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參數(shù)資料
| 型號： | LMX9830SM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | BluetoothTM Serial Port Module |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PBGA60 |
| 封裝： | 9 X 6 MM, 1.20 MM HEIGHT, 0.80 MM PITCH, PLASTIC, FBGA-60 |
| 文件頁數(shù)： | 27/46頁 |
| 文件大?。?/td> | 664K |
| 代理商： | LMX9830SM |
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www.national.com
L
9.0 Digital Smart Radio
(Continued)
Components can then be calculated from loop filter coefficients
Some typical values for the LMX9830 are:
Which give the following component values:
9.9.2 Phase Noise and Lock-Time Calculations
Phase noise has three sources, the VCO, crystal oscillator
and the rest of the PLL consisting of the phase detector,
dividers, charge pump and loop filter. Assuming the VCO
and crystal are very low noise, it is possible to put down
approximate equations that govern the phase noise of the
PLL.
Phase noise (in-band) = PN1Hz + 20Log[N] +
10Log[F
comp
]
Where PH1Hz is the PLL normalized noise floor in 1 Hz
resolution bandwidth.
Further out from the carrier, the phase noise will be
affected by the loop filter roll-off and hence its bandwidth.
As a rule-of-thumb;
Phase noise = 40Log[
F
c
]
Where
a fraction.
F
c
is the relative change in loop BW expressed as
For example if the loop bandwidth is reduced from 100kHz
to 50kHz or by one half, then the change in phase noise
will be -12dB. Loop BW in reality should be selected to
meet the lower limit of the modulation deviation, this will
yield the best possible phase noise.
Even further out from the carrier, the phase noise will be
mainly dominated by the VCO noise assuming the crystal
is relatively clean.
Lock-time is dependent on three factors, the loop band-
width, the maximum frequency jump that the PLL must
make and the final tolerance to which the frequency must
settle. As a rule-of-thumb it is given by:
Where
These equations are approximations of the ones used by Webench to calculate phase noise and lock-time.
C1
T2
2
-A2
1
(
1
T2 A0
T2 A1
A2
–
+
+
=
C3
2
1 T2
C1
2
T2
+
A1 C1
C1
–
A2
–
A0
T2
2
A2
=
C2
A0
C1
C3
–
–
=
R2
C2
=
R3
C1 C3 T2
=
Comparison Frequency
Phase Margin
Loop bandwidth
T3 over T1 ratio
Gamma
VCO gain
Charge pump gain
Fout
13
48
100
40
1.0
120
0.6
2441
MHz
Pl rad
kHz
%
MHz per V
mA
MHz
C1
C2
C3
0.17
2.38
0.04
nF
nF
nF
R2
R3
1737
7025
ohms
ohms
LT
F
C
400
=
1
log
10
F
–
(
)
F
Frequency
tolerance
jump
–
–
Frequency
=
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| LMX9830SMX | BluetoothTM Serial Port Module |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX9830SM/NOPB | 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| LMX9830SMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:BluetoothTM Serial Port Module |
| LMX9830SMX/NOPB | 功能描述:射頻收發(fā)器 RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| LMX9838 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Bluetooth㈢ Serial Port Module |
| LMX9838_0709 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Bluetooth㈢ Serial Port Module |
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