Sundance SMT702 - Manual (Page 47)

0 0 Normal Operation
1 1 All register set to the default values
4.3.1.2.24 Frequency Synthesizer (LMX2531) Register R6 – 0xD8
(write and read).
Offset 0x0400 - Frequency Synthesizer (LMX2531) Register R6 – 0xD8 (write and read)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
2 Reserved XTLSEL[2:0]
Default ‘00000’ ‘000’
1 VCO_ACI_SEL[3:0] EN_LPF
LTR
R4_ADJ[1:0] R4_ADJ_FL[1:0
]
Default ‘0000’ ‘0’ ‘00’ ‘00’
0 R4_ADJ_FL[1:0] R3_ADJ[1:0] R3_ADJ_FL[1:0] C3_4_ADJ[2:0]
Default ‘00’ ‘00’ ‘00’ ‘000’
Offset 0x0400 - Frequency Synthesizer (LMX2531) Register R6 – 0xD8 (write and read)
Setting Bit 2-0 Value for C3 and C4 in the internal loop filter – C3_4_ADJ[2:0]
0 0x0 C3=50pF and C4=50pF
1 0x1 C3=50pF and C4=100pF
2 0x2 C3=50pF and C4=150pF
3 0x3 C3=100pF and C4=50pF
4 0x4 C3=150pF and C4=50pF
5 0x5 C3=100pF and C4=100pF
6 0x6 C3=50pF and C4=150pF
7 0x7 C3=50pF and C4=150pF
Setting Bit 4-3 Value for internal loop filter resistor R3 during fastlock – R3_ADJ_FL[1:0]
0 0x0 10 kΩ
1 0x1 20 kΩ
2 0x2 30 kΩ
3 0x3 40 kΩ
Setting Bit 6-5 Value for internal loop filter resistor R3 – R3_ADJ[1:0]
0 0x0 10 kΩ
1 0x1 20 kΩ
2 0x2 30 kΩ
3 0x3 40 kΩ
Setting Bit 8-7 Value for internal loop filter resistor R4 during fastlock – R3_ADJ_FL[1:0]
0 0x0 10 kΩ
1 0x1 20 kΩ
2 0x2 30 kΩ
3 0x3 40 kΩ
Setting Bit 10-9 Value for internal loop filter resistor R4 – R4_ADJ[1:0]
0 0x0 10 kΩ
1 0x1 20 kΩ
2 0x2 30 kΩ
3 0x3 40 kΩ