參數(shù)資料
型號(hào)： ADF7020BCP
廠商： ANALOG DEVICES INC
元件分類： 無(wú)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(yè)數(shù)： 20/40頁(yè)
文件大?。?/td> 797K
代理商： ADF7020BCP
ADF7020
Preliminary Technical Data
Maximum AFC Range
The maximum AFC frequency range is ±100 kHz. This is set by
the maximum IF filter bandwidth of 200 kHz. Using the
minimum IF filter bandwidth of 100 kHz, the AFC range is
±50 kHz.
Rev. PrH | Page 20 of 40
When AFC errors have been removed using either the internal
or external AFC, further improvement in the receiver’s sensi-
tivity can be obtained by reducing the IF filter bandwidth using
Bits R1_DB(22:23).
AUTOMATIC SYNC WORD RECOGNITION
The ADF7020 also supports automatic detection of the sync or
ID fields. To activate this mode, the sync (or ID) word must be
preprogrammed into the ADF7020. In receive mode, this
preprogrammed word is compared to the received bit stream
and, when a valid match is identified, the external pin
INT/LOCK is asserted by the ADF7020.
This feature can be used to alert the microprocessor that a valid
channel has been detected. It relaxes the computational
requirements of the microprocessor and reduces the overall
power consumption. The INT/LOCK is automatically de-
asserted again after nine data clock cycles.
The automatic sync/ID word detection feature is enabled by
selecting demod mode 2 or 3 in the demodulator setup register.
Do this by setting R4_DB(25:23) = [010] or [011]. Bits
R5_DB(4:5) are used to set the length of the sync/ID word,
which can be either 12, 16, 20, or 24 bits long. The transmitter
must transmit the MSB of the sync byte first and the LSB last to
ensure proper alignment in the receiver sync byte detection
hardware.
For systems using FEC, an error tolerance parameter can also be
programmed that accepts a valid match when up to three bits of
the word are incorrect. The error tolerance value is assigned in
R5_DB(6:7).
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