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參數(shù)資料
| 型號： | EVAL-ADF7012EB1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter |
| 中文描述： | 多通道ISM頻段FSK信號/的GFSK /元件Ook /約克/ ASK發(fā)射 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 772K |
| 代理商： | EVAL-ADF7012EB1 |
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ADF7012
315 MHZ OPERATION
The recommendations here are guidelines only. The design
should be subject to internal testing prior to FCC site testing.
Matching components need to be adjusted for board layout.
Rev. 0 | Page 20 of 28
The FCC standard 15.231 regulates operation in the band
from 260MHz to 470MHz in the US. This is used generally in
the transmission of RF control signals, such as in a satellite-
decoder remote control, or remote keyless entry system. The
band cannot be used to send any continuous signal. The
maximum output power allowed is governed by the duty cycle
of the system. A typical design example for a remote control is
shown next.
Design Criteria
315 MHz center frequency
FSK/OOK modulation
1 mW output power
House range
Meets FCC 15.231
The main requirements in the design of this remote are a long
battery life and sufficient range. It is possible to adjust the
output power of the ADF7012 to increase the range depending
on the antenna performance.
The center frequency is 315 MHz. Because the ADF7012
VCO is not recommended for operation in fundamental mode
for frequencies below 400 MHz, the VCO needs to operate at
630 MHz. Figure 36 (Output Frequency vs. External Inductor
Value) implies an inductor value of 7.6 nH or close to this. The
chip inductor chosen = 7.5 nH (0402CS-7N5 from Coilcraft).
Coil inductors are recommended to provide sufficient Q for
oscillation.
Crystal and PFD
Phase noise requirements are not excessive as the adjacent
channel power requirement is 20 dB. The PFD is chosen so as
to minimize spurious levels (beat note and reference), and to
ensure a quick crystal power-up time.
PFD = 3.6864 MHz Power-Up Time 1.6ms. Figure 10 shows a
typical power-on time for a 4 MHz crystal.
N-Divider
The N Divider is determined as being:
Nint = 85
Nfrac = (1850)/4096
VCO divide-by-2 is enabled
Deviation
The deviation is set to ± 50 kHz so as to accommodate a simple
receiver architecture.
The modulation steps available are in 3.6864 MHz/2
14
:
Modulation steps = 225 Hz
Modulation number = 50 kHz/225 Hz = 222
Bias Current
Because low current is desired, a 2.0 mA VCO bias can be used.
Additional bias current reduces any spur, but increases current
consumption.
The PA bias can be set to 5.5 mA and achieve 0 dBm.
Loop Filter Bandwidth
The loop filter is designed with ADIsimPLL Version 2.5. The
loop bandwidth design is straightforward because the 20 dB
bandwidth is generally of the order of >400 kHz (0.25% of
center frequency). A loop bandwidth of close to 100 kHz strikes
a good balance between lock time and spurious suppression. If
it is found that pulling of the VCO is more than desired in OOK
mode, the bandwidth could be increased.
Design of Harmonic Filter
The main requirement of the harmonic filter should ensure that
the third harmonic level is < 41.5 dBm. A fifth-order
Chebyshev filter is recommended to achieve this, and a
suggested starting point is given next. The Pi format is chosen
to minimize the more expensive inductors.
Component Values—Crystal: 3.6864MHz
Loop Filter
I
CP
0.866 mA
LBW
100 kHz
C1
680 pF
C2
12 nF
C3
220 pF
R1
1.1 kV
R2
3 kV
Matching
L1
56 nH
L2
1 nF
C14
Short
C15
Open
Harmonic Filter
L4
22 nH
L5
22 nH
CF1
3.3 pF
CF2
8.2 pF
CF3
3.3 pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADF7012EB2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter |
| EVAL-ADF7012EB3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter |
| EVAL-ADF7012EB4 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter |
| EVAL-ADF7012EB5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multichannel ISM Band FSK/GFSK/OOK/GOOK/ASK Transmitter |
| EVAL-ADF7020-1DBZ4 | 功能描述:BOARD EVAL ADF7020-1 405-435MHZ RoHS:是 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
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