SM8707 Datasheet, PDF (17/20 Pages) Nippon Precision Circuits Inc – Clock Generator with Dual PLLs

SM8707 series
SM8707K
The SM8707K sampling frequency fs can be switched between 44.1kHz when FSEL (pin 14) is HIGH, and
48kHz when FSEL is LOW. The audio output (AO1) is equivalent to 768fs, where fs is determined by the set-
ting on FSEL. In addition, the signal processor output (SO1, SO2, SO3 and SO4) is 24.5760MHz,
18.4320MHz, 36.8640MHz and 33.8688MHz clocks, respectively, derived from the master clock. Also, the
audio output AO1 36.8688MHz clock is synchronized with the signal processor output SO4 clock, and audio
output AO1 36.8640MHz clock is synchronized with the signal processor output SO3 clock.
The SM8707K supported clock frequencies are shown in Table 6.
Table 6. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
FSEL
(Pin 14)
HIGH
LOW
Sampling
frequency fs
[kHz]
44.1
48
AO1 (Pin 10)
33.8688
(768fs)
36.8640
(768fs)
Output clock frequency [MHz]
SO1 (Pin 4) SO2 (Pin 9) SO3 (Pin 13)
SO4 (Pin 15)
24.5760
18.4320
36.8640
33.8688
24.5760
18.4320
36.8640
33.8688
SM8707L
The SM8707L sampling frequency fs can be switched between 44.1kHz when FSEL (pin 14) is LOW, and
48kHz when FSEL is HIGH. The audio output (AO1 and AO2) is a 768fs frequency clock, where fs is deter-
mined by the setting on FSEL. In addition, the signal processor output (SO1 and SO2) is 24.5760MHz and
33.8688MHz frequency clock derived from the master clock. And the video output (MO1 and MO2) is a
27MHz frequency clock, identical to the master clock.
The SM8707L supported clock frequencies are shown in Table 7.
Table 7. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
FSEL
(Pin 14)
HIGH
LOW
Sampling
frequency fs
[kHz]
44.1
48
AO1 (Pin 9)
33.8688
(768fs)
36.8640
(768fs)
AO2 (Pin 10)
33.8688
(768fs)
36.8640
(768fs)
Output clock frequency [MHz]
SO1 (Pin 13) SO2 (Pin 15)
24.5760
33.8688
24.5760
33.8688
MO1 (Pin 3)
27.0000
27.0000
MO2 (Pin 4)
27.0000
27.0000
NIPPON PRECISION CIRCUITS INC.—17