MSM9831 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9831

VOICE SYNTHESIS LSI with on-chip 384Kbit MASK ROM

Oki Electric Industry 

¡ Semiconductor

MSM9831-xxx

Connecting the MSM9831 to Speaker Driving Amplifier

The MSM9831 uses a current output type D/A converter.

When the MSM9831 is connected to a voltage input type amplifier, it is required to convert the

voice signal that is output as "change of current" into the voice signal that is output as "change

of voltage".

The connection between the MSM9831 and MSC1157 (OKI speaker driving amplifier) when a

resistor is used for the above conversion is described below.

Circuit connection example 1: When VDD=5.0V and the amplitude of Ain of the MSC1157

is 2.5VP-P

+5V

+5V

+

–

VDD

47nF

VCC

P1.2

ST

AOUT

+

Ain

SP

P1.1

PI

P1.0

PDWN

SP

–

XT

4.096MHz

XT

GND

STBY

VR

+

–

SEL GND

(Ceramic oscillation is selected)

Circuit connection example 2: When VDD=3.0V and the amplitude of Ain of the MSC1157

is 1.5VP-P

+3V

+3V

+

–

VDD

47nF

VCC

P1.2

ST

AOUT

+

Ain

SP

P1.1

PI

P1.0

PDWN

SP

–

CLK

XT

XT

GND

STBY

VR

+

–

SEL GND

(External clock input is selected)

18/22

Share Link: