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

1/14

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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

2/14

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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

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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

5/14

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AC Characteristics

MSM6585

Parameter

Original Oscillation

Duty Cycle

RESET Input Pulse Width

Data Setup Time

Data Hold Time

f

duty

t

W(RST)

t

S

t

H

f

SAM

= 4kHz
= 8kHz

=16kHz

=32kHz

—

...

t

= 250ms

VCK

...
...
...

= 125ms
= 62.5ms
=31.25ms

Min. Typ. Max.

50 60 %40

2¥t

t

VCK

—

VCK

—

—

—

/2

—

—

UnitSymbol Condition

ms

3

ms

ms

When data is shared with the MSM5205, note that the D3 to D0 selection timings of the MSM6585
and MSM5205 are different. (Refer to DIFFERENCES BETWEEN MSM6585 AND MSM5205.)

TIMING DIAGRAM

VCK (O)

RESET (I)

D3 - D0 (I)

IC internalD3 - D0

selection timings

AOUT, DAO (O)

t

VCK

t

W(RST)

t

H

ADPCM1 ADPCM2 ADPCMN

t

S

t

VCK/8

ADPCM

N+1

The VCK clock rising and falling edges are reversed between the MSM5205 and the MSM6588, as
indicated in DIFFERENCES BETWEEN MSM6585 AND MSM5205.
Note that the MSM6585 cannot accept data if the MSM5205 controls to repeat valid and invalid each
half cycle, when the MSM5205 is replaced with the MSM6585.

6/14

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FUNCTIONAL DESCRIPTION

1. Sampling Frequency

The relationship of the sampling frequencies on S1 and S2, and the cutoff frequencies are
listed below.

MSM6585

S1

S2

L

H

L

H

L

L

H

H

Sampling frequency (f

4 kHz

8 kHz

16 kHz

32 kHz

SAM

)

Cutoff frequency (f

1.6 kHz

3.2 kHz

6.4 kHz

12.8 kHz

CUT

)

2. AOUT Connecting Circuit

Connect a 0.01mF capacitor to the AOUT pin. The circuit diagram is as shown below.

MSM6585

AOUT

0.01mF

Amplifier Speaker

Even when the DAO pin is used, connect a 0.01mF capacitor to the AOUT pin. This capacitor is used
for the improvement of a voice quality.

3. Voice Output

The MSM6585 has two voice output pins. The DAO is direct output pin from the internal DA
converter. The AOUT is a pin to output a voice after which the DAO output passed a built-in LPF.

3.1 DA Converter Output Waveform

The output amplitude from the DA converter is max. (4095/4096) ¥ VDD and becomes a stair step
waveform synchronized with the sampling frequency. The DAO output impedance varies in the
ranges from 10kW to 40kW. Therefore, determine the filter constant so that the resistor variation does
not

have influence on the cutoff frequency of the filter.

7/14

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3.2 Low-pass Filter Output

The cutoff frequency of the low-pass filter varies in proportion to the sampling frequency.
The following figure shows the low-pass filter characteristics in the sampling frequency
8kHz.

0

–20

–40

Damping factor (dB)

–60

MSM6585

4. Oscillation

Following show external circuit diagrams using a ceramic resonator, KBR-640B made by
Kyocera Corp. and CSB640P made by Murata MFG. Co., Ltd.

XT XT

220pF

100 1k 10k

uency (Hz

Fre

KBR-640B used

MSM6585

640kHz

220pF

100pF

CSB640P used

MSM6585

XT XT

1MW

640kHz

100pF

8/14

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APPLICATION CIRCUITS

Centronics Interface Circuit (sampling frequency : 8kHz)

MSM6585

+5V

BUSY

STROBE

RESET

D0

D1

D2

D3

D4

D5

D6

D7

1

6

MSM4013

3

5

8

7

12 9 13

9

7

5

MSM4019

3

1

6

4

2

15

8

0.1mF

0.1mF

144

10

2

11

14

13

12

11

10

16

S1

RESET

VCK

T4

T1

S2

GND
T2

T3 V

MSM6585

ADPCM

DECODER

D2D3

D1

DD

AOUT

DAO

XT

D0

0.1mF

AMP

0.01mF

XT

640kHz

Centronics Timing Chart

RESET

RES

DATA

STROBE

VCK

KA

KB

BUSY

MIN250msec

First byte

125msec

High nibble

Low nibble

9/14

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MSM6585

Example of Interface Circuit with 256K-bit EPROM

The circuit example and timing diagram that used the 256K-bit EPROM are shown below.

A0 ~ A

O0 ~ O11O

MSM4013

RESET

S1Q2D2Q

MSM4013

R1D1S2Q1R

START SW

10kW

0.1mF

100kW

MSM27256

A11A12A13A14O0O4O1O5O2O6O3O

10

11

B1A

12

CL

2

CL

1

CL

2

2

1

KB

D1D2D3D

KA

D0 D1 D2 D3

VCK

MSM6585

RESET

S2 S1

Q

CL

MSM4040

RESET

(MSM4025)

B2A2B3B4A3A

MSM4019

AOUT

Q2Q

1

3

Q

4

CE

7

4

4

640kHz

XT

XT

0.01mF

100kW

M6585 VCK (O)

START SW

M4013 S

1

M4013 Q

M4013 Q

1

2

(M6585 RESET)

(Lower 4-bit)

Q

M4040 Q

M4040 Q

2

1

Q

2

Q

12

3

Q

4

(Upper 4-bit)

10/14

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PAD CONFIGURATION

Pad Layout

Product name MSM6585
Function ADPCM voice synthesis IC
Die size ¥ = 2.92 mm, Y = 3.58 mm

Die thickness 350 µm ±30 µm
Pad size 130 µm ¥ 130 µm

Substrate voltage GND

MSM6585

13

16

17

12

20

Y

8

7

X

3

21

Pad Coordiantes

(The die center is located at X=0, Y=0)

PAD No. PAD Name X-axis Y-axis PAD No. PAD Name X-axis Y-axis

1 S1 377 –1635 11 AOUT 38 1635

2 S2 819 –1635 12 DAO –1125 1635

3 T3 1305 –1635 13 T1 –1305 1579

4 D0 1305 –943 14 T2 –1305 1009
5 D1 1305 44 15 VCK –1305 –88

6 D2 1305 1095 16 RESET –1305 –818

7 D3 1305 1635 17 XT –1281 –1635
8 T4 830 1635 18 XT –529 –1635

9AV

10 V

SS

SS

447 1580 19 V

267 1580 20 AV

DD

DD

–299 –1549

–119 –1549

(Unit: mm)

11/14

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PACKAGE DIMENSIONS

DIP18-P-300-2.54

MSM6585

(Unit : mm)

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
42 alloy
Solder plating
5 mm or more

1.30 TYP.

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SOP24-P-430-1.27-K

Mirror finish

MSM6585

(Unit : mm)

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
42 alloy
Solder plating
5 mm or more

0.58 TYP.

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

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SSOP30-P-56-0.65-K

Mirror finish

MSM6585

(Unit : mm)

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
42 alloy
Solder plating
5 mm or more

0.19 TYP.

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

14/14

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