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.
0
–25
–50
–75
–100
–125
–150
–175
0 50k 100k 156.249k
AMPLITUDE (dB)
FREQUENCY (Hz)
06518-006
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