- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358961 > LV2700V (Sanyo Electric Co.,Ltd.) Spread Spectrum Communications IC(頻譜擴(kuò)展通訊芯片) PDF資料下載
參數(shù)資料
| 型號： | LV2700V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Spread Spectrum Communications IC(頻譜擴(kuò)展通訊芯片) |
| 中文描述： | 擴(kuò)頻通信集成電路（頻譜擴(kuò)展通訊芯片） |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LV2700V |
4. FM, FSK Modulation
When the input signal is an analog signal, the modulation is FM and the modulation is FSK when the input signal is
a digital signal. However, the modulation method is common to both, and the modulating signal is applied as the
analog signal to the control terminal of the VCO in the PLL.
Data Input
The data is input to pin 17. Pin 17 is a dedicated data input terminal. This signal is passed through a 1 Vpp limiter
amplifier and a 300 kHz LPF and is output at pin 18. The output at pin 18 is connected via an RC series circuit to pin
22 which is the loop filter terminal.
Analog Input
Since the input pin 17 is dedicated to data, it cannot be used for analog inputs. Connect analog input signals via an
RC series circuit to pin 22.
5. FM, FSK Demodulation
In the reception mode, the FM demodulated signal is obtained from the loop filter terminal of pin 25. An output after
passing through a buffer amplifier is output at pin 24 in order to take out the demodulated signal without affecting the
loop filter constants. However, as explained earlier, since it is not possible to make the loop bandwidth sufficiently
narrow due to the setting of the time response characteristics of the PN synchronization initial acquisition process, it
is not possible to sufficiently suppress the PN component in the output at the loop filter terminal. Therefore, a 150
kHz LPF is incorporated to remove the PN component included in the demodulated signal. However, since the
fundamental PN frequency becomes less than 150 kHz when the PN code length becomes longer than 127 chips, it is
not possible to sufficiently suppress the PN components by the built-in filter. Hence, when using PN code lengths of
more than 127 chips, add an LPF between pin 23 and pin 24. The fundamental PN frequency at each PN code length
is given in the table below. Since these frequencies become the fundamental frequencies of the PN leakage
component, use an LPF that has sufficient attenuation at this frequency. Further, these values also become the
maximum data transfer rates during data transmission. However, when the built-in 150 kHz LPF is used, the
maximum rate will be limited to less than 256 kbps.
PN Clock frequency
PN code length
Note: Fundamental PN frequency = —————————
Analog Output
The analog output can be obtained at pin 10.
Data Output
The data is output at pin 8 which is an open drain output. In order to suppress the output of noise under the no-
modulation conditions, hysteresis is provided by connecting a feedback resistor of about 510 k
between pin 8 and
pin 10. Care should be taken because the effective sensitivity becomes lower if the feedback resistor for hysteresis is
made lower than 200 k
.
No. 5651-14/20
LV2700V
PN Code length
Fundamental PN frequency
15
655 kHz
31
317 k
63
156 k
127
77 k
255
38 k
511
19 k
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LV3100M | Parametric Equalizer |
| LV320MH | 32 Megabit (4 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control |
| LV3400M | FM Multiplex Filter(FM多路濾波器) |
| LV3400 | FM Multiplex Filter |
| LV3403M | 3V Operation Filter for FM Multiplex Broadcasting Reception(用于FM多路廣播接收的3V運算濾波器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LV-271M2G---3035S | 制造商:Surge Components Inc 功能描述:CAP ALUM 270UF 400V ?20% 2000LHRS 30 X 35 - Bulk |
| LV-271M2W---2550S | 制造商:Surge Components Inc 功能描述:CAP ALUM 270UF 450V ?20% 2000LHRS 25 X 50 - Bulk |
| LV-271M2W---3040S | 制造商:Surge Components Inc 功能描述:CAP ALUM 270UF 450V ?20% 2000LHRS 30 X 40 - Bulk |
| LV-271M2W---3535S | 制造商:Surge Components Inc 功能描述:CAP ALUM 270UF 450V ?20% 2000LHRS 35 X 35 - Bulk |
| LV275DI-Q4 | 制造商:Okaya Electric America Inc 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。