AD9915 AD [Analog Devices], AD9915 Datasheet - Page 45

• Manufacturer Part Number: AD9915
• Description: 2.5 GSPS Direct Digital Synthesizer with 12-Bit DAC
• Manufacturer: AD [Analog Devices]

Data Sheet
Digital Ramp Rate Register—Address 0x08
This register is effective only if the digital ramp enable bit in the CFR2 register (0x01[19]) = 1. See the Digital Ramp Generator (DRG)
section for details.
Table 25. Bit Descriptions for Digital Ramp Rate Register
Bit(s)
[31:16]
[15:0]
Lower Frequency Jump Register—Address 0x09
This register is effective only if the digital ramp enable bit (0x01[19]) = 1 and the frequency jump enable bit (0x01[14]) = 1 in the CFR2
register. See the Digital Ramp Generator (DRG) section for details.
Table 26. Bit Descriptions for Lower Frequency Jump Register
Bit(s)
[31:0]
Upper Frequency Jump Register—Address 0x0A
This register is effective only if the digital ramp enable bit (0x01[19]) = 1 and the frequency jump enable bit (0x01[14]) = 1 in the CFR2
register. See the Digital Ramp Generator (DRG) section for details.
Table 27. Bit Descriptions for Upper Frequency Jump Register
Bit(s)
[31:0]
Mnemonic
Digital ramp negative slope
rate
Digital ramp positive slope
rate
Mnemonic
Lower frequency jump
point
Mnemonic
Upper frequency jump
point
Description
32-bit digital lower frequency jump value. Any time the lower frequency jump value is
reached during a frequency sweep, the output frequency jumps to the upper frequency
value instantaneously and continues frequency sweeping in a phase-continuous manner.
Description
32-bit digital upper frequency jump value. Any time the upper frequency jump value is
reached during a frequency sweep, the output frequency jumps to the lower frequency
value instantaneously and continues frequency sweeping in a phase-continuous manner.
Description
16-bit digital ramp negative slope value that defines the time interval between decrement
values.
16-bit digital ramp positive slope value that defines the time interval between increment
values.
Rev. A | Page 45 of 48
AD9915