th7122 Melexis Company, th7122 Datasheet - Page 18

• Manufacturer Part Number: th7122
• Description: Transceiver - 27 To 930mhz, Fsk/fm/ask, Multi-channel Lqfp32
• Manufacturer: Melexis Company

4
4.1
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 V
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
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
Note: Pins with internal pull-down
39010 07122
Rev. 008
FS0/SDEN
FS1/LD
Reference oscillator frequency
R counter ratio in RX mode (RR)
PFD frequency in RX mode
N counter ratio in RX mode (NR)
VCO frequency in RX mode
RX frequency
R counter ratio in TX mode (RT)
PFD frequency in TX mode
N counter ratio in TX mode (NT)
VCO frequency in TX mode
TX frequency
IF in RX mode
Description of User Modes
Stand-alone User Mode Operation
Frequency Selection
Operation Mode
Channel frequency
Operation mode
RE/SCLK
TE/SDTA
EE
or V
CC
to set the desired frequency of operation. The logic level at pin FS0/SDEN
433.92 MHz
423.22 MHz
433.92 MHz
433.92 MHz
433.92 MHz
223.45 kHz
223.45 kHz
10.7 MHz
Standby
1894
1942
32
32
1
0
0
0
Page 18 of 44
857.60 MHz
868.30 MHz
868.30 MHz
868.30 MHz
446.91 kHz
446.91 kHz
868.3 MHz
10.7 MHz
Receive
1919
1943
16
16
0
0
1
0
7.1505 MHz
FSK/FM/ASK Transceiver
304.30 MHz
315.00 MHz
315.00 MHz
315.00 MHz
397.25 kHz
397.25 kHz
10.7 MHz
Transmit
315 MHz
766
793
18
18
1
1
0
1
27 to 930MHz
TH7122
904.30 MHz
915.00 MHz
915.00 MHz
915.00 MHz
223.45 kHz
223.45 kHz
10.7 MHz
915 MHz
Data Sheet
4047
4095
Idle
32
32
0
1
1
1
June/07