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参数资料
| 型号： | MAS3507D |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | 通用总线功能 |
| 英文描述： | MPEG 1/2 Layer 2/3 Audio Decoder |
| 中文描述： | 的MPEG 1 / 2 2 / 3层音频解码器 |
| 文件页数： | 36/60页 |
| 文件大小： | 867K |
| 代理商： | MAS3507D |
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MAS 3507D
PRELIMINARY DATA SHEET
36
Micronas
3.7.2.1. PLL Offset for 44/48 kHz Sampling Frequency
With these memory cells it is possible to choose other
frequencies than the standard CLKI frequencies.
Please note:
– PLLOffset48 is valid for
f
s
= 48, 24, 12, 32, 16, or 8 kHz.
– PLLOffset44 is valid for
f
s
= 44.1, 22.05, 11.025 kHz.
Table 3–16 shows the default values which will be set
by the firmware according to the start-up configuration.
It is also possible to run the MAS 3507D with other
clocks. In broadcast mode, it is necessary to adjust the
PLLOffsets to this clock, otherwise it will not lock to the
MPEG bit stream. In multimedia mode, it is recom-
mended to adjust the PLLOffsets to the crystal, other-
wise it would result in a frequency shift (music will be
played faster or slower). For adjusting, the following
procedure must be done:
– Calculate the PLLOffsets according to:
with
0.74 < PLLOffset < 0.74. This corresponds to
a frequency range of 14.31...14.73 MHz for the
crystal, if both 44.1 kHz and 48 kHz based sample
frequencies are used. The range is extended in an
application with a fixed sampling frequency, as
Table 3–17 shows.
– Write the PLLOffsets to the memory (PLLOffset48
D0:$36d, PLLOffset44 D0:$36e).
– Send a ‘run $475’ command. With the jump to this
address, the settings in the memory will be valid for
the internal processing.
Example:
A very common crystal frequency is 14.31818 MHz
(NTSC color subcarrier). The
and
are inside the range
0.74 ... 0.74.
Address
R/W
Name
Function
Default
D0:$36d
r/w
PLLOffset48
PLL offset (if f
s
= 48, 24, 12, 32, 16, or 8 kHz),
validate by ‘run $475’ command
D0:$36e
r/w
PLLOffset44
PLL offset (if f
s
= 44.1, 22.05, 11.025 kHz),
validate by ‘run $475’ command
Table 3–16:
PLLOffset48 and PLLOffset44
f
CLKI
PLLOffset48
PLLOffset44
14.725 MHz
0.351986
0.732862
f
CLKI
PLLOffset
48
13
+
-----------24,576 8
PLLOffset
44
+
13
--------22,5792 8
=
=
Table 3–17:
f
ClkI
for max./ min. PLLOffsets
PLLOffset
f
CLKI
for f
s
related to
48 kHz
fCLKI for fs
related to
44.1 kHz
0.74
16.0365 MHz
14.7336 MHz
0.74
14.309 MHz
13.1465 MHz
PLLOffset
48
14,31818
24,576 8
13
–
0,7314
=
=
PLLOffset
44
14,31818
22,5792 8
13
–
0,3843
–
=
=
相关PDF资料 |
PDF描述 |
|---|---|
| MAS3559F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS35x9F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3509F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3519F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3529F | MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAS3509F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3519F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3529F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3539F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
| MAS3549F | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:MAS 35x9F MPEG Layer 2/3, AAC Audio Decoder, G.729 Annex A Codec |
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