JAJSCY4D December 2016 – December 2023 DAC38RF80 , DAC38RF83 , DAC38RF84 , DAC38RF85 , DAC38RF90 , DAC38RF93
PRODUCTION DATA
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The digital upconverter first increases the sample rate of the IQ signal from the input sample rate to the final DAC sample rate through a series of interpolation filters. Different sets of filters are used to achieve different rates, as shown in Table 7-34. The interpolation rate is selected by field INTERP in register MULTIDUC_CFG1 (7.5.13).
FILTERS USED | |||||||
---|---|---|---|---|---|---|---|
Interpolation Rate | FIR0 (2x) | FIR1 (2x) | LPFIR0_5X | FIR2 (2x) | LPFIR0_3X | FIR3 (2x) | LPFIR1_3X |
6 | x | x | |||||
8 | x | x | x | ||||
10 | x | x | |||||
12 | x | x | x | ||||
16 | x | x | x | x | |||
18 | x | x | x | ||||
20 | x | x | x | ||||
24 | x | x | x | x |
The FIR filter coefficients are shown in Table 7-35 The FIR filters are design with a passband BW of 0.4 x fINPUT, a stopband attenuation of 90 dBc and ripple of < 0.001 dB. The composite frequency response for each interpolation factor are shown in Figure 7-14 to Figure 7-21.
tap | FIR0 | FIR1 | LPFIR0_5X | FIR2 | LPFIR0_3X | FIR3 | LPFIR1_3X | INVSINC |
---|---|---|---|---|---|---|---|---|
1 | 6 | -12 | -6 | 29 | -14 | 3 | 25 | 1 |
2 | 0 | 0 | -22 | 0 | -61 | 0 | 88 | -4 |
3 | -19 | 84 | -51 | -214 | -125 | -25 | 22 | 13 |
4 | 0 | 0 | -89 | 0 | -95 | 0 | -576 | -50 |
5 | 47 | -336 | -117 | 1209 | 181 | 150 | -1764 | 592 |
6 | 0 | 0 | -106 | 2048 | 681 | 256 | -2263 | -50 |
7 | -100 | 1006 | -18 | 1209 | 972 | 150 | 491 | 13 |
8 | 0 | 0 | 171 | 0 | 347 | 0 | 8139 | -4 |
9 | 192 | -2691 | 449 | -214 | -1475 | -25 | 18625 | 1 |
10 | 0 | 0 | 745 | 0 | -3519 | 0 | 26365 | |
11 | -342 | 10141 | 930 | 29 | -3528 | 3 | 26365 | |
12 | 0 | 16384 | 841 | 707 | 18625 | |||
13 | 572 | 10141 | 338 | 9337 | 8139 | |||
14 | 0 | 0 | -618 | 19445 | 491 | |||
15 | -914 | -2691 | -1892 | 26299 | -2263 | |||
16 | 0 | 0 | -3147 | 26299 | -1764 | |||
17 | 1409 | 1006 | -3872 | 19445 | -576 | |||
18 | 0 | 0 | -3500 | 9337 | 22 | |||
19 | -2119 | -336 | -1564 | 707 | 88 | |||
20 | 0 | 0 | 2121 | -3528 | 25 | |||
21 | 3152 | 84 | 7336 | -3519 | ||||
22 | 0 | 0 | 13430 | -1475 | ||||
23 | -4729 | -12 | 19426 | 347 | ||||
24 | 0 | 24231 | 972 | |||||
25 | 7420 | 26904 | 681 | |||||
26 | 0 | 26904 | 181 | |||||
27 | -13334 | 24231 | -95 | |||||
28 | 0 | 19426 | -125 | |||||
29 | 41527 | 13430 | -61 | |||||
30 | 65536 | 7336 | -14 | |||||
31 | 41527 | 2121 | ||||||
32 | 0 | -1564 | ||||||
33 | -13334 | -3500 | ||||||
34 | 0 | -3872 | ||||||
35 | 7420 | -3147 | ||||||
36 | 0 | -1892 | ||||||
37 | -4729 | -618 | ||||||
38 | 0 | 338 | ||||||
39 | 3152 | 841 | ||||||
40 | 0 | 930 | ||||||
41 | -2119 | 745 | ||||||
42 | 0 | 449 | ||||||
43 | 1409 | 171 | ||||||
44 | 0 | -18 | ||||||
45 | -914 | -106 | ||||||
46 | 0 | -117 | ||||||
47 | 572 | -89 | ||||||
48 | 0 | -51 | ||||||
49 | -342 | -22 | ||||||
50 | 0 | -6 | ||||||
51 | 192 | |||||||
52 | 0 | |||||||
53 | -100 | |||||||
54 | 0 | |||||||
55 | 47 | |||||||
56 | 0 | |||||||
57 | -19 | |||||||
58 | 0 | |||||||
59 | 6 |