AD9548SLASHPCBZ datasheet(89/112 Pages) AD

89 / 112 page

AD9548

Rev. 0 | Page 89 of 112

Address

Bits

Bit Name

Description

069C

[7]

Delta-1 exponent

Delta-1 coefficient exponent, Bit 0

[6:0]

Delta-0 linear

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

069D

[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 104. R-Divider—Profile 21

Address

Bits

Bit Name

Description

069E

[7:0]

R, Bits[7:0]

069F

[7:0]

R, Bits[15:8]

06A0

[7:0]

R, Bits[23:16]

06A1

[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 105. S-Divider—Profile 21

Address

Bits

Bit Name

Description

06A2

[7:0]

S, Bits[7:0]

06A3

[7:0]

S, Bits[15:8]

06A4

[7:0]

S, Bits[23:16]

06A5

[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 106. Fractional Feedback Divider—Profile 2

Address

Bits

Bit Name

Description

06A6

[7:0]

V, Bits[7:0]

06A7

[7:4]

U, Bits[3:0]

[3:2]

Unused

[1:0]

V, Bits[9:8]

06A8

[7:6]

Unused

[5:0]

U, Bits[9:4]

Table 107. Lock Detectors—Profile 2

Address

Bits

Bit Name

Description

06A9

[7:0]

Phase lock threshold

(in picoseconds)

Phase lock threshold, Bits[7:0]

06AA

[7:0]

Phase lock threshold, Bits[15:8]

06AB

[7:0]

Phase lock fill rate

Phase lock fill rate, Bits[7:0]

06AC

[7:0]

Phase lock drain rate

Phase lock drain rate, Bits[7:0]

06AD

[7:0]

Frequency lock thresh-

old (in picoseconds)

Frequency lock threshold, Bits[7:0]

06AE

[7:0]

Frequency lock threshold, Bits[15:8]

06AF

[7:0]

Frequency lock threshold, Bits[23:16]

06B0

[7:0]

Frequency lock fill rate

Frequency lock fill rate, Bits[7:0]

06B1

[7:0]

Frequency lock drain

rate

Frequency lock drain rate, Bits[7:0]

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