dsp56824 Freescale Semiconductor, Inc, dsp56824 Datasheet - Page 24

• Manufacturer Part Number: dsp56824
• Description: 16-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

3.5 External Components for the PLL
The on-chip PLL requires an extra circuit connected to the SXFC pin, as shown in Figure 9. As indicated
in Table 23, the values of R, C
the desired operating frequency from the input frequency selected. This circuit affects the performance of
the PLL.
24
No.
1.
External
10
Note: The midpoint is V
Table 23. Recommended Component Values for PLL Multiplication Factors
Clock
This is the minimum time required after the PLL setup is changed to ensure reliable operation
PLL stabilization time after crystal oscillator start-up time
10%
50%
90%
Multiplication
Table 22. Clock Operation Timing (Continued)
Factor
IL
7
1024
512
256
128
100
80
40
10
+ (V
Freescale Semiconductor, Inc.
4
2
1
For More Information On This Product,
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, and C should be chosen based on the Multiplication Factor used to derive
Figure 8. External Clock Timing
– V
Characteristics
2
IL
)/2.
DSP56824 Technical Data
Go to: www.freescale.com
250 pF
250 pF
2.7 nF
2.7 nF
2.7 nF
2.7 nF
2.7 nF
2.7 nF
2.7 nF
10 nF
8
C
l
3
5 k
5 k
5 k
2 k
2 k
2 k
2 k
2 k
1 k
1 k
1
R
6
Min
15 nF
15 nF
15 nF
15 nF
15 nF
15 nF
15 nF
15 nF
15 nF
15 nF
—
C
70 MHz
5
Max
10
10%
50%
90%
V
V
AA0182
IH
IL
Unit
ms