SI4012 查看數據表（PDF） - Silicon Laboratories
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SI4012 Datasheet PDF : 50 Pages
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3. Functional Description
Host
MCU
LED
XTAL
Digital Logic
Antenna Tune
SMBus
Interface
OOK
FSK
Modulator
Digital
Controller
TX
255 Byte
Data FIFO
Register
Bank
Si4012
Si4012
RF Analog Core
Divider
PA
LCOSC
Auto
TXP
Tune
TXM
LPOSC
XTAL
OSC
VA
LDO
VDD
POR
VD
BANDGAP
GND
Battery
Monitor
Figure 1. Si4012 Functional Block Diagram
The Si4012 is a fully-integrated, crystal-less, sub-GHz CMOS RF transmitter offering industry-leading RF
performance, high integration, flexibility, low BOM, small board area, and ease of design.
The device is designed to operate with any host MCU via a serial interface while optimized for battery-powered
applications. The Si4012 operates from voltages ranging from 1.8 to 3.6 V and offers an ultra-low standby current
consumption of less than 10 nA.
The embedded power amplifier can be programmed to supply from –13 dBm up to +10 dBm, while the patented
automatic antenna tuning circuit ensures that the resonant frequency and impedance matching between the PA
output and the connected antenna are configured for optimum transmit efficiency and low harmonic content.
Users may configure the device for either FSK or OOK modulation with supported symbol rates of up to 100 kbps.
To ensure the lowest system cost, the Si4012 can be used without an external crystal or frequency reference by
leveraging Silicon Labs' patented and proven crystal-less oscillator technology. This technology offers better than
±150 ppm carrier frequency stability over the temperature range of 0 to +70 °C and ±250 ppm carrier frequency
stability over the industrial temperature range of –40 to + 85 °C. No production alignments are necessary since all
RF functions are integrated into the device.
Rev 1.1
9
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