saa7118 NXP Semiconductors, saa7118 Datasheet - Page 68

• Manufacturer Part Number: saa7118
• Description: Multistandard Video Decoder With Adaptive Comb Filter And Component Video Input
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 15219
Product data sheet
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:
See
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.
Table 22:
XTALO (MHz) Field (Hz)
AMCLK = 256
32.11
24.576
AMCLK = 256
32.11
24.576
AMCLK = 256
32.11
24.576
•
•
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:
Table 22
Programming examples for audio master clock generation
for examples.
50
59.94
50
59.94
50
59.94
50
59.94
50
59.94
50
59.94
48 kHz (12.288 MHz)
44.1 kHz (11.2896 MHz)
32 kHz (8.192 MHz)
ACPF[17:0]
Rev. 06 — 22 December 2005
ACPF
Decimal
245760
205005
-
-
225792
188348
225792
188348
163840
136670
163840
136670
=
ACNI[21:0]
Multistandard video decoder with adaptive comb filter
round
audio frequency
--------------------------------------
field frequency
=
Hex
3 C000
3 20CD
-
-
3 7200
2 DFBC
3 7200
2 DFBC
2 8000
2 15DE
2 8000
2 15DE
round
---------------------------------------- - 2
crystal frequency
audio frequency
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
ACNI
Decimal
3210190
3210190
-
-
2949362
2949362
3853517
3853 517
2140127
2140127
2796203
2796203
SAA7118
23
Hex
30 FBCE
30 FBCE
-
-
2D 00F2
2D 00F2
3A CCCD
3A CCCD
20 A7DF
20 A7DF
2A AAAB
2A AAAB
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