Sundance SMT702 - Manual (Page 48)

Setting Bit 11 Enable for partially integrated internal loop filter – EN_LPFLTR
0 0 Disabled (R3 and R4=0R and C3+C4=200pF)
1 1 Enabled
Setting Bit 15-12 Optimisation of VCO Phase noise – VCO_ACI_SEL
0 0 Should always be set to 8
Setting Bit 18-16 Crystal Selection – XTLSEL[2:0]
0 0x0 <25MHz
1 0x1 25-50MHz
2 0x2 50-70MHz
3 0x3 >70MHz
4 0x4 Manual mode
5 0x5 Reserved
6 0x6 Reserved
7 0x7 Reserved
4.3.1.2.25 Frequency Synthesizer (LMX2531) Register R7 – 0xDC
(write and read).
Offset 0x0400 - Frequency Synthesizer (LMX2531) Register R7 – 0xDC (write and read)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
2 Reserved XTLMAN[11:0]
Default ‘00000’ ‘000000000000’
1 XTLMAN[11:0]
Default ‘000000000000’
0 XTLMAN[11:0] XTLDIV[1:0] Reserved
Default ‘000000000000’ ‘00’ ‘0000’
Offset 0x0400 - Frequency Synthesizer (LMX2531) Register R7 – 0xDC (write and read)
Setting Bit 5-4 Division Ratio for the Crystal Frequency – XTLDIV[1:0]
0 0x0 Reserved
1 0x1 Divide by 2 - <20Mhz
2 0x2 Divide by 4 – 20-40Mhz
3 0x3 Divide by 8 - >40Mhz
Setting Bit 17-6 Manual Crystal Mode – XTLMAN[11:0]
0 0x0 To be programmed with 0s
4.3.1.2.26 Frequency Synthesizer (LMX2531) Register R8 – 0xE0
(write and read).
Offset 0x0400 - Frequency Synthesizer (LMX2531) Register R8 – 0xE0 (write and read)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
2 Reserved
Default ‘00000000’
1 Reserved