uda1355h-n2 NXP Semiconductors, uda1355h-n2 Datasheet - Page 11
uda1355h-n2
Manufacturer Part Number
uda1355h-n2
Description
Stereo Audio Codec With Spdif Interface
Manufacturer
NXP Semiconductors
Datasheet
1.UDA1355H-N2.pdf
(76 pages)
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Philips Semiconductors
The readable settings are:
7.3
The UDA1355H has two clock systems.
The first system uses an external crystal of 12.288 MHz to
generate the audio related system clocks. Only a crystal
with a frequency of 12.288 MHz is allowed.
The second system is a PLL which locks on the SPDIF or
incoming digital audio signal (e.g. I
the system clock.
7.3.1
The crystal oscillator and the on-chip PLL and divider
circuit can be used to generate internal and external clock
signals related to standard audio sampling frequencies
(such as 32, 44.1 and 48 kHz including half and double of
these frequencies).
The audio frequencies supported in either microcontroller
mode or static mode are given in Table 3.
2003 Apr 10
Set two times 40 bits of channel status bits of the SPDIF
output
Select one of four SPDIF input sources
Enable digital mixer inside interpolator
Control mute and mixer volumes of digital mixer
Selection of filter mode and settings of treble and bass
boost for the interpolator (DAC) section
Volume settings of interpolator
Selection of soft mute via cosine roll-off (only effective in
L3-bus control mode) and bypass of auto mute
Selection of de-emphasis
Enable and control of digital mixer inside interpolator.
Mute status of interpolator
PLL lock and adaptive lock
Two times 40 bits of channels status bits of the SPDIF
input signal.
Stereo audio codec with SPDIF interface
Clock systems
C
RYSTAL OSCILLATOR CLOCK SYSTEM
2
S-bus) and recovers
11
Table 3 Output frequencies
Remarks:
The block diagram of the crystal oscillator and the PLL
circuit is given in Fig.3.
32 kHz
44.1 kHz
48 kHz
If an application mode is selected which does not need
a crystal oscillator, the crystal oscillator cannot be
omitted. The reason is that the interpolator switches to
the crystal clock when an SPDIF input signal is
removed. This switch prevents the noise shaper noise
from moving inside the audio band as the PLL gradually
decreases in frequency.
If no accurate output frequency is needed, the crystal
can be replaced with a resonator.
Instead of the crystal, a 12.288 MHz system clock can
be applied to pin XTALIN.
BASIC AUDIO
FREQUENCY
256
384
256
384
256
384
256
384
256
384
256
384
256
384
256
384
256
384
CONTROLLER
MICRO-
MODE
OUTPUT FREQUENCY
16 kHz
16 kHz
32 kHz
32 kHz
64 kHz
64 kHz
22.05 kHz
22.05 kHz
44.1 kHz
44.1 kHz
88.2 kHz
88.2 kHz
24 kHz
24 kHz
48 kHz
48 kHz
96 kHz
96 kHz
Preliminary specification
UDA1355H
256
256
256
STATIC MODE
32 kHz
44.1 kHz
48 kHz
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