參數(shù)資料
型號(hào)： EM2420TR
廠商： Electronic Theatre Controls, Inc.
英文描述： 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
中文描述： 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器
文件頁(yè)數(shù)： 51/89頁(yè)
文件大?。?/td> 1758K
代理商： EM2420TR
EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 51 of 89
Frequency and Channel Programming
The operating frequency is set by
programming the 10 bit frequency word
located in
FSCTRL.FREQ[9:0]
. The
operating frequency F
C
in MHz is given by:
F
C
= 2048 +
FSCTRL.FREQ[9:0]
MHz
In receive mode the actual LO frequency
is F
C
– 2 MHz, since a 2 MHz IF is used.
Direct conversion is used for transmission,
so here the LO frequency equals F
C
. The
2 MHz IF is automatically set by the
EM2420
, so the frequency programming is
equal for RX and TX.
IEEE 802.15.4 specifies 16 channels
within the 2.4 GHz band, numbered 11
through 26. The RF frequency of channel
k is given by [1]:
F
C
= 2405 + 5 (k-11) MHz, k=11, 12, ..., 26
For
FSCTRL.FREQ
register should therefore
be set to:
operation
in
channel
k,
the
FSCTRL.FREQ
= 357 + 5 (k-11)
VCO and PLL Self-Calibration
VCO
The VCO is completely integrated and
operates at 4800 – 4966 MHz. The VCO
frequency is divided by 2 to generate
frequencies in the desired band (2400-
2483.5 MHz).
PLL self-calibration
The VCO's characteristics will vary with
temperature, changes in supply voltages,
and the desired operating frequency.
In order to ensure reliable operation the
VCO’s bias current and tuning range are
automatically calibrated every time the RX
mode or TX mode is enabled, i.e. in the
RX_CALIBRATE, TX_CALIBRATE and
TX_ACK_CALIBRATE control states in
Figure 23 on page 43.
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