SI4012 Silicon Laboratories, SI4012 Datasheet - Page 10

• Manufacturer Part Number: SI4012
• Description: CRYSTAL-LESS RF TRANSMITTER
• Manufacturer: Silicon Laboratories

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Si4012
2. Functional Description
The Si4012 is a crystal wireless transmitter with
continuous frequency tuning over the frequency range
of 27–960 MHz. The wide operating voltage range of
1.8–3.6 V and low current consumption makes the
Si4012
applications.
The RF carrier is generated by Silicon Labs patented
pending crystal-less oscillator technology. The device
achieves a frequency accuracy of ±150 ppm over the
commercial temperature range of 0 to 70 °C and
±250 ppm over the industrial temperature range of –40
to +85 °C.
10
GPIO0/XTAL
an
nIRQ
SDA
SDN
SCL
LED
ideal
Si4012
solution
CONTROLLER
INTERFACE
DIGITAL
SMBus
Figure 1. Si4012 Functional Block Diagram
for
DIGITAL LOGIC
battery
MODULATOR
DATA FIFO
REGISTER
256 BYTE
BANK
TX
ANTENNA
powered
TUNE
OOK
FSK
Rev 0.1
The Si4012's PA output power can be configured
between –13 to +10 dBm with 0.25 dB of resolution.
The PA incorporates automatic ramp-up and ramp-
down control to reduce unwanted spectral spreading.
The Si4012 is designed to work with a microcontroller to
allow custom configuration of the transmitter for
optimum performance. Voltage regulators are integrated
on-chip which allows for a wide operating supply voltage
range of 1.8 to 3.6 V. A standard 2-pin SMB (I
used to communicate with an external microcontroller.
LCOSC
DIVIDER
RF ANALOG CORE
LPOSC
XTAL
OSC
TMR
SLP
VA
VD
PA
BANDGAP
BATTERY
MONITOR
LDO
POR
AUTO
TUNE
2
TXP
TXM
VDD
GND
C) bus is
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