¡ Semiconductor

MSC1157

2/13

PIN CONFIGURATION (TOP VIEW)

VR

SP

GND

SEL

STBY

SP

1

2

3

4

8

7

6

5

8-Pin Plastic DIP

or

8-Pin Plastic SOP

PIN DESCRIPTIONS

Symbol Type

Description

—

Power supply pin.

GND

—

Ground pin.

I

Signal input pin for analog signal inputs, etc.

Digital input pins. Setting these pins configures the standby status. See the table below

for how to set the pins.

STBY,

SEL

I

VR

O

SP

O

Speaker output pin. This pin outputs a negative phase with respect to the input signal.

SP

O

Speaker output pin. This pin outputs a positive phase with respect to the input signal.

SEL

STBY

Status

0

Operation

0

1

Standby

Clock

Operation

0

Standby

1

1

Operation

Clock

Operation

Applying a clock between 32kHz and 4MHz to either the STBY or the SEL pin leads the IC

to operation status regardless of the status set at the other pin. Applying clocks to both

of the pins at the same time may cause malfunction.

Refer to the section, RECOMMENDED OPERATING CONDITIONS since clock frequencies

are changed by setting the SEL pin.

0

Operation

Clock

1

Operation

Clock

Unstable Operation

Bias output pin for internal circuits. This pin is at GND potential during standby.

Connecting a capacitor between VR and the GND pin reduces the pop-up noise at power

on and improves the ripple elimination ratio.

Pin

5

4

2

7, 8

1

3

6