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： 集成藍牙無線
文件頁數(shù)： 46/156頁
文件大小： 1782K
代理商： MC72000
46
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
MOTOROLA
Radio Functional Description
6.6 Data Clock Operation
The data clock phase lock loop is responsible for providing a constant 24 MHz reference for use
throughout the device. The MC72000 uses a simple integer-N synthesizer to derive a 24 MHz clock (CLK)
from the reference frequency. This allows the MC72000 to adapt to external reference oscillator or crystal
in the range of 12 to 26 MHz. The counter values must always be set to the appropriate values to generate
this 24 MHz clock frequency. The general model for the phase lock loop (PLL) is shown in Figure 27.
For the circuit in Figure 92, the external low pass filter has a loop filter bandwidth (LBW) of 1.0 kHz. This
proves to be adequate for any value of external reference frequency that is an integral multiple of 20 kHz.
The external low pass filter requires one capacitor. More details about PLL loop filters can be obtained
from
An Improved PLL Design Method Application Note
(document number AN1253/D).
The R-counter of the synthesizer (R6/9-0) is set to a value which will set the internal reference frequency
f
ref
Internal to 20 kHz; thus, R = f
ref
Internal/20 kHz. The N-counter of the synthesizer (R7/10-0) is set to
multiply f
ref
Internal to 24 MHz; thus N = 24 MHz/f
ref
Internal. For the case of a 13 MHz external
reference, R = 650
10
and N =1200
10
.
Figure 23. Oscillator Negative Resistance vs.
Electronic Parallel Crystal Trim (C
PT
)
(Crystal Boost Enable R11/4) = 1
Figure 24. Oscillator Negative Resistance vs.
Crystal Capacitor Ratio
(Crystal Boost Enable R11/4) = 0
Figure 25. Crystal Start-up Time vs. Capacitor
Ratio
Figure 26. Crystal Frequency Pulling vs.
Electronic Parallel Trim Value
O
)
0
-200
-400
-600
-800
-1000
-1200
-1400
T
A
= -20°C
25°C
85°C
0
ELECTRONIC PARALLEL CRYSTAL TRIM (R6/14-10)
4.0
8.0
12
16
20
24
28
32
See Figure 4, T
A
= 25°C
Curve Measured with 13 MHz Crystal Reference
Crystal Load Capacitance Ratio = 1.8 (C15/C16)
O
)
-40
-50
-60
-70
-80
-90
-100
-110
-120
-1300
CAPACITOR RATIO (C5/C8)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
See Figure 4, T
A
= 25°C
Curve Measured with 13 MHz Crystal Reference
Parallel Crystal Trim (R6/14-10) = 16 (decimal)
C
11
10
9.0
8.0
7.0
6.0
0
1.0
2.0
3.0
4.0
5.0
CAPACITOR RATIO (C5/C8)
See Figure 4, T
A
= 25°C
13 MHz Crystal Reference
C
600
400
200
0
-200
-400
-600
0
ELECTRONIC PARALLEL TRIM VALUE (R6/14-10)
4.0
8.0
12
16
20
24
28
32
See Figure 4, T
A
= 25°C
Crystal Frequency Delta measured relative to
initial frequency for R/14-10 = 12 (decimal).
F
For More Information On This Product,
n
.
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