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SM8706 Arkusz danych(PDF) 6 Page - Nippon Precision Circuits Inc

Numer części SM8706
Szczegółowy opis  Clock Generator for DVD Players
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Producent  NPC [Nippon Precision Circuits Inc]
Strona internetowa  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8706 Arkusz danych(HTML) 6 Page - Nippon Precision Circuits Inc

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SM8706A
NIPPON PRECISION CIRCUITS—6
Sampling Frequency and Output Clock Frequency
The SM8706A sampling frequency fs can be switched between 44.1kHz when FSEL (pin 14) is LOW, and
48kHz when FSEL is HIGH. The audio outputs (AO1 and AO2) are a 384fs and 768fs frequency clock, respec-
tively, where fs is determined by the setting on FSEL. In addition, the signal processor outputs (SO1 and SO2)
are a 16.9344MHz and 33.8688MHz frequency clock, respectively, derived from the master clock. The video
outputs (MO1 and MO2) are a 27MHz and 54MHz frequency clock, respectively, derived from the master
clock.
When CE (Pin16) is HIGH, the chip is enabled. When LOW, the chip is disabled. When disabled, all output go
LOW and all internal circuits stop operating. When CE goes LOW to HIGH, the chip moves from disabled to
enabled, the time taken until the output frequency clocks stabilize is a maximum of 5ms.
The SM8706A output clock frequencies that can be selected is shown in Table 1. The output clock response
timing relative to the CE setting is shown in Figure 5.
Table 1. Sampling frequency and output clock frequency (36.8640MHz master clock frequency)
FSEL
(Pin 14)
Sampling
frequency
fs [kHz]
CE
(Pin 16)
Output clock frequency [MHz]
AO1
(Pin 9)
AO2
(Pin 10)
SO1
(Pin 13)
SO2
(Pin 15)
MO1
(Pin 3)
MO2
(Pin 4)
LOW
44.1
H
16.9344
33.8688
16.9344
33.8688
27.0000
54.0000
HIGH
48
18.4320
36.8640
16.9344
33.8688
27.0000
54.0000
LOW
44.1
LLLLLLL
HIGH
48
Figure 5. CE switching response
5ms
(max)
SO1/SO2
MO1/MO2
AO1/AO2
CE


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