參數(shù)資料
型號(hào)： 1200
廠商： TEXAS INSTRUMENTS INC
元件分類： 無(wú)繩電話/電話
英文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20
封裝： 4 X 4 MM, ROHS COMPLIANT, QLP-20
文件頁(yè)數(shù)： 31/70頁(yè)
文件大?。?/td> 841K
代理商： 1200
Chipcon
SmartRF CC1100
Chipcon AS
SmartRF
CC1100 Preliminary Data Sheet (rev. 1.0) 2005-04-25
Page 37 of 68
315MHz
433MHz
868MHz
915MHz
Output
power
[dBm]
Setting
Current
consumption,
typ. [mA]
Setting
Current
consumption,
typ. [mA]
Setting
Current
consumption,
typ. [mA]
Setting
Current
consumption,
typ. [mA]
-30
0x04
10.9
0x68
11.7
0x03
12.0
0x11
11.9
-20
0x17
11.5
0x6C
12.2
0x0D
12.6
0x0B
12.4
-15
0x1D
12.2
0x1C
12.8
0x1C
13.2
0x1B
13.1
-10
0x26
13.4
0x06
14.3
0x34
14.6
0x6D
13.7
-5
0x69
13.0
0x3A
13.8
0x67
14.4
0x67
14.2
0
0x51
15.1
0x51
16.1
0x60
16.8
0x50
16.5
5
0x86
18.3
0x85
19.3
0x85
19.9
0x85
19.3
7
0xCC
22.2
0xC8
24.0
0xCC
25.6
0xC9
25.6
10
0xC3
26.9
0xC0
28.8
0xC3
30.3
0xC1
30.2
Table 24: Optimum PATABLE settings for various output power levels and frequency bands
315MHz
433MHz
868MHz
915MHz
Default
power
setting
Output
power
[dBm]
Current
consumption,
typ. [mA]
Output
power
[dBm]
Current
consumption,
typ. [mA]
Output
power
[dBm]
Current
consumption,
typ. [mA]
Output
power
[dBm]
Current
consumption,
typ. [mA]
0xC6
8.9
25.1
7.8
25.0
8.9
28.3
8.1
26.8
Table 25: Output power and current consumption for default PATABLE setting
33 Crystal Oscillator
A crystal in the frequency range 26MHz-
27MHz must be connected between the
XOSC_Q1 and XOSC_Q2 pins. The oscillator
is designed for parallel mode operation of the
crystal. In addition, loading capacitors (C81
and C101) for the crystal are required. The
loading capacitor values depend on the total
load capacitance, CL, specified for the crystal.
The total load capacitance seen between the
crystal terminals should equal CL for the
crystal to oscillate at the specified frequency.
parasitic
L
C
+
=
101
81
1
The parasitic capacitance is constituted by pin
input capacitance and PCB stray capacitance.
Total parasitic capacitance is typically 2.5pF.
The crystal oscillator circuit is shown in Figure
16. Typical component values for different
values of CL are given in Table 26.
The crystal oscillator is amplitude 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 approximately 0.4Vpp signal
swing. This ensures a fast start-up, and keeps
the drive level to a minimum. The ESR of the
crystal should be within the specification in
order to ensure a reliable start-up (see section
7 on page 9).
The initial tolerance, temperature drift, aging
and load pulling should be carefully specified
in order to meet the required frequency
accuracy in a certain application. By specifying
the total expected frequency accuracy in
SmartRF
Studio together with data rate and
frequency deviation, the software calculates
the total bandwidth and compares this to the
chosen receiver channel filter bandwidth. The
software reports any contradictions, and a
more accurate crystal is recommended if
required.
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