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參數(shù)資料
| 型號： | RF2945 |
| 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 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 742K |
| 代理商： | RF2945 |
11-224
RF2945
Rev A10 000919
11
T
PLL Synthesizer
The RF2945 evaluation board uses an LMX2316 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 RF2945 is controlled by RX ENABL and TX
ENABL which are decoded to put the RF2945 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 RF2945, first put the RF2945 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.
For applications requiring fast switching speeds or
turn-on times, and low data rate loop filter bandwidths,
the LMX2316 may be configured to drive the loop filter
in a fast switching mode. Please refer to literature on
the LMX2316 for more information.
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