest Oki office or
representative.
GENERAL DESCRIPTION
The ML2250 family is a 2-channel mixing speech synthesis device with an on-chip voice data (i.e., phrases)
storing mask ROM and a flash memory. Besides playing the built-in voice data, this device can output voice data
that is input from outside the device. This ML2250 family allows selecting the playback method from the 8-bit
PCM, non-linear 8-bit PCM, 16-bit PCM, 2-bit ADPCM2, and 4-bit ADPCM2 algorithms. And the sound volume
is adjustable as well.
The ML2250 family incorporates a 14-bit D/A converter and low-pass filter.
It is easy to configure a speech synthesizer by externally connecting a power amplifier and a CPU to the ML2250
family.
The ML2250 family line-up includes 2 types of products: with on-chip mask ROM, and with on-chip flash
memory.
ML2251/52/53/54/56-XXX
This is a CMOS single chip speech synthesis device with an on-chip mask ROM. Products with 5 types of mask
ROMs are available in the ML2250 family depending upon the total playback time length.
ML22Q54/Q58
The ML22Q54/Q58 is a speech synthesis device with a 4-Mbit flash memory built in. The voice data can be
easily written to the flash memory using a special tool. The on-chip flash memory product is suitable for the
diversified low volume production or short delivery time applications that the on-chip mask ROM product
cannot support. The ML22Q54/Q58 is most suitable for evaluation because the circuit configuration is the same
as the on-chip mask ROM product. As it is easy to write to build in-flash memory, it is able to combine fixed
message and variable message.
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FEDL2250DIGEST-09
OKI Semiconductor
ML2250 family
2/36
Table below summarizes the points of difference between the ML2250 family and currently manufactured
products with a ROM built in.
ML2250 family
MSM6650 family
MSM9800 family
ML2210 family
Interface
Parallel or serial
Parallel, serial or
stand-alone
Parallel or
stand-alone
Serial
Playback method
2-bit ADPCM2
4-bit ADPCM2
8-bit PCM
8-bit non-linear PCM
16-bit PCM
4-bit ADPCM
8-bit PCM
8-bit PCM
8-bit non-linear PCM
4-bit ADPCM
8-bit PCM
8-bit non-linear PCM
Max. number of
phrases
256
127
63
247
Sampling frequency
(kHz)
4.0/5.3/6.0/6.4/8.0/10.7
/12.0/12.8/16.0/21.3/
24.0/25.6/32.0/42.7/
48.0
4.0/5.3/6.4/8.0/
10.7/12.8/16.0/
32.0
4.0/5.3/6.4/8.0/10.7/
12.8/16.0
4.0/5.3/6.4/8.0/10.7/
12.8/16.0
Clock frequency
4.096 MHz
256 kHz (CR
oscillation)
4.096 MHz (XT)
256 kHz (CR
oscillation)
4.096 MHz (XT)
4.096 MHz
D/A converter
Voltage type: 14 bits
Voltage type: 12
bits
Current type: 10 bits Current type: 12 bits
Low-pass filter
FIR type interpolation
filter
Secondary comb
filter
Primary comb filter
Secondary comb
filter
Number of channels
2 channels
2 channels
1 channel
1 channel
Phrase control table
Both 2 channels without
user definable phrase
restrictions
Can edit 8
phrases (1
channel only)
Can edit 8 phrases
None
Volume adjustment
29 steps
(
2 dB/
5 dB steps)
4 steps
(
6 dB steps)
Set at VREF.
Set at VREF.
Repeat function
No limit
4 types
None
None
STOP
Each channel
independent
Simultaneous
channels 1 and 2
Available
Available
Seam silence
interval in
continuous playback
0 (Note)
4 sampling cycles 3 sampling cycles
4 sampling cycles
Others
External data input
possible
--
--
--
Note: Continuous playback shown in the figure below is possible.
1 phrase
1 phrase
1 phrase
1 phrase
ML2250 family
Conventional
Silence interval
No silence interval
FEDL2250DIGEST-09
OKI Semiconductor
ML2250 family
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FEATURES
Maximum playback time length (sec) (In 4-bit ADPCM2)
Type
ROM capacity
F
SAM
= 4.0 kHz F
SAM
= 6.4 kHz F
SAM
= 8.0 kHz F
SAM
= 16 kHz F
SAM
= 32 kHz
ML2251
512 Kbit
31.7
19.8
15.8
7.9
3.9
ML2252
1 Mbit
64.5
40.3
32.2
16.1
8.0
ML2253
3 Mbit
195.5
122.2
97.7
48.8
24.4
ML2254
4 Mbit
261.1
163.2
130.5
65.2
32.6
ML22Q54
4 Mbit
261.1
163.2
130.5
65.2
32.6
ML2256
6 Mbit
392.1
245.1
196.0
98.0
49.0
ML22Q58
8 Mbit
522.2
326.4
261.0
130.4
65.2
Non-linear 8-bit PCM, 8-bit PCM, 16-bit PCM, 2-bit ADPCM2, and 4-bit ADPCM2 algorithms
Serial input/parallel input selectable
Phrase control table function i.e., user definable phrase control table function
2 channels mixing function
Master clock frequency:
4.096 MHz
Sampling frequency:
4.0 kHz, 5.3 kHz, 6.0kHz, 6.4 kHz, 8.0 kHz, 10.7 kHz, 12.0kHz,
12.8 kHz, 16.0 kHz, 21.3 kHz, 24.0kHz, 25.6 kHz, 32.0 kHz,
42.7 kHz, 48 kHz
Maximum number of phrases:
256 phrases
Sound volume adjustment function built in (2 sounds independently adjustable in 29 steps)
External voice data can be input
14-bit D/A converter built in
Built-in low-pass filter:
Digital filter
Package:
44-pin plastic QFP (QFP44-P-910-0.80-2K)
(ML2251-XXXGA/ ML2252-XXXGA/ ML2253-XXXGA/
ML2254-XXXGA /ML2256-XXXGA / ML22Q54GA/ML22Q58GA)
33-pin W-CSP
(P-VFLGA33-5.03X5.78-0.80-W)
(ML2253-XXXHB/ ML2254-XXXHB)
(ML2256-XXXHB)
FEDL2250DIGEST-09
OKI Semiconductor
ML2250 family
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BLOCK DIAGRAM
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FEDL2250DIGEST-09
OKI Semiconductor
ML2250 family
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ML22Q54
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