SM8701 Nippon_Precision_Circuits America, SM8701 Datasheet - Page 9

• Manufacturer Part Number: SM8701
• Description: DVD Clock Generator
• Manufacturer: Nippon_Precision_Circuits America

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-
Table 1. Sampling frequency and output clock frequency
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.
Sampling rate
Internal Reset
Master Clock
Standard
D o u ble
RSTN
frequency fs
Sampling
44.1 kHz
88.2 kHz
32 kHz
48 kHz
64 kHz
96 kHz
1
2
Figure 3. External reset timing
33.8688
33.8688
33.8688
33.8688
33.8688
33.8688
3
1024 Master Clock
S O 1
Reset
SM8701BM
trol inputs. SO1 outputs 33.8688 MHz clock. The
supported sampling frequencies and the output clock
frequencies are shown in table 1.
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.
11.2896
22.5792
Output clock frequency (MHz)
12.288
16.384
24.576
8.192
S O 2
1024
NIPPON PRECISION CIRCUITS—9
16.9344
33.8688
12.288
18.432
24.576
36.864
S O 3
33.8688
33.8688
24.576
36.864
24.576
36.864
S O 4