AD9857 Analog Devices, AD9857 Datasheet - Page 22

• Manufacturer Part Number: AD9857
• Description: CMOS 200 MSPS 14-Bit Quadrature Digital Upconverter
• Manufacturer: Analog Devices

AD9857
PROFILE #2
Tuning Word—Register Address 0Eh, Bits 0, 1, 2, 3, 4, 5, 6, 7
The lower byte of the 32-bit frequency tuning word, Bits 0–7.
Tuning Word—Register Address 0Fh, Bits 0, 1, 2, 3, 4, 5, 6, 7
The second byte of the 32-bit frequency tuning word, Bits 8–15.
Tuning Word—Register Address 10h, Bits 0, 1, 2, 3, 4, 5, 6, 7
The third byte of the 32-bit frequency tuning word, Bits 16–23.
Tuning Word—Register Address 11h, Bits 0, 1, 2, 3, 4, 5, 6,7
The fourth byte of the 32-bit frequency tuning word, Bits 24–31.
Inverse CIC Bypass—Register Address 12h, Bit 0
When set to a Logic 1, the Inverse CIC filter is BYPASSED.
When set to a Logic 0, the Inverse CIC filter is active.
Spectral Invert—Register Address 12h, Bit 1
The quadrature modulator takes the form:
CIC Interpolation Rate—Register Address 12h, Bits 2, 3, 4,
5, 6, 7
00h: Invalid entry.
01h: CIC filters BYPASSED.
02h–3Fh: CIC interpolation rate (2–63, decimal).
Output Scale Factor—Register Address 13h, Bits 0, 1, 2, 3, 4,
5, 6, 7
An 8-bit number that serves as a multiplier for the data path-
way before the data is delivered the DAC. It has an LSB
weight of 2
0 to 1.9921875.
I
I
cos( ) + Q
cos( ) + Q
–7
(0.0078125). This yields a multiplier range of
sin( ) when set to a Logic 1.
sin( ) when set to a Logic 0.
PROFILE #3
Tuning Word—Register Address 14h, Bits 0, 1, 2, 3, 4, 5, 6, 7
The lower byte of the 32-bit frequency tuning word, Bits 0–7.
Tuning Word—Register Address 15h, Bits 0, 1, 2, 3, 4, 5, 6, 7
The second byte of the 32-bit frequency tuning word, Bits 8–15.
Tuning Word—Register Address 16h, Bits 0, 1, 2, 3, 4, 5, 6, 7
The third byte of the 32-bit frequency tuning word, Bits 16–23.
Tuning Word—Register Address 17h, Bits 0, 1, 2, 3, 4, 5, 6, 7
The fourth byte of the 32-bit frequency tuning word, Bits 24–31.
Inverse CIC Bypass—Register Address 18h, Bit 0
When set to a Logic 1, the Inverse CIC filter is BYPASSED.
When set to a Logic 0, the Inverse CIC filter is active.
Spectral Invert—Register Address 18h, Bit 1
The quadrature modulator takes the form:
CIC Interpolation Rate—Register Address 18h, Bits 2, 3, 4,
5, 6, 7
00h: Invalid entry.
01h: CIC filters BYPASSED.
02h–3Fh: CIC interpolation rate (2–63, decimal).
Output Scale Factor—Register Address 19h, Bits 0, 1, 2, 3, 4,
5, 6, 7
An 8-bit number that serves as a multiplier for the data pathway
before the data is delivered the DAC. It has an LSB weight
of 2
0 to 1.9921875.
I
I
–7
cos( ) + Q
cos( ) + Q
(0.0078125). This yields a multiplier range of
sin( ) when set to a Logic 1.
sin( ) when set to a Logic 0.