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NJU26167 Datasheet(PDF) 6 Page - New Japan Radio

Part # NJU26167
Description  NJU26100 Series Hardware Specification
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.jrc.co.jp/eng/index.html
Logo NJRC - New Japan Radio

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NJU26100 Series
- 6 -
Ver.2005-02-24
3. Audio Clock
Audio data samples must be transferred in synchronism between all components of the digital audio system.
That is, for each audio sample originated by an audio source there must be one and only one audio sample
processed by the NJU26100 Series and delivered to the D/A converters. To accomplish this, one device in the
system is selected to generate the audio sample rate; the remaining devices are designated to follow this sample
rate. The device that generates the audio sample rate is called the MASTER device; all devices following this
sample rate are called SLAVE(s).
LR, BCK and MCK should be synchronized. This is described in next section. When the NJU26100 Series is in
MASTER mode, the NJU26100 Series system clock should be 768 multiples of the sampling frequency (Table3-1).
When the NJU26100 Series is in SLAVE mode, NJU26100 Series system clock should be from 768 multiples of
the sampling frequency up to the maximum operating frequency.
3.1 System Clock
Three types of clock signals are included in the serial audio interface. Two of the clock signals LR (LRI and LRO)
and BCK (BCKI and BCKO) establish data transfer on the serial data lines. The third clock, MCK, is not associated
with serial data transfer but is required by delta-sigma A/D and D/A converters.
The frequency of the LR clock is, by definition, equal to the digital audio sample rate, Fs. BCK and MCK operate
at multiples of the LR clock rate. Therefore the signals LR, BCK and MCK must be locked, that is, they must be
generated or derived from a single frequency reference. In SLAVE mode, the NJU26100 Series dose not generate
MCK clock.
Table 3-1 Sampling Frequency and BCK, MCK, XI
Clock Signal
Multiple Frequency
32kHz
44.1kHz
48kHz
LR
1Fs
32kHz
44.1kHz
48kHz
BCK(32Fs)
32Fs
1.024MHz
1.4112MHz
1.536MHz
BCK(64Fs)
64Fs
2.048MHz
2.822MHz
3.072MHz
MCK(256Fs)
256Fs
8.192MHz
11.289MHz
12.288MHz
MCK(384Fs)
384Fs
12.288MHz
16.934MHz
18.432MHz
XI
768Fs
24.576MHz
33.8688MHz
36.864MHz
Fig. 3-1 MASTER / SLAVE Mode
SDIx
BCKO
LRO
MCK
BCKI
LRI
SDOx
CLOCK
DIVIDER
Oscillator
MAS TER
SLAVE
XI
XO


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