Sundance SMT399-160 - Manual (Page 25)

5.4.10 DDS0 Register – 0x9 – Amplitude Scale Factor.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0x9 – Amplitude Scale Factor
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Amplitude Scale Factor Register[7:0]
Default ‘00000000’
1 Auto Ramp Rate Speed Amplitude Scale Factor Register[13:8]
Default ‘00’ ‘000000’
DDS0 Register – 0x9 – Amplitude Scale Factor
Setting Auto Ramp
Rate Speed
(Bit 15-14)
Description
0 0 Tell the OSK block how many amplitude steps to each increase.
DDS0 Register – 0x9 – Amplitude Scale Factor
Setting Amplitude
Scale
Factor
(Bit 13-0)
Description
Programs the maximum value achievable by the OSK.
5.4.11 DDS0 Register – 0xA – Amplitude Ramp Rate.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0xA – Amplitude Ramp Rate
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Amplitude Ramp Rate
Default ‘00000000’
DDS0 Register – 0xA – Amplitude Ramp Rate
Setting Amplitude
Ramp
Rate (Bit
7-0)
Description
The 8-bit amplitude ramp rate used in the auto OSK mode.
5.4.12 DDS0 Register – 0xB – Frequency Tuning Word 0.
For more details, refer to AD9954 datasheet.
DDS0 Register – 0xB – Frequency Tuning Word 0
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Frequency Tuning Word 0[7:0]
Default ‘00000000’
1 Frequency Tuning Word 0[15:8]
Default ‘00000000’
User Manual SMT399-160 Page 25 of 39 Last Edited: 24/05/2007 17:12:00