Datasheet

AD9547 Data Sheet
Rev. E | Page 80 of 104
Table 84. Digital Loop Filter Coefficients—Profile 0
1
Address Bit 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].
0x0617
7
Unused
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 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 the Digital Filter
Coefficients section for details.
Register 0x061E to Register 0x0628—Profile 0 Frequency Multiplication
Table 85. R Divider—Profile 0
1
Address Bit 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
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
Bit
Bit Name
Description
0x0622
[7:0]
S
S, Bits[7:0].
0x0623
[7:0]
S
S, Bits[15:8].
0x0624 [7:4] Unused Unused.
[3:0]
S
S, Bits[19:16].
0x0625 [7:0] Unused Unused.
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.