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PDF RFM12B Data sheet ( Hoja de datos )
| Número de pieza | RFM12B | |
| Descripción | Universal ISM Band FSK Transceiver Module | |
| Fabricantes | Hope RF | |
| Logotipo |  |
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RFM12B
Datasheet REV1.2
UNIVERSAL ISM BAND FSK TRANSCEIVER MODULE
RFM12B
（the purpose of this spec covers mainly for the
physical characteristic of the module, for register
configure and its related command info please refer
to RF12B data sheets）
RFM12B
General Introduction
RFM12B is a low costing ISM band transceiver
module implemented with unique PLL. It works
signal ranges from 433/868/915MHZ bands, comply
with FCC, ETSI regulation. The SPI interface is
used to communicate with microcontroller for
parameter setting.
Features:
• Low costing, high performance and price ratio
• Tuning free during production
• PLL and zero IF technology
• Fast PLL lock time
• High resolution PLL with 2.5 KHz step
• High data rate (up to 115.2 kbps with internal demodulator，with external RC filter highest data rate is
256 kbps)
• Differential antenna input/output
• Automatic antenna tuning
• Programmable TX frequency deviation (from 15 to 240 KHz)
• Programmable receiver bandwidth (from 67 to 400 kHz)
• Analog and digital signal strength indicator (ARSSI/DRSSI)
• 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 signal output for external MCU use
• 16 bit RX Data FIFO
• Two 8 bit TX data registers
• Standard 10 MHz crystal reference
• Wakeup timer
• 2.2V – 3.8V power supply
• Low power consumption
• Standby current less than 0.3uA
• Supports very short packets (down to 3 bytes)
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
1 page  
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AC characteristic(Transmitter)
symbol parameter
remark
433MHz band
Pmax
Max. available output power
868MHz band
915MHz band
Pout Typical output power
Selectable in 3 dB
steps
Co Output capacitance
In low bands
(set by the automatic antenna In high bands
tuning circuit)
Qo Quality factor of the output In low bands
capacitance
In high bands
Lout Output phase noise
100 kHz from carrier
1 MHz from carrier
BRTX
FSK bit rate
Via internal TX data
register
BRATX FSK bit rate
TX data connected to the
FSK input
dffsk FSK frequency deviation
Programmable in 15
kHz steps
RFM12B
Datasheet REV1.2
min
3
2
2
Pmax-21
typical
5
4
4
max
Pmax
Unit
dBm
dbm
2 2.6 3.2 pf
2.1 2.7 3.3
13 15 17
8 10 12
-80 dbc/HZ
-103
172 kbps
256 kbps
15 240 kHZ
AC characteristic(Turn-on/Turnaround timings)
symbol
parameter
remark
min typical max Unit
Tst
Crystal oscillator
Crystal ESR < 100
startup time
1 5 ms
Ttx_XTAL_ON
Transmitter
time
turn-on Synthesizer off, crystal
oscillator on with 10 MHz step
250 us
Trx_XTAL_ON
Receiver turn-on time
Synthesizer off, crystal
oscillator on with 10 MHz step
250 us
Transmitter
– Synthesizer and crystal
Ttx_rx_SYNT_ON
Receiver turnover time
oscillator on during TX/RX
change with 10 MHz step
150 us
Receiver
– Synthesizer and crystal
Trx_tx_SYNT_ON
Transmitter turnover
time
oscillator on during RX/TX
change with 10 MHz step
150 us
Cxl Crystal load
capacitance
Programmable in 0.5 pF steps, 8.5
tolerance+/- 10%
16 pf
tPOR Internal POR timeout After Vdd has reached 90% of
final value
100 ms
tPBt
Wake-up timer clock
Calibrated every 30 seconds 0.96
1.05 ms
period
Cin, D
Digital input apacitance
2 pf
tr, f
Digital output rise/fall time
15pF pure capacitive load
10 ns
Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: [email protected] http://www.hoperf.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RFM12B.PDF ] | |
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