SM1124 Datasheet, PDF (10/10 Pages) Nippon Precision Circuits Inc – Multimelody IC for Pagers

SM1124 Series
TYPICAL APPLICATION
Speaker drive with switching circuit
DC-DC
Converter
VDD
CPU
VSS
1.5V
2.4 to 3.6V
SM1124
CLK
VSS
SI
VDD
SC
MTO
ST
TEST
SP
R2
R3
SW1
R1
Q1
For example
Q1: hfe 100 MIN SP: Impedance 16Ω MIN
R1: 1.2kΩ
R2, R3: to be decided by sound volume
Speaker drive with Linear amplifier
DC-DC
Converter
VDD
CPU
VSS
1.5V
2.4 to 3.6V
SM1124
CLK
VSS
SI
VDD
SC
MTO
ST
TEST
VCC
C1
+
IN OUT
GND
C2 _SP
VR1
For example
VR1: 10kΩ MIN
(As the output impedance of MTO terminal
is up to 1kΩ MAX, the value above is given
under the condition that output shall be over
90% of supply voltage amplitude. If it is set
below 10kΩ, output amplitude becomes
smaller.)
C1: to be decided by Input impedance of
amplifier.
C2, SP: to be decided by Output impedance
of amplifier.
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.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome
Koto-ku, Tokyo 135-8430, Japan
Telephone: [phone]
Facsimile: 03-3642-6698
NC9503AE 1996.01
NIPPON PRECISION CIRCUITS—10