AD7765_07 Datasheet, PDF (11/32 Pages) Analog Devices – 24-Bit, 156 kSPS, 112 dB Σ-Δ ADC with On-Chip Buffers and Serial Interface

AD7765
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD1 = DVDD = VDRIVE = 2.5 V, AVDD2 = AVDD3 = AVDD4 = 5 V, VREF+ = 4.096 V, MCLK amplitude = 5 V, TA = 25°C. Linearity plots are
measured to 16-bit accuracy. The input signal is reduced to avoid modulator overload and digital clipping. Fast Fourier transforms (FTTs)
of −0.5 dB tones are generated from 262,144 samples in normal power mode. All other FFTs are generated from 8,192 samples.
0
0
–25
–25
–50
–50
–75
–75
–100
–100
–125
–125
–150
–150
–175
0
20k
40k
60k
FREQUENCY (Hz)
78.124k
Figure 6. Normal Power Mode; FFT,1 kHz, −0.5 dB Input Tone,
128× Decimation Rate
0
–175
0
10k 20k 30k 40k 50k 60k 70k
FREQUENCY (Hz)
Figure 9. Low Power Mode; FFT,1 kHz, −0.5 dB Input Tone,
128× Decimation Rate
0
–25
–25
–50
–50
–75
–75
–100
–100
–125
–125
–150
–150
–175
0
10k
20k
30k
FREQUENCY (Hz)
39.062k
Figure 7. Normal Power Mode; FFT,1 kHz, −0.5 dB Input Tone,
256× Decimation Rate
0
–175
0
5k 10k 15k 20k 25k 30k 35k
FREQUENCY (Hz)
Figure 10. Low Power Mode; FFT,1 kHz, −0.5 dB Input Tone,
256× Decimation Rate
0
–25
–25
–50
–50
–75
–75
–100
–100
–125
–125
–150
–150
–175
0
25k
50k
75k
FREQUENCY (Hz)
Figure 8. Normal Power Mode; FFT,1 kHz, −6 dB Input Tone,
128× Decimation Rate
–175
0
25k
50k
75k
FREQUENCY (Hz)
Figure 11. Low Power Mode; FFT,1 kHz, − dB Input Tone,
128× Decimation Rate
Rev. 0 | Page 11 of 32