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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)： | 55/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 55 of 89
Crystal Oscillator
An external clock signal or the internal
crystal oscillator can be used as main
frequency
reference.
frequency must be 16 MHz. Because the
crystal frequency is used as reference for
the data rate as well as other internal
signal
processing
frequencies cannot be used.
The
reference
functions,
other
If an external clock signal is used this
should be connected to
XOSC16_Q1
, while
XOSC16_Q2
should be left open. The
MAIN.XOSC16M_BYPASS
bit must be set
when an external clock signal is used.
Using the internal crystal oscillator, the
crystal must be connected between the
XOSC16_Q1
and
XOSC16_Q2
pins. The
oscillator is designed for parallel mode
operation of the crystal. In addition,
loading capacitors (C
381
and C
391
) for the
crystal are required. The loading capacitor
values
depend
on
capacitance, C
L
, specified for the crystal.
The total load capacitance seen between
the crystal terminals should equal C
L
for
the crystal to oscillate at the specified
frequency.
the
total
load
parasitic
L
C
C
C
C
+
+
=
391
381
1
1
1
The parasitic capacitance is constituted by
pin input capacitance and PCB stray
capacitance.
The
capacitance is typically 5 pF. A trimming
capacitor may be placed across C
381
for
initial tuning if necessary.
total
parasitic
The crystal oscillator circuit is shown in
Figure 28. Typical component values for
different values of C
L
are given in Table
10.
The
regulated. This means that a high current
is used to start up the oscillations. When
the amplitude builds up, the current is
reduced to what is necessary to maintain
a stable oscillation. This ensures a fast
start-up and keeps the drive level to a
minimum. The ESR of the crystal must be
within the specification in order to ensure
a reliable start-up (see the Electrical
Specifications section).
crystal
oscillator
is
amplitude
C381
C391
XTAL
XOSC16_Q1
XOSC16_Q2
Figure 28. Crystal oscillator circuit
Item
C
L
= 12 pF
C
L
= 16 pF
C
L
= 22 pF
C6
6.8 pF
18 pF
27 pF
C7
6.8 pF
18 pF
27 pF
Table 10. Crystal oscillator component values
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