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SM8701 数据表(PDF) 9 Page - Nippon Precision Circuits Inc |
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SM8701 数据表(HTML) 9 Page - Nippon Precision Circuits Inc |
9 / 14 page 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 24.576 88.2 kHz 33.8688 22.5792 33.8688 33.8688 96 kHz 33.8688 24.576 36.864 36.864 Figure 3. External reset timing 1 2 3 1024 1024 Master Clock Internal Reset Master Clock RSTN Reset |
类似零件编号 - SM8701 |
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类似说明 - SM8701 |
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