Datasheet

AD7764
Rev. A | Page 11 of 32
TYPICAL PERFORMANCE CHARACTERISTICS
AV
DD
1 = DV
DD
= 2.5 V, AV
DD
2 = AV
DD
3 = AV
DD
4 = 5 V, V
REF
+ = 4.096 V, MCLK amplitude = 5 V, T
A
= 25°C. Linearity plots measured to
16-bit accuracy. Input signal reduced to avoid modulator overload and digital clipping; fast Fourier transforms (FFTs) of 0.5 dB tones are
generated from 262,144 samples in normal power mode. All other FFTs are generated from 8192 samples.
Figure 6. Normal Power Mode, FFT,1 kHz, 0.5 dB Input Tone,
64× Decimation Rate
0
–25
–50
–75
–100
–125
–150
–175
0 20k 40k 60k 78.124k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-007
Figure 7. 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 39.062k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-008
Figure 8. Normal Power Mode, FFT,1 kHz, −0.5 dB Input Tone,
256× Decimation Rate
0 150k125k100k75k50k25k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-212
0
–25
–50
–75
–100
–125
–150
–175
Figure 9. Low Power Mode, FFT,1 kHz, −0.5 dB Input Tone,
64× Decimation Rate
0 10k 20k 30k 40k 50k 60k 70k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-211
0
–25
–50
–75
–100
–125
–150
–175
Figure 10. Low Power Mode, FFT,1 kHz, −0.5 dB Input Tone,
128× Decimation Rate
0 5k 10k 15k 20k 25k 30k 35k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-210
0
–25
–50
–75
–100
–125
–150
–175
Figure 11. Low Power Mode, FFT,1 kHz, 0.5 dB Input Tone,
256× Decimation Rate