DAC39J84IAAVR datasheet(46/146 Pages) TI

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Small

Fractional

Delay FIR

Large

Fractional

Delay FIR

Ain

Matched

Delay Line

Large

Fractional

Delay FIR

Bin

Bout

mem_sfrac_sel_ab

mem_lfrac_sel_ab

mem_lfrac_ena_ab

mem_sfrac_ena_ab

Small

Fractional

Delay FIR

Large

Fractional

Delay FIR

Cin

Cout

Matched

Delay Line

Large

Fractional

Delay FIR

Din

Dout

mem_sfrac_sel_ab

mem_lfrac_sel_ab

mem_lfrac_ena_ab

mem_sfrac_ena_ab

Aout

Integer

Delay

mem_output_delayab

mem_output_delaycd

Integer

Delay

Integer

Delay

Integer

Delay

mem_output_delaycd

DAC39J84

SLASE48A – NOVEMBER 2014 – REVISED JANUARY 2015

www.ti.com

Figure 73. Diagram of Group Delay Correction

7.3.16.1 Fine Fractional Delay FIR Filter

The coefficients of the FIR filters for small fractional delay are programmable to user defined values which allows

users to implement their own filter transfer functions. Filter designs supporting group delay variation in the range

[0.002 0.198]×Tdac, where T is the time period of DAC Clock, is listed in Table 16. The bit widths of all

coefficients are fixed, which puts limits on the range of values each coefficient can acquire.

Table 15. Small Fractional Delay FIR Coefficient Range

COEFFICIENT

RANGE

[–2,1]

[–16,15]

[–128,127]

[–512,511]

[–262144,262143]

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