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參數(shù)資料
| 型號： | TMS320LF2407PGS |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | DSP CONTROLLERS |
| 中文描述： | DSP控制器 |
| 文件頁數(shù)： | 49/115頁 |
| 文件大小： | 1511K |
| 代理商： | TMS320LF2407PGS |
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SPRS094I APRIL 1999 REVISED SEPTEMBER 2003
49
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
external reference crystal clock option
The internal oscillator is enabled by connecting a crystal across the XTAL1/CLKIN and XTAL2 pins as shown
in Figure 12a. The crystal should be in fundamental operation and parallel resonant, with an effective series
resistance of 30
and a power dissipation of 1 mW; it should be specified at a load capacitance of 20 pF.
external reference oscillator clock option
The internal oscillator is disabled by connecting a clock signal to XTAL1/CLKIN and leaving the XTAL2 input
pin unconnected as shown in Figure 12b.
External Clock Signal
(Toggling 03.3 V)
Cb1
(see Note A)
XTAL2
XTAL1/CLKIN
XTAL1/CLKIN
XTAL2
Crystal
Cb2
(see Note A)
(a)
(b)
NC
NOTE A: TI recommends that customers have the resonator/crystal vendor characterize the operation of their device with the DSP chip. The
resonator/crystal vendor has the equipment and expertise to tune the tank circuit. The vendor can also advise the customer regarding
the proper tank component values that will ensure start-up and stability over the entire operating range.
Figure 12. Recommended Crystal/Clock Connection
loop filter
The PLL module uses an external loop filter circuit for jitter minimization. The components for the loop filter
circuit are R1, C1, and C2. The capacitors (C1 and C2) must be non-polarized. This loop filter circuit is connected
between the PLLF and PLLF2 pins (see Figure 11). For examples of component values of R1, C1, and C2 at
a specified oscillator frequency (XTAL1), see Table 10.
Table 10. Loop Filter Component Values With Damping Factor = 2.0
XTAL1/CLKIN FREQUENCY
(MHz)
R1 (
) (
±
5% TOLERANCE)
C1 (
μ
F) (
±
20% TOLERANCE)
C2 (
μ
F) (
±
20% TOLERANCE)
4
4.7
3.9
0.082
5
2.7
0.056
6
6.8
1.8
0.039
7
8.2
1.5
0.033
8
9.1
1
0.022
9
10
0.82
0.015
10
11
0.68
0.015
11
12
0.56
0.012
12
13
0.47
0.01
13
15
0.39
0.0082
14
15
0.33
0.0068
15
16
0.33
0.0068
16
18
0.27
0.0056
17
18
0.22
0.0047
18
20
0.22
0.0047
19
22
0.18
0.0039
20
24
0.15
0.0033
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