OKI MSM6585 Technical data

E2D0011-27-43

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¡ Semiconductor

¡ Semiconductor

This version: Jan. 1998

Previous version: May. 1997

MSM6585

MSM6585

ADPCM Voice Synthesis IC

GENERAL DESCRIPTION

The MSM6585 is an version-up product of the MSM5205 voice synthesis IC. Mainly improved points
are improvement for the precision of an internal DA converter, a built-in low-pass filter, and
expansion on the sampling frequency. The MSM6585 does not include a control circuit to drive an
external memory similar to the MSM5205. Therefore, the MSM6585 can be connected with not only
semiconductor memories, but other memory media (CD-ROM, etc.) by the control of CPU.

FEATURES

• 4-bit ADPCM method

• Built-in 12-bit DA converter

• Built-in low-pass filter (LPF) (–40dB/oct)

• Sampling frequencies: 4k/8k/16k/32kHz

• Master clock frequency (ceramic oscillator) : 640kHz

• Voice data synthesis : Supported by voice analysis editing tools AR76-202 and AR203

• Package options :
18-pin plastic DIP (DIP18-P-300-2.54) (Product name : MSM6585RS)
24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM6585 GS-K)
30-pin plastic SSOP (SSOP30-P-56-0.65-K) (Product name : MSM6585 GS-AK)

DIFFERENCES BETWEEN MSM6585 AND MSM5205

MSM6585 MSM5205

• Master clock frequency: 640kHz 384kHz

• Sampling frequency: 4k/8k/16k/32kHz 4k/6k/8kHz

• ADPCM bit length: 4-bit 3-bit/4-bit

• DA Converter: 12-bit 10-bit

• Low-pass filter: Included (–40dB/oct) Not included

• Overflow preventing circuit: Included Not included

• Power supply voltage: 4.5 to 5.5V 3.0 to 6.0V

• Operating current consumption: 10mA 4mA

• Operating temperature: –40 to +85°C –30 to +70°C

• D3 to D0 input timing

VCK (O)

D3 - D0

input timing

ADPCM Data

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BLOCK DIAGRAM

MSM6585

GND

V

DD

D3
D2
D1
D0

4124-Bit

LATCH

12-Bit DAC LPF

OSC Timing Controller TEST CIRCUIT

XT XT S1 S2 RESET VCK T1 T2 T3 T4

ADPCM

Synthesizer

–
+

AOUT

DAO

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PIN CONFIGURATION (TOP VIEW)

MSM6585

S1

1

S2

2

T3

3

D0

4

D1

5

D2

6

D3

7

T4

8

GND

9

18-Pin Plastic DIP

18

17

16

15

14

13

12

11

10

S1

S2

NC

NC

NC

T3

D0

D1

D2

D3
NC

NC

NC

T4

GND

V

DD

XT

XT

RESET

VCK

T2

T1

DAO

AOUT

1

2

3

4

5

6

7

8

9

10
11

12

13
14

15

S1

S2

T3

NC

D0

NC

D1

D2

NC

D3

T4

GND

1

2

3

4

5

6

7

8

9

10
11

12

NC : No connection

24-Pin Plastic SOP

30

V

DD

XT

29

NC

28

NC

27

NC

26

XT

25

RESET

24

VCK

23

T2

22

T1

21

NC

20

NC

19

NC

18

DAO

17

AOUT

16

24

23

22

21

20

19

18

17

16

15
14

13

V

DD

XT

XT

NC

RESET

NC

VCK

T2

T1

NC
DAO

AOUT

NC : No connection

30-Pin Plastic SSOP

3/14

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PIN DESCRIPTION

MSM6585

Pin

DIP SOP

SSOP

111

336

5, 7,

4-7

8, 10

7-10

81114

91215

10 13 16

11 14 17

12 16 21

14 18 23

15 20 24

16 22 25

17 23 29

18 24 30

Symbol Type Description

S1

S2222

T3 I

D0-D3 I

T4 O

GND —

Pins to determine the sampling frequency.

