TH7120

300 to 930MHz

FSK/FM/ASK Transceiver

3901007120

Page 8 of 28

Data Sheet

Rev. 005

Jan. 2002

PR

EL

IM

INA

RY

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

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

Channel frequency

433.92 MHz

868.3 MHz

315 MHz

915 MHz

FS0/SDEN

10

1

0

FS1/LD

00

1

1

Reference oscillator frequency

7.1505 MHz

R counter ratio in RX mode

16

16

18

30

PFD frequency in RX mode

446.91 kHz

446.91 kHz

397.25 kHz

238.35 kHz

N/A counter ratio in RX mode

947

1919

766

3794

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

16

16

18

30

PFD frequency in TX mode

446.91 kHz

446.91 kHz

397.25 kHz

238.35 kHz

N/A counter ratio in TX mode

971

1943

793

3839

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 frequency in RX mode

10.7 MHz

10.7 MHz

10.7 MHz

10.7 MHz