參數(shù)資料
型號: SAA7712
廠商: NXP Semiconductors N.V.
英文描述: Sound effects DSP
中文描述: DSP的音效
文件頁數(shù): 20/44頁
文件大?。?/td> 178K
代理商: SAA7712
1999 Aug 05
20
Philips Semiconductors
Preliminary specification
Sound effects DSP
SAA7712H
8.5
Programmable phase-locked loop circuit
The clock of the DSP is generated with a programmable PLL.
To select the required DSP clock see Table 6. The N factor (ranging from 93 to 181) can be selected with I
2
C-bus bits
PLL_div(14 to 11), see Table 10. Depending on the crystal and the required DSP clock the I
2
C-bus bits pll_fs_sel and
bits dsp_turbo must be set. The maximum limit of the audio sample frequency is determined by DSP_clock/481 Hz.
Table 6
I
2
C-bus bits PLL_div and dividing factors N of the programmable DSP clock
Notes
1.
2.
3.
f
xtal
= 16.384 MHz; pll_fs_sel = 1 and dsp_turbo = 1, see Table 11.
f
xtal
= 18.432 MHz; pll_fs_sel = 1 and dsp_turbo = 1, see Table 11.
Usable frequency.
PLL_DIV(14 to 11)
N
DSP CLOCK FREQUENCY (MHz)
TDA9875
(1)
23.808
(3)
25.344
(3)
27.136
28.928
30.976
32.256
33.792
(3)
35.072
(3)
36.608
(3)
37.888
(3)
39.424
(3)
40.704
(3)
42.240
(3)
43.520
(3)
45.056
(3)
46.336
(3)
MSP3410D
(2)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
93 (default)
99
106
113
121
126
132
137
143
148
154
159
165
170
176
181
26.784
28.512
30.528
32.544
34.848
(3)
36.288
(3)
38.016
(3)
39.456
(3)
41.184
(3)
42.624
(3)
44.352
(3)
45.792
(3)
47.520
(3)
48.960
(3)
50.688
(3)
52.128
(3)
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