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參數(shù)資料
| 型號： | WE904 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx單芯片F(xiàn)M收發(fā)器 |
| 文件頁數(shù)： | 30/39頁 |
| 文件大小： | 623K |
| 代理商： | WE904 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 36
Rev Date: 2003 May 27
e.g.
AGC on
Rx on, Tx on,
1.0mA Rx charge pump current, 0.2mA Tx charge pump polarity,
normal Rx and Tx PLL charge pump polarity,
ignore manual gain control bits
AFC enable, AGC Reset on (WE905),
Analogue AUDO,
Normal mode,
Signal evaluation period 14ms x (130kHz / BWdm)
Programming word = 001000 010 XXXXX 00 01 11 1 11
CIRCUIT DESIGN CONSIDERATIONS
BOARD LAYOUT
Designing ultra-high frequency (UHF) RF circuits requires careful attention to detail and layout. Careful
attention to layout should be observed to minimize stray inductance and capacitance effects. This
attention to detail will preserve RF sensitivity of the device. At high frequencies, micro strip or strip-line
transmission line techniques must be employed. Using “state-of-the-art” CAD techniques for PCB layout,
standard FR-4 fiberglass PCB material (1.6-mm thickness) may be employed. For maximum
performance, RF quality substrate material should be used.
SUPPLY DECOUPLING
Positive supply connections for the WE904/905 are nominally 2.7V to 3.3V. All supply pins must be
bypassed to an RF, Analog, or Digital ground plane depending upon the type of supply pin. For RF
supply pins, a 100 pF ceramic capacitor in parallel with a 1.0 nF ceramic capacitor, both RF quality,
should provide adequate decoupling. For analog and digital supply pins, 0.01-0.1 F RF quality
capacitors should be used. The bypass capacitors should be placed as close to all power supply pins as
possible. An effort should be made to minimize the trace length between the capacitor leads and the
respective WE904/905 power supply and common pins.
GROUNDING
The circuit designer should attempt to locate WE904/905, its associated analog input circuitry and
interconnections, as far as possible from logic circuitry. A solid RF analog ground should be placed
around the LNA and associated RF filter circuitry, while a solid digital ground should be placed around
the reference oscillator. Analog signals should be routed as far as possible from digital signals and
should cross them at right angles.
Connect all ground pins together to a low impedance ground plane, as close to the device as possible.
Observe proper RF grounding and shielding techniques. The WE904/905 should be used with separate
analog and digital ground planes. The digital and analog ground planes should be "summed" at one
point, typically at the power supply filter capacitor.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| WE905 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.1 - 1GHx Single Chip FM Transceiver |
| WE9104 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9110 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9140 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
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