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TH71221 Scheda tecnica(PDF) 18 Page - Melexis Microelectronic Systems

Il numero della parte TH71221
Spiegazioni elettronici  27 to 930MHz FSK/FM/ASK Transceiver
PDF  44 Pages
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Produttore elettronici  MELEXIS [Melexis Microelectronic Systems]
Homepage  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
39010 071221
Page 18 of 44
Data Sheet
Rev. 005
June/07
4
Description of User Modes
4.1
Stand-alone User Mode Operation
After power up the transceiver is set to stand-alone user mode. In this mode, pins FS0/SDEN and FS1/LD
must be connected to VEE or VCC to set the desired frequency of operation. The logic level at pin FS0/SDEN
must not be changed after power up in order to remain in stand-alone user mode. The default settings of the
control word bits in stand-alone user mode are described in the frequency selection table. Detailed informa-
tion about the default settings can be found in the tables of section 5.
4.1.1
Frequency Selection
Channel frequency
433.92 MHz
868.3 MHz
315 MHz
915 MHz
FS0/SDEN
1
0
1
0
FS1/LD
0
0
1
1
Reference oscillator frequency
7.1505 MHz
R counter ratio in RX mode (RR)
32
16
18
32
PFD frequency in RX mode
223.45 kHz
446.91 kHz
397.25 kHz
223.45 kHz
N counter ratio in RX mode (NR)
1894
1919
766
4047
VCO frequency in RX mode
423.22 MHz
857.60 MHz
304.30 MHz
904.30 MHz
RX frequency
433.92 MHz
868.30 MHz
315.00 MHz
915.00 MHz
R counter ratio in TX mode (RT)
32
16
18
32
PFD frequency in TX mode
223.45 kHz
446.91 kHz
397.25 kHz
223.45 kHz
N counter ratio in TX mode (NT)
1942
1943
793
4095
VCO frequency in TX mode
433.92 MHz
868.30 MHz
315.00 MHz
915.00 MHz
TX frequency
433.92 MHz
868.30 MHz
315.00 MHz
915.00 MHz
IF in RX mode
10.7 MHz
10.7 MHz
10.7 MHz
10.7 MHz
In stand-alone user mode, the transceiver can be set to Standby, Receive, Transmit or Idle mode (only PLL
synthesizer active) via control pins RE/SCLK and TE/SDTA. The modulation scheme and the LNA gain are
set by pins ASK/FSK and GAIN_LNA, respectively.
4.1.2
Operation Mode
Operation mode
Standby
Receive
Transmit
Idle
RE/SCLK
0
1
0
1
TE/SDTA
0
0
1
1
Note:
Pins with internal pull-down



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