Datasheet

AD9548 Data Sheet
Rev. E | Page 84 of 112
Table 84. Digital Loop Filter Coefficients—Profile 0
1
Address Bits Bit Name Description
0x0612 [7:0] Alpha-0 linear Alpha-0 coefficient linear, Bits[7:0]
0x0613
[7:0]
Alpha-0 coefficient linear, Bits[15:8]
0x0614 [7:6] Alpha-2 exponent Alpha-2 coefficient exponent, Bits[1:0]
[5:0] Alpha-1 exponent Alpha-1 coefficient exponent, Bits[5:0]
0x0615 [7:1] Beta-0 linear Beta-0 coefficient linear, Bits[6:0]
[0] Alpha-2 exponent Alpha-2 coefficient exponent, Bit 2
0x0616 [7:0] Beta-0 linear Beta-0 coefficient linear, Bits[14:7]
0x617 [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]
0x0618 [7:0] Gamma-0 linear Gamma-0 coefficient linear, Bits[7:0]
0x0619
[7:0]
Gamma -0 coefficient linear, Bits[15:8]
0x061A [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
0x061B [7:0] Delta-0 linear Delta-0 coefficient linear, Bits[7:0]
0x061C [7] Delta-1 exponent Delta-1 coefficient exponent, Bit 0
[6:0] Delta-0 linear Delta-0 coefficient linear, Bits[14:8]
0x061D [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(2
y
), 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 85. R-Divider—Profile 0
1
Address Bits Bit Name Description
0x061E [7:0] R R, Bits[7:0]
0x061F
[7:0]
R, Bits[15:8]
0x0620 [7:0] R, Bits[23:16]
0x0621 [7:6] Unused
[5:0] R 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 86. S-Divider—Profile 0
1
Address Bits Bit Name Description
0x0622 [7:0] S S, Bits[7:0]
0x0623 [7:0] S, Bits[15:8]
0x0624 [7:0] S, Bits[23:16]
0x0625 [7:6] Unused
[5:0] S 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.