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參數(shù)資料
| 型號： | W9310 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | Direct Sequence Spread Spectrum Transceiver(直接序列擴展頻譜收發(fā)器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 32/36頁 |
| 文件大小： | 220K |
| 代理商： | W9310 |
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W9310
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window, WSL, should be large enough to take advantage of multipath combining but should not be so
large that excessive noise is allowed into the receiver, thus causing the sensitivity of the receiver to
degrade. In general, these parameters can be optimized for a particular environment through
experimental trial and error. Otherwise, it is recommended that these parameters be programmed to
values in the middle of the programmable range (for example, set PLSL to 12 samples wide, CNTLR
to 10 samples wide, and WSL to 8 samples wide). In the full-duplex or ping-pong mode, ACCRST1
should normally be set to "0" for no ACC1 reset during each "freeze PLL" period. The only instance
where ACCRST1 should be set "1" to reset ACC1 is if the frequency offset between the transmitter
and receiver is known to be very small. In this case, the performance of the PLL will be slightly
enhanced if ACC1 is reset during each "freeze PLL" period. In half-duplex operation. ACC1RES
should be set to "1" to always reset ACC1.
CI8 is used to set the W9310 to be either a master or a slave. Typically, in a cordless phone applica-
tion, the unit that initiates the signaling process (either the handheld or the base station) should be
programmed to be the master. Thus, when dialing into the PSTN, the handheld unit is configured to
be the master. When a phone call is received, on the other hand, the base station is configured as the
master. Note that for half-duplex operation, CI8
must
be set to low (e.g., as a slave). There is no
master or slave in half-duplex operation. Instead, the W9310 enters transmit mode when RTS_N is
asserted and stays in receive mode otherwise. The number of allowable errors in UW depends on the
application. For example, applications that can tolerate a larger BER can usually allow more UW
errors while still maintaining a reasonable communication link, as is the case with voice applications.
Finally, CI12 enables or disables the locking state machine. When used in conjunction with the
programmable allowable UW errors, the locking state machine gives the system designer the
flexibility to tailor the W9310 for a particular operating environment. Typically, if the locking state
machine is enabled and more UW errors allowed, the W9310 will continue to operate normally even
in a marginal communication link channel without repeatedly loosing the lock and going into
acquisition. The disadvantage of this strategy is the corresponding increase in data errors, which
might be intolerable in some critical applications. In this case, the number of allowable UW errors can
be reduced and the locking state machine turned off.
Sample System Block Diagram
Sample system block diagrams for cordless phone and data modem applications are shown below. In
addition, a sample MSK RF/analog front-end for the W9310 is also presented.
BPF
LNA
BPF
XTAL OSC
FM
Discriminator
DI
PLL
TR Switch
Synthesizer
LPF
MODOUT
SST
W9310
T/R
XTAL OSC
CoUP
Transmitter
Figure 12. Sample MSK Radio RF/Analog Front End
Note: In Figure 12, T/R is taken as a combination of the PLLSW, RFPWR, and TXEN signals, depending on the requirements
of the analog/RF circuit.
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相關代理商/技術參數(shù) |
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| W9310-16C64RC | 制造商:Winslow Adaptics Ltd 功能描述:40 way DIL to 44 way PLCC socket,16C64 |
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| W9310RC | 制造商:Winslow Adaptics Ltd 功能描述:40way DIL to 44way PLCC socket,2.1x1.2in |
| W9312 | 制造商:Apex Tool Group 功能描述:3/4 IN. X 12 FT MEZURALL POWER RETURN TAPE |
| W9312D | 制造商:Apex Tool Group 功能描述:3/4 IN. X 12 FT MEZURALL POWER RETURN TAPE, 10THS AND 100THS |
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