Sundance SMT349 - Manual (Page 24)

Version 2.1 Page 24 of 32 SMT349 User Manual
12.4.4 IF/RF Synthesizer Register 0 – 0x3.
For more details, refer to Si4136 datasheet.
IF/RF Synthesizer Register 0 – 0x03
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
1 Reserved Reserved AUXSEL IFDIV Reserved Reserved
Default ‘0’ ‘0’ ‘00’ ‘00’ ‘0’ ‘0’
0 Reserved XIN DIV2 LPWR Reserved Auto PDB Reserved Reserved Reserved
Default ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’ ‘0’
IF/RF Synthesizer Register 0 – 0x03
Setting Bit 3 Description – Auto PDB (Auto power Down)
0 0 Software powerdown is controlled by IF/RF Synthesizer Register 2.
1 1 Equivalent to setting all bits in IF/RF Synthesizer Register 2 to ‘1’.
IF/RF Synthesizer Register 0 – 0x03
Setting Bit 5 Description – LPWR (Power level for IF Synthesizer Circuit)
0 0 Rload < 500 Ohms – Normal Power Mode.
1 1 Rload > 500 Ohms – Low Power Mode.
IF/RF Synthesizer Register 0 – 0x03
Setting Bit 6 Description – XIN DIV2 (Divide by 2 Mode)
0 0 Xin not divided by 2.
1 1 Xin divided by 2.
IF/RF Synthesizer Register 0 – 0x03
Setting Bit 11&10 Description – IFDIV (IF output divider)
0 ‘00’ IFout = IFvco frequency.
1 ‘01’ IFout = IFvco frequency/2.
2 ‘10 IFout = IFvco frequency/4.
3 ‘11’ IFout = IFvco frequency/8.
IF/RF Synthesizer Register 0 – 0x03
Setting Bit 13&12 Description – AUXSEL (Auxiliary Output Pin Definition)
0 ‘00’ Reserved.
1 ‘01’ Force Output Low.
2 ‘10 Reserved.
3 ‘11’ Lock Detect (LDETB).