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參數資料
| 型號： | ADF7020BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | High Performance ISM Band FSK/ASK Transceiver IC |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, LFCSP-48 |
| 文件頁數： | 22/40頁 |
| 文件大?。?/td> | 797K |
| 代理商： | ADF7020BCP |
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ADF7020
Preliminary Technical Data
accurate electrical model for the PC board. In this context, the
use of a suitable CAD package is strongly recommended. To
avoid this effort, the reference design provided for the ADF7020
RF module can be used.
Rev. PrH | Page 22 of 40
As with the external Rx/Tx switch, an additional LPF or BPF
might be required to suppress harmonics in the transmit
spectrum or to improve the resilience of the receiver against
out-of-band interferers.
TRANSMIT PROTOCOL AND CODING
CONSIDERATIONS
0
PREAMBLE
SYNC
WORD
ID
FIELD
DATA FIELD
CRC
Figure 20. Typical Format of a Transmit Protocol
A dc-free preamble pattern is recommended for FSK/ASK/
OOK demodulation. The recommended preamble pattern is a
dc-free pattern such as a 10101010… pattern. Preamble patterns
with longer run-length constraints such as 11001100…. can also
be used. However, this results in a longer synchronization time
of the received bit stream in the receiver.
Manchester coding can be used for the entire transmit protocol.
However, the remaining fields that follow the preamble header
do not have to use dc-free coding. For these fields, the ADF7020
can accommodate coding schemes with a run-length of up to
6 bits without any performance degradation.
If longer run-length coding must be supported, the ADF7020
has several other features that can be activated. These involve a
range of programmable options that allow the envelope detector
output to be frozen after preamble acquisition.
IMAGE REJECTION CALIBRATION
The image channel in this receiver, with an IF at 200 kHz, is at
200 kHz or +400 kHz below the desired signal. The polyphase
filter rejects this image with an asymmetric frequency response.
The image rejection performance of the receiver is dependent
on how well matched in amplitude the I and Q signals are, and
how perfect the quadrature is between them, that is, how close
to 90° apart they are. The uncalibrated image rejection perform-
ance is approximately 30 dB. However, it is possible to improve
on this performance by adjusting the I/Q phase/gain adjust bits
in Register 10, resulting in an image rejection of approximately
45 dB.
Bits R10_DB(24:27) adjust the relative phase of the signal
and Bits R10_DB(16:20) adjust the relative amplitude (see
Figure 20).
POLYPHASE
FILTER
LO Q
LO I
GAIN
PHASE
0
LNA
MIXERS
Figure 20. Phase/Gain Adjustment on ADF7020
DEVICE PROGRAMMING AFTER INITIAL
POWER-UP
Basic mode is the minimum number of write sequences to
power up the device. Enhanced mode uses the additional
features of the ADF7020 to tailor the part to a particular
application such as setting up a sync byte sequence or doing
automatic frequency control.
The sample setting is for the following setup:
FRF
= 915 MHz, FSK,
DR
= 9.868 kbps,
I
CP
= 1.44 mA
F
DEV
= 50 kHz,
XTAL
= 10 MHz, Correlator/Demodulator
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| ADF7020BCP-REEL | 制造商:Analog Devices 功能描述:RF TRNSCVR ASK/FSK 2.5V/3.3V 48LFCSP EP - Tape and Reel |
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| ADF7020BCP-U1 | 制造商:Analog Devices 功能描述:HIGH PERFORMANCE ISM BAND FSK/ASK TRANSCEIVER IC - Trays |
| ADF7020BCPZ | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數據傳輸率 - 最大:54Mbps 調制或協議:* 應用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
| ADF7020BCPZ-RL | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數據傳輸率 - 最大:54Mbps 調制或協議:* 應用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
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