DAC39RF10 datasheet(103/232 Pages) TI2

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7.3.6.1 Digital Upconverter (DUC)

Each DUC interpolates the I and Q signals by factors ranging from LT = 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64,

96, 128, 192 and 256. The resulting up-converted baseband I/Q signal is then multiplied by a complex sinusoid

generated by the numerically controlled oscillator (NCO) to mix the signal to the desired carrier frequency for

output from the DAC. The interpolation factors supported vs the number of DUCs enabled is listed in Table 7-7.

Table 7-7. Supported Interpolation Factors vs Number of DUCs Enabled

Number of Streams (JESD_M)

Interpolation Factors Supported (LT)

DUCs Enabled

2-256x

DUC0

4-256x

DUC0, DUC1

8-256x

DUC0, DUC1, DUC2

8-256x

DUC0, DUC1, DUC2, DUC3

The NCOs and mixer can be bypassed, essentially setting the frequency and phase to 0, in which case the I

input passes to the I output and the Q input passes to the Q output.

7.3.6.1.1 Interpolation Filters

The first operation of the DUC is to interpolate the input signal to a higher data rate. The available

interpolation options are summarized in Table 7-8. The sampling rate of the input signal is multiplied by the

specified interpolation amount to determine the DAC output rate, subject to the maximum sample rate for the

DAC39RF10-Sx and 'RFS10-Sx. These rates do not include the optional 2x interpolation for DES mode. For

interpolations rates 6x and below, a reduced number of DUC channels are available.

Table 7-8. Summary of Interpolation Options

INTERPOLATION

Maximum Number of DUC channels

12x

16x

24x

32x

48x

64x

96x

128x

192x

256x

Each DUC contains multiple 2x or 3x interpolating filters. The filter coefficients for each filter are listed in Table

7-9 and the filters used for each interpolation factor are shown in Table 7-10. The interpolation filter composite

responses are given in Figure 7-14 to Figure 7-42. The filters are designed to provide a passband bandwidth of

80% on the input bandwidth and passband ripple less than 0.01 dB. The stopband attenuation is greater than 90

dB for any signal within the passband.

Table 7-9. Interpolation Filter Coefficients

Filter

Coefficients (Center Tap in Bold)

fir1

[6 0 -19 0 47 0 -100 0 192 0 -342 0 572 0 -914 0 1409 0 -2119 0 3152 0 -4729 0 7420 0 -13334 0 41527 65536 41527 0

-13334 0 7420 0 -4729 0 3152 0 -2119 0 1409 0 -914 0 572 0 -342 0 192 0 -100 0 47 0 -19 0 6 ]*2-16

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DAC39RF10-SP, DAC39RF10-SEP

DAC39RFS10-SP, DAC39RFS10-SEP

SBAS932A – MARCH 2024 – REVISED FEBRUARY 2026

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