Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
Table 1. Register Tables
MSB
SHIFT REGISTER DATA
Upper (MSBs) Fractional Divider Value (F) 14 Bits (Default = 8192, 10000000000000)
LSB
ADDRESS
Address
27
26
25
24
23
22
21
20
19
18
17
16
15
14
0
0
Lower (LSBs) Fractional Divider Value (F)14 Bits (Default 0 DEC, 00000000000000
Address
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
R Divider
Default = 00
CP Bleed
Default = 00
CP Current
Default = 11
Integer Divide Value (N) 8 Bits
Default = 177 DEC
Address
R1
R0
LIN1
LIN0
CP1
CP0
7
6
5
4
3
2
1
0
1
0
Reset Delay
Default = 00
Test Registers 6 Bits
Default = 0 DEC
Control Register 6 Bits
Default = 15 DEC
Address
BL1
BL0
T5
T4
T3
T2
T1
T0
INT
PD
TE
BE
XX
CPX
1
1
Table 2. Reference Divider
R1
0
0
1
1
R0
0
1
0
1
REFERENCE DIVIDE VALUE
1
2
3
4
Table 3. Integer Divider-N*
N7
0
0
1
1
N6
0
0
1
1
N5
1
1
1
1
N4
0
0
1
1
N3
0
0
1
1
N2
0
1
0
0
N1
1
0
1
1
N0
1
0
0
1
INTEGER DIVIDE VALUE
35
36
250
251
*N divider is limited to 35 < N < 251.
Table 4. Fractional Divider-F (Upper 14 Bits)
F27
0
0
1
F26
0
0
1
F25
0
0
1
F24
0
0
1
F23
0
0
1
F22
0
0
1
F21
0
0
1
F20
0
0
1
F19
0
0
1
F18
0
0
1
F17
0
0
1
F16
0
0
1
F15
0
0
1
F14
0
0
1
Table 5. Fractional Divider-F (Lower 14 Bits)
F13
0
0
1
1
F12
0
0
1
1
F11
0
0
1
1
F10
0
0
1
1
F9
0
0
1
1
F8
0
0
1
1
F7
0
0
1
1
F6
0
0
1
1
F5
0
0
1
1
F4
0
0
1
1
F3
0
0
1
1
F2
0
0
1
1
F1
0
0
1
1
F0
0
1
0
1
INTEGER DIVIDE
VALUE
1
2
268435454
268435455
______________________________________________________________________________________
11
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