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AD9548 Datasheet(PDF) 89 Page - Analog Devices |
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AD9548 Datasheet(HTML) 89 Page - Analog Devices |
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89 / 111 page  Data Sheet AD9548 Table 104. Digital Loop Filter Coefficients—Profile 21 Address Bits Bit Name Description 0x0692 [7:0] Alpha-0 linear Alpha-0 coefficient linear, Bits[7:0] 0x0693 [7:0] Alpha-0 coefficient linear, Bits[15:8] 0x0694 [7:6] Alpha-2 exponent Alpha-2 coefficient exponent, Bits[1:0] [5:0] Alpha-1 exponent Alpha-1 coefficient exponent, Bits[5:0] 0x0695 [7:1] Beta-0 linear Beta-0 coefficient linear, Bits[6:0] [0] Alpha-2 exponent Alpha-2 coefficient exponent, Bit 2 0x0696 [7:0] Beta 0-linear Beta-0 coefficient linear, Bits[14:7] 0x0697 [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] 0x0698 [7:0] Gamma-0 linear Gamma-0 coefficient linear, Bits[7:0] 0x0699 [7:0] Gamma-0 coefficient linear, Bits[15:8] 0x069A [7:6] Unused [5:1] Gamma-1 exponent Gamma-1 coefficient exponent, Bits[4:0] [0] Gamma-0 linear Gamma-0 coefficient linear, Bit 6 0x069B [7:0] Delta-0 linear Delta-0 coefficient linear, Bits[7:0] 0x069C [7] Delta-1 exponent Delta-1 coefficient exponent, Bit 0 [6:0] Delta-0 linear Delta-0 coefficient linear, Bits[14:8] 0x069D [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 105. R-Divider—Profile 21 Address Bits Bit Name Description 0x069E [7:0] R R, Bits[7:0] 0x069F [7:0] R, Bits[15:8] 0x06A0 [7:0] R, Bits[23:16] 0x06A1 [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 106. S-Divider—Profile 21 Address Bits Bit Name Description 0x06A2 [7:0] S S, Bits[7:0] 0x06A3 [7:0] S, Bits[15:8] 0x06A4 [7:0] S, Bits[23:16] 0x06A5 [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. Table 107. Fractional Feedback Divider—Profile 2 Address Bits Bit Name Description 0x06A6 [7:0] V V, Bits[7:0] 0x06A7 [7:4] U U, Bits[3:0] [3:2] Unused [1:0] V V, Bits[9:8] 0x06A8 [7:6] Unused [5:0] U U, Bits[9:4] Rev. G | Page 89 of 111 |
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