SM8707 Datasheet, PDF (16/20 Pages) Nippon Precision Circuits Inc – Clock Generator with Dual PLLs

SM8707 series
SM8707F
The SM8707F sampling frequency fs can be switched between 44.1kHz when FSEL (pin 14) is HIGH, and
48kHz when FSEL is LOW. The audio outputs (AO1 and AO2) are equivalent to 768fs, where fs is determined
by the setting on FSEL. In addition, the signal processor outputs (SO1 and SO2) are 16.9344MHz and
33.8688MHz clocks, respectively, derived from the master clock. The video output (MO1) is a 27MHz clock,
identical to the master clock.
The SM8707F supported clock frequencies are shown in Table 3.
Table 3. 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)
Output clock frequency [MHz]
AO2 (Pin 10) SO1 (Pin 13) SO2 (Pin 15)
33.8688
(768fs)
16.9344
33.8688
36.8640
(768fs)
16.9344
33.8688
MO1 (Pin 3)
27.0000
27.0000
SM8707G
The SM8707G signal processor outputs (SO1, SO2 and SO3) are all 33.8688MHz clocks, derived from the
master clock. The video output (MO1) is a 27MHz clock, identical to the master clock.
The SM8707G supported clock frequencies are shown in Table 4.
Table 4. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
SO1 (Pin 9)
33.8688
Output clock frequency [MHz]
SO2 (Pin 10) SO3 (Pin 13)
33.8688
33.8688
MO1 (Pin 3)
27.0000
SM8707H
The SM8707H 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 512fs, where fs is determined by the set-
ting on FSEL. In addition, the signal processor outputs (SO1, SO2 and SO3) are 36.8640MHz, 16.9344MHz
and 33.8688MHz clocks, respectively, derived from the master clock. The video outputs (MO1 and MO2) are
27MHz clocks, identical to the master clock.
The SM8707H supported clock frequencies are shown in Table 5.
Table 5. 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)
22.5792
(512fs)
24.5760
(512fs)
SO1 (Pin 9)
36.8640
36.8640
Output clock frequency [MHz]
SO2 (Pin 13) SO3 (Pin 15)
16.9344
33.8688
16.9344
33.8688
MO1 (Pin 3)
27.0000
27.0000
MO2 (Pin 4)
27.0000
27.0000
NIPPON PRECISION CIRCUITS INC.—16