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参数资料
| 型号： | SX1223SK915 |
| 厂商： | Semtech |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER FOR XE1223 915MHZ |
| 产品培训模块： | SX1223 ISM Transmitter |
| 标准包装： | 1 |
| 类型： | 发射器，UHF |
| 频率： | 915MHz |
| 适用于相关产品： | XE1223（915MHz） |
| 已供物品： | 2 个板，2 个模块，2 根天线，线缆，文档 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
SX1223
Add Bits
3 7-3
Add Bits
3 2-0
MOD_I
1..31
MOD_A
Comments
The deviation frequency is linearly dependent of MOD_I
Table 23: Modulator current setting for frequency deviation
Comments
Frequency deviation attenuator (or range selector). The attenuations are
0..4
(values 0 through 4, respectively)
1 , 1 , 1 , 1 , and 1
1 2 4 8 16
.
Table 24: Modulator attenuator setting for frequency deviation
Add Bits
4 5-3
Add Bits
4 2-0
BRn
0..5
MOD_F
0..3
Comments
The bit rate clock is set by dividing the crystal oscillator frequency by
RefClk_K*2^(3+BRn)
Table 25: Bit Rate setting
Comments
Programmable smoothing filter after attenuator. This can be programmed in
four steps, and will produce reasonable results for the highest bit rates.
Table 26: Modulator filter setting
Add Bits
RefClk_K Comments
5 5-0
1..63
The crystal oscillator is divided by this number to produce modulator clock and
it is divided further down by 2^(3+BRn) to produce the bit rate clock.
Table 27: Modulator and Bit Rate clock setting
Add
16
Bit
4
Prescal_s
0
State
(default)
Comments
Reserved.
1
Prescaler enabled
f RF
=
f XCO
M ? ( 2 ? FreqBand )
( 16 ? N + A )
Table 28: Prescaler enable bit
“1” should be written in Prescal_s register to operate SX1223 PLL dividers.
5.2.3 Optional and Test Parameters
In most applications, the user has only to be concerned with the parameters given in sections 5.2.1 and 5.2.2.
However some options and test modes are available for special purposes. They are described in the tables below.
Add Bits
16 7-5
VCO_IB2
1
1
0
0
VCO_IB1
1
0
1
0
VCO_IB0
1
1
1
0
Comments - default = [0 0 1]
Bias setting for 850 MHz
Bias setting for 868 MHz
Bias setting for 915 MHz
Bias setting for 950 MHz
Table 29: VCO bias
The two VCO_freq bits have to be programmed by the user according to the selected frequency band, whereas the
three VCO_IB bits can be either forced by the user or set automatically by the circuit which will select the
combination having the best phase noise. This automatic setting can be enabled by setting the three VCO_IB bits to
‘0’.
? Semtech 2007
19
www.semtech.com
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