Semiconductor
MSM5218
3
Semiconductor
MSM5218
ADPCM Voice Analysis/Synthesis IC
GENERAL DESCRIPTION
The MSM5218 is a complete voice analysis/synthesis IC featuring the Adaptive Differential Pulse
Code Modulation (ADPCM) method of data compression. The MSM5218 contains an analysis stage
where serial PCM data is compressed to 3- or 4-bit parallel ADPCM data. In addition, a synthesis
stage synthesizes PCM data from ADPCM data.
FEATURES
ADPCM data compatible with OKI's synthesis IC MSM5205
Analysis/synthesis switching pin provided
Lower power consumption achieved by one-chip CMOS IC
Built-in 10-bit D/A converter for analog output
Variable sampling frequency (4 kHz, 6 kHz, 8 kHz)
Master clock frequency: 384 kHz
Package: 24-pin plastic DIP (DIP24-P-600) (Product name: MSM5218RS)
BLOCK DIAGRAM
BIN/TOC
SICK
ADSI
SCON
XT
XT
S
1
S
2
VCK
RESET
4B/3B
ANA/SYN
D
3
D
2
D
1
D
0
DAOUT
MSB/SO
SOCK
12-bit
SR
f
SI
12
OSC
Timing
Circuit
V
DD
ADPCM
Analyzer
ADPCM
Synthesizer
10
12
10-bit
DAC
12-bit
SR
DAS
V
SS
T
1
T
2
Semiconductor
MSM5218
3
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Condition
Rating
Unit
Power Supply Voltage
V
DD
Ta = 25C
3.0 to +7.0
V
Input Voltage
V
IN
Ta = 25C
3.0 to V
DD
V
Power Dissipation
P
D
Ta = 25C
200 max
mW
Storage Temperature
T
STG
--
55 ~ +150
C
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Condition
Range
Unit
Power Supply Voltage
V
DD
--
+3 to +6
V
Operating Temperature
T
OP
--
30 to +70
C
Oscillator Frequency
f
OSC
Specified Oscillator
386 to 768
kHz
ELECTRICAL CHARACTERISTICS
DC Characteristics
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Input High Voltage
V
IH
All inputs except
XT, T
1
, T
2
4.2
--
--
V
Input Low Voltage
V
IL
All inputs except
XT, T
1
, T
2
--
--
0.8
V
Input High Current (1)
I
IH
V
IN
= V
DD
--
--
1
mA
Input Low Current
I
IL
V
IN
= 0V
--
--
1
mA
Output High Current
I
OH
SCON, VCK, SOCK,
MSB/SO, D0 to D3
V
0
= 4.2V
50
--
--
mA
Output Low Current
I
OL
SCON, VCK, SOCK,
MSB/SO, D0 to D3
V
0
= 0.4V
50
--
--
mA
Operating Current
I
DD
f
VCK
= 8kHz
--
3
6
mA
DA. OUT Output Impedance
V
OR
--
--
100
--
k
W
D/A Accuracy
(Internal 10-bit D/A)
V
E
Full Scale
V
DD
= +5V
--
--
LSB
SICK Clock Frequency
f
(SICK)
--
--
--
500
kHz
Input High Current (2)
I
IH2
V
IN
= V
DD
(Note 1)
20
--
400
mA
(V
DD
= 5V5%, Ta = 30C to +70C, Ta =25C typically)
4
Note 1:
Applicable for Reset.
Semiconductor
MSM5218
3
APPLICATION CIRCUITS
Example where a 12-bit AD Converter is Connected
LPF
or
S&H
12-bit
ADC
SICK
ADSI
SCON
MSM5218
DAOUT
RESET
VCK
Controller
XT
XT
D3
D2
D1
D0
LPF
RAM
384kHz [ "Ceralock" made by Murata MFG. Co., Ltd.]
+
ex
HA2435
by HARRIS
Co.
ex
ADC-80AG
by MN
Co.
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