SM8701BM Datasheet, PDF (9/14 Pages) Nippon Precision Circuits Inc – DVD Player Clock Generator

SM8701BM
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.
Table 1. Sampling frequency and output clock frequency
Sampling rate
Standard
Double
Sampling
frequency fs
32 kHz
44.1 kHz
48 kHz
64 kHz
88.2 kHz
96 kHz
SO1
33.8688
33.8688
33.8688
33.8688
33.8688
33.8688
Output clock frequency (MHz)
SO2
SO3
8.192
12.288
11.2896
16.9344
12.288
18.432
16.384
24.576
22.5792
33.8688
24.576
36.864
SO4
24.576
33.8688
36.864
24.576
33.8688
36.864
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.
RSTN
Internal Reset
Master Clock
Reset
1
23
1024
1024 Master Clock
Figure 3. External reset timing
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