th7121 ETC-unknow, th7121 Datasheet - Page 8

• Manufacturer Part Number: th7121
• Description: 300 To 930mhz Fsk/fm/ask Transceiver
• Manufacturer: ETC-unknow

Stand-Alone Fixed-Frequency Operation
After power up the transceiver is set to fixed-frequency mode. In this mode, pins FS0/SDEN and FS1/LD
must be connected to V
and FS1/LD must not be changed after power up in order to remain in fixed-frequency mode. The default
settings of the control word bits in stand-alone mode are described in the frequency selection table.
Frequency Selection
3901007121
Rev. 001
FS0/SDEN
FS1/LD
Reference oscillator frequency
R counter ratio in RX mode
PFD frequency in RX mode
N/A counter ratio in RX mode
VCO frequency in RX mode
RX frequency
R counter ratio in TX mode
PFD frequency in TX mode
N/A counter ratio in TX mode
VCO frequency in TX mode
TX frequency
IF frequency in RX mode
Channel frequency
EE
or V
CC
to set the desired frequency of operation. The logic levels at pins FS0/SDEN
433.92 MHz
423.22 MHz
433.92 MHz
433.92 MHz
433.92 MHz
446.91 kHz
446.91 kHz
10.7 MHz
947
971
16
16
1
0
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857.60 MHz
868.30 MHz
868.30 MHz
868.30 MHz
446.91 kHz
446.91 kHz
868.3 MHz
10.7 MHz
1919
1943
16
16
0
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
315 MHz
766
793
18
18
1
1
300 to 930MHz
TH7121
904.30 MHz
915.00 MHz
915.00 MHz
915.00 MHz
238.35 kHz
238.35 kHz
10.7 MHz
915 MHz
Data Sheet
3794
3839
Jan. 2002
30
30
0
1