AD9548SLASHPCBZ datasheet(91/112 Pages) AD

91 / 112 page

AD9548

Rev. 0 | Page 91 of 112

Address

Bits

Bit Name

Description

06CA

[7:0]

Gamma-0 linear

Gamma-0 coefficient linear, Bits[7:0]

06CB

[7:0]

Gamma-0 coefficient linear, Bits[15:8]

06CC

[7:6]

Unused

[5:1]

Gamma-1 exponent

Gamma-1 coefficient exponent, Bits[4:0]

[0]

Gamma-0 linear

Gamma-0 coefficient linear, Bit 16

06CD

[7:0]

Delta-0 linear

Delta-0 coefficient linear, Bits[7:0]

06CE

[7]

Delta-1 exponent

Delta-1 coefficient exponent, Bit 0

[6:0]

Delta-0 linear

Delta-0 coefficient linear, Bits[14:8]

06CF

[7:4]

Alpha-3 exponent

Alpha-3 coefficient exponent, Bits[3:0]

[3:0]

Delta-1 exponent

Delta-1 coefficient exponent, Bits[4:1]

1 The digital loop filter coefficients (α, β, γ, and δ) have the general form: x(2y), where x is the linear component and y is the exponential component of the coefficient. The

value of the linear component (x) constitutes a fraction, where 0 ≤ x < 1. The exponential component (y) is an integer. See the Calculating Digital Filter Coefficients section

for details.

Table 114. R Divider—Profile 31

Address

Bits

Bit Name

Description

06D0

[7:0]

R, Bits[7:0]

06D1

[7:0]

R, Bits[15:8]

06D2

[7:0]

R, Bits[23:16]

06D3

[7:6]

Unused

[5:0]

R, Bits[29:24]

1 The value stored in the R-divider register yields an actual divide ratio of one more than the programmed value.

Table 115. S Divider—Profile 31

Address

Bits

Bit Name

Description

06D4

[7:0]

S, Bits[7:0]

06D5

[7:0]

S, Bits[15:8]

06D6

[7:0]

S, Bits[23:16]

06D7

[7:6]

Unused

[5:0]

S, Bits[29:24]

1 The value stored in the S-divider register yields an actual divide ratio of one more than the programmed value. Furthermore, the value of S must be at least 7.

Table 116. Fractional Feedback Divider—Profile 3

Address

Bits

Bit Name

Description

06D8

[7:0]

V, Bits[7:0]

06D9

[7:4]

U, Bits[3:0]

[3:2]

Unused

[1:0]

V, Bits[9:8]

06DA

[7:6]

Unused

[5:0]

U, Bits[9:4]

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