DAC5687IPZP datasheet(59/72 Pages) TI

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(a) Complex Output in X4 and X4L Modes

(b) Real Output in X4 and X4L Modes

fSIG/fDAC

−0.5

−0.4

−0.3

−0.2

−0.1

0.0

0.1

0.2

0.3

0.4

0.5

0.0

0.1

0.2

0.3

0.4

0.5

G028

fSIG − fDAC*3/4

fSIG − fDAC/2

fSIG − fDAC/4

fSIG + fDAC/4

fSIG

fSIG/fDAC

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

0.0

0.1

0.2

0.3

0.4

0.5

G029

fSIG + fDAC/4

fSIG − fDAC*3/4

fSIG − fDAC/4

fSIG

fSIG − fDAC/2

(a) Complex Output in X8 Mode

(b) Real Output in X8 Mode

fSIG/fDAC

−0.5

−0.4

−0.3

−0.2

−0.1

−0.0

0.1

0.2

0.3

0.4

0.5

0.0

0.1

0.2

0.3

0.4

0.5

G030

fSIG + fDAC/4

fSIG − fDAC*3/4

fSIG − fDAC/4

fSIG − fDAC/2

fSIG − fDAC*7/8

fSIG

fSIG − fDAC/8

fSIG + fDAC/8

fSIG/fDAC

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

0.0

0.1

0.2

0.3

0.4

0.5

G031

fSIG − fDAC/4

fSIG − fDAC*7/8

fSIG − fDAC/2

fSIG + fDAC/4

fSIG + fDAC/8

fSIG

fSIG − fDAC/8

fSIG − fDAC*3/4

Amplitude of the Spurious Signals

DAC5687

SLWS164B – FEBRUARY 2005 – REVISED JUNE 2005

Figure 68. Frequency of Clock Mixing Spurious Images in X4 and X4L Modes

Figure 69 shows the location of spurious signals for X8 mode as a function of fSIG/fDAC. The addition of the fDAC/8

clock frequency for the first interpolation filter creates four new spurious signals. For a complex output, the

nearest spurious signals are fDAC/8 offset from fSIG. For a real output, the optimum real output frequencies fSIG =

fDAC x N/16 (N = 3 and 5), where the minimum spurious product offset from fSIG is fDAC/8.

Figure 69. Frequency of Clock Mixing Spurious Images in X4 and X4L Modes

The spurious signal amplitude is sensitive to factors such as temperature, voltage, and process. Typical worst

case estimates to account for the variation over these factors are provided below as design guidelines.

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