SM1124 datasheet(4/10 Pages) NPC

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SM1124 Series

NIPPON PRECISION CIRCUITS—4

CLK input clock

SC input clock

Serial input

FUNCTIONAL DESCRIPTION

Control Functions

External reference clock

The SM1124 can operate at 12 selectable external

reference clock frequencies. Of these, 8 are

selectable for each tune. When multiple external

clock frequencies are input to a single IC, the clock

must be switched during playback mode. Note that

when the frequency in parentheses is selected, all

tunes can only be played using that single ﬁxed

frequency.

• 32.768 kHz system: 32.768 kHz, 65.536 kHz,

(131.072 kHz)

• 37.5 kHz system: 37.5 kHz, 75.0 kHz,

(150.0 kHz)

• 38.4 kHz system: 38.4 kHz, 76.8 kHz,

(153.6 kHz)

• 48.0 kHz system: 48.0 kHz, 96.0 kHz,

(192.0 kHz)

VIH

VIL

CWH

CWL

CLK

0.5VDD

CLK

VIH

VIL

SWH

SWL

0.5VDD

VIH

VIL

0.5VDD

VIH

VIL

0.5VDD

The external reference clock input is used at any time

as well as during playback mode. If a clock signal is

input when not in playback mode (when ST is

LOW), the gate circuit switches to cutoff the external

reference clock signal from entering the device,

preventing unwanted current ﬂow.

SM1124 Datasheet(PDF) 4 Page - Nippon Precision Circuits Inc

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