SM8707 Datasheet, PDF (15/20 Pages) Nippon Precision Circuits Inc – Clock Generator with Dual PLLs

SM8707 series
Sampling Frequency and Output Clock Frequency
SM8707D
The SM8707D 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 a 384fs frequency clock when FSEL is HIGH (fs =
44.1kHz), and 768fs frequency clock when FSEL is LOW (fs = 48kHz) where fs is determined by the setting
on FSEL. The audio output (AO2) is a 512fs frequency clock. In addition, the signal processor output (SO1 and
SO2) is a 16.9344MHz, 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 SM8707D possible output clock frequencies are shown in Table 1.
Table 1. 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)
16.9344
(384fs)
36.8640
(768fs)
AO2 (Pin 10)
22.5792
(512fs)
24.5760
(512fs)
Output clock frequency [MHz]
SO1 (Pin 13) SO2 (Pin 15)
16.9344
33.8688
16.9344
33.8688
MO1 (Pin 3)
27.0000
27.0000
MO2 (Pin 4)
27.0000
27.0000
SM8707E
The SM8707E 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 512fs frequency clock, where fs is deter-
mined by the setting on FSEL. In addition, the signal processor output (SO1 and SO2) is a 33.8688MHz fre-
quency clock derived from the master clock. And the video output (MO1 and MO2) is a 27MHz frequency
clock, identical to the master clock.
The SM8707E possible output clock frequencies are shown in Table 2.
Table 2. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
FSEL
(Pin 14)
HIGH
LOW
Sampling
frequency fs
[kHz]
48
44.1
AO1 (Pin 9)
24.5760
(512fs)
22.5792
(512fs)
AO2 (Pin 10)
24.5760
(512fs)
22.5792
(512fs)
Output clock frequency [MHz]
SO1 (Pin 13) SO2 (Pin 15)
33.8688
33.8688
33.8688
33.8688
MO1 (Pin 3)
27.0000
27.0000
MO2 (Pin 4)
27.0000
27.0000
NIPPON PRECISION CIRCUITS INC.—15