The sampling frequencies of 32k, 16k, 8k, and 4kHz can be selected by

I

combinations. (See the sampling frequencies in FUNCTIONAL

DESCRIPTION on the selection of combinations.)

Pin to test the internal circuit. Set this pin to a high level or make it open

because it has a built-in pull-up resistor.

Input pins for ADPCM data.

Pin to test the internal circuit. Make this pin open.

Pin to test the internal circuit. Make this pin open.

Ground pin

Pin to output the analog voice from the low-pass filter. Connect a 0.01 mF

AOUT O

capacitor to this pin. (See the AOUT connecting circuit in FUNCTIONAL

DESCRIPTION on the connecting circuit.)

DAO O

T1

T213 17 22

Pin to output the analog voice from the DA converter.

Pins to test the internal circuit. Set these pins to a low level or make them

I

open because pull-down resistors are included.

This pin outputs the sampling frequency selected by the combinations of

VCK O

S1 and S2.
The voice synthesis starts or stops by synchronizing with VCK.

Reset pin. The voice synthesis circuit is initialized by synchronizing with

RESET I

VCK. If this pin is set to a high level, the D0 to D3 data inputs are disabled
by synchronizing with VCK. The AOUT and DA0 pins output 1/2 V

become the state of no voice.

XT I

XT O

V

DD

Pin to connect an oscillator. When the external clock is used, input it

from this pin.

Pin to connect an oscillator.

When the external clock is used, make this pin open.

Power supply pin. Insert a bypass capacitor of 0.1 mF or more between

—

this pin and the GND pin.

DD

and

4/14

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ABSOLUTE MAXIMUM RATINGS

Parameter

Power Supply Voltage

Input Voltage

Storage Temperature

Symbol

V

DD

V

IN

T

STG

Condition

Ta = 25°C

Ta = 25°C

—

Rating

–0.3 to +7.0

–0.3 to V

–55 to +150

DD

+0.3

MSM6585

(GND=0 V)

Unit

V

V

°C

RECOMMENDED OPERATING CONDITIONS

Parameter

Power Supply Voltage

Operating Temperature

Master Clock Frequency

DD

op

OSC

Condition Range UnitSymbol

— 4.5 to 5.5 VV

— –40 to +85 °CT

oscillator connection 640 kHzf

ELECTRICAL CHARACTERISTICS

DC Characteristics

Parameter

"H" Input Voltage

"L" Input Voltage

"H" Output Voltage

"L" Output Voltage

"H" Input Current

"H" Input Current

"H" Input Current

"L" Input Current

"L" Input Current

"L" Input Current

Current Consumption

DA Output Relative Error

DA Output Impedance

LPF Load Resistance

Symbol

V

IH

V

IL

V

OH

V

OL

I

IH1

I

IH2

I

IH3

I

IL1

I

IL2

I

IL3

I

DD

| V

DAE

R

DAO

R

AOUT

S1, S2, D0 - D3, T3: V

|

Condition Unit

—

—

VCK: I

OH

= –40mA

VCK: IOL = 40mA

T1, T2, RESET: V

XT: VIH = V

IH

DD

T3: VIL = 0V

S1, S2, D0 - D3, T1, T2,

IL

=0V

IL

=0V

RESET: V

XT=V

f

=640kHz, No load

osc

No load

—

—

(VDD=4.5 to 5.5V, GND=0V, Ta=–40 to +85°C)

= V

IH

DD

= V

DD

Min.

0.8¥V

–0.1

V

DD

—

20

—

—

–400

–10

–20

—

—

10

50

–0.4

DD

Typ.

—

—

—

—

150

—

—

–120

—

—

5

—

—

—

Max.

V

0.2¥V

(GND = 0V)

+0.1

DD

DD

—

0.4

400

10

20

–20

—

—

10

40

40

—

V

V

V

V

mA

mA

mA

mA

mA

mA

mA

mV

kW

kW

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