參數(shù)資料
型號： TMS320C6727B_07
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號處理
英文描述： Floating-Point Digital Signal Processors
中文描述： 浮點數(shù)字信號處理器
文件頁數(shù)： 101/116頁
文件大?。?/td> 999K
代理商： TMS320C6727B_07
www.ti.com
4.17 External Clock Input From Oscillator or CLKIN Pin
OSCV
DD
C
5
C
7
C
8
X
1
R
S
R
B
OSCIN
OSCOUT
C
6
OSCV
SS
CLKIN
Clock
Input
From
OSCIN
to
PLL
On-Chip 1.2-V Oscillator
(a)
External 3.3-V LVCMOS-Compatible Clock Source
(b)
OSCV
DD
OSCIN
OSCOUT
OSCV
SS
CLKIN
Clock
Input
From
CLKIN
to
PLL
CV
DD
(1.2 V)
NC
TMS320C6727B, TMS320C6726B, TMS320C6722B, TMS320C6720
Floating-Point Digital Signal Processors
SPRS370C–SEPTEMBER 2006–REVISED OCTOBER 2007
The C672x device includes two choices to provide an external clock input, which is fed to the on-chip PLL
to generate high-frequency system clocks. These options are illustrated in
Figure 4-42
.
Figure 4-42
(a) illustrates the option that uses an on-chip 1.2-V oscillator with external crystal circuit.
Figure 4-42
(b) illustrates the option that uses an external 3.3-V LVCMOS-compatible clock input with
the CLKIN pin.
Note that the two clock inputs are logically combined internally before the PLL so the clock input that is not
used must be tied to ground.
Figure 4-42. C672x Clock Input Options
If the on-chip oscillator is chosen, then the recommended component values for
Figure 4-42
(a) are listed
in
Table 4-40
.
Table 4-40. Recommended On-Chip Oscillator Components
FREQUENCY
22.579
22.579
24.576
24.576
XTAL TYPE
AT-49
SMD-49
AT-49
SMD-49
X
1
C
5(1)
470 pF
470 pF
470 pF
470 pF
C
6(1)
470 pF
470 pF
470 pF
470 pF
C
7
8 pF
8 pF
8 pF
8 pF
C
8
8 pF
8 pF
8 pF
8 pF
R
B
R
S
0
0
0
0
KDS 1AF225796A
KDS 1AS225796AG
KDS 1AF245766AAA
KDS 1AS245766AHA
1 M
1 M
1 M
1 M
(1)
Capacitors C
5
and C
6
are used to reduce oscillator jitter, but are optional. If C
and C
6
are not used, then the node connecting
capacitors C
7
and C
8
should be tied to OSCV
SS
and OSCV
DD
should be tied to CV
DD
.
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Peripheral and Electrical Specifications
101
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