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參數(shù)資料
| 型號(hào)： | EVAL-ADF7012EB2 |
| 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(hào)/的GFSK /元件Ook /約克/ ASK發(fā)射 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 772K |
| 代理商： | EVAL-ADF7012EB2 |
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ADF7012
Setting Tuning Sensitivity Value
The tuning sensitivity or kV is usually denoted in MHz/V and is
required for the loop filter design. It refers to the amount that a
change of a volt in the voltage applied to VCO
IN
pin, changes
the output frequency. Typical data for the ADF7012 over a
frequency range is shown.
Rev. 0 | Page 18 of 28
FREQUENCY (MHz)
K
V
120
100
60
80
40
20
0
200
400
300
600
500
800
900
1000
700
1100
0
Figure 37. kV vs. VCO Frequency
Charge-Pump Current
The charge-pump current allows the loop filter bandwidth to be
changed using the registers. The loop bandwidth reduces as the
charge pump current is reduced and vice versa.
Selecting Loop Filter Bandwidth
Data Rate
The loop filter bandwidth should usually be at two to three
times the data rate. This ensures that the PLL has ample time
to jump between the mark and space frequencies.
ACP
In the case where the ACP specifications are difficult to meet,
the loop filter bandwidth can be reduced further to reduce the
phase noise at the adjacent channel. The filter rolls off at 20 dB
per decade.
Spurious Levels
In the case where the output power is quite high, a reduced loop
filter bandwidth reduces the spurious levels even further, and
provides additional margin on the specification.
The following sections provide examples of loop filter designs
for typical applications in specific frequencies.
PA MATCHING
The ADF7012 exhibits optimum performance in terms of
transmit power and current consumption only if the RF output
port is properly matched to the antenna impedance.
ZOPT_PA depends primarily on the required output power,
and the frequency range. Selecting the optimum ZOPT_PA
helps to minimize the current consumption. This data sheet
contains a number of matching networks for common
frequency bands. Under certain conditions it is recommended
to obtain a suitable ZOPT_PA value by means of a load-pull
measurement.
ANTENNA
LPF
RF
OUT
ZOPT_PA
PA
DV
DD
0
Figure 38. ADF7012 with Harmonic Filter
The impedance matching values provided in the next section
are for 50 environments. An additional matching network
may be required after the harmonic filter to match to the
antenna impedance. This can be incorporated into the filter
design itself in order to reduce external components.
TRANSMIT PROTOCOL AND CODING
CONSIDERATIONS
0
PREAMBLE
SYNC
WORD
ID
FIELD
DATA FIELD
CRC
Figure 39. Typical Format of a Transmit Protocol
A dc-free preamble pattern such as 10101010… is recom-
mended for FSK/ASK/OOK demodulation. Preamble patterns
with longer run-length constraints such as 11001100…. can also
be used. However, this can result in a longer synchronization
time of the received bit stream in the chosen receiver.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(píng)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 |
| EVAL-ADF7020-1DBZ5 | 功能描述:BOARD EVAL ADF7020-2 ADJ FREQ RoHS:是 類別:RF/IF 和 RFID >> RF 評(píng)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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