AD9559PCBZ datasheet(100/120 Pages) AD

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AD9559

Data Sheet

Rev. 0 | Page 100 of 120

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

Table 143. Base Digital Loop Filter with Normal Phase Margin (PM = 70°, BW = 0.1 Hz, Third Pole Frequency = 1 Hz, N1 = 1)1

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 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 locked.

Table 144. Base Digital Loop Filter with High Phase Margin (PM = 88.5°, BW = 0.1 Hz, Third Pole Frequency = 20 Hz, N1 = 1)1

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

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 locked.

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