DAC5682Z datasheet(21/66 Pages) TI1

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DAC5682Z

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SLLS853F – AUGUST 2007 – REVISED JANUARY 2015

Table 1. FIR0 and FIR1 Digital Filter Taps

TAP NO.

COEFF

TAP NO.

COEFF

1, 47

–5

2, 46

3, 45

4, 44

5, 43

–42

6, 42

7, 41

8, 40

9, 39

–158

10, 38

11, 37

272

12, 36

13, 35

–444

14, 34

15, 33

704

16, 32

17, 31

–1106

18, 30

19, 29

1795

20, 28

21, 27

–3295

22, 26

23, 25

10368

—

16384

—

8.3.2 Coarse Mixers: CMIX0 and CMIX1

The DAC5682Z has two coarse mixer (CMIX) blocks: CMIX0 follows FIR0 and CMIX1 follows FIR1. (See

Figure 27) Each CMIX block provides mixing capability of fixed frequencies Fs/2 (real) or ±Fs/4 (complex) with

respect to the output frequency of the preceding FIR block. Because FIR0 and CMIX0 are only used in x4

interpolation modes, the output is half-rate relative to the DAC output frequency. Therefore, an ±Fs/4 mixing

sequence results in ±FDAC/8 frequency shift at the DAC output.

Table 2. CMIX0 Mixer Sequences

Mode

CMIX0_mode(1)

CMIX0_mode(0)

MIXING SEQUENCE

Normal

FIR0A = { +A, +A , +A, +A }

(Low Pass, No Mixing)

FIR0B = { +B, +B , +B, +B }

High Pass

FIR0A = { +A, –A , +A, –A }

FIR0B = { +B, –B , +B, –B }

+FDAC /8 (+Fs/4)

FIR0A = { +A, –B , –A, +B }

FIR0B = { +B, +A , –B, –A }

–FDAC /8 (–Fs/4)

FIR0A = { +A, +B , –A, –B }

FIR0B = { +B, –A , –B, +A }

Table 3. CMIX1 Mixer Sequences

Mode

CMIX1_mode(1)

CMIX1_mode(0)

MIXING SEQUENCE

Normal

DACA = { +A, +A , +A, +A }

(Low Pass, No Mixing)

DACB = { +B, +B , +B, +B }

High Pass (Fs/2)

DACA = { +A, –A , +A, –A }

DACB = { +B, –B , +B, –B }

+FDAC /4

DACA = { +A, –B , –A, +B }

DACB = { +B, +A , –B, –A }

–FDAC /4

DACA = { +A, +B , –A, –B }

DACB = { +B, –A , –B, +A }

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