SI4313-B1-FM Silicon Laboratories Inc, SI4313-B1-FM Datasheet - Page 26
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SI4313-B1-FM
Manufacturer Part Number
SI4313-B1-FM
Description
IC RX FSK 315-915MHZ 20VQFN
Manufacturer
Silicon Laboratories Inc
Series
EZRadio®r
Type
ISM Receiverr
Specifications of SI4313-B1-FM
Package / Case
20-VQFN
Mfg Application Notes
Si4313 Register Desc AppNote
Frequency
315MHz, 434MHz, 868MHz, 915MHz
Sensitivity
-118dBm
Data Rate - Maximum
128kbps
Modulation Or Protocol
FSK, GFSK, OOK
Applications
Data Logging, Health Monitors, Remote Control, Weather Station
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
1.8 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Operating Frequency
315 MHz to 915 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Current
100 nA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Memory Size
-
Current - Receiving
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1980-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SI4313-B1-FMR
Manufacturer:
TI
Quantity:
10 000
Part Number:
SI4313-B1-FMR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Si4313-B1
5. Internal Functional Blocks
This section provides an overview of some of the key blocks of the internal radio architecture.
5.1. RX LNA
The input frequency range for the LNA is 240–960 MHz. The LNA provides gain with a noise figure low enough to
suppress the noise of the following stages. The LNA has one step of gain control that is controlled by the analog
gain control (AGC) algorithm. The AGC algorithm adjusts the gain of the LNA and PGA so the receiver can handle
signal levels from sensitivity to +5 dBm with optimal performance.
5.2. RX I-Q Mixer
The output of the LNA is fed internally to the input of the receive mixer. The receive mixer is implemented as an I-Q
mixer that provides both I and Q channel outputs to the programmable gain amplifier. The mixer consists of two
double-balanced mixers whose RF inputs are driven in parallel. Local oscillator (LO) inputs are driven in
quadrature, and separate I and Q Intermediate Frequency (IF) outputs drive the programmable gain amplifier. The
receive LO signal is supplied by an integrated VCO and PLL synthesizer operating between 240 and 960 MHz.
The necessary quadrature LO signals are derived from the divider at the VCO output.
5.3. Programmable Gain Amplifier
The Programmable Gain Amplifier (PGA) provides the necessary gain to boost the signal level into the dynamic
range of the ADC. The PGA must also have enough gain switching to allow for large input signals to ensure a
linear RSSI range up to –20 dBm. The PGA has steps of 3 dB that are controlled by the AGC algorithm in the
digital modem.
5.4. ADC
The amplified IQ IF signals are digitized using an Analog-to-Digital Converter (ADC), which allows for low current
consumption and high dynamic range. The band-pass response of the ADC provides exceptional rejection of out of
band blockers.
5.5. Digital Modem
Using high-performance ADCs allows channel filtering, image rejection, and demodulation to be performed in the
digital domain, resulting in reduced area while increasing flexibility. The digital modem performs the following
functions:
The digital channel filter and demodulator are optimized for ultra low power consumption and are highly
configurable. Supported modulation types are GFSK, FSK, and OOK. The channel filter can be configured to
support bandwidths ranging from 620 kHz down to 2.6 kHz. A large variety of data rates are supported ranging
from 0.123 up to 256 kbps. The AGC algorithm is implemented digitally using an advanced control loop optimized
for fast response time.
The configurable preamble detector is used to improve the reliability of the sync-word detection. The sync-word
detector is only enabled when a valid preamble is detected, significantly reducing the probability of false detection.
The received signal strength indicator (RSSI) provides a measure of the signal strength received on the tuned
channel. The resolution of the RSSI is 0.5 dB. This high resolution RSSI enables accurate channel power
measurements for clear channel assessment (CCA), and carrier sense (CS), and listen before talk (LBT)
functionality.
26
Channel selection filter
TX modulation
RX demodulation
AGC
Preamble detector
Invalid preamble detector
Radio signal strength indicator (RSSI)
Automatic frequency compensation (AFC)
Rev. 1.0