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參數(shù)資料
| 型號： | 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標準/ ZigBee的射頻收發(fā)器 |
| 文件頁數(shù)： | 48/89頁 |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 48 of 89
Linear IF and AGC Settings
The
EM2420
is based on a linear IF chain
where the signal amplification is done in
an analog VGA (variable gain amplifier).
The gain of the VGA is digitally controlled.
The AGC (Automatic Gain Control) loop
ensures that the ADC operates inside its
dynamic range by using an analog/digital
feedback loop.
The AGC characteristics are set through
the
AGCCTRL
,
AGCTST0
,
AGCTST1
and
AGCTST2
registers. The reset values
should be used for all AGC control and
test registers.
RSSI / Energy Detection
The
EM2420
has a built-in RSSI (Received
Signal Strength Indicator) giving a digital
value that can be read from the 8 bit,
signed 2’s complement RSSI.RSSI
_VAL
register.
The RSSI value is always averaged over 8
symbol periods (128
μ
s), in accordance
with [1]. The
RSSI_VALID
status bit
(Table 5) indicates when the RSSI value is
valid, meaning that the receiver has been
enabled for at least 8 symbol periods.
The RSSI register value
RSSI.RSSI_VAL
can be referred to the power P at the RF
pins by using the following equations:
P =
RSSI_VAL
+
RSSI_OFFSET
[dBm]
where
empirically during system development
from the front end gain.
RSSI_OFFSET
is
approximately –45. E.g. if reading a value
of –20 from the
RSSI
register, the RF
input power is approximately –65 dBm.
the
RSSI_OFFSET
is
found
A typical plot of the
RSSI_VAL
reading as
function of input power is shown in Figure
25. It can be seen from the figure that the
RSSI reading from the
EM2420
is very
linear and has a dynamic range of about
100 dB.
-60
-40
-20
0
20
40
60
-100
-80
-60
-40
-20
0
RF Level [dBm]
R
Figure 25. Typical RSSI value vs. input power
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