Sundance SMT399-160 - Manual (Page 31)

5.4.30 DDS0 Register – 0x1D – Falling Delta Frequency
Word.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0x1D – Falling Delta Frequency Word
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Falling Delta Frequency Word[23:16]
Default ‘00000000’
1 Falling Delta Frequency Word[31:24]
Default ‘00000000’
DDS0 Register – 0x1D – Falling Delta Frequency Word
Setting Falling
Delta
Frequency
Word
Description
The Falling Delta Frequency word is a 32-bit register that is used in the sweeping mode.
5.4.31 DDS0 Register – 0x1E – Falling Sweep Ramp Rate
Word.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0x1E – Falling Sweep Ramp rate Word
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Falling Sweep Ramp Rate[7:0]
Default ‘00000000’
1 Not Used
Default ‘00000000’
DDS0 Register – 0x1E – Falling Sweep Ramp rate Word
Setting Falling
Delta
Frequency
Word
Description
The Falling Sweep Ramp Rate is a 7-bit register that is used in the sweeping mode.
5.4.32 DDS0 Register – 0x1F – Rising Delta Frequency
Tuning.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0x1F – Rising Delta Frequency Word
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Rising Delta Frequency Word[7:0]
Default ‘00000000’
1 Rising Delta Frequency Word[15:8]
Default ‘00000000’
User Manual SMT399-160 Page 31 of 39 Last Edited: 24/05/2007 17:12:00