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參數(shù)資料
| 型號(hào)： | 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)： | 28/46頁 |
| 文件大?。?/td> | 664K |
| 代理商： | LMX9830SM |
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28
L
9.0 Digital Smart Radio
(Continued)
9.9.3 Practical Optimization
In an example where frequency drift and drift rate can be
improved though loop filter tweaks, consider the results
taken below. The drift rate is 26.1 kHz per 50us and the
maximum drift is 25 kHz for DH1 packets, both of which are
exceeding or touching the Bluetooth pass limits. These
measurements are taken with component values shown
above
Results below were taken on the same board with three
loop filter values changed. C2 and R2 have been
increased in value and C1 has been reduced. The drift rate
has improved by 13 kHz per 50 μs and the maximum drift
has improved by 10 kHz
The effect of changing these three components is to
reduce the loop bandwidth which reduces the phase noise.
The reduction in this noise level corresponds directly to the
reduction of noise in the payload area where drift is mea-
sured. This noise reduction comes at the expense of lock-
time which can be increased to 120 μs without suffering
any ill effects, however if we continue to reduce the loop
BW further the lock-time will increase such that the PLL
does not have time to lock before data transmission and
the drift will again increase. Before the lock-time goes out
of spec, the modulation index will start to fall since it is
being cut by the reducing loop BW. Therefore a compro-
mise has to be found between lock-time, phase noise and
modulation, which yields best performance.
Note:
The values shown in the LMX9830 datasheet, are
the best case optimized values that have been
shown to produce the best overall results and are
recommended as a starting point for this design.
Another example of how the loop filter values can affect
frequency drift rate, these results below show the DUT with
maximum drift on mid and high channels failing. Adjusting
the loop bandwidth as shown provides the improvement
required to pass qualification.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMX9830SMX | BluetoothTM Serial Port Module |
| LMX9838 | Bluetooth Serial Port Module |
| LMX9838SB | Bluetooth Serial Port Module |
| LMX9838SBX | Bluetooth Serial Port Module |
| LNBEH21 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE |
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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