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參數(shù)資料
| 型號： | RXC101 |
| 廠商： | RF Monolithics, Inc. |
| 英文描述： | Multi-channel High data rate Programmable |
| 中文描述： | 多通道可編程數(shù)據(jù)率高 |
| 文件頁數(shù)： | 14/33頁 |
| 文件大小： | 546K |
| 代理商： | RXC101 |
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14
The analog RSSI is available through and external pin (15). This pin requires an external capacitor which
sets the settling time. The analog RSSI may be used to recover ASK modulated data at a low rate on the
order of a few thousand bits per sec. The external capacitor value will control the received ASK data rate
allowed so choosing a lower value capacitor enables recovery of faster data at the expense of amplitude.
Using pin (15) with a sensitive comparator will yield good results.
Automatic Frequency Adjustment (AFA)
The PLL has the capability to do fine adjustment of the carrier frequency automatically. In this way, the
receiver can minimize the offset between the transmit and receive frequency. This function may be
enabled or disabled through the
Automatic Frequency Adjustment Register
. The range of offset can be
programmed as well as the offset value calculated and added to the frequency control word within the
PLL to incrementally change the carrier frequency. The chip can be programmed to automatically
perform an adjustment or may be manually activated by a strobe signal. This function has the advantage
of allowing:
Cheaper, lower accuracy crystals to be used
Increased receiver sensitivity by narrowing the receive bandwidth
Achieving higher data rates
Crystal Oscillator
The RXC101 incorporates an internal crystal oscillator circuit that provides a 10MHz reference, as well as
internal load capacitors. This significantly reduces the component count required. The internal load
capacitance is programmable from 8.5pF to 16pF in 0.5pF steps. This has the advantage of accepting a
wide range of crystals from many different manufacturers having different load capacitance requirements.
Being able to vary the load capacitance also helps with fine tuning the final carrier frequency since the
crystal is the PLL reference for the carrier. When the shunt capacitance, Co, is worst case 7pF and the
ESR is 300 Ohms max, the oscillator can be expected to meet the start-up times as defined in the AC
Characteristics. Crystals with less than 7pF shunt capacitance and lower ESR guarantee much faster
start-up times.
An external clock signal is also provided that may be used to run an external processor. This also has
the advantage of reducing component count by eliminating an additional crystal for the host processor.
The clock frequency is also programmable from eight pre-defined frequencies, each a pre-scaled value of
the 10MHz crystal reference. These values are programmable through the
Battery Detect Threshold and
Clock Output Register.
The internal clock oscillator may be disabled which also disables the output clock
signal to the host processor. When the oscillator is disabled, the chip provides an additional 196 clock
cycles before releasing the output, which may be used by the host processor to setup any functions
before going to sleep.
Frequency Control (PLL) and Frequency Synthesizer
The PLL synthesizer is the heart of the operating frequency. It is programmable and completely
integrated, providing all functions required to generate the carriers and tunability for each band. The PLL
requires only a single 10MHz crystal reference source. RF stability is controlled by choosing a crystal
with the particular specifications to satisfy the application. This gives the designer the maximum flexibility
in performance.
The PLL is able to perform manual and automatic calibration to compensate for changes in temperature
or operating voltage. When changing band frequencies, re-calibration must be performed. This can be
done by disabling the synthesizer and re-enabling again through the
Power Management Register
.
Registers common to the PLL are:
Power Management Register
Configuration Register
Frequency Setting Register
Automatic Frequency Adjust Register
Transmit Configuration Register
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| RXC101M2DBK-1625P | 功能描述:鋁質(zhì)電解電容器 - 帶引線 200V 100uF 20% RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
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