AD7765

Rev. A | Page 11 of 32

TYPICAL PERFORMANCE CHARACTERISTICS

to 16-bit accuracy; input signal reduced to avoid modulator overload and digital clipping; fast Fourier transforms (FFTs) generated from

8,192 samples.

0

–25

–50

–75

–100

–125

–150

–175

0

25k

50k

75k

FREQUENCY (Hz)

Figure 6. Normal Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,

128× Decimation Rate

0

–25

–50

–75

–100

–125

–150

–175

0

10k

20k

30k

FREQUENCY (Hz)

Figure 7. Normal Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,

256× Decimation Rate

0

50k

75k

25k

FREQUENCY (Hz)

0

–25

–50

–75

–100

–125

–150

–175

Figure 8. Normal Power Mode; FFT, 1 kHz, −6 dB Input Tone,

128× Decimation Rate

0

10k

20k

30k

40k

50k

60k

70k

FREQUENCY (Hz)

0

–25

–50

–75

–100

–125

–150

–175

Figure 9. Low Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,

128× Decimation Rate

0

5k

10k

15k

20k

25k

30k

35k

FREQUENCY (Hz)

–15

–35

–55

–75

–95

–115

–135

–155

–175

Figure 10. Low Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,

256× Decimation Rate

0

50k

75k

25k

FREQUENCY (Hz)

0

–25

–50

–75

–100

–125

–150

–175

Figure 11. Low Power Mode; FFT, 1 kHz, −6 dB Input Tone,

128× Decimation Rate