datasheetbank_Logo
数据手册搜索引擎和 Datasheet免费下载 PDF

SX1242 查看數據表(PDF) - Semtech Corporation

零件编号
产品描述 (功能)
比赛名单
SX1242 Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
ADVANCED COMMUNICATIONS & SENSING
SX1242
Integrated Transmitter IC
DATASHEET
3. Circuit Description
The SX1242 compromises a low-consumption fractional-N Sigma-Delta type PLL and power amplifier.
A simplified block diagram of the internal architecture and application schematic is illustrated below in Figure 3
GND
1
RFOUT
8
v
v
v
DATA
2
CP
VDD
M/N 7
GND
3
XTAL
4
TX ENABLE
PFD
6
VDD
ΣΔ
5
v
Figure 3. SX1242 Simplified Block Diagram and Application Schematic
3.1. PLL
The VCO operates at twice the RF channel frequency and is derived from a 26 MHz crystal oscillator reference
3.2. Transmitter
The Power Amplifier (PA) is connected to the RFOUT pin and delivers 12 dBm in a 50 ohm load. The bit stream to be
transmitted over the air is sent to the chip via the pin DATA. During modulation, the rising and falling transitions are
smoothed with a ramp-up/ramp-down time of typically 20 μs via the PA reference DAC.
3.3. SX1242 Operating Modes
The SX1242 operating modes are defined by the status of the pin TX ENABLE and are documented in Table 5.
SX1242, Rev 1, November 2010
©2010 Semtech Corp.
Page 7
www.semtech.com

Share Link: 

datasheetbank.com [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]