RFM12B_15 Datasheet, PDF (1/41 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

RFM12B
RFM12B Universal ISM
Band FSK Transceiver
DESCRIPTION
Hoperf’ RFM12B is a single chip, low power, multi-channel FSK
transceiver designed for use in applications requiring FCC or ETSI
conformance for unlicensed use in the 433, 868 and 915 MHz bands.
The RFM12B transceiver is a part of Hoperf’ EZRadio^TM product line,
which produces a flexible, low cost, and highly integrated solution that
does not require production alignments. The chip is a complete
analog RF and baseband transceiver including a multi-band PLL
synthesizer with PA, LNA, I/Q down converter mixers, baseband filters
and amplifiers, and an I/Q demodulator. All required RF functions are
integrated. Only an external crystal and bypass filtering are needed for
operation.
The RFM12B features a completely integrated PLL for easy RF
design, and its rapid settling time allows for fast frequency-hopping,
bypassing multipath fading and interference to achieve robust wireless
links. The PLL’s high resolution allows the usage of multiple channels
in any of the bands. The receiver baseband bandwidth (BW) is
programmable to accommodate various deviation, data rate and
crystal tolerance requirements. The transceiver employs the Zero-IF
approach with I/Q demodulation. Consequently, no external
components (except crystal and decoupling) are needed in most
applications.
The RFM12B dramatically reduces the load on the microcontroller with
the integrated digital data processing features: data filtering, clock
recovery, data pattern recognition, integrated FIFO and TX data
register. The automatic frequency control (AFC) feature allows the use
of a low accuracy (low cost) crystal. To minimize the system cost, the
RFM12B can provide a clock signal for the microcontroller, avoiding
the need for two crystals.
For low power applications, the RFM12B supports low duty cycle
operation based on the internal wake-up timer.
FUNCTIONAL BLOCK DIAGRAM
MIX
I
AMP OC
RF1 13
RF2 12
LNA
PA
RF Parts
MIX
Q
Self cal.
AMP OC
PLL & I/Q VCO
with cal.
RSSI
BB Amp/Filt./Limiter
I/Q
DEMOD
COMP
DQD
AFC
Data Filt
CLK Rec ^data
7 ^{DCLK /}
CFIL /
FFIT /
FSK /
6 _{DATA /}
nFFS
FIF O
Data processing units
CLK div
8
CLK
Xosc
9
XTL /
REF
W TM
LBD
with cal.
Low Power parts
Controller
Bi as
15
1
2
3
4
5
10
16
ARSSI SDI
SCK nSEL SDO nIRQ nRES nINT /
VDI
11 14
VSS VDD
RFM12B
FEATURES
• Fully integrated (low BOM, easy design-in)
• No alignment required in production
• Fast-settling, programmable, high-resolution PLL synthesizer
• Fast frequency-hopping capability
• High bit rate (up to 115.2 kbps in digital mode and 256 kbps
in analog mode)
• Direct differential antenna input/output
• Integrated power amplifier
• Programmable TX frequency deviation (15 to 240 kHz)
• Programmable RX baseband bandwidth (67 to 400 kHz)
• Analog and digital RSSI outputs
• Automatic frequency control (AFC)
• Data quality detection (DQD)
• Internal data filtering and clock recovery
• RX synchron pattern recognition
• SPI compatible serial control interface
• Clock and reset signals for microcontroller
• 16-bit RX Data FIFO
• Two 8-bit TX data registers
• Low power duty cycle mode
• Standard 10 MHz crystal reference with on-chip tuning
• Wake-up timer
• 2.2 to 3.8 V supply voltage
• Low power consumption
• Low standby current (0.3 μA)
• Compact 16 pin TSSOP package
• Supports very short packets (down to 3 bytes)
• Excellent temperature stability of the RF parameters
• Good adjacent channel rejection/blocking
TYPICAL APPLICATIONS
• Home security and alarm
• Remote control, keyless entry
• Wireless keyboard/mouse and other PC peripherals
• Toy controls
• Remote keyless entry
• Tire pressure monitoring
• Telemetry
• Personal/patient data logging
• Remote automatic meter reading
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