AD9557SLASHPCBZ datasheet(72/92 Pages) AD

72 / 92 page

AD9557

Data Sheet

Rev. A | Page 72 of 92

Table 63. Base Digital Loop Filter with Normal Phase Margin (PM = 70°, BW = 0.1 Hz, Pole Frequency = 2 Hz, N1 = 1)1

Address

Bits

Bit Name

Description

0x0323

[7:0]

Alpha-0 coefficient linear bits [7:0]

0x0324

[7:0]

NPM Alpha-0 linear

Alpha-0 coefficient linear bits [15:8]

Reserved

0x0325

[6:0]

NPM Alpha-1 exponent

Alpha-1 coefficient exponent bits [6:0]

0x0326

[7:0]

NPM Beta-0 linear

Beta-0 coefficient linear bits [7:0]

0x0327

[7:0]

Beta-0 coefficient linear bits [15:8]

0x0328

Reserved

[6:0]

NPM Beta-1 exponent

Beta-1 coefficient exponent bits [6:0]

0x0329

[7:0]

NPM Gamma-0 linear

Gamma-0 coefficient linear bits [7:0]

0x032A

[7:0]

Gamma-0 coefficient linear bits [15:8]

0x032B

Reserved

[6:0]

NPM Gamma-1 exponent

Gamma-1 coefficient exponent bits [6:0]

0x032C

[7:0]

NPM Delta-0 linear

Delta-0 coefficient linear bits [7:0]

0x032D

[7:0]

Delta-0 coefficient linear bits [15:8]

0x032E

Reserved

[6:0]

NPM Delta-1 exponent

Delta-1 coefficient exponent bits [6:0]

1Note 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 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.

OUTPUT PLL CONFIGURATION (REGISTER 0x0400 TO REGISTER 0x0408)

Table 64. Output PLL Setting1

Address

Bits

Bit Name

Description

0x0400

[7:0]

Output PLL (APLL)

charge pump current

LSB = 3.5 μA

00000001b = 1 × LSB; 00000010b = 2 × LSB

11111111b = 255 × LSB

Default: 0x81 = 451 μA CP current

0x0401

[7:0]

APLL N divider

Division = 14 to 255

Default: 0x14 = divide-by-20

0x0402

[7:0]

Reserved

0x0403

[7:6]

APLL loop filter control

Pole 2 resistor, Rp2; default: 0x07

Rp2 (Ω)

Bit 7

Bit 6

500 (default)

333

250

200

[5:3]

Zero resistor, Rzero

Rzero (Ω)

Bit 5

Bit 4

Bit 3

1500 (default)

1250

1000

930

1250

1000

750

680

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