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PDF RFM12B Data sheet ( Hoja de datos )
| Número de pieza | RFM12B | |
| Descripción | Universal ISM Band FSK Transceiver | |
| Fabricantes | HOPERF | |
| Logotipo |  |
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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’ EZRadioTM 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
RF1 13
RF2 12
LNA
PA
MIX
I
AMP OC
MIX Q
Self cal.
AMP OC
RF Parts
PLL & I/Q VCO
with cal.
RSSI
BB Amp/Filt./Limiter
I/Q
DEMOD
COMP
DQD
AFC
Data Filt
CLK Rec data
FIFO
7 DCLK /
CFIL /
FFIT /
6
FSK /
DATA /
nFFS
Data processing units
CLK div
8
CLK
Xosc
9
XTL /
REF
W TM
with cal.
LBD
Low Power parts
Controller
Bi as
15 1
ARSSI SDI
234
SCK nSEL SDO
5 10 16
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
1
Free Datasheet http://www.datasheet4u.com/
1 page  
Internal Pin Connections
Pin Name Internal connection
1 SDI
VDD
2 SCK
3 nSEL
PAD
1.5k
VSS
4 SDO
5 nIRQ
FSK
6 DATA
nFFS
DLCK
7 CFIL
FFIT
8 CLK
XTL
9
REF
VDD
PAD
10
VSS
RFM12B
Pin Name Internal connection
10 nRES
11 VSS
12 RF2
13 RF1
14 VDD
15 ARSSI
nINT
16
VDI
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
RFM12B
AC Characteristics (Transmitter)
Symbol
I OUT
P max_50
P max_ant
P out
P sp
P harm
Co
Qo
L out
BR TX
BRA TX
df fsk
Parameter
Open collector output DC current
Max. output power delivered to 50
Ohm load over a suitable matching
network (Note 4)
Max. EIRP with suitable selected
PCB antenna (Note 6)
Typical output power
Spurious emission
l f-fsp l > 1 MHz
Harmonic suppression
Output capacitance (set by the
automatic antenna tuning circuit)
Quality factor of the output
capacitance
Output phase noise
FSK bit rate
FSK bit rate
FSK frequency deviation
Conditions/Notes
Programmable
In 433 MHz band
In 868 MHz / 915 MHz bands
In 433 MHz band with monopole antenna
with matching network (Note 4)
In 868 MHz / 915 MHz bands (Note 5)
Selectable in 2.5 dB steps (Note 7)
At max power 50 Ohm load (Note 4)
With PCB antenna (Note 5)
At max power 50 Ohm load (Note 4)
With PCB antenna (Note 5)
In 433 MHz band
In 868 MHz / 915 MHz bands
In 433 MHz band
In 868 MHz / 915 MHz bands
100 kHz from carrier, in 868 MHz band
1 MHz from carrier, in 868 MHz band
Via internal TX data register
TX data connected to the FSK input
Programmable in 15 kHz steps
AC Characteristics (Turn-on/Turnaround timings)
Min Typ
0.5
7
5
7
P max -17.5
7
2 2.6
2.1 2.7
13 15
8 10
-80
-103
15
Max Units
6 mA
dBm
dBm
P max
-55
-60
-35
-42
3.2
3.3
17
12
172
256
240
dBm
dBc
dBc
pF
dBc/Hz
kbps
kbps
kHz
Symbol
t sx
Parameter
Crystal oscillator startup time
Ttx_XTAL_ON Transmitter turn-on time
Trx_XTAL_ON Receiver turn-on time
Ttx_rx_SYNT_ON Transmitter – Receiver turnover time
Trx_tx_SYNT_ON Receiver – Transmitter turnover time
Conditions/Notes
Default capacitance bank setting, crystal
ESR < 50 Ohm (Note 9). Crystal load
capacitance = 16 pF.
Synthesizer off, crystal oscillator on with
10 MHz step
Synthesizer off, crystal oscillator on with
10 MHz step
Synthesizer and crystal oscillator on
during TX/RX change with 10 MHz step
Synthesizer and crystal oscillator on
during RX/TX change with 10 MHz step
AC Characteristics (Others)
Min Typ Max Units
2 7 ms
250 µs
250 µs
150 µs
150 µs
Symbol
C xl
t POR
Parameter
Crystal load capacitance,
see crystal selection guide
Internal POR timeout
tPBt Wake-up timer clock accuracy
CinD Digital input capacitance
tr, tf Digital output rise/fall time
Conditions/Notes
Programmable in 0.5 pF steps, tolerance
± 10%
After Vdd has reached 90% of final value
(Note 8)
Crystal oscillator must be enabled to
ensure proper calibration at the start up.
(Note 9)
15 pF pure capacitive load
Min Typ Max Units
8.5 16 pF
100 ms
± 10
2
10
%
pF
ns
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RFM12B.PDF ] | |
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