8.2.1.3 Application Curves

Figure 8-2 shows the THD+N plot vs frequency of the buffer output using a 20-Hz to 20-kHz sine wave sweep

with a DAC code range of 0x81FF ± 0x7E00 to prevent voltage clipping. A 40-kHz low-pass filter is also used in

the measurement tool.

Frequency (Hz)

-95

-90

-85

-80

-75

-70

-65

20

100

1k

10k

20k

20-Hz to 20-kHz sine wave sweep with a code range of 0x81FF ± 0x7E00

40-kHz low-pass filter

Figure 8-2. THD+N vs Frequency

Figure 8-3 shows the FFT of the buffer output using a 1-kHz sine wave with a code range of 0x81FF ± 0x7E00 to

prevent voltage clipping. 32768 bins, 8 averages, and a 40-kHz low-pass filter are also used in the measurement

tool.

Frequency (Hz)

10

100

1000

10000

40000

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

1-kHz sine wave with a code range of 0x81FF ± 0x7E00

32768 bins, 8 averages, 40-kHz low-pass filter

Figure 8-3. FFT Amplitude vs Frequency

DAC82002

SBASAK1A – AUGUST 2022 – REVISED DECEMBER 2022

www.ti.com

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