AD9554 datasheet(89/116 Pages) AD

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Data Sheet

AD9554

Rev. D | Page 89 of 116

DIGITAL LOOP FILTER COEFFICIENTS (REGISTER 0x0800 TO REGISTER 0x0817)

Note that the digital loop filter base 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 a signed integer. These are live registers; therefore, an IO_UPDATE is not needed. However, the updated coefficients do

not take effect while the loop is active.

Table 95. Base Digital Loop Filter with Normal Phase Margin (PM = 70°)

Address

Bits

Bit Name

Description

0x0800

[7:0]

NPM Alpha-0 linear

Alpha-0 coefficient linear, Bits[7:0]. Default: 0x24.

0x0801

[7:0]

Alpha-0 coefficient linear, Bits[15:8]. Default: 0x8C.

0x0802

Reserved

Default: 0b.

[6:0]

NPM Alpha-1 exponent

Alpha-1 coefficient exponent, Bits[6:0]. Default: 0x49.

0x0803

[7:0]

NPM Beta-0 linear

Beta-0 coefficient linear, Bits[7:0]. Default: 0x55.

0x0804

[7:0]

Beta-0 coefficient linear, Bits[15:8]. Default: 0xC9.

0x0805

Reserved

Default: 0b.

[6:0]

NPM Beta-1 exponent

Beta-1 coefficient exponent, Bits[6:0]. Default: 0x7B.

0x0806

[7:0]

NPM Gamma-0 linear

Gamma-0 coefficient linear, Bits[7:0]. Default: 0x9C.

0x0807

[7:0]

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

0x0808

Reserved

Default: 0b.

[6:0]

NPM Gamma -1 exponent

Gamma-1 coefficient exponent, Bits[6:0]. Default: 0x55.

0x0809

[7:0]

NPM Delta-0 linear

Delta-0 coefficient linear, Bits[7:0]. Default: 0xEA.

0x080A

[7:0]

Delta-0 coefficient linear, Bits[15:8]. Default: 0xE2.

0x080B

Reserved

Default: 0b.

[6:0]

NPM Delta-1 exponent

Delta-1 coefficient exponent, Bits[6:0]. Default: 0x57.

Note that the base 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 a signed integer. These are live registers; therefore, an IO_UPDATE is not needed. However, the updated coefficients do

not take effect while the loop is active.

Table 96. Base Digital Loop Filter with High Phase Margin (PM = 88.5°)

Address

Bits

Bit Name

Description

0x080C

[7:0]

HPM Alpha-0 linear

Alpha-0 coefficient linear, Bits[7:0]. Default = 0x8C.

0x080D

[7:0]

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

0x080E

Reserved

Default: 0b.

[6:0]

HPM Alpha-1 exponent

Alpha-1 coefficient exponent, Bits[6:0]. Default: 0x4C.

0x080F

[7:0]

HPM Beta-0 linear

Beta-0 coefficient linear, Bits[7:0]. Default: 0xF5.

0x0810

[7:0]

Beta-0 coefficient linear, Bits[15:8]. Default: 0xCB.

0x0811

Reserved

Default: 0b.

[6:0]

HPM Beta-1 exponent

Beta-1 coefficient exponent, Bits[6:0]. Default: 0x73.

0x0812

[7:0]

HPM Gamma-0 linear

Gamma-0 coefficient linear, Bits[7:0]. Default: 0x24.

0x0813

[7:0]

Gamma-0 coefficient linear, Bits[15:8]. Default: 0xD8.

0x0814

Reserved

Default: 0b.

[6:0]

HPM Gamma-1 exponent

Gamma-1 coefficient exponent, Bits[6:0]. Default: 0x59.

0x0815

[7:0]

HPM Delta-0 linear

Delta-0 coefficient linear, Bits[7:0]. Default: 0xD2.

0x0816

[7:0]

Delta-0 coefficient linear, Bits[15:8]. Default: 0x8D.

0x0817

Reserved

Default: 0b.

[6:0]

HPM Delta-1 exponent

Delta-1 coefficient exponent, Bits[6:0]. Default: 0x5A.

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