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參數(shù)資料
| 型號(hào)： | TSC2302 |
| 元件分類： | Codec |
| 英文描述： | PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| 中文描述： | 可編程觸摸屏控制器，立體聲編解碼器 |
| 文件頁(yè)數(shù)： | 31/81頁(yè) |
| 文件大?。?/td> | 1211K |
| 代理商： | TSC2302 |
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www.ti.com
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FOUT
MCLK
P
(4N
A)
3
,(N
A),MCLK
P
1MHz
(3)
TSC2302
SLAS394–JULY 2003
Bit [11:8] — PDC3 - PDC0
PLL Predivider Control. This bit controls the predivider to the internal PLL. These bits represent a 4-bit straight
binary number corresponding to the variable P in the PLL control equation discussed later in this section. The
legal range of these bits is 1h to Fh. The default of these bits is Fh.
Bit [7:4] — A3 - A0
A
Control. This bit represent a 4-bit straight binary number corresponding to the variable A in the PLL control
equation discussed later in this section. The legal range of these bits is 0h to Fh. The default of these bits is Fh.
Bit [3:0] — N3 - N0
N
Control. This bit represents a 4-bit straight binary number corresponding to the variable N in the PLL control
equation discussed later in this section. The legal range of these bits is 0h to Fh. The default of these bits is Fh.
When using a nonaudio standard MCLK frequency or crystal that is not covered by any of the automatic PLL
settings in MCLK[1:0], the user must manually configure the TSC2302 PLL to generate the proper clock for the
audio data converters. The proper clock for any sampling rates that are submultiples of 44.1 kHz is 512 x 44.1
kHz = 22.5792 MHz. This frequency is valid for 44.1 kHz, 22.05 kHz, and 11.025 kHz. The proper clock for any
sampling rates that are submultiples of 48 kHz is 512 x 48 kHz = 24.576 MHz. This frequency is valid for 48 kHz,
32 kHz, 24 kHz, 16 kHz, 12 kHz, and 8 kHz. Equation 3 is used to obtain the proper frequency. Since variables
P, N
, and
A
are integers, the exact proper clock frequencies can not always be obtained. However, examples are
provided for common MCLK/crystal frequencies that minimize the error of the PLL output. One constraint is the
N
must always be greater than or equal to
A
. Another constraint is that the output of the MCLK predivider (the
MCLK/P term) should be greater than 1 MHz.
P
can be any integer from 1 to 15, inclusive.
N
and
A
can be any
integer from 0 to 15, inclusive. In some situations, settings outside of these constraints may work, but should be
verified by the user beforehand. Table 22 shows some settings that have been tested and confirmed to work by
TI.
Table 22. PLL Settings
MCLK (MHZ)
DESIRED
F
OUT
(MHZ)
P
A
N
ACTUAL F
OUT
(MHZ)
% ERROR
12
24.576
7
7
9
24.57143
-0.019
13
24.576
9
7
11
24.55556
-0.083
16
24.576
13
12
12
24.61538
0.160
19.2
24.576
13
10
10
24.61538
0.160
19.68
24.576
12
9
9
24.60000
0.097
3.6869
22.5792
3
7
12
22.53106
-0.213
12
22.5792
11
10
13
22.54545
-0.149
13
22.5792
14
13
15
22.59524
0.071
16
22.5792
13
11
11
22.56410
-0.067
19.2
22.5792
15
9
11
22.61333
0.151
19.68
22.5792
9
3
7
22.59556
0.072
31
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