Datasheet

AD7765
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) generated from
8,192 samples.
0
–25
–50
–75
–100
–125
–150
–175
0 25k 50k 75k
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-007
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
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-008
Figure 7. Normal Power Mode; FFT, 1 kHz, −0.5 dB Input Tone,
256× Decimation Rate
0 50k 75k25k
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-201
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
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-211
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
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-210
–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 75k25k
AMPLITUDE (dB)
FREQUENCY (Hz)
06519-204
0
–25
–50
–75
–100
–125
–150
–175
Figure 11. Low Power Mode; FFT, 1 kHz, −6 dB Input Tone,
128× Decimation Rate