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參數(shù)資料
| 型號(hào)： | RF2915 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 433/868/915MHZ FSK/ASK/OOK TRANSCEIVER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 MM, PLASTIC, LQFP-32 |
| 文件頁(yè)數(shù)： | 10/18頁(yè) |
| 文件大小： | 386K |
| 代理商： | RF2915 |
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11-120
RF2915
Rev A7 001011
11
T
The quad tank of the discriminator may be imple-
mented with ceramic discriminator available from a
couple of sources. This design works well for wideband
applications where temperature range is limited. The
temperature coefficient of ceramic discriminators may
be in the order of +50ppm/°C. The alternative to the
ceramic discriminator is the LC tank, which provides a
broadband discriminator more useful for high data
rates.
PLL Synthesizer
The RF2915 evaluation board uses an LMX2315 PLL
IC from National Semiconductor. This PLL IC may be
programmed from the software available from National
Semiconductor
(codeloader
appinfo/wireless/). An external reference oscillator is
required for the PLL IC allowing for the evaluation of
different reference frequencies or step sizes. The
National Semiconductor software also has a calculator
for determining the R and C component values for a
given loop bandwidth.
at
www.national.com/
The RF2915 is controlled by RX ENABL and TX
ENABL which are decoded to put the RF2915 into one
of four states. It may be put into a PLL-only mode with
TX ENABL and RX ENABL both high. This condition is
used to provide time for the synthesizer to turn on and
obtain lock before turning on the receiver or transmit-
ter. Note that LVL ADJ needs to be held low for PLL-
only mode. Sometimes, it is desirable to ramp up the
power amplifier to minimize load pulling on the VCO.
To do this with the RF2915, first put the RF2915 into
PLL mode by putting TX ENABL and RX ENABL high.
Then, ramp up LVL ADJ to turn on the transmitter and
PA. The rate at which LVL ADJ is allowed to ramp up is
dependent on the PLL loop bandwidth. VCC pushing
also affects the VCO frequency. A good low pass filter
on VCC will minimize the VCC pushing effects.
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PDF描述 |
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| RF2917 | 433/868/915MHZ FM/FSK RECEIVER |
| RF2919 | 433/868/915MHZ ASK/OOK RECEIVER |
| RF2926 | UHF DUAL CONVERSION TRANSCEIVER |
| RF2938 | 2.4GHZ SPREAD-SPECTRUM TRANSCEIVER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RF2917 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:433/868/915MHZ FM/FSK RECEIVER |
| RF2919 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:433/868/915MHZ ASK/OOK RECEIVER |
| RF2926 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:UHF DUAL CONVERSION TRANSCEIVER |
| RF2926-000 | 制造商:TE Connectivity 功能描述:FEMTOSMDC005F-2 - Tape and Reel |
| RF2926PCBA | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:UHF DUAL CONVERSION TRANSCEIVER |
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