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参数资料
| 型号： | MC13180 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 通信及网络 |
| 英文描述： | 2.4 GHz Low Power Wireless Transceiver IC for Bluetooth⑩ Applications |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC48 |
| 封装： | PLASTIC, QFN-48 |
| 文件页数： | 32/58页 |
| 文件大小： | 992K |
| 代理商： | MC13180 |
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32
MC13180 Product Preview
MOTOROLA
Functional Description
4.22 Data Clock Operation
The data clock phase lock loop is responsible for providing a constant 24 MHz reference for use
throughout the device. The MC13180 uses a simple integer
-
N synthesizer to derive a 24 MHz clock (CLK)
from the reference frequency. 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 illustrated in
Figure 20.
For the circuit in Figure 42, 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.
More details about PLL loop filters can be obtained from Motorola application note 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
External / 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 16. Oscillator Negative Resistance versus
Electronic Parallel Crystal Trim (C
PT
)
(Crystal Boost Enable R11/4) = 1
Figure 17. Oscillator Negative Resistance versus
Crystal Capacitor Ratio
(Crystal Boost Enable R11/4) = 0
Figure 18. Crystal Start
-
up Time versus Capacitor
Ratio
Figure 19. Crystal Frequency Pulling versus
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 Figure42, T
A
= 25°C
Curve Measured with 13 MHz Crystal Reference
Crystal Load Capacitance Ratio = 1.8 (C5/C6)
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 Figure42, 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
6.00
1.0
2.0
3.0
4.0
5.0
CAPACITOR RATIO (C5/C8)
See Figure42, T
A
= 25°C
13 MHz Crystal Reference
C
600
400
200
0
-200
-400
-6000
ELECTRONIC PARALLEL TRIM VALUE (R6/14-10)
4.0
8.0
12
16
20
24
28
32
See Figure42, T
A
= 25°C
Crystal Frequency Delta measured relative to
intial frequency for R/14-10 = 12 (decimal).
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