參數(shù)資料
型號： MC72000
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Integrated Bluetooth Radio
中文描述： 集成藍(lán)牙無線
文件頁數(shù)： 47/156頁
文件大?。?/td> 1782K
代理商： MC72000
MOTOROLA
MC72000
Advance Information Data Sheet
Go to: www.freescale.com
47
For applications utilizing f
ref
Internal > 20 MHz, the external low pass filter with a 1.0 kHz corner
frequency is still usable. However, due to the R counter limitations, the R counter is programmed to
generate the f
ref
Internal to 40 kHz (recommended). In case of a 26 MHz external reference or other
frequencies above 20 MHz, R = 650
10
and N = 600
10
.
The N and R counters can only divide by integer values and the greatest common divider must be found to
represent f
ref
Internal and achieve CLK. Table 24 provides the appropriate values for various f
ref
Internal.
For applications requiring a faster data clock PLL response time, refer to the data clock electrical
characteristics and
An Improved PLL Design Method Application Note
(document number AN1253/D)
Additional data clock characteristic data is shown in Figure 28 and Figure 29.
Figure 27. General Model for the PLL
Where:
K
pd
= Phase Detector Gain Constant
K
f
= Loop filter transfer function
K
VCO
= VCO Gain Constant
K
n
= Divide Ratio (1/N)
f
ref
Internal
= Input Frequency
fo
= Output frequency
fo/N
= Feedback frequency divided by N
Table 24. Data Clock R and N Counter Values for 20 kHz f
ref
Internal with 1.0 kHz LBW
f
ref
External
(MHz)
f
ref
Internal
(kHz)
R Counter
(Decimal)
N Counter
(Decimal)
LBW
(kHz)
12
20
600
1200
1.0
13
20
650
1200
1.0
14.4
20
720
1200
1.0
16.8
20
840
1200
1.0
19.22
20
961
1200
1.0
19.68
20
984
1200
1.0
19.88
20
994
1200
1.0
26
40
650
600
1.4
÷R
f
ref
External
f
ref
Internal
Phase
Detector (K
pd
)
Filter
(K
f
)
VCO
(K
VCO
)
Divider
(K
n
)
fo
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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