AD9548SLASHPCBZ datasheet(84/112 Pages) AD

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AD9548

Rev. 0 | Page 84 of 112

Table 83. Digital Loop Filter Coefficients—Profile 01

Address

Bits

Bit Name

Description

0612

[7:0]

Alpha-0 linear

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

0613

[7:0]

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

0614

[7:6]

Alpha-2 exponent

Alpha-2 coefficient exponent, Bits[1:0]

[5:0]

Alpha-1 exponent

Alpha-1 coefficient exponent, Bits[5:0]

0615

[7:1]

Beta-0 linear

Beta-0 coefficient linear, Bits[6:0]

[0]

Alpha-2 exponent

Alpha-2 coefficient exponent, Bit 2

0616

[7:0]

Beta-0 linear

Beta-0 coefficient linear, Bits[14:7]

0617

[7]

Unused

[6:2]

Beta-1 exponent

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

[1:0]

Beta-0 linear

Beta-0 coefficient linear, Bits[16:15]

0618

[7:0]

Gamma-0 linear

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

0619

[7:0]

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

061A

[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

061B

[7:0]

Delta-0 linear

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

061C

[7]

Delta-1 exponent

Delta-1 coefficient exponent, Bit 0

[6:0]

Delta-0 linear

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

061D

[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 84. R-Divider—Profile 01

Address

Bits

Bit Name

Description

061E

[7:0]

R, Bits[7:0]

061F

[7:0]

R, Bits[15:8]

0620

[7:0]

R, Bits[23:16]

0621

[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 85. S-Divider—Profile 01

Address

Bits

Bit Name

Description

0622

[7:0]

S, Bits[7:0]

0623

[7:0]

S, Bits[15:8]

0624

[7:0]

S, Bits[23:16]

0625

[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.

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