參數(shù)資料
型號： 935267395518
廠商： NXP SEMICONDUCTORS
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL DECODER, PBGA156
封裝： 15 X 15 MM, 1.15 MM HEIGHT, PLASTIC, MS-034, SOT-472-1, BGA-156
文件頁數(shù)： 143/178頁
文件大?。?/td> 988K
代理商： 935267395518
2004 Jul 22
67
Philips Semiconductors
Product specication
Multistandard video decoder with adaptive
comb lter and component video input
SAA7118
8.7
Audio clock generation
(subaddresses 30H to 3FH)
The SAA7118 incorporates the generation of a field-locked
audio clock as an auxiliary function for video capture.
An audio sample clock, that is locked to the field
frequency, ensures that there is always the same
predefined number of audio samples associated with a
field, or a set of fields. This ensures synchronous playback
of audio and video after digital recording (e.g. capture to
hard disk), MPEG or other compression, or non-linear
editing.
8.7.1
MASTER AUDIO CLOCK
The audio clock is synthesized from the same crystal
frequency as the line-locked video clock is generated. The
master audio clock is defined by the parameters:
Audio master Clocks Per Field, ACPF[17:0] 32H[1:0]
31H[7:0] 30H[7:0] according to the equation:
Audio master Clocks Nominal Increment, ACNI[21:0]
36H[5:0] 35H[7:0] 34H[7:0] according to the equation:
See Table 22 for examples.
Remark: For standard applications the synthesized audio
clock AMCLK can be used directly as master clock and as
input clock for port AMXCLK (short cut) to generate
ASCLK and ALRCLK. For high-end applications it is
recommended to use an external analog PLL circuit to
enhance the performance of the generated audio clock.
ACPF[17:0]
round
audio frequency
field frequency
------------------------------------------
=
ACNI[21:0]
round
audio frequency
crystal frequency
---------------------------------------------
2
23
×
=
Table 22 Programming examples for audio master clock generation
XTALO
(MHz)
FIELD
(Hz)
ACPF
ACNI
DECIMAL
HEX
DECIMAL
HEX
AMCLK = 256
× 48 kHz (12.288 MHz)
32.11
50
245760
3C000
3210190
30FBCE
59.94
205005
320CD
3210190
30FBCE
24.576
50
59.94
AMCLK = 256
× 44.1 kHz (11.2896 MHz)
32.11
50
225792
37200
2949362
2D00F2
59.94
188348
2DFBC
2949362
2D00F2
24.576
50
225792
37200
3853517
3ACCCD
59.94
188348
2DFBC
3853 517
3ACCCD
AMCLK = 256
× 32 kHz (8.192 MHz)
32.11
50
163840
28000
2140127
20A7DF
59.94
136670
215DE
2140127
20A7DF
24.576
50
163840
28000
2796203
2AAAAB
59.94
136670
215DE
2796203
2AAAAB
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