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SM8701BM

NIPPON PRECISION CIRCUITS—9

Sampling Frequency and Output Clock Frequency

The SM8701BM generates several output clocks

from the 27 MHz master clock, with frequencies of

256fs (SO2), 384fs (SO3) and 768fs (SO4), where fs

is the sampling frequency selected by external con-

trol inputs. SO1 outputs 33.8688 MHz clock. The

supported sampling frequencies and the output clock

frequencies are shown in table 1.

Reset

The SM8701BM supports an external reset using

RSTN (pin 18). At reset, the mode register takes its

default value, and the output clocks have default fre-

quencies.

When RSTN goes HIGH, an internal reset continues

for a period of 1024 cycles of the 27 MHz master

clock. The timing is shown in ﬁgure 3.

Table 1. Sampling frequency and output clock frequency

Sampling rate

Sampling

frequency fs

Output clock frequency (MHz)

SO1

SO2

SO3

SO4

Standard

32 kHz

33.8688

8.192

12.288

24.576

44.1 kHz

33.8688

11.2896

16.9344

33.8688

48 kHz

33.8688

12.288

18.432

36.864

Doub le

64 kHz

33.8688

16.384

24.576

88.2 kHz

33.8688

22.5792

33.8688

96 kHz

33.8688

24.576

36.864

Figure 3. External reset timing

1024

1024 Master Clock

Internal Reset

Master Clock

RSTN

Reset

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