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參數(shù)資料
| 型號： | LV2700V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Spread Spectrum Communications IC(頻譜擴展通訊芯片) |
| 中文描述： | 擴頻通信集成電路（頻譜擴展通訊芯片） |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LV2700V |
Description of Operation and Application Information
1. Principle of Operation
The LV2700V has all the transmission and reception functions necessary for carrying out half-duplex communication
using spread spectrum communication. The spectrum spreading is being done using the direct sequence (DS) method
in which the carrier wave is multiplied by the PN code. The PN code used for spectrum spreading at this time is the
typical M sequence code, and it is possible to select six types of code lengths from 15 chips to 511 chips. Further,
since the clock for generating the PN code is derived from the carrier wave by frequency division, a system is
realized in which the carrier wave and the PN code are synchronized in phase thereby obtaining a configuration with
simplified PN synchronization system.
2. Transmission Mode
The transmission block is shown in Fig. 1.
Fig. 1 The transmission block
PN Code generation method
The PN (Pseudo-random Noise) code is, as its name suggests, a pulse train in which the occurrence probabilities of 1’s
and 0’s are pseudo-random in nature, and is required for spectrum spreading in the direct spreading method. Although
there are many types of PN code series, the most typical among them, the M sequence PN code (maximum-length
sequence ) is being used in the LV2700V. The generator of the M sequence PN code is configured using a shift
register and feedback circuit. Fig. 2 shows the configuration of a PN code generator of the 15-chip type. In the
LV2700V, it is possible to select among six types of PN codes from 15 chips to 511 chips. Although there are several
shift register feedback methods (called feedback taps) in the case of M sequence of code length more than 15 chips, in
the LV2700V, only one type of feedback tap is used for each code length. The actual positions of the feedback taps are
shown in Table 1.
Fig. 2 PN Code generator
No. 5651-8/20
LV2700V
Data input
DS Output
PN Code
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