SM1124 Series

NIPPON PRECISION CIRCUITS—10

NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to

improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for

the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits

are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision

Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.

The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or

malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,

including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or

indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.

NIPPON PRECISION CIRCUITS INC.

4-3, Fukuzumi 2-chome

Koto-ku, Tokyo 135-8430, Japan

Telephone: 03-3642-6661

Facsimile: 03-3642-6698

NC9503AE

1996.01

NIPPON PRECISION CIRCUITS INC.

TYPICAL APPLICATION

Speaker drive with switching circuit

For example

Q1: hfe 100 MIN

SP: Impedance 16

Ω MIN

R1: 1.2k

Ω

R2, R3: to be decided by sound volume

Speaker drive with Linear amplifier

For example

VR1: 10k

Ω MIN

(As the output impedance of MTO terminal

is up to 1k

Ω MAX, the value above is given

under the condition that output shall be over

90% of supply voltage amplitude. If it is set

below 10k

Ω, output amplitude becomes

smaller.)

C1: to be decided by Input impedance of

amplifier.

C2, SP: to be decided by Output impedance

of amplifier.

CPU

VDD

CLK

SI

SC

ST

VDD

VSS

MTO

TEST

VSS

SM1124

DC-DC

Converter

R1

R2

R3

Q1

1.5V

2.4 to 3.6V

SW1

SP

CPU

VDD

CLK

SI

SC

ST

VDD

VSS

MTO

TEST

VSS

SM1124

DC-DC

Converter

VR1

1.5V

2.4 to 3.6V

IN OUT

VCC

GND

SP

C2

C1

+