AD9857SLASHPCB datasheet(22/31 Pages) AD

22 / 31 page

AD9857

–22–

REV. 0

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:

× cos(ω) + Q × sin(ω) when set to a Logic 1.

× cos(ω) + Q × sin(ω) when set to a Logic 0.

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

–7 (0.0078125). This yields a multiplier range of

0 to 1.9921875.

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:

× cos(ω) + Q × sin(ω) when set to a Logic 1.

× cos(ω) + Q × sin(ω) when set to a Logic 0.

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

–7 (0.0078125). This yields a multiplier range of

0 to 1.9921875.

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