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| 型号： | SM1230E868 |
| 厂商： | Semtech |
| 文件页数： | 12/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL XMITTER FOR SX1230 |
| 设计资源： | SM1230 BOM SX1230 Eval Board Schematic |
| 标准包装： | 1 |
| 类型： | 发射器 |
| 频率： | 868MHz |
| 适用于相关产品： | SX1230 |
| 已供物品： | 板 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
freq_rf(23:0) ? f XOSC
f XOSC ? df_coeff(13:0)
Δ f = ------------------------------------------------------
2
R B = ---------------------------------
5. Operation of the SX1230
The SX1230 is an integrated ISM band transmitter and features a fully integrated frequency synthesizer, modulator and
power amplifier. This section describes the operation of the SX1230 and the functionality of these blocks.
5.1. Main Parameters
5.1.1. Center Frequency
The carrier output center frequency, f RF , of the SX1230 is programmable via the SPI interface. It is determined by the
following equation:
19
f RF = --------------------------------------------------
2
where freq_rf(23:0) is the decimal value of the 24 bit number stored in configuration registers FrfMsb, FrfMid and FrfLsb
and f XOSC is the frequency of the crystal oscillator. If the optimal value of 32 MHz is selected for the crystal oscillator, then
this results in a programmable frequency resolution of 61.035 Hz.
Note that RF output frequencies are only valid in the bands 290-340 MHz, 431-510 MHz and 862-1020 MHz. Note also,
that for ease of use, the band selection process is performed automatically.
5.1.2. Frequency Deviation
The frequency deviation of the SX1230 in FSK mode is given by the following equation:
19
where df_coeff is the decimal value of the 14 bit contents of the FdevLsb and FdevMsb configuration registers.
5.1.3. Bit Rate
The bit rate (or, depending upon coding, the chip rate) of the SX1230 is given by the following equation:
f XOSC
br_ratio(15:0)
where f XOSC is the crystal oscillator frequency, br_ratio is the decimal value of the 16 bit contents of registers BrMsb and
BrLsb. Note that for OOK modulation the maximum bit rate is 32.7 kbps which corresponds to a br_ratio(15:0) of 979.
The table below gives examples of some of the standard data rates accessible with SX1230.
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 12
www.semtech.com
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