CF5762AB0

NIPPON PRECISION CIRCUITS INC.—10

NP0014AE

2000.10

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: +81-3-3642-6661

Facsimile: +81-3-3642-6698

http://www.npc.co.jp/

Melody Output Circuit

The melody output circuit employs a BTL configura-

tion.

The D/A converter is a 2-pin (SP and SPN) 9-bit P-

channel current adder which, together with MSB and

MSBN outputs, is used to drive 4 external transistors

(PNP

× 2, NPN × 2) which are used to drive a

speaker.

In addition, the volume adjust pin (VOL) can be used

to adjust the volume by connecting an external 10k

Ω

resistor between VOL and VSS.

Control Signal Output

A LOW-level active busy signal is output from ATN whenever a melody output is playing.

Figure 6. BTL output

MSB

MSBN

SPN

SP

VSS

VDD

VDD

VSS

VOL