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| 型号： | TRM-433-LT |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 16/44页 |
| 文件大小： | 0K |
| 描述： | TRANSCEIVER RF 433MHZ LT SERIES |
| 产品目录绘图： | TRM-433-LT Top TRM-433-LT Side |
| 特色产品： | LT Series Long-Range RF Transceiver Modules |
| 标准包装： | 34 |
| 系列： | LT |
| 频率： | 433MHz |
| 数据传输率 - 最大： | 10kbps |
| 调制或协议： | AM，OOK |
| 应用： | 双向传呼，ISM，机器人，遥测 |
| 功率 - 输出： | 10dBm |
| 灵敏度： | -112dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 6.1mA |
| 电流 - 传输： | 12mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 表面安装 |
| 包装： | 管件 |
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50 ? RF IN
(Antenna)
Band Select
Filter
LNA
0°
∑
10.7MHz
IF Filter
Limiter
-
+
Data Slicer
RX Data
90°
RSSI
Analog
A REF
GND
PA
RX VCO
TX VCO
PLL
Digital
Logic
PDN
T/R SEL
DATA
XTAL
Figure 20: LT Series Transceiver Block Diagram
Theory of Operation
The LT Series transceiver sends and recovers
data by AM or Carrier-Present Carrier-Absent
(CPCA) modulation, also referred to as On-Off
Keying (OOK). This type of modulation
represents a logic low ‘0’ by the absence of
a carrier and a logic high ‘1’ by the presence
Figure 21: CPCA (AM) Modulation
of a carrier. This method affords numerous
benefits. The two most important are: 1) cost-effectiveness due to design
simplicity and 2) higher legally-allowable output power and thus greater
range in countries (such as the US) that average output power
measurements over time.
The LT’s receiver chain utilizes an advanced synthesized superheterodyne
architecture and achieves exceptional sensitivity. Transmitted signals
enter the module through a 50-ohm RF port intended for single-ended
connection to an external antenna. RF signals entering the antenna are
filtered and then amplified by an NMOS cascode Low Noise Amplifier
(LNA). The signal is then down-converted to a 10.7MHz Intermediate
Frequency (IF) by mixing it with a low-side Local Oscillator (LO). The LO
frequency is generated by a Voltage Controlled Oscillator (VCO) which is
locked by a Phase-Locked Loop (PLL) frequency synthesizer referenced
to a precision crystal. The mixer stage is a pair of double-balanced mixers
and a unique image rejection circuit, which greatly reduces susceptibility to
interference. The IF frequency is further amplified, filtered, and demodulated
to recover the original signal. The signal is squared by a data slicer and
output on the DATA line.
The LT’s transmitter chain is designed to generate up to 10mW of output
power into a 50-ohm single-ended antenna while suppressing harmonics
– 12 –
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