參數(shù)資料
型號(hào): SAA7114
廠商: NXP Semiconductors N.V.
英文描述: PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC combfilter, VBI-data slicer and high performance scaler
中文描述: PAL / NTSC制式/ SECAM視頻解碼器與自適應(yīng)PAL / NTSC制式梳狀濾波器,供血,數(shù)據(jù)限幅器和高性能縮放器
文件頁(yè)數(shù): 61/147頁(yè)
文件大?。?/td> 759K
代理商: SAA7114
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2004 Mar 03
61
Philips Semiconductors
Product specification
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb filter, VBI data slicer and high performance scaler
SAA7114
8.6
Audio clock generation
(subaddresses 30H to 3FH)
TheSAA7114incorporatesthegenerationofafield-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.
8.6.1
M
ASTER 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:
roundaudio frequency
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]
field frequency
=
ACNI[21:0]
round
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
205005
3C000
320CD
3210190
3210190
30FBCE
30FBCE
59.94
50
59.94
24.576
AMCLK = 256
×
44.1 kHz (11.2896 MHz)
32.11
50
225792
188348
225792
188348
37200
2DFBC
37200
2DFBC
2949362
2949362
3853517
3853517
2D00F2
2D00F2
3ACCCD
3ACCCD
59.94
50
59.94
24.576
AMCLK = 256
×
32 kHz (8.192 MHz)
32.11
50
163840
136670
163840
136670
28000
215DE
28000
215DE
2140127
2140127
2796203
2796203
20A7DF
20A7DF
2AAAAB
2AAAAB
59.94
50
59.94
24.576
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PDF描述
SAA7115 PAL/NTSC/SECAM Video Decoder with Adaptive PAL/NTSC Comb Filter, High Performance Scaler, I2C Sliced Data Readback and SQ PIXEL OUTPUT
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SAA7114E 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC comb filter, VBI data slicer and high performance scaler
SAA7114E/V2,518 功能描述:視頻 IC DIGITAL VIDEO DECODER W/COMB F RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7114H 制造商:NXP Semiconductors 功能描述: 制造商:Philips Semiconductor 功能描述:
SAA7114H/V2 制造商:NXP Semiconductors 功能描述:7114H/V2557
SAA7114H/V2,518 功能描述:視頻 IC DIGITAL VIDEO DECODER W/COMB F RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel