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參數(shù)資料
| 型號： | MC13180 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 2.4 GHz Low Power Wireless Transceiver IC for Bluetooth⑩ Applications |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC48 |
| 封裝： | PLASTIC, QFN-48 |
| 文件頁數(shù)： | 33/58頁 |
| 文件大?。?/td> | 992K |
| 代理商： | MC13180 |
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Functional Description
MOTOROLA
MC13180
Product Preview
33
For applications utilizing f
ref
External > 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). For the case of a 26 MHz external reference, 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 16 provides the appropriate values for various f
ref
Externals.
For applications that require a faster data clock PLL response time, refer to the data clock electrical
characteristics and Motorola application note AN1253/D
.
Additional data clock characteristic data is shown in Figures 21 and 22.
Figure 20. 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 16.
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
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